Bagastyo Arseto Yekti, Hidayati Arum Sofiana, Herumurti Welly, Nurhayati Ervin
Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Indonesia 60111 E-mail:
Water Sci Technol. 2021 Mar;83(6):1357-1368. doi: 10.2166/wst.2021.060.
Conventional biological treatments used in most Indonesian landfill sites are mostly ineffective in treating stabilized landfill leachates to meet the standard regulation. Thus, a combination of biological and electrochemical process is offered to successfully treat leachates containing a high concentration of organic and nitrogenous compounds. In this study, a moving bed biofilm reactor (MBBR) was applied prior to electrochemical oxidation by using boron-doped diamond (BDD), Ti/IrO, and Ti/Pt anodes with applied current of 350, 400 and 450 mA. The objectives were to investigate the effect of anode type and the applied current on the removal of organics as well as total nitrogen from the MBBR-treated leachate with electrochemical oxidation. The optimum removal of chemical oxygen demand (COD) observed on the Ti/Pt anode was 78% by applying 400 mA, with an estimated energy of 56.7 Wh g L. In the case of Ti/IrO and BDD anodes, the optimum removal of COD was 76 and 85% with an energy consumption of 58.9 and 36.9 Wh g L, respectively, both achieved at 350 mA. Although all anodes showed less-satisfactory performances for total nitrogen reduction, around 46-95% removal of nitrogenous compounds was achieved by MBBR, with their partial conversion to nitrates.
大多数印度尼西亚垃圾填埋场使用的传统生物处理方法在处理稳定化垃圾渗滤液以达到标准规定方面大多无效。因此，提供了一种生物和电化学工艺相结合的方法来成功处理含有高浓度有机和含氮化合物的渗滤液。在本研究中，在使用掺硼金刚石（BDD）、Ti/IrO和Ti/Pt阳极进行电化学氧化之前，先应用了移动床生物膜反应器（MBBR），施加电流分别为350、400和450 mA。目的是研究阳极类型和施加电流对通过电化学氧化从MBBR处理后的渗滤液中去除有机物以及总氮的影响。在Ti/Pt阳极上，通过施加400 mA电流，化学需氧量（COD）的最佳去除率为78%，估计能量为56.7 Wh g L。对于Ti/IrO和BDD阳极，在350 mA电流下，COD的最佳去除率分别为76%和85%，能量消耗分别为58.9和36.9 Wh g L。尽管所有阳极在总氮还原方面的表现都不尽人意，但MBBR实现了约46 - 95%的含氮化合物去除，部分转化为硝酸盐。
