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首页> 外文期刊>Chemosphere >Recovery of efficient treatment performance in a semi-aerobic aged refuse biofilter when treating landfill leachate: Washing action using domestic sewage
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Recovery of efficient treatment performance in a semi-aerobic aged refuse biofilter when treating landfill leachate: Washing action using domestic sewage

机译：在半好氧的垃圾生物滤池中处理垃圾渗滤液时恢​​复有效的处理性能：使用生活污水的洗涤作用

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Semi-aerobic aged refuse biofilters (SAARB) are known to efficiently remove organic matter, nitrogenous substances, and anions from landfill leachate. However, long-term recirculation of mature landfill leachate inevitably leads to accumulation of pollutants and decreases treatment capacity. In this study, the washing action provided by domestic sewage was used to recover and even enhance the treatment performance of SAARBs treating mature landfill leachate. Three SAARB columns were operated for 300 d after which a "Recirculation-Washing-Recirculation" sequence was followed. In the first recirculation period (22 d), removal of chemical oxygen demand (COD) and total nitrogen (TN) decreased from ca. 90% and 60%, respectively, initially to about 75% and less than 20%, respectively. Thereafter, washing (20 d) of the SAARBs was accomplished by applying domestic sewage. In the subsequent second recirculation period (30 d), the SAARBs were operated at the same hydraulic loading as used initially, but achieved high (ca. 90%) COD and relatively high (ca. 59%-76%) TN removal, including degradation of refractory organic matter such as humic- and fulvic-like substances. Overall, the mechanisms of the treatment performance recovery (including organics degradation and nitrification-denitrification) using domestic sewage can be attributed to three main effects: (1) some accumulated pollutants were washed out, thereby leading to recovery of the adsorption ability of aged refuse; (2) the inhibition of bio-refractory organics stress on microbial activities was mitigated by domestic sewage washing; and (3) the wash out of some accumulated salts (e.g., chloride and sulfate ions) probably helped the microbial activity recover. (C) 2019 Elsevier Ltd. All rights reserved.
机译：半好氧老化垃圾生物过滤器（SAARB）可以有效地从垃圾渗滤液中去除有机物，含氮物质和阴离子。然而，成熟垃圾填埋场渗滤液的长期再循环不可避免地会导致污染物的积累并降低处理能力。在这项研究中，生活污水提供的洗涤作用被用来恢复甚至增强SAARB处理成熟垃圾渗滤液的处理性能。三个SAARB色谱柱操作300 d，然后按照“再循环-洗涤-再循环”的顺序进行。在第一个再循环期（22 d），化学需氧量（COD）和总氮（TN）的去除量从大约1到4降低了。最初分别为90％和60％，分别达到约75％和小于20％。此后，通过施用生活污水完成对SAARB的洗涤（20天）。在随后的第二个再循环周期（30天）中，SAARB在与最初使用的相同的水力负荷下运行，但实现了高（约90％）COD和相对高（约59％-76％）的总氮去除，包括难降解有机物（如腐殖质和黄腐菌样物质）的降解。总体而言，利用生活污水进行处理性能恢复（包括有机物降解和硝化-硝化）的机理可归因于三个主要作用：（1）清除了一些累积的污染物，从而恢复了老化垃圾的吸附能力; （2）生活污水洗涤减轻了生物难降解有机物对微生物活性的抑制作用； （3）洗去一些积累的盐（例如氯离子和硫酸根离子）可能有助于恢复微生物活性。 （C）2019 Elsevier Ltd.保留所有权利。

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