Advanced methanogenic performance and fouling mechanism investigation of a high-solid anaerobic membrane bioreactor (AnMBR) for the co-digestion of food waste and sewage sludge
Advanced methanogenic performance and fouling mechanism investigation of a high-solid anaerobic membrane bioreactor (AnMBR) for the co-digestion of food waste and sewage sludge
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DOI：
10.1016/j.watres.2020.116436
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发表时间：
2020-12-15
期刊：
影响因子：
12.8
通讯作者：
Li, Yu-You
中科院分区：
文献类型：
--
作者：
Cheng, Hui;Li, Yemei;Li, Yu-You
污水污泥的处理已成为世界范围内亟待解决的问题。为解决这一问题，采用高固体分厌氧膜生物反应器（AnMBR）对硒和餐厨垃圾（FW）进行厌氧共消化（AcoD）。本研究调查了SeS比率对AcoD产甲烷性能的影响，其中从0到25%、50%、75%和100%（基于总固体）逐渐增加值。结果表明，在单一FW消化时，产甲烷性能最高。对于共消化，FW/SeS的最佳配比为75%：25%。在此最佳混合比例下，沼气产率和甲烷产率分别为0. 498 L-bogas/g-CODfed和0. 295 L-CH 4/g-CODfed，比单一SeS消化分别提高了67.7%和67.6%。提高值归因于提高水解率（8.14%）和平衡的碳/氮（C/N）比与FW共消化，协同刺激产甲烷率81.0%。考察了连续膜过滤性能，测定了不同污染程度下的4条典型跨膜压（TMP）变化曲线。当混合液总固体浓度为25 ~ 30 g/L时，膜的通量可达6 L/m2/h（LMH）。首次将连续膜过滤特性、混合液粒径分布和外力分析相结合，揭示了高固体分AnMBR的膜污染机理。本研究的结果将有助于建立一个有效的FW和SeS治疗策略。(c)2020爱思唯尔有限公司保留所有权利。
Disposal of the increasingly huge amounts of sewage sludge (SeS) has become an impending problem worldwide. To solve this problem, a high-solid anaerobic membrane bioreactor (AnMBR) was used for the anaerobic co-digestion (AcoD) of SeS and food waste (FW). This study investigated the effects of SeS ratio on the methanogenic performance of the AcoD with a gradual increase value from 0 to 25%, 50%, 75% and 100% (total solids based). The results showed that the highest methanogenic performance was achieved at mono FW digestion. As for the co-digestion, the optimal FW/SeS ratio for methanogenic performance was 75%:25% among all the mixing ratios. The COD based biogas yield and methane yield were 0.498 L-biogas/g-CODfed and 0.295 L-CH4/g-CODfed at this optimal mixing ratio, which were 67.7% and 67.6% higher than those of the mono SeS digestion, respectively. The upgraded values were attributed to the improved hydrolysis ratio (by 8.14%) and the balanced carbon-to-nitrogen (C/N) ratio by co-digestion with FW, which synergistically stimulated methanogenesis ratio by 81.0%. The continuous membrane filtration property was investigated and four typical trans-membrane pressure (TMP) variation curves at different fouling degrees were determined. The membrane could sustainably operate at a flux of 6 L/m(2)/h (LMH) at the mixed liquor total solids (MLTS) concentration of 25 30 g/L. The combination of continuous membrane filtration property, particle size distribution of the mixed liquor and the external forces analysis was firstly applied to unravel the membrane fouling mechanism of a high-solid AnMBR. The result of this study will contribute to the establishment of an efficient FW and SeS treatment strategy. (c) 2020 Elsevier Ltd. All rights reserved.