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Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

机译：在潜水膜生物反应器中添加生物絮凝剂可减少膜污染并改善污泥特性

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摘要

The effectiveness of a green bioflocculant (Gemfloc (R)) on enhanced performance of a submerged membrane bioreactor (SMBR) was evaluated in terms of membrane fouling reduction and sludge characterization. Two MBRs were operated parallelly in this study, namely conventional MBR (CMBR) and MBR with Gemfloc (R) addition (MBR-G). Results showed mitigated membrane fouling through Gemfloc (R) addition in terms of cake layer formation and pore blocking. When compared to the CMBR, in spite of more extracellular polymeric substances (EPS) presented in activated sludge, the MBR-G demonstrated less soluble microbial products (SMP), larger sludge flocs, higher zeta potential and greater relative hydrophobicity of sludge flocs, which decreased cake layer resistance and pore blocking resistance. The reduced cake layer resistance in the MBR-G could be also ascribed to less growth of suspended biomass, lower sludge viscosity, as well as less EPS, SMP and biopolymer clusters in the cake layer. In addition, a modified resistance-in-series model was employed by considering SMP and mixed liquor suspended solids. The simulated results implied that the model could predict the influence of sludge characteristics on membrane fouling behavior of the SMBR. (C) 2015 Elsevier B.V. All rights reserved.
机译：就减少膜污染和污泥特性而言，评估了绿色生物絮凝剂（Gemfloc（R））对增强膜生物反应器（SMBR）性能的有效性。在这项研究中，两个MBR并行运行，即常规MBR（CMBR）和添加了Gemfloc（R）的MBR（MBR-G）。结果显示，就滤饼层形成和孔堵塞而言，通过添加Gemfloc（R）减轻了膜的结垢。与CMBR相比，尽管活性污泥中存在更多的细胞外聚合物质（EPS），但MBR-G仍显示出较低的微生物产物（SMP），较大的污泥絮凝，更高的Zeta电位和较大的相对疏水性，这些降低了滤饼层的抗性和抗孔堵塞性。 MBR-G中降低的滤饼层阻力还可能归因于滤饼层中悬浮生物量的增长减少，污泥粘度降低以及EPS，SMP和生物聚合物簇较少。此外，通过考虑SMP和混合液悬浮固体，采用了改进的串联电阻模型。仿真结果表明该模型可以预测污泥特性对SMBR膜结垢行为的影响。 （C）2015 Elsevier B.V.保留所有权利。

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