Impacts of morphology on fouling propensity in a membrane bioreactor based on thermodynamic analyses
Impacts of morphology on fouling propensity in a membrane bioreactor based on thermodynamic analyses
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基于热力学分析的形态对膜生物反应器结垢倾向的影响
DOI：
10.1016/j.jcis.2018.07.030
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发表时间：
2018
影响因子：
9.9
通讯作者：
Hongjun Lin
中科院分区：
文献类型：
--
作者：
Xiang Cai;Genying Yu;Huachang Hong;Yiming He;Liguo Shen;Hongjun Lin
通过热力学分析，探讨了膜形态和污物形态对膜生物反应器(MBR)中粘着污染相互作用能的影响。根据热力学方法，定量计算了在本研究条件下不同膜和污物形态下三种可能的相互作用情景下的相互作用能。有趣的是，在相同条件下，可溶微生物产物(SMPS)与粗糙膜之间的总相互作用强度是污泥絮体与粗糙膜之间的2万多倍，表明SMPS的附着能力极强于大颗粒污染物。这一结果合理地解释了SMPS对污泥絮体的高污染倾向。与光滑表面相比，粗糙的膜表面和污泥絮体表面显著降低了总的相互作用强度，减轻了污泥絮体造成的粘附性污染。降低膜的分维增加了SMPS引起的附着污染，但减轻了污泥絮体引起的附着污染。这些发现对更好地理解和控制膜生物反应器中的膜污染具有重要意义。
Impacts of morphologies of both membrane and foulant on interaction energies related with adhesive fouling in a membrane bioreactor (MBR) were explored by thermodynamic analyses. Interaction energies in three possible interaction scenarios regarding different membrane and foulant morphologies under conditions in this study were quantified according to the thermodynamic methods. It was interestingly found that, strength of total interaction between soluble microbial products (SMPs) and rough membrane was over 20,000 times of that between sludge flocs and rough membrane under same conditions, indicating the extremely higher adhesion ability of SMPs than the large particulate foulants. This result plausibly explained the high fouling propensity of SMPs over sludge flocs. As compared with smooth surfaces, rough surfaces of both membrane and sludge flocs significantly reduced total interaction strength, alleviating adhesive fouling caused by the sludge flocs. Reduce in fractal dimension (Df) of membrane increased adhesive fouling caused by the SMPs, but alleviated adhesive fouling caused by the sludge flocs. These findings gave important implications to better understand and control membrane fouling in MBRs.