

In response to the problems existing in the treatment of industrial wastewater with high fluorine content in the solar cell industry, a complete set of wastewater treatment and resource utilization technologies have been researched and developed. By analyzing the water quality and quantity of different drainage points in typical production processes, the emission points and discharge laws of pollutants in solar cell production were studied and identified, and a source separation plan for high-fluorine-containing wastewater was proposed, which effectively reduced the dosage of chemicals for wastewater treatment., improve the stability of terminal sewage treatment operation. The wastewater fluorine resource process package and wastewater stable compliance treatment technology are mainly used at the front end of the fluorine-containing wastewater treatment system. The wastewater is recycled for fluorine resources, and the effluent is discharged into the terminal wastewater treatment system, and discharged to meet the standards after treatment. This process has been demonstrated in Dongfang Electric Maiji and has also been promoted and applied in Hainan Yingli. A total of 3 patents have been applied for this technology, including 1 international patent and 2 invention patents have been obtained. Through this process, high-fluorine wastewater is treated, and the fluorine recovery rate in wastewater reaches more than 60%. The purity of the obtained calcium fluoride product reaches more than 97%, meeting the fluorine chemical industry standards. It is expected to reduce the amount of terminal wastewater treatment chemicals by more than 90%. It is expected to reduce the amount of sludge discharged from terminal wastewater treatment by nearly 50%. Reduce fluoride ion emissions by more than 150 kg/MW; reduce sludge emissions by nearly 2 t/MW (based on 70% water content) to reduce environmental hazards caused by leaching of fluorine-containing sludge; reduce fluoride ion content in the inlet of the terminal wastewater treatment system, reduce water quality fluctuations, improve the stability of the terminal wastewater treatment system, and reduce environmental risks.
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