With the development of China's industry, the discharge of industrial wastewater is increasing, and the processing market is also climbing. With the deepening of the clear water defense war, the overall technical level of China's water treatment equipment has developed rapidly. The main product separation equipment, oxidation disinfection equipment and domestic treatment equipment have been able to meet the processing needs of general industrial wastewater and domestic sewage, and the processing capacity has also improved.
The emergence of third-party governance has opened up new avenues for industrial wastewater treatment. In recent years, the proportion of sewage discharged by the textile industry to the national industrial wastewater discharge is still large, which has attracted the attention of relevant departments. On September 26, 2019, the Ministry of Ecology and Environment issued the "Water Pollution Standards for Textile Industry" (Draft for Comment), which standardized and tightened the water pollutant discharge standards for garment enterprises.
It is understood that in order to reduce the emission of toxic and harmful pollutants, the standard has increased the acute toxicity of large cockroaches and the acute toxicity of luminescent bacteria. For example, the limits of chemical oxygen demand (COD) are stricter than the standard limits of similar industries in developed countries. value. After the implementation of the new standard, the adjustment of the baseline displacement and ammonia nitrogen and other pollutant indicators will bring about a significant reduction in the amount of sewage and ammonia nitrogen emissions.
The tightening of emission standards limits the emissions of textile printing and dyeing wastewater from the source, and the treatment at the end is equally important. At present, wastewater treatment includes physical treatment, chemical treatment, biological treatment and other technologies. The industry believes that biological treatment technology as the core, physical and chemical treatment technology as an auxiliary comprehensive wastewater treatment program, is very suitable for wastewater treatment in the textile printing and dyeing industry.
The addition of various new printing and dyeing auxiliaries further increases the difficulty in the treatment of printing and dyeing wastewater. Traditional treatment methods or separate technologies have been difficult to meet the comprehensive management needs, so the synergy of various treatment technologies has become a major method. For example, ozone oxidation combined with catalyst, ultrasonic, ultraviolet and micro-electrolysis can effectively improve the efficiency of ozone oxidation technology in the treatment of printing and dyeing wastewater.
The data show that the dyeing and finishing industry is the most important source of pollution in the textile industry, including desizing, refining, bleaching, mercerizing, dyeing, printing, finishing, etc. The textile printing and dyeing wastewater has a large amount of water, high content of organic pollutants, and large changes in water quality. It is a kind of sewage that is difficult to handle in industrial sewage.
The development of textile printing and dyeing technology has led to the increasingly complex composition of printing and dyeing wastewater, and the difficulty in wastewater treatment. The reuse of industrial wastewater treatment will be an important direction for the treatment of printing and dyeing wastewater in the future. This is the consensus of many industry experts. According to data analysis, the average daily discharge of dyed wastewater in China is as high as 3 million to 4 million cubic meters. If all these wastewaters are recycled, it will save 20% of the daily average domestic water consumption of the national residents.
Regional concentration is a distinctive feature of the printing and dyeing industry, mainly distributed in South China and East China. This indicates that environmental protection in the textile printing and dyeing industry is still an arduous task in the area where textile printing and dyeing enterprises gather.
Wastewater from textile printing and dyeing enterprises is generally discharged through centralized treatment of sewage treatment plants, but when the treatment capacity of sewage treatment plants is limited, it becomes a concentrated “source of pollution”. On the other hand, the "concentration" is relatively "distributed", the difficulty of processing has been reduced, how to break through the demand from this point, turn "fraud" into "profit", improve the recycling rate of textile printing and dyeing wastewater, and it is also a Way out.
Changzhou Lingda Chemical Co., Ltd. main production and management: SORONA, Carpet adhesive, adhesive additives, silicone oil series, Carpet adhesive, polypropylene filament oil, polyester filament oil, polypropylene BCF plying stereotypes yarn, Carpet adhesive, Polypropylene carpet silk, polypropylene BCF yarn.
