Silicon Solar Panels Production Wastewater Treatment Process Study

China is the world’s largest silicon solar cells producer, he was frequently exposed behind the hugeproduction capacity of the economic benefits of environmental pollution problems. National attention toenvironmental protection, the increasingly stringent requirements of industrial wastewater discharge, thethe solar wafers battery manufacturers must seek low operating costs of sewage treatment, a high degree ofprocessing and stability of the treatment process.Silicon solar cells are divided into monocrystalline silicon solar cells and polycrystalline silicon solarcells, according to the different production processes produce waste water are not the same, in general canbe summarized as a small amount of concentrated alkali waste liquid, containing a small amount ofhydrofluoric acid （higher concentration） acid waste, a large number of general acid-base wastewater,containing a large number of hydrofluoric acid （low concentration） acid wastewater. And wastewaterpollutant concentration varies greatly with wastewater, wastewater discharge flow of sub-period, the pH ofthe waste water highly corrosive to the equipment large, poor biodegradability, F-content characteristics.Most domestic treatment plant plus calcium coagulation and sedimentation processes for wastewatertreatment. This topic Xining and Xi’an for two solar cell production wastewater enterprises, on a single,polycrystalline silicon solar cell production waste water at the same under different wastewater treatmentprocesses to study and compare economic indicators.Monocrystalline silicon solar cell production1、Polycrystalline silicon solar cell production using acid wastewater effluent wastewater containinghigh concentrations of hydrofluoric acid, hydrofluoric acid wastewater and waste separately CaCl₂-PAC-PAM coagulation sedimentation treatment process engineering cost estimates5.2645million yuan, thetotal estimated Investment8,349,600yuan, drug consumption3,933,850yuan,4686860yuan total cost ofoperation, sewage treatment unit cost18.07yuan/ton, the optimal solution processes.2、Monocrystalline silicon solar cells using acid production wastewater effluent wastewater containinghigh concentrations of hydrofluoric acid, hydrofluoric acid wastewater and waste separately CaCl₂-PAC-PAM Coagulation-hydrolytic acidification treatment process engineering cost estimates7.1284millionyuan, total investment is estimated11,169,800yuan, drug consumption5,244,550yuan,6.0762millionyuan total cost of operation, sewage treatment unit cost15.58yuan/ton, the optimal solution processes.3、 Single and polycrystalline silicon solar cell production wastewater, when polysilicon solar cellproduction line far more than monocrystalline silicon solar cell production line, COD discharge of wastewater by chemical coagulation and sedimentation filtration treatment can meet emission standards,you can use polycrystalline silicon solar cells Wastewater Treatment conclusions; when the silicon solarcell production line far more than the polysilicon solar cell production line, wastewater effluent COD cannot be treated chemical coagulation filtration can meet emission standards, you can use monocrystallinesilicon cells wastewater treatment conclusion.The subject of actual silicon solar cell production wastewater treatment engineering applications, thereference design can be used for guidance only treatment process selected contrast.