生物接触氧化法处理含海水城市污水试验研究

Application of the Bio-contact Oxidation Process for Treatment of Municipal Sewage Containing Seawater

采用生物接触氧化法对含海水城市污水进行了试验研究 .试验结果表明 :当海水比例不超过 35 %时 ,生物接触氧化系统对CODcr的去除率在 84 %以上 ,出水CODcr<10 0mg/L ,NH3 N去除率>90 % ,出水NH3 N <8.0mg/L ,可满足城市污水二级排放要求 ;当海水比例超过 4 5 %时 ,生物接触氧化系统受到了明显影响 ,CODcr去除率仅为 5 5 %～ 75 % ,出水CODcr〉12 0mg/L ,NH3 N去除率也降到 6 7%左右 ;并且随着污水中海水含量的增加 。

Study was made on the use of bio-contact oxidation process for treatment of municipal wastewater containing seawater. The results showed that when the seawater content was below 35%, the removal of COD_(cr) was above 84%, the effluent concentration of COD_(cr) was less than 100 mg/L, and the corresponding index of NH_3-N was above 90% and less than 8.0mg/L respectively. Such effluent was up to second level emission standard of municipal wastewater. But when the seawater content was above 45%, the bio-contact oxidation system was affected sharply, the removal rate of COD_(cr) was only 55%～75%, the effluent concentration of COD_(cr) was more than 120mg/L, furthermore, the rate of NH_3-N was reduced to 67% or so. The kinds and quantity of the microbes were found gradually decreased when the seawater content increased.