Challenges of suppressing nitrite-oxidizing bacteria in membrane aerated biofilm reactors by low dissolved oxygen control

被引:20
|
作者
Lu, Yan [1 ]
Liu, Tao [1 ]
Niu, Chenkai [1 ]
Duan, Haoran [1 ]
Zheng, Min [1 ]
Hu, Shihu [1 ]
Yuan, Zhiguo [2 ]
Wang, Hui [3 ]
Guo, Jianhua [1 ]
机构
[1] Univ Queensland, Australian Ctr Water & Environm Biotechnol ACWEB, St Lucia, Qld 4072, Australia
[2] City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Peoples R China
[3] SINOPEC Res Inst Petr Proc Co Ltd, Beijing 100083, Peoples R China
基金
澳大利亚研究理事会;
关键词
Nitrite-oxidizing bacteria (NOB); Shortcut nitrogen removal; Anammox; Partial nitritation (PN); Membrane aerated biofilm reactor (MABR); FREE NITROUS-ACID; REAL-TIME CONTROL; PARTIAL NITRITATION/ANAMMOX; PARTIAL NITRIFICATION; SEWAGE-TREATMENT; REMOVAL; AMMONIUM; DENITRIFICATION; OXIDATION; WATER;
D O I
10.1016/j.watres.2023.120754
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Membrane aerated biofilm reactor (MABR) and shortcut nitrogen removal are two types of solutions to reduce energy consumption in wastewater treatment, with the former improving the aeration efficiency and the latter reducing the oxygen demand. However, integrating these two solutions, i.e., achieving shortcut nitrogen removal in MABR, is challenging due to the difficulty in suppressing nitrite-oxidizing bacteria (NOB). In this study, four MABRs were established to demonstrate the feasibility of initiating, maintaining, and restoring NOB suppression using low dissolved oxygen (DO) control, in the presence and absence of anammox bacteria, respectively. Longterm results revealed that the strict low DO (< 0.1 mg/L) in MABR could initiate and maintain stable NOB suppression for more than five months with nitrite accumulation ratio above 90 %, but it was unable to resuppress NOB once they prevailed. Moreover, the presence of anammox bacteria increased the threshold of DO level to maintain NOB suppression in MABRs, but it was still incapable to restore the deteriorated NOB suppression in conjunction with low DO control. Mathematical modelling confirmed the experimental results and further explored the differences of NOB suppression in conventional biofilms and MABR biofilms. Simulation results showed that it is more challenging to maintain stable NOB suppression in MABRs compared to conventional biofilms, regardless of biofilm thickness or influent nitrogen concentration. Kinetic mechanisms for NOB suppression in different types of biofilms were proposed, suggesting that it is difficult to wash out NOB developed in the innermost layer of MABR biofilms because of the high oxygen level and low sludge wasting rate. In summary, this study systematically demonstrated the challenges of NOB suppression in MABRs through both experiments and mathematical modelling. These findings provide valuable insights into the applications of MABRs and call for more studies in developing effective strategies to achieve stable shortcut nitrogen removal in this energy-efficient configuration.
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页数:12
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