2段生物処理法およびオゾン処理による皮革工場廃水混入下水からのCODと色度の削減

概要

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Industrial wastewaters containing high concentrations of organic substances and ammonia nitrogen, such as leather industry wastewater, are sometimes treated by an activated sludge process in a sewage treatment plant. Such wastewaters tend to raise COD and color in the effluent of an activated sludge process. Refractory organic substance and nitrite build-up are the main causes of COD. It is difficult to reduce COD and color efficiently by the conventional activated sludge process.We studied a two-stage biological process combined an activated sludge process and a fixed-bed reactor to treat leather industry wastewater efficiently. And the use of ozone was studied to reduce COD and color.A two-stage biological process could promote nitrification reaction producing nitrate. COD originated from nitrite build-up was not observed. However, the two-stage biological process could not remove color.Ozone could reduce both COD and color in the effluent of an activated sludge process. However, nitrite build-up worsened the efficiency of ozone oxidation. In view of the economical point, it is important to prevent nitrite build-up in a biological process.
社団法人　日本水環境学会の論文
1997-01-10