“Advice” for printing and dyeing wastewater treatment, who is the “breaker”?
Industrial wastewater pollution sources are complex, pollutants are diverse, and treatment is difficult. As one type of industrial wastewater, printing and dyeing wastewater has an impact on the environment that cannot be underestimated.
The rapid development of the textile printing and dyeing industry has led to an increase in the amount of printing and dyeing wastewater treated and an increase in the difficulty of treatment. From the printing and dyeing industry itself, the output of printing and dyeing wastewater is relatively large, with high content of organic pollutants, high alkalinity, and large changes in water quality. The wastewater contains fuel, slurry, Oil, acid and alkali, fiber impurities, etc. Data shows that 1 ton of textile printing and dyeing will produce 80%-90% of sewage. Under the current requirements of resource recycling, it is important to achieve a higher degree of recycling of printing and dyeing wastewater.
Previously, the state has mentioned in many documents that it will increase the recycling of wastewater in key industries. The “14th Five-Year Plan for Industrial Green Development” includes “organizing advanced treatment and reuse of printing and dyeing wastewater” as an industrial water-saving and efficiency-enhancing project. The “Industrial Water Efficiency Improvement Action Plan” clarifies that one of the key core technology research directions is printing and dyeing wastewater. Efficient processing and reuse, etc.
It is clear that most of the treated printing and dyeing wastewater will enter reuse channels when the technology matures. In addition to water resource recycling, are there any other substances in printing and dyeing wastewater that can be reused?
①Dye recovery. Shilin dyes are used in the printing and dyeing industry. These dyes can be recycled after being precipitated and filtered by chemicals. ②Alkali recovery. Printing and dyeing wastewater is alkaline wastewater. Purifying and reusing alkali in alkaline wastewater will increase the added value of products and reduce alkali consumption.
Looking at it this way, printing and dyeing wastewater treatment has multiple requirements. It must not only meet the needs of wastewater recycling, but also preferably meet the needs of the above resource recovery, greenenvironmental protectionIt is an essential element for printing and dyeing wastewater treatment.
At present, printing and dyeing wastewater treatment technologies include physical treatment, chemical treatment, physicochemical treatment, biological treatment, etc.
Among the physical methods, membrane separation is an efficient separation technology that utilizes the principle of selective permeability of substances by biological membranes to separate, concentrate, and recover wastewater pollutants to achieve the purpose of wastewater treatment; physicochemical methods include Adsorption method and coagulation method. The adsorption method is suitable for the advanced treatment of low-concentration printing and dyeing wastewater. It has small investment, high convenience and low cost. The coagulation method has small investment, small area, large processing capacity and high decolorization rate. It is one of the most advanced methods in my country. Mainstream wastewater treatment methods used by small printing and dyeing enterprises…
Attention to membrane bioreactors is gradually increasing. Will it be the “terminator” of printing and dyeing wastewater?
It is reported that this technology is a new sewage and wastewater treatment process that combines membrane separation and biological treatment technology. It uses membrane components to replace the sedimentation tank, realizes mud-water separation, increases sludge concentration and reaction rate, and enhances system resistance. Impact force, and can achieve separate control of SRT (soil age) and HRT (hydraulic retention time). Currently, research around membrane bioreactor technology continues, and new solutions are constantly being provided for printing and dyeing wastewater.
However, the relevant technologies are not yet mature, and printing and dyeing wastewater treatment needs are different. Companies still need to select specific treatment processes based on specific conditions.
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