Centre for Environmental Studies, College of Engineering Guindy, Anna University, Chennai, 600 025, Tamil Nadu, India.
Centre for Environmental Studies, College of Engineering Guindy, Anna University, Chennai, 600 025, Tamil Nadu, India.
J Environ Manage. 2023 Nov 1;345:118794. doi: 10.1016/j.jenvman.2023.118794. Epub 2023 Aug 22.
Landfill leachate is a discrete volumetric component of municipal solid waste; hence, researchers and professionals are more concerned about it because of its obscurity. Innovative treatment and emerging technologies are being scrutinized to address the treatment of landfill leachate challenges. The leading target of this review was to examine the possibility of removing recalcitrant organic pollutants from landfill leachate by photocatalytic-based advanced oxidation processes. A summary of the systematic applicability of conventional treatment for landfill leachate is provided, with a focus on physico-chemical and biological processes. The biological treatment, such as aerobic and anaerobic digestion, is an excellent technique for treating highly concentrated organic pollutants in the wastewater. However, Leachate can scarcely be treated using conventional techniques since it is enriched with refractory organics and inorganic ions. It is clear from the literature review that none of the available combinations of physico-chemical and biological treatments are entirely relevant for the removal of recalcitrant organic pollutants from leachate. Recently, the photo-assisted TiO/ZnO oxidation has shown an excessively potential and feasible way to treat landfill leachate. TiO/ZnO photocatalysis is currently developing to treat recalcitrant organic pollutants from landfill leachate. The effect of operating parameters reveals that pH and temperature affect the reaction rate. The addition of oxidant HO to the TiO/ZnO suspension suggests that TiO leads to an increase in the rate of reaction when compared to ZnO. Photocatalytic remediation technique of landfill leachate would support the goal of environmental sustainability by greatly enhancing the effectiveness of treated leachate reutilization. In this review, the selection of the best photocatalytic treatment for leachate based on its systematic relevance and potential conditions, characteristics, cost-effectiveness, essential controlling, discharge limit, long-term environmental effects, and its future study perspectives are emphasized and discussed.
垃圾渗滤液是城市固体废物的一个离散体积组成部分；因此，由于其不透明性，研究人员和专业人员更加关注它。正在研究创新的处理方法和新兴技术来应对垃圾渗滤液处理的挑战。本综述的主要目的是检查通过光催化高级氧化工艺从垃圾渗滤液中去除难处理有机污染物的可能性。提供了常规处理垃圾渗滤液的系统适用性的摘要，重点是物理化学和生物过程。生物处理，如好氧和厌氧消化，是处理废水中高浓度有机污染物的绝佳技术。然而，由于渗滤液富含难处理的有机物和无机离子，因此很难使用传统技术进行处理。从文献综述中可以清楚地看出，物理化学和生物处理的现有组合都不完全适用于从渗滤液中去除难处理的有机污染物。最近，光辅助 TiO/ZnO 氧化已显示出处理垃圾渗滤液的非常有潜力和可行的方法。TiO/ZnO 光催化技术目前正在开发中，以处理垃圾渗滤液中的难处理有机污染物。操作参数的影响表明，pH 值和温度会影响反应速率。将氧化剂 HO 添加到 TiO/ZnO 悬浮液中表明，与 ZnO 相比，TiO 会增加反应速率。通过大大提高处理后渗滤液的再利用效率，垃圾渗滤液的光催化修复技术将支持环境可持续性的目标。在本综述中，强调并讨论了根据其系统相关性和潜在条件、特性、成本效益、必要控制、排放限值、长期环境影响以及未来研究前景，对渗滤液进行最佳光催化处理的选择。
