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Experiment on Sodium Hydrosulphite Waste Water Treatment by Photic-catalytic Oxidation-Biochemistry and Its Application

Jiang Bing (Anhui Chlor-alkali Chemical Industrial Group Co. Ltd,, Hefei 230011)  
Treatment of organic rich sodium hydrosulfite wastewater with high COD_(Cr) was studied and the method was applied in the production. The results indicated that the COD_(Cr) of sodium hydrosulfite wastewater could be reduced over 80 percent by photic-catalytic oxidation-biochemistry treatment with wastewater from the production of chloro-alkali, i.e. chlorine water as oxidant. Actual production shows that the COD_(Cr) of wastewater after treatment is less than 150 mg/L and meets the requirements of discharge. Wastewater is treated by waste chlorine water, which costs low in the treatment of sodium hydrosulphite.
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