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2015 water treatment agent biocide market sales or peaked. Sterilization is the use of biological principles (cut protein connection, closed suffocation ... ...) to kill the algae, fungi in order to eliminate the aim of the current circulating water system prone to bacteria and algae problems, but also a lot of the needs of the seed quality and efficient sterilization. Sterilization is complex contains a variety of drugs fungicidal compounds. Has a broad spectrum, PH value and adapt to a wide variety of pharmaceutical good compatibility, no residue in the water, pollution, etc., long-term use of non-resistance, a variety of bacteria and algae have an excellent role in the killing. Biocide for industrial water, drinking water, swimming pools, cutlery and other aspects of sterilization and deodorization. Replace the liquid sodium chlorate generator and non-oxidizing biocide ideal product. Sterilization ACTION: Biocide in the hydrolysis of water to have a strong oxidizing isocyanurate and hypochlorous acid, the microbial oxidation enzymes in the body, with a strong penetration. Isocyanurate further decomposed into carbon dioxide and ammonia; hypochlorous acid and bromide ions react key activity hypobromous and hypobromite ions, the ions have a stable hypochlorous acid, increasing the PH value of the use, removal and prevention of bio-sticky Mud role. Role in the killing; no need to use equipment, direct dosing of chlorine dioxide dosing to avoid the trouble must be activated, and reduces the risk of the use of isothiazolin-one and when chlorine.
[Abstract] Thermal power plant cooling water system of two common fungicides - quaternary ammonium salt and isothiazolin-ketone were studied, drawn dosage, duration of action and the killed, and made fungicides Select the principles and considerations. Studies have shown that complex fungicide and bactericidal effect of medication province. Circulating cooling water;; sterilization; fungi; sterilization rate [keyword] Power Plant Water temperature Power Plant Cooling Water System perennial at 25 ℃ ~ 40 ℃, added water stabilizer addition of phosphine agent, very conducive to microbial growth and reproduction. Microbial growth cause the device to generate biofouling wall - slime, slime will not only decrease the efficiency of the heat exchanger, may cause the device to plug, even pitting, perforation, shutdowns. Therefore, we must control the circulating water system in microbial growth and reproduction, the paper bactericidal properties of thermal power plant circulating water two common fungicides were studied, and make recommendations. A quaternary ammonium bactericidal properties Quaternary ammonium fungicide is a nitrogen-containing organic compound, a non-oxidizing biocides, soluble in water, chemically stable, are cationic surfactants. It has both hydrophobic alkyl group, there are hydrophilic quaternary ammonium ion, so both as a solution to reduce the surface tension of the cationic surfactant, it is a good fungicide, is also a good dirt mud stripping agent. Currently thermal power plant cooling water system is the most commonly used fungicides quaternary ammonium lauryl dimethyl benzyl ammonium chloride (benzalkonium chloride), dodecyl dimethyl benzyl ammonium bromide (benzalkonium bromide) Wait. Choose a certain quaternary ammonium salts, change the dosage, to study it in the sterilization effects of different time periods. Test water is enriched A power plant after the actual recycled water, heterotrophic bacteria content 2.7 × 104 个 / mL. Test the following conclusions: (1) Such quaternary ammonium salt concentration is less than 50mg / L, the role of (2 ~ 8) h to kill bacteria better, for 24h to kill poor; concentrations greater than 70mg / L, the role of 24h sterilization rate 99.68%. (2) quaternary ammonium germicides faster reaction time (2h bactericidal effect is very obvious), but as time goes on, slowly lost its bactericidal effect (24h, the dosage of less than 50mg / L of water sample different aerobic bacteria count has reached the initial state). (3) for once-through cooling water systems, requiring a small amount of fungicide dosage, duration of action soon, quaternary ammonium germicides exactly meet the requirements. (4) Although the quaternary ammonium salt of bactericidal same trend, but the exact dosage due to the choice of different types of change agents. 2 isothiazolin-one bactericidal properties Isothiazolin-one is also a non-oxidative biocide, with high efficiency, broad-spectrum, low toxicity, environmental pollution characteristics, is an ideal water treatment agent. Isothiazolin-one of heterotrophic bacteria, fungi and algae and so has a better inhibitory effect, which contains fungicidal compounds can quickly degrade into non-toxic acetic acid, it will not cause harm to the environment. In the laboratory preparation of specific concentration isothiazolin-one fungicide sterilizing tests. Test water is enriched after the actual cycle power plant A water content of heterotrophic bacteria 2.7 × 104 个 / mL. From the test results can be seen, although isothiazolin-one in a short time (24h within) is better than a quaternary ammonium salt to kill bacteria, but after 8h bactericidal effect gradually increased to 24h its bactericidal effect is far better than the quaternary ammonium salt (at 30mg When / L, sterilization rate of 99.07%). 3 complex bactericidal properties Fungicides single component has dosing volume, single kill bacteria sterilization effect is poor, easy to produce drug resistance shortcomings. If two fungicides have a synergistic effect by a certain ratio can be complex, it will create synergies and complementary roles to overcome the weaknesses of single-component fungicide, but also reduce costs. Thus, complex fungicide has become a trend in recent years. The quaternary ammonium salt and isothiazolin-ketone compound, on the one hand can cause mutual synergies, so dosing agent concentration decreased; on the other hand can also learn from each other, increasing the broad-spectrum fungicide, and prevent anti-microbial herbal production. After 10mg / L of a quaternary ammonium salt and 10mg / L isothiazolin-one (a specific concentration) of the two agents complex, it can make up for lack of quaternary ammonium germicides aging at lower dose, thereby enhancing agents results. Complex chemical sterilization is better than a single dose. 4 fungicide choice Currently on the market a wide range of fungicides. Select fungicide must be considered: (1) has a broad spectrum, can effectively control who processing system of bacteria, fungi and algae; (2) easy to decompose itself or biodegradable. Many plants in the use of fungicides blind choice, no sterilization effect monitored, only dosing according to dosage fungicide manufacturing plant to provide, resulting in unnecessary waste and environmental pollution, and the effect may not be good. Therefore it recommends that the plant in the use of fungicides, should be based on the factory circulating water quality static sterilization test to determine the bactericidal effect of fungicides, the best dosage, dosing intervals, so as to enhance the sterilization effect, to save operating costs. 5 Recommended (1) rational use of water treatment agent solution. A good microbial control programs often used in combination with physical methods, such as cooling water system slime stripping and cleaning after delivery fungicides, such measures than without peeling cleansing programs only add much more effective fungicides. (2) The microbicides should not be added to the circulating water scale inhibitor, corrosion inhibitor react. (3) the effective control of microorganisms should be based on prevention, it is necessary to periodically microorganisms such as heterotrophic bacteria, fungi and slime amount for testing. (4) should be used fungicide compound, and try to use with broad-spectrum, low toxicity, non-polluting, biodegradable green fungicides.
This technology uses physical beneficiation method by diatom content ≥92% of diatomite, by adding a surface treatment agent, modified into a variety of water treatment diatomite water treatment agent. This water treatment agent has a strong adsorption, flocculation and sedimentation to the bottom and will soon form a cake, get clean water can be recycled after sewage organic and inorganic adsorption, sediment and cake can be completely separated. This processing technology, small investment, small footprint, simple equipment, easy operation, low power consumption and cost, pollutant removal efficiency, adaptability and continuous processing capabilities, not only with comprehensive advantages of traditional craft, and to overcome the traditional lack of sewage treatment process, but also has sediment can be completely separated and recycled features.
Abstract: Three kinds of organophosphorus agents PBTCA (2- acid butane - 1, 2, 4 three-carboxylic acid) from water treatment chemicals in common, HEDP (hydroxyethylidene diphosphonic acid), ATMP (aminotrimethylene methyl phosphonate) and ClO2, ZnSO4 complex by orthogonal experiment to determine the best formula, and the use of ab initio quantum chemical calculations formulations, analyzes the relationship between molecular structure and corrosion performance results show that: P atomic net charge QP, charge density, the lowest unoccupied molecular orbital energy ELUMO corrosion rate with good correlation. At the same time, the calculation of the Fe and ClO2 highest occupied molecular orbital and the lowest unoccupied molecular orbital energy EHOMO energy E LUMO and both the difference between E, described the role of corrosion inhibitor confessed electronic trends and Fe is greater than the accepted trend in the electronics and the role of Fe and PBTCA, HEDP and ATMP chlorine dioxide oxidation resistant ability and the lowest unoccupied molecular orbital energy inhibitor dioxide chlorine can be the difference between the highest occupied molecular orbital (LUMOinhib HOMOC lO2 value) has a good correlation between experimental data also show that the inhibition mechanism is correct. Key words: chlorine dioxide; 2 - acid butane - 1, 2, 4 three-carboxylic acid; hydroxy diphosphonic acid; aminotrimethylene acid The structure of the organic inhibitors decisive influence on its corrosion performance using quantum chemical methods of corrosion inhibitor performance quantitative or semi-quantitative research has important theoretical and practical significance extensive since Vosta 1971 years with Since the study of molecular orbital approximation HMO organic inhibitors, quantum chemistry methods has become a research molecular structure and corrosion inhibitor effective means of property relationships, domestic and foreign scholars have studied a variety of relief with a variety of quantum chemistry methods the quantitative relationship between molecular structure and corrosion inhibition efficiency between agents, according to the characteristics of the charge distribution of the study the mechanism of corrosion inhibitors [13], and has been in containing N, S inhibitor research in quantum chemistry made active exploration [4], but the quantum chemistry P-containing organic corrosion inhibitors reported very rarely, and organic phosphorus-based corrosion inhibitors is an important application of more current. Therefore, to make it theoretical aspects of exploration is a meaningful work. This paper studies the molecular and atomic PBTCA level, inhibition mechanism HEDP, ATMP, in order to evaluate the performance of the organic phosphine corrosion inhibitors and further development of new low-phosphorus or phosphorus green corrosion inhibitors provide theoretical information. Currently a particularly effective scale inhibitors are non-stoichiometric scale and corrosion inhibitor. The scale inhibitors in itself is only a fraction of the solution concentration of calcium ion concentration in the case of a few percent or even lower, it can achieve significant scale effect. In contrast, naturally occurring phosphate ions and magnesium, zinc, plasma calcite crystal growth inhibition, the effect directly proportional to the concentration [2]. For a long time, the effect of non-stoichiometric scale inhibitor, and a variety of theoretical models have been proposed, such as crystal nucleation suppression [3], the growth of the adsorption position [4], changes in surface charge [5] model. However, to verify the above theoretical model of experimental facts is still lacking, in particular the lack experiment image process can directly reflect the scale of the microstructure changes. 1 Inhibitor corrosion test Corrosion performance of 11 organophosphorus agents Standard test solution with water, the mixture C l O2 and corrosion inhibitors change PBTCA, HEDP, ATMP dosing concentration, study of inhibition effect of concentration. C l O2 dosing concentration of 70mg / L, at ( 400 10), p H value of 90, the rotation period is 72 h Experiments show that, HEDP for flaky scale diamond crystal has a very good effect; and for rhombohedral crystal growth inhibition is not ideal. Experimental samples were used in the experiments with calcium carbonate crystals supersaturated solution of artificial growth. Calcium carbonate from the supersaturated solution of calcium carbonate to the oxide dropwise prepared, the degree of supersaturation of about 3 to 4. Calcium carbonate seed crystal by the dropwise addition of an excess of a solution of calcium hydroxide into calcium carbonate precipitate formed spontaneously. The seed is introduced supersaturated calcium carbonate solution, incubated at a constant temperature water bath. Experimental temperature control (351). As a comparison with a cup solution which does not add any agent, another cup of HEDP in 05 h after the addition of about 2 10- 4 kg / m3. Once calcium carbonate crystals grow 12 h, removed by AFM observation. Using contact mode AFM experiments, the use of an atomic force microscope is the company's Digital Instruments Nano Scope a type. 2 Discussion (1) Optical microscopy, add HEDP HEDP grown with and without crystal morphology difficult to distinguish. The AFM can be obtained at the sub-micron scale calcium carbonate crystal clear images of 3D surface topography, which can greatly enhance the understanding of the inhibition mechanism. (2) Many AFM experiments to study the calcite cleavage plane in a supersaturated solution of calcium carbonate in step growth phenomenon. (3) AFM image showed that the addition of HEDP, rhombohedral crystal morphology of a fundamental change (Figure 4, 5) occurred. Figure 4 shows the appearance of a fine crystal structure, and Fig. 5 crystal planes are no longer flat, form a similar polycrystalline surface structure. It can be inferred HEDP can not stop the growth of this rhombohedral crystals; but HEDP greatly influenced the atomic arrangement of the surface of calcium carbonate crystals and surface energy, changed its original orderly growth. (4) In order to understand the changes in crystal growth after adding HEDP, also scanning the add HEDP about calcium carbonate crystals rhombohedral 1h after surface topography. (5) Sundara Rajam and Stephen Mann crystal morphology was studied by SEM element exists when there is Li (6) HEDP different results for different polymorphs scale also indirectly explains why the combination of different scale inhibitors have better scale effect, which also will provide important help with molecular modeling approach to design inhibitors. 3 Conclusion AFM technology gives the crystal growth process intuitive and clear physical image. The results can be inferred from the scale inhibitor in the crystal surface adsorption interrupted the normal growth process of the crystal, causing the crystal distortion even stop growing. The influence of different growth inhibitor for artificial crystal faces designed for different occasions inhibitor molecule is important.
Polyacrylamide and its role not only in the charge neutralization by leaving the flocculation of colloidal particles, but also with a load and dissolved substances react to form insoluble salts. As with having -SO3H, -SO4H and -H groups lignin sulfonic acid, agar action and anionic surfactants substances, and pectin, alginic acid and other carboxylic acid having -COOH group and so the role of substances and tannin with -OH groups, humic acid, lignin and other phenolic compounds thiosulfate. Therefore, polyacrylamide having turbidity or discoloration, and other functions, suitable for treating wastewater containing organic colloid more, such as dyeing, paper and pulp, food, aquatic products processing and other fermented industrial wastewater. In addition, it used as a washing machine and other oily wastewater and breaking generated. Performance comparison polyacrylamide and widely used Molecular weight polyacrylamide is usually lower than the anionic or nonionic organic flocculants. Within the scope of this low molecular weight, anionic or non-ionic polymer flocculating capacity has been weak, even not exhibit flocculation, but instead exhibits dispersion stability. Because flocculation mechanism cationic charge neutralization and adsorption bridging the dual role. Usually due to electrostatic interaction with the adsorption of polyacrylamide molecules and by electrical neutralization make electric double layer is compressed, thus shortening the distance between the particles of negatively charged particles. Thus, the molecular weight cationic flocculants even lower, it is very easy to bridge between the particles exhibit flocculation. But, after all, usually lower molecular weight polyacrylamide, which flocs of relatively poor performance. High molecular weight polyacrylamides may overcome this shortcoming. As industrial waste water flocculation and settling of suspended particles accelerators or as centrifugal dewatering machine dewatering sludge dewatering agent, oilfield "three high" efficient sewage treatment agent is being widely used. Polyacrylamide little use because of the high costs Linked to the size of the dispersed particles, the results clearly indicated, polyacrylamide flocculation treatment only for colloidal particles 0.1um or less, and flocculation anionic or nonionic polyacrylamide is applicable to more than 1um particle thickness of mix ʱ?? Polyacrylamide its same charge and performance polyacrylamide flocculant compared, because of its molecular chain with more adsorption active sites, so as a water treatment agent applications with better performance. However, the demand did not anionic and nonionic polyacrylamide large, practical application is using more of anionic and non-ionic polyacrylamide polymer flocculant polyacrylamide flocculant with inorganic type and use. The main reason is the high cost of polyacrylamide.
Abstract: The oxidative germicide TCCA in industrial circulating water system application, analyzes the dosing methods, the impact of chlorine dosing equipment for Man isocyanurate sterilization efficiency. The results showed that the use of i-chloro-isocyanurate, heterotrophic bacteria under control in 2.0xl04 / mL or less, heterotrophic bacteria sterilization rate 48 h up to 94-4%, within 72 h of heterotrophic bacteria, sulfate reducing the number of bacteria and iron bacteria are within the China Petrochemical Corporation circulating cooling water control targets of micro cow was: circulating water biological slime of an average of 0.6 mL / m ,, less than the control value of 3.0 mL / m. Water recycling equipment in order to reduce corrosion, residual value will be controlled at about 0.5 mg / L, using continuous dosing methods. Keywords: oxidative bactericide TCCA adhesion rate of corrosion rate In the industrial circulating water sterilization process. Oxidation fungicides commonly used liquid chlorine, sodium hypochlorite, chlorine isocyanuric acid and chlorine dioxide. TCCA as a white powder or bulk solid, irritating odor. Compared with other oxidizing biocides, TCCA stable, stockpiling and use of safe and convenient, and does not contain Ca, does not increase the water hardness, its simple dosing equipment, safe and strong. Since TCCA has advantages in terms of performance and safety. Therefore, increasing people's attention. A company China Petrochemical chemical plant industrial circulating water system used in the past chlorine disinfection. From August 2004 began to switch to i-chloro-isocyanurate as a fungicide. The work of TCCA bactericidal efficiency, stripping effect, select the dosing mode as well as the matching of water treatment agent were studied. 1 Application Test 1.1 Test program Scenario 1: The new third recycled water use intermittent dosing methods. The water circulating water field of 12 kt / h, the system water is 7 kt. Before the test cycle water chlorination system uses normal impact. TCCA test time was May 27, 2004 from 27 to 30 starting at 8:00 dosing, the TCCA into plastic bag. In the canal disposition three dosing points dosing. The timing of sampling and analysis of circulating water chlorine and bacteria, 3 days for a test period. At 8:00 on the 30th, analysts take complete after water samples. End of the trial. Before and after the test are all organic alkaline water treatment agent formulations. Scenario 2: The new second circulating water using continuous dosing methods. Test before circulating water system using normal chlorination impact. During the test, a single set solution kits, cited a pipe by dissolving medicine cabinet, the cabinet TCCA fully dissolved after adding the circulating water system. Set the meter before dissolving medicine chest, the purpose is to control the dosage, timing of dissolve into the medicine chest recharged. Before and after the test are all organic alkaline water treatment agent formulations. 1.2 Analysis and Quality Control Index Using China Petrochemical Corporation "cooling water analysis and test methods" water quality analysis. China Petrochemical Corporation circulating cooling water quality control indicators: The total number of heterotrophic bacteria ≤1xl05 / mL. Sulfate-reducing bacteria ≤50 months / mL Iron bacteria count ≤100 cells / mL Biological slime ≤3.0 mIJ / m3 Turbidity ≤10 mg / L (when there is next to the filter) Total iron ≤0.6 mg / L The corrosion rate ≤0.075 mm / a Adhesion rate ≤15 mg / (cm · IliOn1 Bactericidal effect of 1.3 TCCA During the test (May 27, 2004 --30 days) a chlorine isocyanurate bactericidal effect. After addition of TCCA. Heterotrophic bacteria sterilization rate 48 h up to 94.4%, 72 h sterilization rate reached 82.4 percent, bactericidal effect, maintaining a long time. Sterilization rate of SRB 72 h at 100%. Heterotrophic bacteria within 72 h, the number of sulfate reducing bacteria and iron bacteria in the China Petrochemical Corporation circulating cooling water inside the indicators of microbiological control. TCCA bactericidal strong force, because it is slow hydrolysis produces hypochlorous acid in water. Hypochlorous acid and nucleic acids, enzymes, oxidation reaction, thereby killing the pathogens. 2 Industrial Application 2.1 Comparison of heterotrophic bacteria Yanshan Petrochemical Company chemical plant starting from August 2004. Replace chlorine as a fungicide in the circulating water system with TCCA. The second new recycled water use chlorine and TCCA as a bactericide, heterotrophic bacteria in comparison. Chlorine usage time for the 2003 July 1 200I4年 March, TCCA usage time 2004 July 1 March 2005. TCCA after use. Heterotrophic bacteria under control in 2.0 × 104 cells / mL or less; the use of chlorine as a disinfectant, heterotrophic bacteria in the summer more than six. Oxl04 a / mL. Therefore, TCCA bactericidal effect is better than chlorine. TCCA bactericidal effect is better than chlorine. Because: (1) The effect of chlorine disinfection influenced by the environment, low water solubility of chlorine with intermittent dosing, unstable, volatile, water retention balance is difficult to achieve the standard. The TCCA solid little change in the dissolution process. In water continuous rate of release of a stable dose. Stabilizing continuous sterilization; (2) in the high temperature, direct sunlight, especially in summer easily decomposed floating chlorine loss. The TCCA has unique UV stable, sustainable play a bactericidal effect. 2.2 Chlorine change TCCA dosing methods are continuous and intermittent two kinds. Continuous dosing, residual value can be controlled at O. 2 ~ 1.0 mg / L; intermittent dosing, when the value of residual chlorine control in 0.5 ~ 2.0 mg / L, you can achieve better sterilization effect. TCCA chlorine in the water to see the trend, adding TCCA later. Within 8 h of chlorine released more slowly, 18 ~ 24 h peak. With time, within 36 h of residual chlorine can be maintained at about 0.1 mg / L. 40 h after losing sterilization. Trends and nature of chlorine TCCA relevant, TCCA bactericidal action to maintain a long time, because it has a unique UV stability. Most suitable for use in open recirculating cooling water systems. TCCA use can lower the pH of the cooling tower, so use TCCA do fungicides. Circulating water system consumption than drug use Relatively less liquid chlorine or sodium hypochlorite. Continuous dosing, TCCA value of residual chlorine control in 0.5 mg / L is ideal. How to maintain a stable value of residual chlorine in industrial applications need to be resolved, the dosage can lead to excessive corrosion of the heat exchanger, the dosage is too small and reach bactericidal effect. Therefore, the choice dosing approach is the key to stabilizing chlorine values. 2.3 Effect of TCCA bactericidal efficiency factor 2.3.1 dosing methods When in September 2004 using two different dosing methods, trends TCCA chlorine values. Continuous dosing, chlorine value of about 0.5 mg / L; and Intermittent dosing, the residual value of up to 2.4 mg / L, which would increase the heat exchanger Corrosion Using intermittent dosing methods. Residual value change big reason is because the steel dosing tank placed directly into the fast-flowing at the canal, in this situation, the flow rate flowing through the medicine cabinet can not control. The dissolution of TCCA influenced by changes in flow velocity, resulting in residual value peaked in the second day after dosing. And other times less residual value, residual value fluctuations. Using continuous dosing methods, uniform flow of water through the medicine cabinet was dissolved. By controlling the flow meter, good l chloride dissolved isocyanurate was added to the sump of the cooling tower or bypass tube. Basic residual value can be controlled at around 0.5 mg / L. In addition, the TCCA low solubility, can play a stabilizing sustained bactericidal effect. Seen. Continuous dosing is superior to intermittent dosing, can better control the amount of residual chlorine. 2.3.2 dosing equipment In addition to selecting the appropriate dosing methods. Dosing equipment residual value is the key to a uniform control. When using solid fungicide sterilized foreign agents supporting the use of stereotypes and dosing equipment. The equipment consists of the medicine chest, dosing tube, water mixers and weir plates and other components. By adjusting the weir plate height, the number of agents to control flooding, to control the dosage. There is no similar domestic stereotypes dosing equipment. It is normally provided by the user depending on the circumstances supporting self-designed dosing device. According to the amount of chlorine and experience to adjust the dosage.
When using cooling water constantly circulating and concentrated mineral content of the water will continue to increase, causing equipment pipeline scaling, corrosion presence of dirt will not only affect the heat transfer efficiency, but also produce corrosion under the scale. Therefore, the water cycle scale is very important. At present, the industrial cooling water treatment process, they use a method of adding chemicals to control the formation of dirt generally will be able to prevent or inhibit scale and dirt produce chemicals which are collectively known as deposit growth inhibitor . inhibitor in the industry there are two common forms of corrosion inhibitor and corrosion inhibitor DISPERSOR mainly has the following types: inorganic polyphosphates, organic polycarboxylic acid, gluconic acid and tannins etc. Currently circulating water system in the use of phosphorus-based formula, which is the most used organic polycarboxylic acid. DISPERSOR mainly medium and low molecular weight water-soluble polymers, including homopolymers and copolymers of two categories, including polyacrylic acid homopolymers and its sodium salt, HPMA, and other varieties are more copolymers, an acrylic and two dollars or terpolymer of maleic acid-based based. An organic polyol phosphate corrosion inhibitor The organic phosphate is a kind of cathodic corrosion inhibitor, which is a class of non-stoichiometric inhibitor, has significant threshold effects (ThresholdEffect). When they and other water treatment chemicals, it can exhibit good synergistic effect. They many metal ions (such as calcium, magnesium, copper, zinc, etc.) has excellent chelating ability, even inorganic salts of these metals such as calcium sulfate, calcium carbonate, magnesium silicate, also has a good deactivated effect, so widely used in water treatment. Currently continues to develop its species, it is a class of relatively advanced and promising agents. But a certain impact on the environment the presence of phosphorus. 1.1 methylene PHOSPHONOMETHYLAMINO Methylene phosphonate-type compounds are one of the earlier application in water treatment chemical agents. Because it can in the water and Ca2 +, Mg2 +, Zn2 +, Fe2 + and other metal ions to form a double five-membered ring chelate, so it has a more Good blocking calcium carbonate scale effect and carbon steel corrosion inhibition. are common amino trimethylene phosphonic acid (ATMP), ethylene diamine tetra methylene phosphonic acid (EDTMP), diethylenetriamine penta methylene phosphonic acid (DETPMP), hexamethylene diamine tetra methylene phosphonate (HDTMP), glycine dimethylene acid (GDMP), methylamine dimethylene acid (MADMP). 1.2 with carbon bisphosphonate type Diphosphonic acid with carbon compounds in common are 1-hydroxy-1,1-diphosphonic acid (HEDP) and 1-amino methylethylidene -1,1-12 diphosphonic acid (AEDP). Wherein HEDP early development and is one of the agent for water treatment. it can with metal ions to form a six-membered ring chelate, its oxidation resistance in methylene phosphonate compounds, in addition to calcium carbonate, but also on hydration iron and calcium phosphate scale has good inhibitory effect. US Bates developed hydroxypropylene diphosphate (HPDP) is abroad in the 1980s reported that the excellent performance of corrosion inhibitors, although the molecular structure the only increase over HEDP a methylene group, but the ability to control its Ca2 + ions is far more than HEDP, and can effectively prevent the cooling water to produce calcium carbonate, calcium phosphate and calcium sulfate scale, which is to improve the cooling water concentrate multiple is advantageous. Aishi Yun et conducted a systematic study of HPDP also proved HPDP is a kind of future development and application of both the scale and corrosion inhibition performance of effective water stabilizer.
Corrosion Inhibitor With the development of society and the advancement of technology has gone from inorganic to organic, from high-phosphorus, phosphorus to phosphate-free development history. As awareness of environmental protection has been strengthened research and development with more green non-toxic corrosion and scale has become the most important and most urgent task. Mainly because today hardly can really be called a green scale inhibitor product, but also the best polyfunctional organic phosphorus-based compound water treatment agent Bale. Based on years of market research and found that now more popular areas of two organophosphorus corrosion inhibitor and polymers. Although both scale inhibitors with high activity and low toxicity, but much more likely to cause secondary pollution, which had once reminded the necessity of research and development of more green non-toxic corrosion and scale inhibitors has. Overall, the future direction of green corrosion inhibitor is non-toxic, but their ability to own or not weakened.
Cooling tower cleaning can improve the performance of the cooling system, wash bacteria growth is the main reason for the cooling tower pollution. Cooling tower cleaning procedures shall include: Including disinfection, cleaning; Including all the wet surface cleaning; At least every six months to clean cooling tower again. Cleaning method step of cooling towers. The cleaning process can also be based on the actual situation. Step 1: In the chemical and mechanical cleaning and disinfection; Step 2: Chemical disinfection; Step 3: Clean the machinery; Step 4: mechanical cleaning. Cooling tower cleaning step 1 Step 1: chemical disinfection and mechanical cleaning workers provide the correct personal protective equipment (PPE), in order to protect their exposure to the cleaning or disinfecting chemicals and water, may contain Legionella. Tools include: full-length protective clothing, waterproof boots, impervious gloves, at least one second and chemical filter cartridge type breathing protection apparatus for high efficiency particulate air filter goggles, whole or half face mask combination of. Provide workers with suitable equipment to enable them to access the plant and safety (eg aerial work) safely. Ensure that all operations personnel are able to complete the task. Use the proper shutdown procedures. Cut off and isolated from the source of heat load (such as coolers, process plants). Shutdown and isolation cooling towers / evaporative condenser fan. Blow off system (purge) valve, turn off the automatic blow-off controller (if any), and set to manual system controller. The cooling water valve is open. Water circulation pump circulating water required by all areas of the cooling system (including the spare chillers, pumps, balance line and dead). Cooling tower cleaning step 2 Chemical disinfection, whether it is low foaming chlorine biologically compatible dispersants or low foaming bromine biological circulatory system compatible dispersants. Adding a chlorine-based compound (with detergent properties) to achieve a free residual chlorine (FRC) of at least 10 mg / l and kept at a level not less than 10 mg / L of water was continuously circulated through the system for one hour, water The pH was maintained at between FRC 7.0 and 7.6. FRC ?? and pH measurements every 15 minutes, and recorded in the tower cleaning service reports. Or Add bromine compounds (detergent properties), to achieve a surplus of bromine (FRB) of at least 20 mg / l. Then maintained at not less than 20 mg / L of water is continuously circulated through the system for an hour and keep the water at a pH between 7.0 and 8.5 FRB's. FRB and pH measurements every 15 minutes, and recorded in the cooling tower cleaning service reports. Pump cycle rate high let go, to remove suspended particles. Records for the type and quantity of all chemical disinfection plus FRC or measurements and results FRB and pH of time. Cooling tower cleaning Step 3 Mechanical cleaning: Shutdown and isolation of circulating water pump. If necessary, add a little water, sodium bisulfate. Sand, silt and scale inspection of all water contact area. Use a brush and water hose or high-pressure water cleaning machines thoroughly clean the drift eliminators and fan inlet screen. Cooling tower water cleaning contact area, including pots, sink, filling nozzles and accessories. If possible, the contact area clean chiller cooling towers / evaporative condensers inside. Cleanup from the pool and cooling tower basin loose deposits. Humid environment is easy to damage the bottom of the basin. Components and hoses reinstalled with clean water. If the work has moved to ensure proper replacement. Cooling tower cleaning step 4: Start the cooling tower and the circulating pump switch. Check the water is not clean, if not clean, repeat steps 2 and 3. Clean water filters and filter, then repeat steps 2, 3 and 4, until the water quality is satisfactory. Immediate resumption of a comprehensive and effective water treatment agent fungicide (S), corrosion and scale control. Operation and maintenance of all processes are recorded.
Cleaning pre-film composite from the main activity of phosphonate and the like together. The product with the cooling water calcium and magnesium ions complexed, the metal surface layer of the deposited film attached to the metal surface. This film makes corrosion resistance of big and medium metal and water isolation, and thus play a role in inhibiting corrosion. The product has a film speed, film quality uniform fine, good chemical stability, low corrosion rate and other characteristics. Use: can be used in chemical, fertilizer, oil refining, oil, metallurgy, power generation and other industrial water circulating cooling water systems in new device or system after maintenance equipment and piping for the hot pre-film, the metal surface to form a protective film, prevent corrosion of carbon steel, copper alloy, stainless steel and other materials at runtime. Usage: pre-film high dosing concentration is generally 300-500mg / L, added directly to the entrance to the sump pump. Pre-film time is 48-72 hours of cold and hot 24-48 hours. Total inorganic phosphorus discharged to less than 10 mg / L (in PO43 dollars). Packaging and storage: The product with plastic barrel, 25kg per barrel, or according to user needs. Storage cool indoor ventilation, storage for ten months.

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