Process for treating wastewater generated in solar silicon wafer production process

Abstract

The invention discloses a process for treating wastewater generated in a solar silicon wafer production process and relates to wastewater treatment in the field of the electronic semiconductor industry. The process comprises the following steps of: pretreating wastewater in a preliminary sedimentation tank; carrying out Fenton and iron-carbon micro-electrolysis combined oxidization reaction on the wastewater in an iron-carbon micro-electrolysis reactor; after the reaction, feeding the wastewater into a coagulation-sedimentation integrated pool, feeding PAC (Poly Aluminium Chloride) and PAM (Poly Acryl Amide) to arouse the coagu-flocculation reaction of the wastewater, and after the reaction, performing sludge-water separation on the wastewater; causing the supernate to flow to a hydrolysis acidification pool, and then causing the wastewater to flow to a contact oxidation tank; causing the mixed liquid to flow to a secondary sedimentation tank for sludge-water separation, while causing the supernate to flow to a deflection sedimentation pool, and feeding PAC for purifying water so that the supernate is up to the stand and can be discharged after sedimentation; finally, performing concentration treatment on sludge. After non-degradable organic wastewater is treated by the process provided by the invention, the BOD5 (Biological Oxygen Demand) / CODcr (Chemical Oxygen Demand) ratio of the wastewater is obviously increased.

Description

technical field [0001] The invention relates to the treatment of wastewater in the field of electronic semiconductor industry, in particular to a treatment process for wastewater produced in the production process of solar silicon wafers. Background technique [0002] Polysilicon is the key basic material for the manufacture of integrated circuits and photovoltaic solar cells, and an important cornerstone for the development of the country's information industry and photovoltaic new energy industry. However, during the production process, polysilicon production enterprises produce a large amount of industrial wastewater with complex components. If they are not properly treated, they will seriously pollute the water body and endanger the environment. Therefore, how to deal with production wastewater has become a major issue that polysilicon production enterprises must solve in environmental governance. [0003] Wastewater mainly comes from polysilicon slice wastewater and or...

AI Technical Summary

Problems solved by technology

The toxic and harmful metal ions and fluorine in the effluent after traditional treatment cannot meet the standards stably, and the pollution to the water resources and environment is becoming increasingly serious.

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