Qiu Aifeng, Cai Qiang, Zhao Yuan, Guo Yingqing, Zhao Liqian
School of Environmental and Safety Engineering, Changzhou University, No. 1 GeHu Road, Wujin District, Changzhou 213164, Jiangsu, China.
Yangtze Delta Region Institute of Tsinghua University, No. 705, Yatai Road, Nanhu District, Jiaxing 314006, Zhejiang, China.
Int J Environ Res Public Health. 2016 Dec 21;13(12):1262. doi: 10.3390/ijerph13121262.
Landfill leachate is composed of a complex composition with strong biological toxicity. The combined treatment process of coagulation and sedimentation, anaerobics, electrolysis, and aerobics was set up to treat landfill leachate. This paper explores the effect of different operational parameters of coagulation and sedimentation tanks and electrolytic cells, while investigating the combined process for the removal efficiency of physicochemical indices after processing the landfill leachate. Meanwhile, a battery of toxicity tests with , zebrafish larvae, and embryos were conducted to evaluate acute toxicity and calculated the toxicity reduction efficiency after each treatment process. The combined treatment process resulted in a 100% removal efficiency of Cu, Cd and Zn, and a 93.50% and an 87.44% removal efficiency of Ni and Cr, respectively. The overall removal efficiency of chemical oxygen demand (COD), ammonium nitrogen (NH₄⁺-N), and total nitrogen (TN) were 93.57%, 97.46% and 73.60%, respectively. In addition, toxicity test results showed that the acute toxicity of landfill leachate had also been reduced significantly: toxicity units (TU) decreased from 84.75 to 12.00 for zebrafish larvae, from 82.64 to 10.55 for zebrafish embryos, and from 3.41 to 0.63 for . The combined treatment process was proved to be an efficient treatment method to remove heavy metals, COD, NH₄⁺-N, and acute bio-toxicity of landfill leachate.
垃圾渗滤液成分复杂，具有很强的生物毒性。为此构建了混凝沉淀、厌氧、电解和好氧的联合处理工艺来处理垃圾渗滤液。本文探讨了混凝沉淀池和电解池不同运行参数的影响，同时研究了该联合工艺对垃圾渗滤液处理后理化指标的去除效率。此外，还进行了一系列针对大型溞、斑马鱼幼体和胚胎的毒性试验，以评估急性毒性，并计算各处理工艺后的毒性降低效率。联合处理工艺对铜、镉和锌的去除率达到100%，对镍和铬的去除率分别为93.50%和87.44%。化学需氧量（COD）、氨氮（NH₄⁺-N）和总氮（TN）的总去除率分别为93.57%、97.46%和73.60%。此外，毒性试验结果表明，垃圾渗滤液的急性毒性也显著降低：大型溞的毒性单位（TU）从84.75降至12.00，斑马鱼幼体从82.64降至10.55，斑马鱼胚胎从3.41降至0.63。联合处理工艺被证明是一种去除垃圾渗滤液中重金属、COD、NH₄⁺-N和急性生物毒性的有效处理方法。
