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Development trend of printing and dyeing wastewater treatment technology



Source: Industrial heavy metal wastewater treatment Author: admin Date: 2018-07-11 13:39 Browse:

    Printing and dyeing wastewater It is one of the main sources of water pollution, which is characterized by large amount of sewage and difficult treatment. It is estimated that the average water consumption for the production of 100 meter standard cloth is about 2.5 tons. The composition of wastewater is complex and the color is high. At the same time, the wastewater contains a lot of organic matter, high CODcr value and high alkalinity, which is difficult to treat.
At present, the main treatment methods are divided into physical method, chemical method, physical-chemical method and biochemical method. In recent years, the application of photocatalysis and electrochemistry to control printing and dyeing wastewater has attracted extensive attention. However, physical and chemical treatment methods are usually expensive, and the waste generated is difficult to treat, inefficient and limited in application. The biological treatment method is easy to operate, low operating cost, no secondary pollution, environmentally friendly, and has attracted more and more attention in the treatment of printing and dyeing wastewater.
 
Printing and dyeing wastewater Common processing technologies
At present, aerobic biological process, anaerobic process and combined treatment technology are mainly used in China.
1. Aerobic treatment of printing and dyeing wastewater. It is further divided into activated sludge process and biofilm process.
2. The dye was degraded by anaerobic treatment. Dyes containing triacyl and hydroxyl groups can be degraded. However, the degradation products of these dyes are aromatic amine compounds, which are carcinogenic and cannot be anaerobic. Under these conditions, it will continue to degrade, that is, it can not be completely degraded to realize the inorganic dye. Therefore, it is rarely reported that printing and dyeing wastewater is directly treated by anaerobic reactor. However, the efficiency of the new anaerobic treatment device has been greatly improved, and the requirements of influent COD concentration are greatly reduced. Wastewater with COD value of 2000 mg / l can also be achieved through anaerobic digestion and primary biological treatment.
The combined treatment technology is a combination of anaerobic process and aerobic process. Anaerobic and aerobic processes will be connected in series to treat printing and dyeing wastewater. Among them, anaerobic treatment mainly hydrolyzes and acidifies some polymer materials with poor biodegradability in printing and dyeing wastewater to make them become smaller molecules or change the molecular structure of refractory organics, so as to improve the biodegradability of wastewater. To create conditions for aerobic therapy. At the same time, the excess sludge produced in the aerobic stage can be completely returned to the anaerobic tank. Due to the long solid residence time in the anaerobic stage, the sludge can be completely anaerobic digested, so there is no residual pollution in the whole system. Mud discharge.
 
Main development direction
 
At present, the main development direction of printing and dyeing wastewater treatment is the combination of microorganism and processing technology. Many environmental engineers are committed to screening bacteria and constructing genetically engineered bacteria. Using a large number of natural resources to serve mankind. However, the newly developed bacteria used in wastewater treatment may not achieve the expected enhancement effect. No matter whether the strain can occupy a dominant position in the treatment system, whether the complex components in the wastewater will inhibit its growth... Many factors will affect the treatment effect. Therefore, the application of biotechnology must go through strict environmental safety testing and assessment. At the same time, the mechanism of dye degradation and microbial metabolism needs to be further studied and clarified.


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