How to treat printing and dyeing wastewater? Polyacrylamide manufacturers tell you

One of the factors hindering the development of textile printing and dyeing industry is environmental protection issues, and wastewater treatment is the main problem of environmental protection issues, statistics in 2008, textile wastewater emissions accounted for 10.6% of the national wastewater emissions, emissions 2.3 billion tons, ranking third in industrial emissions, COD emissions of 3.14 billion tons, ranking fourth in industrial emissions. Accounting for 7.76% of the national industrial wastewater discharge, printing and dyeing wastewater has always become the focus and difficulty of Water Treatment Chemicals technology research because of its large discharge and high treatment difficulty. At the same time, with the rapid development of China's economy, the shortage of water resources has become a limiting factor restricting the further development of China's printing and dyeing industry. In order to realize the sustainable development of printing and dyeing industry, the recycling of printing and dyeing wastewater has become the key to achieve this goal.

Printing and dyeing wastewater contains high organic content, large alkaline, water quality changes, wastewater contains dyes, additives, slurry, oil, acid and alkali, fiber impurities, sand substances, inorganic salts, printing and dyeing wastewater is a large industrial wastewater discharge, the composition is more complex, belongs to one of the more difficult to treat industrial wastewater. So what works best? Henan Hongze Environmental Protection Technology Co., a manufacturer of polyacrylamide, 

Polyaluminum Chloride, tells you a lot of facts.

According to the characteristics of printing and dyeing wastewater, the measures of reuse or comprehensive utilization of wastewater are generally adopted. In China, the treatment of printing and dyeing wastewater is also mainly combined with physical and chemical treatment and secondary special treatment processes, in which physical and chemical treatment is mainly coagulation precipitation and coagulation air flotation, and in the biochemical treatment facilities that have been put into operation, most of the activated sludge method is used, and the application of SBR process is also gradually increasing. Here we mainly introduce coagulation pretreatment process and subsequent biochemical treatment process.