Combination of electro-oxidation and biological processes for lindane landfill leachate treatment: simultaneous degradation of contaminants and biological reduction of electro-generated chloride-derived by-products,Journal of Hazardous Materials

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Combination of electro-oxidation and biological processes for lindane landfill leachate treatment: simultaneous degradation of contaminants and biological reduction of electro-generated chloride-derived by-products
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-05 , DOI: 10.1016/j.jhazmat.2024.135765
Marco De Carluccio ₁ , Julia Isidro ₂ , Jesús Fernández-Cascán ₃ , Cristina Saez ₂ , Manuel Andrés Rodrigo ₂ , Luigi Rizzo ₁

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Real lindane landfill leachate (HCH-LL) is characterised by high chlorinated organic compounds concentrations (primarily hexachlorocyclohexane (HCH) isomers and degradation products generated during more than 40 years of ageing), posing environmental and human health risks. In this work, the co-treatment of real HCH-LL (pre-treated via electro-oxidation (EO)) and urban wastewater using an activated sludge process operated in an anoxic/oxic sequencing batch (A/O-SBR) mode was investigated. EO tests were conducted employing either a boron-doped diamond (BDD) anode or a dimensionally stable anode (DSA), resulting in effective HCH isomers removal (>93 % after 20 Ah/L). Chloride-derived by-products (CDBPs) such as free chlorine (up to 828 mg Cl2/L), chlorate (up to 972 mg/L) (formed with EO (DSA)) and perchlorate (up to 1830 mg/L) (with EO (BDD)) persisted after the treatment. EO (DSA) resulted in inhibitory effects (up to 100 % respiration inhibition) on the biological process. Conversely, EO (BDD) negligibly affected biological respiration (up to 20 % less than without pre-treatment), while perchlorate bio-reduction by A/O-SBR was poor (28 %). Acetate addition in pre-treated HCH-LL for perchlorate bio-reduction allowed to achieve simultaneous contaminants removal (> 99 %) and CDBPs reduction (up to 100 %). Biodegradation and bio-adsorption tests without pre-treatment showed partial HCH isomers removal (about 40 %) and poor bio-adsorption.

中文翻译：

电氧化和生物工艺相结合进行林丹垃圾填埋渗滤液处理：同时降解污染物和生物还原电生氯化物衍生副产物

真正的林丹垃圾渗滤液（HCH-LL）的特点是氯化有机化合物浓度高（主要是六氯环己烷（HCH）异构体和 40 多年老化过程中产生的降解产物），对环境和人类健康构成风险。在这项工作中，研究了使用在缺氧/含氧测序批处理（A/O-SBR）模式下运行的活性污泥工艺对真正的 HCH-LL（通过电氧化（EO）进行预处理）和城市废水的共处理。使用掺硼金刚石（BDD）阳极或尺寸稳定的阳极（DSA）进行 EO 测试，从而有效去除 HCH 异构体（20 Ah/L 后 >93 %）。氯化物衍生的副产物（CDBP），如游离氯（高达 828 毫克 Cl2/升）、氯酸盐（高达 972 毫克/升）（由 EO （DSA）形成）和高氯酸盐（高达 1830 mg/L）（与 EO （BDD）在处理后仍然存在。EO （DSA）对生物过程产生抑制作用（高达 100% 的呼吸抑制）。相反，EO （BDD）对生物呼吸的影响可以忽略不计（比未预处理时少 20%），而 A/O-SBR 的高氯酸盐生物还原效果较差（28%）。在预处理的 HCH-LL 中添加乙酸盐以进行高氯酸盐生物还原，可以同时实现污染物去除（> 99 %）和减少 CDBP（高达 100 %）。未经预处理的生物降解和生物吸附测试显示，HCH 异构体部分去除（约 40%），生物吸附不良。

更新日期：2024-09-05

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