两级UASB与好氧组合工艺处理城市生活垃圾渗滤液的启动研究

采用两级UASB与好氧组合工艺处理早期城市生活垃圾渗滤液.系统出水按不同比例回流到一级UASB中进行反硝化,同时进行产甲烷反应,有机物在二级UASB中被进一步降解,好氧池完成剩余有机物的去除和氨氮的硝化.启动阶段通过对原渗滤液不同比例的稀释,分5次逐步提高进水浓度,启动结束时完成了对原渗滤液的高效处理.在进水COD浓度从3000 mg/L提高到15000 mg/L,氨氮浓度从250 mg/L提高到1400 mg/L时,最终COD去除率稳定在92%左右,氨氮去除率可达99%以上,一级UASB中反硝化率接近100%,回流比为300%时系统总氮去除率为70%～80%.

Start up of two-stage up-flow anaerobic sludge blanket and aerobic reactor in treating municipal landfill leachate

A two stage up-flow anaerobic sludge blanket(UASB)-aerobic system was used to treat leachate from a immature landfill.Different proportion effluent of this system was recycled to the first UASB where simultaneous denitrification and methanogenesis were carried out.Organic substance was further removed in the second UASB and aerobic reactor accomplished residual COD removal and nitrification.Raw leachate was diluted with tap water in different proportions and the influent was increased by five phases,high-rate removal of COD was achieved when start up finished.When COD concentration was from 3000 mg/L to 15 000 mg/L,COD removal efficiency can be maintained around 92%.When NH~+_4-N concentration was from 250 mg/L to 1400 mg/L,NH~+_4-N removal efficiency was kept above 99%,denitrification efficiency was nearly 100%,total nitrogen removal efficiency was 70%~80% when recycle ration was 300%.