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Membrane Treatment Technology Application
- May 29, 2018 -

Membrane treatment technology application


Membrane treatment technology for printing and dyeing wastewater


The industrial wastewater discharged from textile and printing and dyeing factories has high salt content, high chemical oxygen demand and color, and is difficult to treat by biochemical methods. Traditional treatment processes such as activated sludge process and sedimentation process are difficult to treat water quality to discharge standards. Even ultrafiltration technology in membrane processing cannot remove small molecule contaminants in wastewater. The more efficient treatment is to use biodegradation with activated sludge and then nanofiltration. This technology can treat the printing and dyeing wastewater to the reusable water quality, and the treated water quality indicators in all aspects are close to the groundwater. This treatment technology can recycle 80%-90% of dyeing wastewater.


Membrane treatment for drinking water treatment


The water treatment technology of waterworks is usually flocculation, sedimentation, filtration and chlorination. Although water quality can meet drinking standards, nitrogen can easily grow bacteria and viruses in long-distance transmission pipelines, and the rust after water pipes are rusted can also enter tap water; and tap water. Chlorine added may itself be converted into teratogenic substances such as haloacetic acid. Therefore, it is necessary to further process daily drinking water. The commonly used water purifiers now contain basic water treatment media such as fiber cotton and activated carbon, ceramic membranes, fiber membranes, ion exchange resins, and sterilizers, which can further remove contaminants and bacteria and viruses from drinking water.


Problems in membrane processing technology


Membrane treatment technology has good performance in sewage treatment, but there are still some problems that need to be solved. The main problem is membrane pollution. If the sewage is treated for a long time, the pollutants retained by the membrane will cause contamination to the membrane itself, and the pores of the membrane will be easily clogged, resulting in the problems of reduced sewage treatment efficiency and slower efficiency. Due to the complex composition of the treated wastewater, especially the heavily polluted water, membrane fouling problems are difficult to solve systematically. At present, the better solution is to use precipitating, filtering and other methods to pretreat the sewage, and to adjust the pH of the water to increase the solubility of the hard-to-tolerate salt so as to avoid membrane fouling and blockage.


Development


As a high-efficiency water treatment process, the membrane treatment technology has a good performance in the treatment of water, especially the heavy polluted water. It not only has high processing efficiency and relatively stable performance, but also has broad application prospects. However, there are still some problems that need to be solved, such as membrane fouling problems; in addition, the development of new, high-efficiency membrane materials also requires greater efforts.