Long-term operation performance and fouling behavior of a high-solid anaerobic membrane bioreactor in treating food waste
Long-term operation performance and fouling behavior of a high-solid anaerobic membrane bioreactor in treating food waste
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DOI：
10.1016/j.cej.2020.124918
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发表时间：
2020-08-15
影响因子：
15.1
通讯作者：
Li, Yu-You
中科院分区：
文献类型：
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作者：
Cheng, Hui;Li, Yemei;Li, Yu-You
采用高固体分厌氧膜生物反应器（AnMBR）连续运行处理餐厨垃圾，研究了AnMBR的运行性能和膜污染行为。最佳甲烷产率为0.57 +/- 0.08 L-CH 4/g-VSin，有机负荷（OLR）为6.00 +/- 0.59 g-VS/L/d，表明AnMBR可实现餐厨垃圾的高效甲烷发酵。采用串联阻力模型描述了不同污染组分的阻力特性，揭示了不同过滤方式下的污染行为。结果表明，在低过滤/松弛比（F/R）下，有机物堵塞是主要的污垢，占总阻力的60%。当F/R比增大时，滤饼层占总阻力的54%，是污垢的主要控制层。为了更好地了解膜污染行为，饼污泥的特性进行了研究，并与散装污泥进行了比较。溶解性有机物（DOM）分析表明，可溶性微生物副产物在高固体AnMBR膜污染中起着重要的作用，如芳香蛋白。本研究深入了解了高固体分AnMBR处理餐厨垃圾的膜污染行为，并提出了不同过滤模式下最适宜的膜清洗方法，以期为高固体分AnMBR的设计、运行和进一步应用提供参考。
A high-solid anaerobic membrane bioreactor (AnMBR) treating food waste was continuously operated to investigate AnMBR performance and membrane fouling behavior. The optimal methane yield of 0.57 +/- 0.08 L-CH4/g-VSin and organic loading rate (OLR) of 6.00 +/- 0.59 g-VS/L/d indicated that a high-rate methane fermentation of food waste was achieved by the AnMBR. The resistance-in-series (RIS) model was applied to delineate the resistances of different fouling fractions and elucidate fouling behavior under different filtration modes. The results showed that organic pore blocking was the dominant fouling at the low filtration to relaxation (F/R) ratio, accounting for 60% of the total resistance. By contrast, the cake layer governed the fouling when the F/R ratio became larger, accounting for 54% of the total resistance. To better understand membrane fouling behavior, the characteristics of cake sludge were investigated and compared with those of bulk sludge. Dissolved organic matter (DOM) analysis revealed that soluble microbial by-products played a comparably significant role as aromatic protein in membrane fouling in the high-solid AnMBR. This work provided a deep understanding of the membrane fouling behavior of a high-solid AnMBR in treating food waste and proposed the most appropriate membrane cleaning methods under different filtration modes, which is expected to contribute to the design, operation and further application of the high-solid AnMBR.