Circulating water status and progress biocides description - circulating water, cooling water - water industries

Cooling water generally refers to bacteria and microbial algae

. In fresh water, bacteria and algae are less. However, the water cycle, as nutrient enrichment enrichment, increased water temperature and light, bacteria and algae to multiply rapidly to create the conditions caused by the production of a large number of hazards, thus cooling water Biocides Research is of great significance. 1 oxidizing biocide 1.1 chlorine In the treatment process, chlorine gas because of its high efficiency, broad-spectrum, low-cost, source wide and easy to use than by people of all ages, is the largest amount of Antiseptic . But after chlorine treatment in water is easy to produce chloroform carcinogen, while its long half-life, easy on Environment Harm, so countries have issued laws and regulations, increasingly strict control of chlorine emissions. In addition, the chlorine in the high pH (> 8.5) under the conditions of the shortcomings of bactericidal activity than that shown, so people developed an alternative to chlorine, such as ClO2, brominated killing agent. 1.2 Chlorine dioxide Killing ability of chlorine dioxide stronger than chlorine, chlorine is about 2.5 times, especially for ammonia plant alternative to chlorine for disinfection of processing. Abroad in the mid 70s of last century will be applied to cooling water. However, the performance of instability, not transport, limiting their wider application. People use this site for the occurrence and development of stabilized chlorine dioxide ClO2 measures to overcome this problem. 1.3 bromine bactericide Bromine chlorine bactericide fungicide can make up the main drawback, HOBr than HOCl faster sterilization, and applicable to a wide range of pH, especially for alkalinity; bromide and bactericidal action of HOCl rather, it can be used by the system NH3 pollution in, and bromide compounds easily degradable than the chloramines are unlikely to cause secondary pollution; Br2 Cl2 less volatile than the sterilization can be reduced when the dosage; Br2 than Cl2 on the corrosion of copper and copper alloy smaller. But the high price of Br2 than Cl2. 2 non-oxidizing bactericide 2.1 isothiazolone ketone Has a broad spectrum of bactericidal properties, while the role of sticky mud with stripping. Effective at low concentrations, generally the effective concentration of 0.5mg / L, will be able to better control the growth of bacteria. Compatibility is good, with Inhibitor , Scale inhibition and dispersion agents and most of the anionic, cationic and non-ionic surfactant compatibility. Environmentally friendly, the pharmaceutical fast degradation in aqueous solution. PH value on the wide range of applications, generally from 5.5 to 9.5 pH value can apply. Both dosing interval for a long time could not afford the advantages of foam. The late 80s of last century China has developed a similar number of units of similar products abroad, and put into production. In the increasingly wide application of cooling water. 2.2 glutaraldehyde glutaraldehyde Almost non-toxic, wide scope of application, resistance to high temperature, is the cure for sulfate-reducing bacteria killing, which itself is biodegradable. The disadvantage is that with ammonia, amines react and lose activity, and therefore a serious leakage of ammonia fertilizer plant should not be used. 2.3 Quaternary It has broad-spectrum, high performance, bacteria and algae in the sludge also has a peeling effect. Early Quaternary Ammonium lauryl dimethyl benzyl ammonium chloride (1227) as representative of the widely used domestic and Bromogeramine benzalkonium belong to such products. As technology advances, the inadequacy of such quaternary ammonium salts are gradually revealed. Mainly in the pharmaceutical short duration, bacterial resistance and its easy to use foam and more difficult to eliminate such shortcomings. To overcome these shortcomings, the foreign representative has developed a new variety of quaternary ammonium, such as double-alkyl ammonium salt, ammonium salt, quaternary ammonium such as polyethylene.

Circulating water status and progress biocides description - circulating water, cooling water - water industries

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