Insight into the organic matter degradation enhancement in the bioelectrochemically-assisted sludge treatment wetland: Transformation of the organic matter and microbial community evolution.
Insight into the organic matter degradation enhancement in the bioelectrochemically-assisted sludge treatment wetland: Transformation of the organic matter and microbial community evolution.
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DOI：
10.1016/j.chemosphere.2021.133259
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发表时间：
2021-12
期刊：
影响因子：
8.8
通讯作者：
Shutian Wang;Qingliang Zhao;Junqiu Jiang;Kun Wang
中科院分区：
文献类型：
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作者：
Shutian Wang;Qingliang Zhao;Junqiu Jiang;Kun Wang
污泥处理湿地(STW)已被广泛用于各种污泥的脱水和矿化，但有机物的低降解能力限制了其应用。生物电化学已被证明可以加速有机物的降解，并从污泥中回收生物质能源。在本研究中，构建了生物电化学辅助污泥处理湿地(BE-STW)系统，以确定最常见的降解有机物类型和功能细菌群落。结果表明，生物电化学法对总化学需氧量的去除效果为19%(±0.6)，附加可溶化学需氧量为64.10%(±0.63)，输出电压为0.961 V，功率密度为0.351 W/m~3。BE-STW优先去除污泥中的亲水性和疏水性酸组分。色氨酸类蛋白质和黄腐酸类物质被完全去除，而中性组分和疏水酸组份中芳香族有机物的水解率增加。此外，富集长链胺和甲基亲油促进了有机质的水解性。此外，较高的相对丰度可加速BE-STW系统中芳香族化合物的降解。在BE-STW上阳极生物膜中主要检出土杆菌属细菌(2.48%)。结果表明，生物电化学法可以提高STW中污泥的稳定化程度，加快有机物的降解和水解率，同时还能收获生物电。该技术为提高传统STW系统的效率提供了一条新的途径。
Sludge treatment wetland (STW) has been widely used to dewater and mineralize the various sludge, but the low degradation ability of organic matter can limit its application. Bioelectrochemistry has been proven to accelerate the degradation of organic compounds and recover bioenergy from the sludge. In this study, a bioelectrochemical-assisted sludge treatment wetland (BE-STW) system was constructed to determine the most common types of degraded organic matter and the functional bacterial community. It was found that the bioelectrochemistry process contributed to a further removal of the total chemical oxygen demand (TCOD) by 19% (±0.6) and the additional soluble chemical oxygen demand (SCOD) value was 64.10% (±0.63), with a voltage output of 0.961 V and a power density of 0.351 W/m3. The hydrophilic and hydrophobic acid fractions of the sludge were preferentially removed in BE-STW. The tryptophan-like protein and fulvic acid-like substances were totally removed, whereas, the hydrolysis of aromatic organic compounds in the neutral and hydrophobic acid fractions was enhanced. Also, the enrichment ofLongilineaandMethylophilusimproved the hydrolysis of organic matter. Moreover, the high relative abundance ofThauera,Dechloromonas, andSyntrophorhabduscould accelerate the degradation of aromatic compounds in the BE-STW system. The bacteria from the genusGeobacterwas predominantly detected (2.48%) in the anodic biofilm on BE-STW. The results showed that bioelectrochemistry could improve the sludge stabilization degree in STW, accelerate the organic matter degradation and hydrolysis efficiency, and harvest bioelectricity, simultaneously. This technology can provide a new pathway to increase the efficiency of the traditional STW systems.