Kwarciak-Kozłowska Anna, Fijałkowski Krzysztof L
Institute of Environmental Engineering, Czestochowa University of Technology, Czestochowa, Poland.
Institute of Environmental Engineering, Czestochowa University of Technology, Czestochowa, Poland.
J Environ Manage. 2021 Jun 1;287:112309. doi: 10.1016/j.jenvman.2021.112309. Epub 2021 Mar 14.
Leachate generated in landfills are characterized by high toxicity related to, high concentrations of organic and non-organic pollutants, therefore, it is advisable to use highly effective methods of their purification to prevent environmental contamination. The aim of this study was to determine the treatment efficiency of landfill leachate during the application of integrated processes: advanced oxidation (AOP) and biochar adsorption (BC). In the case of the AOP, the chemical process was the Fenton reaction in which the source of hydroxyl radicals was HO (system I) and SPC - sodium percarbonate (system II). Leachate was derived from the regional municipal waste landfill in Silesian Province (Poland) which was characterized by the pH of 8.40, COD value was 3155 mg L and BOD was under 165 mg L. The BOD/COD ratio was at a low level (0.053) that indicated low biodegradability. The applied systems allowed of the COD reduction index to the level of 549 mg L (HO+BC) and 944 mg L (SPC+BC) where the limit threshold is 125 mg L. In the same case of the TOC index, these values were respectively 119 and 186 mg L, where the limit value is 30 mg L.This study has been aimed to estimate the toxicity of leachate treatment in integrated systems: AOP processes + biochar adsorption. Toxicity of treated and untreated leachate has been analysed by Sinapis alba and Lepidium sativum plants-based tests. It was found that while conducting the Fenton process as system I (HO) at all reagent doses, the removal efficiency of COD and TOC was 17% and 12% higher, respectively, compared to system II. The most advantageous dose of regents was 2.5:1 and biochar - 2 g L. It was observed that in the SPC+BC system the roots of L. sativum and S. alba were on average 34% and 28% longer compared to the HO+BC system. Higher germination index (GI) of both tested plants, indicating lower wastewater toxicity, was recorded for the SPC+BC system.
垃圾填埋场产生的渗滤液具有高毒性，与高浓度的有机和无机污染物有关，因此，建议采用高效的净化方法以防止环境污染。本研究的目的是确定在综合工艺（高级氧化（AOP）和生物炭吸附（BC））应用过程中垃圾渗滤液的处理效率。在AOP的情况下，化学过程是芬顿反应，其中羟基自由基的来源是HO（系统I）和过碳酸钠（SPC，系统II）。渗滤液取自波兰西里西亚省的区域城市垃圾填埋场，其pH值为8.40，化学需氧量（COD）值为3155mg/L，生化需氧量（BOD）低于165mg/L。BOD/COD比值处于较低水平（0.053），表明生物降解性较低。所应用的系统使COD降低指数达到549mg/L（HO+BC）和944mg/L（SPC+BC），限值阈值为125mg/L。在总有机碳（TOC）指数的相同情况下，这些值分别为119和186mg/L，限值为30mg/L。本研究旨在评估综合系统（AOP工艺+生物炭吸附）中渗滤液处理的毒性。通过基于白芥和水萝卜植物的试验分析了处理前后渗滤液的毒性。结果发现，在所有试剂剂量下，作为系统I（HO）进行芬顿工艺时，COD和TOC的去除效率分别比系统II高17%和12%。最有利的试剂剂量为2.5:1，生物炭为2g/L。观察到，与HO+BC系统相比，在SPC+BC系统中，水萝卜和白芥的根平均长34%和28%。SPC+BC系统记录到两种受试植物的发芽指数（GI）较高，表明废水毒性较低。
