Enhanced landfill leachate treatment in sequencing batch biofilm reactors ( SBBRs ) amended with zeolite and biochar
Enhanced landfill leachate treatment in sequencing batch biofilm reactors ( SBBRs ) amended with zeolite and biochar
复制标题
用沸石和生物炭改进的序批式生物膜反应器（ SBBR ）中强化垃圾渗滤液处理
DOI：
10.1002/jctb.6964
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发表时间：
2022
影响因子：
3.4
通讯作者：
Ergas, Sarina J
中科院分区：
文献类型：
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作者：
Gao, Bisheng;Yang, Xia;Dasi, Erica A;Lam, Thanh;Arias, Mauricio E;Ergas, Sarina J
垃圾渗滤液的生物处理受到高浓度氨氮和难降解有机物的抑制。研究了在序批式生物膜反应器（SBBR）中添加天然吸附材料沸石（斜发沸石）和生物炭强化垃圾渗滤液生物处理的效果。用不同类型的生物膜支撑介质建立了三个实验室规模的SBBR：（i）轻质膨胀粘土骨料（LECA）作为对照（C-SBBR）;（ii）LECA +沸石（CZ-SBBR）;和（iii）LECA +沸石+生物炭（CZB-SBBR）。SBBR交替缺氧和好氧阶段运行，以促进总氮（TN）通过硝化/反硝化去除。在整个研究过程中，所有三个SBBR都实现了出色的TAN去除率（>99%），这很可能是由于有利的环境条件和较长的水力停留时间（HRT）（9天或更长）。在CZB-SBBR中添加生物炭导致与C-SBBR（COD为42-44%，颜色为28-33%）和CZ-SBBR（COD为34-45%，颜色为20-35%）相比显着更高的化学需氧量（COD）（61-83%）和颜色（82-95%，作为UV 456）去除。最初在CZB-SBBR中观察到高流出物硝酸盐（NO3−）浓度，最有可能是由于用于反硝化的有机碳有限。然而，经过>1年的运行，NO3−积累下降，TN去除率达到81%，表明主要的脱氮途径从同步硝化/反硝化转向部分亚硝化/厌氧氨氧化。© 2021化学工业协会（SCI）。
BACKGROUNDBiological treatment of landfill leachate is inhibited by high concentrations of ammonia and recalcitrant organic matter. This study investigated the addition of natural adsorbent materials, zeolite (clinoptilolite) and biochar, to enhance biological treatment of landfill leachate in sequencing batch biofilm reactors (SBBRs). Three bench‐scale SBBRs were set up with varying types of biofilm support media: (i) lightweight expanded clay aggregate (LECA) as a control (C‐SBBR); (ii) LECA + zeolite (CZ‐SBBR); and (iii) LECA + zeolite + biochar (CZB‐SBBR). SBBRs were operated with alternating anoxic and aerobic stages to promote total nitrogen (TN) removal via nitrification/denitrification.RESULTSExcellent TAN removal (>99%) was achieved in all three SBBRs throughout the study, most likely as a result of the favorable environmental conditions and long hydraulic retention time (HRTs) applied (nine or more days). Biochar addition in CZB‐SBBR resulted in significantly higher chemical oxygen demand (COD) (61–83%) and color (82–95% as UV456) removals compared with C‐SBBR (42–44% for COD and 28–33% for color) and CZ‐SBBR (34–45% for COD and 20–35% for color). High effluent nitrate (NO3−) concentrations initially were observed in CZB‐SBBR, most likely due to limited organic carbon availability for denitrification. However, after >1 year of operation, NO3−accumulation declined and TN removal of 81% was achieved, indicating that the main nitrogen removal pathway shifted from simultaneous nitrification/denitrification to partial nitritation/anammox.CONCLUSIONSZeolite/biochar amended SBBRs are a promising approach for enhanced landfill leachate treatment. © 2021 Society of Chemical Industry (SCI).