Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.
Chemosphere. 2020 Mar;242:125256. doi: 10.1016/j.chemosphere.2019.125256. Epub 2019 Oct 31.
Ultraviolet-quenching substances (UVQS), recently identified pollutants in landfill leachate, can interfere with ultraviolet disinfection when landfill leachate is co-treated with municipal sewage. This study investigated the elimination of UVQS in mature landfill leachates through a membrane bioreactor (MBR) and a semi-aerobic aged refuse biofilter (SAARB). Humus (i.e., fulvic and humic acids) was the main component of organic matter in both MBR- and SAARB-treated landfill leachates, while there was a more stable chemical structure of humus in the MBR-treated leachate. The concentration of UVQS in MBR-treated mature landfill leachate was higher than that of SAARB-treated leachate. Ozonation can degrade UVQS effectively, especially for landfill leachate containing a high concentration UVQS (i.e., MBR-treated landfill leachate). However, a large accumulation of small molecule acid might be caused by ozonation for highly concentrated UVQS in landfill leachate, leading to the delayed degradation of total organic carbon. Moreover, ozonation degraded both fulvic acid and humic acid; and degraded humic acid more effectively. For instance, 88.0% removal (MBR-CP2) and 96.0% removal (SAARB-CP2) of humic acid was higher than those (83.3% for MBR-CP1 and 92.3% for SAARB-CP1) of fulvic acid. The destruction of UV-quenching functional groups of organics (such as CC) by ozone was the main UVQS degradation mechanism of ozonation applied to MBR- and SAARB-treated landfill leachates. Therefore, the ozonation process can efficiently decrease UV absorption intensity in both MBR- and SAARB-treated landfill leachates.
紫外猝灭物质（UVQS）是最近在垃圾渗滤液中发现的污染物，当垃圾渗滤液与城市污水共同处理时，可能会干扰紫外线消毒。本研究通过膜生物反应器（MBR）和半好氧老化垃圾生物滤池（SAARB）来研究成熟垃圾渗滤液中 UVQS 的消除。腐殖质（即富里酸和腐殖酸）是 MBR 和 SAARB 处理的垃圾渗滤液中有机物的主要成分，而 MBR 处理的渗滤液中的腐殖质具有更稳定的化学结构。MBR 处理的成熟垃圾渗滤液中 UVQS 的浓度高于 SAARB 处理的渗滤液。臭氧氧化可以有效地降解 UVQS，特别是对于含有高浓度 UVQS 的垃圾渗滤液（即 MBR 处理的垃圾渗滤液）。然而，对于高浓度 UVQS 的垃圾渗滤液，臭氧氧化可能会导致大量小分子酸的积累，从而导致总有机碳的降解延迟。此外，臭氧氧化降解了富里酸和腐殖酸，并且对腐殖酸的降解更为有效。例如，腐殖酸的去除率（MBR-CP2）为 88.0%，（SAARB-CP2）为 96.0%，高于富里酸的去除率（MBR-CP1 为 83.3%，SAARB-CP1 为 92.3%）。臭氧对有机物（如 CC）的紫外猝灭功能基团的破坏是臭氧用于 MBR 和 SAARB 处理的垃圾渗滤液中 UVQS 降解的主要机制。因此，臭氧氧化过程可以有效地降低 MBR 和 SAARB 处理的垃圾渗滤液中的紫外吸收强度。
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