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首页> 外文OA文献 >Recycling of Reverse Osmosis Concentrates to the Membrane Bioreactor in the MBR-RO Process for Water Reuse: effect on mbr performances
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Recycling of Reverse Osmosis Concentrates to the Membrane Bioreactor in the MBR-RO Process for Water Reuse: effect on mbr performances

机译：反渗透反渗透的回收浓缩到MBR-RO过程中的膜生物反应器，用于水再利用：对MBR性能的影响

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Wastewater effluents can be treated by an integrated membrane system combining membrane bioreactor (MBR) and reverse osmosis (RO) for effective removal of micropollutants in the field of high-quality water reuse. However, discharging the RO concentrate waste stream directly into the natural environment could lead to serious problems due to the toxic components contained in the concentrates (micropollutants, salts, organic matter). A possible solution could be the recirculation of RO concentrate waste to the MBR. However, such an operation should be studied in detail since the recirculation of non-biodegradable organic matter or high concentrations of salts and micropollutants could directly or indirectly contribute to MBR membrane fouling and modification of the biodegradation activity. In this context, the work reported here focused on the recirculation of such concentrates in an MBR, paying specific attention to MBR membrane fouling. Lab-scale experiments were performed on a continuous MBR-RO treatment line with RO concentrate recirculation. The main goal was to determine the recovery of the RO unit and of the global process that maintained good process performance in terms of biodegradation and MBR fouling. The results demonstrate that the impact of the toxic flow on activated sludge depends on the recovery of the RO step but the same trends were observed regardless of the organic matter and salt contents of the concentrates: the concentration of proteins increased slightly. Size-exclusion high performance liquid chromatography (HPLC-SEC) was employed to study the effects of RO concentrate on the production of protein-like soluble microbial products (SMPs) and demonstrated a significant peak of protein-like substances corresponding to 10-100 kDa and 100-1 000 kDa molecules in the supernatant. Thus a significant increase in the propensity for sludge fouling was observed, which could be attributed to the increased quantity of protein-like substances. Finally, the effect of the concentrate on sludge activity was studied and no significant effect was observed on biodegradation, indicating that the return of the concentrate to the MBR could be a good alternative.
机译：废水污水可以通过组合膜生物反应器（MBR）的集成膜系统和反渗透（RO）进行治疗，以有效去除高质量的水再利用领域的微孔子。然而，将RO浓缩物流量直接排放到自然环境中可能导致浓缩物中含有的有毒成分（微污染物，盐，有机物质）引起的严重问题。可能的溶液可以是RO浓缩废料对MBR的再循环。然而，应该详细研究这种操作，因为不可生物降解的有机物或高浓度的盐和微拷贝分离可以直接或间接地有助于MBR膜污染和生物降解活性的改性。在这种情况下，这里报道的工作重点是在MBR中重新循环此类浓缩物，对MBR膜污染造成特别的注意。在具有RO浓缩液再循环的连续MBR-RO处理管线上进行实验室规模的实验。主要目标是确定RO单位的恢复以及在生物降解和MBR污染方面保持良好的过程性能的全球进程。结果表明，毒性流动对活性污泥的影响取决于RO步骤的回收率，但无论浓缩物的有机物质和盐含量如何，观察到相同的趋势：蛋白质的浓度略微增加。尺寸排除高效液相色谱（HPLC-SEC）用于研究RO浓缩物对蛋白质可溶性微生物产品（SMPS）的产生，并证明了对应于10-100kDa的蛋白质物质的显着峰值和上清液中100-1000kDa分子。因此，观察到污泥污垢倾向的显着增加，这可能归因于蛋白质样物质的量增加。最后，研究了浓缩物对污泥活性的影响，并且在生物降解中没有观察到显着效果，表明浓缩物对MBR的返回可能是一个很好的替代方案。

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