The Research of the Pretreatment of Sodium Hydrosulfite Wastewater
In this paper,distillation is chosen as the pretreatment process to investigate the removal effect of chemical oxygen demand(COD)in the wastewater produced during the sodium hydrosulfite production.Meanwhile,the extracted liquid with high organic concentration will be reused for production.The results showed that the COD of the extracted liq-uid increased significantly under different reflux ratios,indicating that the light components in the wastewater were trans-ferred into the extracted liquid and concentrated through gas-liquid mass transfer.However,the COD increase of the ex-tracted liquid decreased with the increasing reflux ration.The optimal reflux ratio in this research was 4∶1.
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