Direct membrane filtration (DMF) for recovery of organic matter in municipal wastewater using small amounts of chemicals and energy
Direct membrane filtration (DMF) for recovery of organic matter in municipal wastewater using small amounts of chemicals and energy
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DOI：
10.1016/j.chemosphere.2021.130244
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发表时间：
2021-03-31
期刊：
影响因子：
8.8
通讯作者：
Hafuka, Akira
中科院分区：
文献类型：
--
作者：
Kimura, Katsuki;Yamakawa, Mutsumi;Hafuka, Akira
城市废水中有机物的回收和利用对于建立可持续发展的社会至关重要，因此这些因素最近引起了极大的关注。通过直接膜过滤（DMF）浓缩有机物，然后进行厌氧消化，比通过厌氧工艺如厌氧膜生物反应器（AnMBR）处理整个废水更有利。然而，在DMF中发生严重的膜污染是一个问题。在这项研究中，DMF进行了现有的污水处理厂，试图长期运行。膜组件的振动、短期曝气和化学增强曝气（CEB）的组合，具有多种化学品（即，柠檬酸和NaClO的替代使用）被发现对于减轻DMF中的膜污染是有效的。此外，切换进料从进水到出水在初级沉淀池中显着减轻膜污染。在这项研究中，其中微滤膜，具有0.1毫米的标称孔径，被使用，类似于75%的原废水中的有机物被回收，与废水的体积浓度的50或150倍。DMF回收的有机物比同一污水处理厂产生的剩余污泥具有更高的沼气生产潜力。能源平衡分析（即，用于DMF并由DMF回收的能量）表明，所提出的DMF可以从具有典型强度（化学需氧量为500 mg/L）的1 m3原废水中产生类似于0.3kWh的净正电量。(C)2021爱思唯尔有限公司保留所有权利。
The recovery and utilization of organic matter in municipal wastewater are essential for the establishment of a sustainable society, such that these factors have drawn significant recent attention. The upconcentration of organic matter via direct membrane filtration (DMF), followed by anaerobic digestion, is advantageous over the treatment of the entire wastewater by an anaerobic process, such as an anaerobic membrane bioreactor (AnMBR). However, the occurrence of severe membrane fouling in the DMF is a problem. In this study, DMF was carried out at an existing wastewater treatment plant to attempt long-term operation. A combination of vibration of membrane modules, short-term aeration, and chemically enhanced backwash (CEB), with multiple chemicals (i.e., the alternative use of citric acid and NaClO), was found to be effective for the mitigation of membrane fouling in DMF. Furthermore, switching the feed from influents to effluents in the primary sedimentation basin significantly mitigated membrane fouling. In this study, in which microfiltration membrane, with a nominal pore size of 0.1 mm, was used, similar to 75% of the organic matter in raw wastewater was recovered, with the volumetric concentration of wastewater by 50- or 150-fold. Organic matter recovered by DMF had significantly higher potentials for biogas production than the excess sludge generated from the same wastewater treatment plant. An analysis of the energy balance (i.e., the energy used for DMF and recovered by DMF) suggests that the proposed DMF can produce a net-positive amount of electricity of similar to 0.3 kWh from 1 m(3) of raw wastewater with a typical strength (chemical oxygen demand of 500 mg/L). (C) 2021 Elsevier Ltd. All rights reserved.