Wang Xiaojun, Chen Sili, Gu Xiaoyang, Wang Kaiyan
School of Environmental Science and Engineering, South China University of Technology, People's Republic of China.
Waste Manag. 2009 Apr;29(4):1354-8. doi: 10.1016/j.wasman.2008.10.006. Epub 2008 Dec 9.
Mature landfill leachate is typically non-biodegradable. A combination process was developed that includes coagulation, Fenton oxidation, and biological aerated filtering to treat biologically-produced effluent. In this process, coagulation and Fenton oxidation were applied in order to reduce chemical oxygen demand (COD) organic load, and enhance biodegradability. Poly-ferric sulfate (PFS) at 600 mgl(-1) was found to be a suitable dosage for coagulation. For Fenton oxidation, an initial pH of 5, a total reaction time of 3h, and an H(2)O(2) dosage of 5.4mmoll(-1), with a (H(2)O(2))/n(Fe(2+)) ratio of 1.2 and two-step dosing were selected to achieve optimal oxidation. Under these optimal coagulation and Fenton oxidation conditions, the COD removal ratios were found to be 66.67% and 56%, respectively. Following pretreatment with coagulation and Fenton oxidation, the landfill leachate was further treated using a biological aerated filter (BAF). Our results show that COD was reduced to 75mgl(-1), and the color was less than 10 degrees.
成熟的垃圾渗滤液通常不可生物降解。开发了一种联合处理工艺，包括混凝、芬顿氧化和曝气生物过滤，以处理生物产生的废水。在该工艺中，采用混凝和芬顿氧化以降低化学需氧量（COD）有机负荷，并提高生物降解性。发现600mgL(-1)的聚硫酸铁（PFS）是合适的混凝剂量。对于芬顿氧化，选择初始pH为5、总反应时间为3h、H(2)O(2)剂量为5.4mmolL(-1)、(H(2)O(2))/n(Fe(2+))比为1.2以及两步投加来实现最佳氧化。在这些最佳混凝和芬顿氧化条件下，发现COD去除率分别为66.67%和56%。经过混凝和芬顿氧化预处理后，垃圾渗滤液再用曝气生物滤池（BAF）进一步处理。我们的结果表明，COD降至75mgL(-1)，颜色小于10度。
