Landfill leachate can introduce compounds that absorb ultraviolet (UV) light and thus affect UV disinfection efficiency at municipal wastewater treatment plants when leachate is co-treated. Thus, UV quenchers should be removed or reduced before leachate is sent to a municipal wastewater treatment plant. Herein, a chemical oxidant, sodium percarbonate (SPC, Na2CO3 1.5 H2O2), was investigated to oxidize two types of landfill leachates with a focus on UV quenching reduction. The oxidation with 0.2 M SPC for 24 hours reduced Leachate A’s organics concentration by 15.6 % and UV254nm absorbance by 43.4 %; it was 15.1 % and 7.9 %, respectively, for Leachate B. Both the specific ultraviolet absorbance (SUVA254nm) and e280nm absorption coefficient decreased in Leachate A after 0.2 M SPC oxidation, but increased in Leachate B. The organics with size < 1 kDa were the major contributor to UV absorbance in both raw leachates, but exhibited different behaviors after SPC oxidation with significantly different contributions to UV absorbance reduction. The maximum chemical oxygen demand (COD) reduction was 5.3 kg m-3 (with 0.05 M SPC) in Leachate A, resulting in a treatment cost of $0.8 per kg of COD removed. SPC oxidation greatly reduced the turbidity of Leachate A (>99%), and increased its bioavailability. The results of this study can be used to develop a cost-effective method for removing UV quenchers from landfill leachate.

中文翻译：

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垃圾渗滤液中的过碳酸盐氧化以去除紫外线猝灭剂

垃圾渗滤液可以引入吸收紫外线（UV）的化合物，因此当渗滤液经过共同处理时，会影响市政废水处理厂的紫外线消毒效率。因此，在将沥滤液送至市政废水处理厂之前，应去除或减少紫外线淬灭剂。本文中，研究了一种化学氧化剂过碳酸钠（SPC，Na2CO3 1.5 H2O2）以氧化两种类型的垃圾渗滤液，重点是减少紫外线猝灭。用0.2 M SPC氧化24小时，使渗滤液A的有机物浓度降低了15.6％，UV254nm的吸光度降低了43.4％。渗滤液B的分别为15.1％和7.9％。经过0.2 M SPC氧化后，渗滤液A中的比紫外线吸收率（SUVA254nm）和e280nm吸收系数均降低，而渗滤液B中的增加。1 kDa是两种原始渗滤液中UV吸收的主要贡献者，但在SPC氧化后表现出不同的行为，而对UV吸收降低的贡献则显着不同。在渗滤液A中，最大化学需氧量（COD）减少量为5.3 kg m-3（SPC为0.05M），每公斤去除的COD的处理成本为0.8美元。SPC氧化极大地降低了渗滤液A的浊度（> 99％），并提高了其生物利用度。这项研究的结果可用于开发一种经济有效的方法，用于从垃圾渗滤液中去除紫外线淬灭剂。05 M SPC），每公斤去除的COD的处理成本为$ 0.8。SPC氧化极大地降低了渗滤液A的浊度（> 99％），并提高了其生物利用度。这项研究的结果可用于开发一种经济有效的方法，用于从垃圾渗滤液中去除紫外线淬灭剂。05 M SPC），每公斤去除的COD的处理成本为$ 0.8。SPC氧化极大地降低了渗滤液A的浊度（> 99％），并提高了其生物利用度。这项研究的结果可用于开发一种经济有效的方法，用于从垃圾渗滤液中去除紫外线淬灭剂。