The large amount of China's textile industry, resulting in a large amount of waste water, high concentrations of water pollution is a serious hazard to one of the key industries. Due to the particularity of printing and dyeing industry, printing and dyeing wastewater has the characteristics of large fluctuation of water quality, high content of organic pollutants, high chroma and large alkalinity. The treatment of printing and dyeing wastewater not only removes COD, but also removes the pollutants such as chroma , Is one of the difficulties in the current industrial wastewater treatment.
At present, the textile dyeing and finishing wastewater treatment multi-choice pretreatment, mainly to biological treatment, physical and chemical treatment technology supplemented by comprehensive treatment technology. The pretreatment technology uses the grid, neutralization, water quality and air flotation, etc .; biological treatment using hydrolysis and aerobic treatment process, aerobic treatment technology using activated sludge, biological contact oxidation, biological activated carbon (PACT) And biological aerated filter (BAF) technology; physical and chemical treatment using coagulation sedimentation, sand filtration technology and membrane separation technology. The main advantages and disadvantages of various methods are shown in Table 1.
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