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How To Deal With Chemical Industry Wastewater?
- Jul 09, 2018 -

How to deal with chemical industry wastewater?

Chemical industry wastewater mainly comes from the production wastewater discharged from petrochemical industry, coal chemical industry, acid and alkali industry, fertilizer industry, plastics industry, pharmaceutical industry, dye industry and rubber industry. The main measures for the prevention and control of chemical wastewater pollution are: firstly, the production process and equipment should be reformed, pollutants should be reduced, waste water should be prevented from being discharged, and comprehensive utilization and recycling should be carried out; the wastewater to be discharged should be selected according to water quality and requirements.

The primary treatment mainly separates suspended solids, colloids, oil slicks or heavy oil in water. Water quality and water volume adjustment, natural sedimentation, floating and oil separation methods can be used. The secondary treatment mainly removes the biodegradable organic solute and some colloids, reduces the biochemical oxygen demand and part of the chemical oxygen demand in the wastewater, and is usually treated by biological methods. A considerable amount of COD remains in the biologically treated wastewater, sometimes with a high color, smell, taste, or high environmental sanitation standards, and further purification is required by a three-stage treatment. The tertiary treatment is mainly to remove organic pollutants and dissolved inorganic pollutants that are difficult to biodegrade in wastewater. Commonly used methods include activated carbon adsorption and ozone oxidation, and ion exchange and membrane separation techniques can also be used. Various chemical industry wastewaters can be selected according to different water quality, water quantity and post-treatment external drainage quality.