With the rapid development of heavy industry, water pollution has become more and more serious, especially the textile industry. According to statistics in 2008, textile wastewater discharge accounted for 10.6% of the national wastewater discharge, and the discharge volume was 2.3 billion tons, ranking No. 1 in industrial discharge. The third place, COD emissions are 3.14 billion tons, ranking fourth in industrial emissions, accounting for 7.76% of the national industrial wastewater emissions. Printing and dyeing wastewater has always been the focus and difficulty of wastewater treatment technology research due to its large emissions and difficult treatment. . Polyacrylamide is a water-soluble linear polymer with good flocculation. It plays a pivotal role in the treatment of printing and dyeing wastewater. Printing and dyeing wastewater treatment polyacrylamide.
Printing and dyeing wastewater contains high organic matter content, large alkalinity, and large water quality changes. The wastewater contains dyes, additives, sizing agents, oils, acid and alkali, fiber impurities, sand substances, inorganic salts, and large amounts of printing and dyeing wastewater. It is industrial wastewater. It is one of the most difficult industrial waste water to be treated with large dischargers and complex composition. How to deal with the effect? Capitel Chemical tells you through a lot of experiments and facts.
According to the characteristics of printing and dyeing wastewater, the measures of reuse or comprehensive utilization of wastewater are generally adopted. In my country, the treatment of printing and dyeing wastewater mainly uses a combination of physical and chemical treatment and two-level special treatment. The physical and chemical treatment is mainly based on coagulation sedimentation and coagulation air flotation. Most of the biochemical treatment facilities that have been put into operation use The application of activated sludge method and SBR process is gradually increasing. Below we mainly introduce the coagulation pretreatment process and subsequent biochemical treatment process. Printing and dyeing wastewater treatment process.
The coagulation method is to add a flocculant to the wastewater, so that most of the non-water-soluble dye particles and colloidal organic matter in the printing and dyeing wastewater are coagulated into large particles through the potential difference, and then removed by natural precipitation, air floatation and other methods. Due to the strong adsorption capacity of the flocculated alum during the coagulation process, some water-soluble organic matter can also be adsorbed and removed. After the coagulation treatment of the printing and dyeing wastewater, more than 80% of the suspended organic pollutants are removed. At the same time, the chromaticity removal rate can reach 50-95%. The sewage treatment chemicals to be used in the treatment process are polyacrylamide and polyaluminum chloride, and calcium hypochlorite is used as a decolorizing agent. The process focuses on aerobic biological contact oxidation, and its main effect is to degrade organic matter. The anionic polyacrylamide and non-ionic polyacrylamide produced by Nuoer Group have ideal effects as coagulants and low cost. Cationic polyacrylamide is selected for activated sludge dehydration. Generally, cations with relatively low ionicity are selected, and the molecular weight is basically 10 million. The above effect is better. Polyacrylamide.
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