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Bioaugmentation of intertidal sludge enhancing the development of salt-tolerant aerobic granular sludge.
机构信息
National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China.
National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China.
出版信息
J Environ Manage. 2023 Jan 1;325(Pt B):116394. doi: 10.1016/j.jenvman.2022.116394. Epub 2022 Oct 31.
Three parallel bioreactors were operated with different inoculation of activated sludge (R1), intertidal sludge (ItS) (R2), and ItS-added AS (R3), respectively, to explore the effects of ItS bioaugmentation on the formation of salt-tolerant aerobic granular sludge (SAGS) and the enhancement of COD removal performance. The results showed that compared to the control (R1-2), R3 promoted a more rapid development of SAGS with a cultivation time of 25 d. Following 110-day cultivation, R3 exhibited a higher granular diameter of 1.3 mm and a higher hydrophobic aromatic protein content than that in control. Compared to the control, the salt-tolerant performance in R3 was also enhanced with the COD removal efficiency of 96.4% due to the higher sludge specific activity of 14.4 g·gVSS·d and the salinity inhibition constant of 49.3 gL. Read- and genome-resolved metagenomics together indicated that a higher level of tryptophan/tyrosine synthase gene (trpBD, tyrBC) and enrichment of the key gene hosts Rhodobacteraceae, Marinicella in R3, which was about 5.4-fold and 1.4-fold of that in control, could be the driving factors of rapid development of SAGS. Furthermore, the augmented salt-tolerant potential in R3 could result from that R1 was dominated by Rhodospirillaceae, Bacteroidales, which carried more trehalose synthase gene (otsB, treS), while the dominant members Rhodobacteraceae, Marinicella in R3 were main contributors to the glycine betaine synthase gene (ectC, betB, gbsA). This study could provide deeper insights into the rapid development and improved salt-tolerant potential of SAGS via bioaugmentation of intertidal sludge, which could promote the application of hypersaline wastewater treatment.
三个平行的生物反应器分别采用不同的接种物（活性污泥 R1、潮间带污泥 ItS（R2）和添加 ItS 的 AS（R3））进行操作，以探讨 ItS 生物强化对耐盐好氧颗粒污泥（SAGS）形成和 COD 去除性能提高的影响。结果表明，与对照（R1-2）相比，R3 促进了 SAGS 的更快发展，培养时间为 25d。经过 110 天的培养，R3 的颗粒直径为 1.3mm，疏水性芳香族蛋白含量高于对照。与对照相比，R3 的耐盐性能也得到了增强，COD 去除效率达到 96.4%，这是由于污泥比活性较高，为 14.4g·gVSS·d，盐度抑制常数为 49.3gL。读谱和基因组解析宏基因组学共同表明，R3 中色氨酸/酪氨酸合成酶基因（trpBD、tyrBC）水平较高，关键基因宿主红杆菌科、海洋单胞菌的丰度增加，分别是对照的 5.4 倍和 1.4 倍，这可能是 SAGS 快速发展的驱动因素。此外，R3 中增强的耐盐潜力可能是由于 R1 以红螺旋菌科、拟杆菌目为主，携带更多海藻糖合成酶基因（otsB、treS），而 R3 中的主要成员红杆菌科、海洋单胞菌是甘氨酸甜菜碱合成酶基因（ectC、betB、gbsA）的主要贡献者。本研究为通过潮间带污泥生物强化快速开发和提高 SAGS 的耐盐潜力提供了更深入的认识，这将促进高盐废水处理的应用。
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