Fenton氧化-前置反硝化缺氧好氧池(A/O)处理荧光增白剂废水中试研究

Pilot-scale study on treatment of fluorescent brightener wastewater by Fenton reagent-A/O process

采用Fenton氧化-前置反硝化缺氧好氧池(A/O)对荧光增白剂废水IC出水进行中试实验研究。实验表明,在Fe2+投加量为0.003 mol/L,进水pH值为3,[H2O2]/[Fe2+]为4∶1,反应时间为2 h的条件下,Fenton氧化法对COD的去除率可以达到46%以上,出水BOD5/COD的值由0.26提高到0.58。氧化后废水进入前置反硝化生物脱氮系统进行生化处理,该系统采用间歇式进水,水力停留时间为2 d,实验结果表明,A/O系统对COD、氨氮和总氮的去除率分别达41%、90%以上和86%。该组合工艺对COD的总去除率可达到67%,出水氨氮在20 mg/L以下,总氮在37 mg/L以下。

This study systematically evaluated the efficiency of the Fenton reagent-A/O treatment method used in fluorescent brightener wastewater from IC reactor.The results showed that the removal rate of COD reaches over 46% and the BOD5/COD parameter in effluent rises from 0.26 to 0.58 when the dosage of Fe2＋is 0.003 mol/L,influent pH is 3,/ is 4∶ 1 and reacting time is 2 h.After oxidation,wastewater was introduced into the A/O system intermittently for biochemical treatment with 2 d HRT.The removal rates of COD,NH3-N and TN are beyond 41%,90% and 86%,respectively.The technology can achieve the COD removal rate of higher than 67%,the NH3-N concentration of less than 20 mg/L and the TN concentration of less than 37 mg/L.