Faculty of Urban Construction and Environmental Engineering, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing 400045, China.
J Hazard Mater. 2010 Jun 15;178(1-3):699-705. doi: 10.1016/j.jhazmat.2010.01.144. Epub 2010 Feb 4.
The leachate from Changshengqiao landfill (Chongqing, China) was characterized and submitted to a combined process of air stripping, Fenton, sequencing batch reactor (SBR), and coagulation. Optimum operating conditions for each process were identified. The performance of the treatment was assessed by monitoring the removal of organic matter (COD and BOD(5)) and ammonia nitrogen (NH(3)-N). It has been confirmed that air stripping (at pH 11.0 and aeration time 18h) effectively removed 96.6% of the ammonia. The Fenton process was investigated under optimum conditions (pH 3.0, FeSO(4).7H(2)O of 20 g l(-1) and H(2)O(2) of 20 ml l(-1)), COD removal of up to 60.8% was achieved. Biodegradability (BOD(5)/COD ratio) increased from 0.18 to 0.38. Thereafter the Fenton effluent was mixed with sewage at dilutions to a ratio of 1:3 before it was subjected to the SBR reactor; under the optimum aeration time of 20 h, up to 82.8% BOD(5) removal and 83.1% COD removal were achieved. The optimum coagulant (Fe(2)(SO(4))(3)) was a dosage of 800 mg l(-1) at pH of 5.0, which reduced COD to an amount of 280 mg l(-1). These combined processes were successfully employed and very effectively decreased pollutant loading.
长生桥垃圾填埋场（中国重庆）渗滤液经过气提、芬顿、序批式反应器（SBR）和混凝等组合工艺处理。确定了每个过程的最佳操作条件。通过监测有机物（COD 和 BOD5）和氨氮（NH3-N）的去除来评估处理性能。已经证实，气提（pH 值 11.0 和曝气时间 18 小时）可有效去除 96.6%的氨。在最佳条件下（pH 值 3.0、FeSO4·7H2O 为 20 g l-1 和 H2O2 为 20 ml l-1）研究了芬顿工艺，COD 去除率高达 60.8%。可生物降解性（BOD5/COD 比）从 0.18 增加到 0.38。此后，芬顿废水与污水按 1:3 的比例混合，然后进入 SBR 反应器；在最佳曝气时间 20 小时下，BOD5 去除率高达 82.8%，COD 去除率高达 83.1%。最佳混凝剂（Fe2(SO4)3）的投加量为 800 mg l-1，pH 值为 5.0，可将 COD 降低至 280 mg l-1。这些组合工艺成功应用，非常有效地降低了污染物负荷。
