Abstract:

The leachate from waste incineration power plants containing high ammonia nitrogen and non-biodegrable organics which had been treated by regular biochemical treatment was hard to reach the discharge standard.A combined process,Fenton-BAF,has been used for its advanced treatment.A pilot study shows that the optimal operating conditions of Fenton oxidation are as follows:initial pH=6,m(H₂O₂)∶m(COD)=1.5,n(Fe²⁺+)∶n(H₂O₂)=1.0.HRT of BAF is 5-8 h and temperature is 20-22 ℃.Based on that,two stages of Fenton-BAF advanced treatment systems are added to the original biochemical treatment system.After running stably for 3 months,when the average influent COD is about 900 mg/L,and ammonia nitrogen about 80 mg/L,the average effluent COD is less than 90 mg/L,and ammonia nitrogen less than 3 mg/L.The average COD and ammonia nitrogen removing rates are both over 90%.The treatment cost is about CNY17.68 per ton.

Key words: waste incineration, leachate, advance treatment, Fenton oxidation, biological aerated filter

摘要：

垃圾焚烧发电厂渗滤液具有高氨氮及含大量难生物降解有机物等特点,采用常规的生化处理难以达标排放。对此提出了采用Fenton-BAF组合工艺进行深度处理。中试研究结果表明,Fenton氧化最适宜的操作条件为初始pH=6,m(H₂O₂)∶m(COD)=1.5,n(Fe²⁺+)∶n(H₂O₂)=1.0;BAF的HRT为5-8 h,温度为20-22℃。在此研究基础上于原生化处理系统后增加两级Fenton-BAF深度处理系统,经3个月的稳定运行,当平均进水COD约为900 mg/L,氨氮约为80 mg/L时,平均出水COD<90 mg/L,氨氮<3 mg/L,平均COD、氨氮去除率均超过90%,处理成本约为17.68元/t。

关键词: 焚烧垃圾, 渗滤液, 深度处理, Fenton氧化, 曝气生物滤池

CLC Number: 

• X703.1