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Effects of solids retention time on the biological performance of a novel microalgal-bacterial membrane photobioreactor for industrial wastewater treatment
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2021-04-14 , DOI: 10.1016/j.jece.2021.105500
Meijia Zhang , Kam-Tin Leung , Hongjun Lin , Baoqiang Liao

Microalgal-bacterial membrane photobioreactor (MB-MPBR) takes the distinctive advantage of simultaneously removing nutrients and organics from sewage in a single step, which might be a promising technology for the treatment of industrial anaerobic digestion effluent with high strength organics and nutrients. The feasibility of using MB-MPBR to treat industrial anaerobic digestion effluent was studied at three solids retention time (SRT) for almost 300 days. The results showed that the total biomass concentration was positively correlated with SRT, increasing from 1.34 ± 0.32 g/L at SRT of 10 d to 3.40 ± 0.15 g/L at SRT of 30 d. However, the growth status of microalgae was nonlinearly correlated to SRT and the highest microalgae content was observed at SRT of 20 d. The removal of chemical oxygen demand maintained constant in the range of 90%-94%, while the nitrogen and phosphorus removals significantly changed with SRT. The highest removal of total nitrogen (19.26 ± 4.58%) and total phosphorus (54.95 ± 4.36%) was found at SRT of 20 and 30 d, respectively. Moreover, the flocs size and micromorphology of the microalgal-bacterial flocs were greatly affected by SRT. Overall, MB-MPBR is a capable technique to simultaneously remove organics and nutrients from high-strength anaerobic digestion effluent. However, high concentration of nutrients in the feed and improper SRT value negatively impacted the microalgae growth and nutrients removal, which led to the dissatisfactory effluent quality. Therefore, influent dilution, a longer hydraulic retention time and intermediate SRT is required to achieve high-quality permeate fulfills the discharge standards.



中文翻译:

固体保留时间对新型微藻细菌膜光生物反应器处理工业废水的生物学性能的影响

微藻细菌膜光生物反应器(MB-MPBR)的独特优势是可以一步一步地同时去除污水中的营养物和有机物,这对于处理具有高强度有机物和营养物的工业厌氧消化废水可能是一种有前途的技术。使用MB-MPBR处理工业厌氧消化废水的可行性在三个固体停留时间(SRT)进行了将近300天。结果表明,总生物量浓度与SRT呈正相关,从 10 d时的1.34±0.32 g / L增加到3.40±0.15。 30 d SRT时的g / L。然而,微藻的生长状态与SRT呈非线性关系,并且在20 d的SRT上观察到了最高的微藻含量。化学需氧量的去除保持恒定在90%-94%的范围内,而氮和磷的去除量随SRT的变化而显着变化。在SRT分别为20和30 d时,总氮(19.26±4.58%)和总磷(54.95±4.36%)的去除率最高。而且,微藻-细菌絮凝物的絮凝物大小和微观形态受SRT影响很大。总体而言,MB-MPBR是一种能够同时去除高强度厌氧消化废水中有机物和营养物质的技术。但是,饲料中营养物质的浓度高和SRT值不正确会对微藻的生长和营养物质的去除产生负面影响,导致出水水质不佳。因此,需要进水稀释,更长的水力停留时间和中间的SRT,以实现满足排放标准的高质量渗透液。

更新日期:2021-04-14
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