ABSTRACT

Open dumping of Municipal Solid Waste (MSW) results in generation of leachate that contains large amounts of organic matter, ammonia, heavy metals, chlorinated organics, phenolic compounds, phthalates, and pesticide residues which irreparably contaminate both surface and groundwater. Advanced Oxidation Processes (AOP) have been reported as one of the effective treatment methods, especially in improving the biodegradability of the leachate as well as effective in removing recalcitrant organics. With AOP pre-treatment rendered the leachate becomes more amenable to further treatment using biological treatment, adsorption, or ion-exchange processes. The study reported in this paper mainly aims at assessing the suitability of ozone and peroxone (O₃+H₂O₂) based advanced oxidation processes (AOP) for the treatment of MSW leachate from the open dumpsite. The effect of reaction time, impact of O₃ dose, and H₂O₂ concentration on the efficiency of COD removal, improvement in the biodegradability of the leachate, and pH change were determined as the performance parameters for the treatment process. The maximum COD removal efficiency was found to be 46% and 82% with ozone alone (3975 mg/L) and with ozone (9275 mg/L) + 50 mg/L H₂O₂ each with 120 min. reaction time. It is also found that the BOD₅/COD ratio has been increased from 0.09 to 0.58 at optimum O₃ + 50 mg/L H₂O₂ treatment would offer as an effective method for increasing the biodegradability.

摘要

露天倾倒城市固体废物 (MSW) 会产生含有大量有机物、氨、重金属、氯化有机物、酚类化合物、邻苯二甲酸盐和农药残留物的渗滤液，这些物质对地表水和地下水造成不可挽回的污染。据报道，高级氧化工艺（AOP）是一种有效的处理方法，尤其是在提高渗滤液的生物降解性以及去除顽固有机物方面效果显着。通过 AOP 预处理，渗滤液变得更易于使用生物处理、吸附或离子交换过程进行进一步处理。本文报道的研究主要旨在评估臭氧和过氧酮（O ₃ +H ₂ O ₂) 基于高级氧化工艺 (AOP) 处理露天垃圾场的 MSW 渗滤液。将反应时间、O ₃剂量的影响和 H ₂ O ₂浓度对 COD 去除效率、渗滤液生物降解性的提高和 pH 值变化的影响确定为处理过程的性能参数。发现单独使用臭氧 (3975 mg/L) 和使用臭氧 (9275 mg/L) + 50 mg/LH ₂ O ₂各 120 分钟的最大 COD 去除效率为 46% 和 82%。反应时间。还发现，在最佳 O ₃  + 50 mg/LH ₂ O _{2时，BOD 5} /COD 比值已从 0.09 增加到 0.58处理将作为提高生物降解性的有效方法。