(1) Drinking water treatment
The pre-oxidation of drinking water by hydrogen peroxide is an effective and economical method to replace chlorination. It does not produce organochlorine and can significantly remove the low molecular weight dissolved organic matter in the water, thus reducing the organochlorine produced in the process of disinfection. At the same time, hydrogen peroxide can significantly inhibit the growth of algae. The removal efficiency of organic matter by hydrogen peroxide preoxidation system is higher than that by conventional precipitation process, and the organic matter removed is mainly dissolved organic matter. The experiments on the removal of algae, organic matter and turbidity in water by hydrogen peroxide pre-oxidation show that adding appropriate amount of hydrogen peroxide can significantly improve the turbidity, algae and organic matter removal rate. When the dosage of hydrogen peroxide was 4mg/L, the removal rate of algae was 84.2%. In the bactericidal aspect, the dose of hydrogen peroxide to general bacteria and bactericidal potency is 3 ~ 10mg/L.
(2) Circulating cooling water treatment
Hydrogen PEROXIDE is used to treat industrial cooling water, which can improve the taste of water quality, eliminate unpleasant odor and reduce color, and its decomposed products do not pollute the environment, are easy to be discharged in situ, and do not react with ammonia in circulating water.
(3) three waste treatment
Hydrogen peroxide treatment of wastewater mainly depends on the decomposition of hydrogen peroxide to produce free hydroxyl group with strong oxidation capacity. The commonly used H2O2-Fenton system (known as Fenton reagent) has been widely used as a treatment agent, while hydrogen peroxide is often used in combination with other methods (such as ozonation, ultraviolet irradiation, etc.) to enhance the treatment effect and treat those pollutants that are difficult to decompose. Sulfides, cyanides and phenols are commonly treated with hydrogen peroxide. When H2O2 is used to treat the waste gas containing SO2 and H2S, sulfuric acid can be generated and waste can be turned into treasure. The effect of hydrogen peroxide on phenol, cresol, chlorophenol and other phenols is excellent. In the presence of FeSO4 catalyst and pH 3 ~ 6 at room temperature, hydrogen peroxide can rapidly destroy the structure of phenol. In the process of oxidation, the benzene ring is first split into two free acids, and finally CO2 and H2O are formed. Hydrogen peroxide can also be used to decolorize the wastewater discharged from printing and dyeing factories and dye production plants.
In the paper industry, H2O2 bleaching is used instead of chlorine bleaching (Cl2 and NaCIO are used as bleaching agents), which can avoid the production and emission of harmful pollutants, organic chlorides, which are highly toxic, even carcinogenic, and seriously pollute the environment. Textiles, knitwear and other early use of chlorine bleaching, emissions pollution environment, and after bleaching products for a long time easy yellowing. At home and abroad, H2O2 bleaching has been basically used to eliminate chlorine pollution, improve the environment, improve product quality, and because of the easy cleaning after bleaching, can reduce water use, save plant and land.