Typical Heterotrophic and Autotrophic Nitrogen Removal Process Coupled with Membrane Bioreactor: Comparison of Fouling Behavior and Characterization.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-10-07 DOI:10.3390/membranes14100214
Qiushan Liu, Tong Zhou, Yuru Liu, Wenjun Wu, Yufei Wang, Guohan Liu, Na Wei, Guangshuo Yin, Jin Guo
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Abstract

There is limited research on the relationship between membrane fouling and microbial metabolites in the nitrogen removal process coupled with membrane bioreactors (MBRs). In this study, we compared anoxic-oxic (AO) and partial nitritation-anammox (PNA), which were selected as representative heterotrophic and autotrophic biological nitrogen removal-coupled MBR processes for their fouling behavior. At the same nitrogen loading rate of 100 mg/L and mixed liquor suspended solids (MLSS) concentration of 4000 mg/L, PNA-MBR exhibited more severe membrane fouling compared to AO-MBR, as evidenced by monitoring changes in transmembrane pressure (TMP). In the autotrophic nitrogen removal process, without added organic carbon, the supernatant of PNA-MBR had higher concentrations of protein, polysaccharides, and low-molecular-weight humic substances, leading to a rapid flux decline. Extracellular polymeric substances (EPS) extracted from suspended sludge and cake sludge in PNA-MBR also contributed to more severe membrane fouling than in AO-MBR. The EPS subfractions of PNA-MBR exhibited looser secondary structures in protein and stronger surface hydrophobicity, particularly in the cake sludge, which contained higher contents of humic substances with lower molecular weights. The higher abundances of Candidatus Brocadia and Chloroflexi in PNA-MBR could lead to the production of more hydrophobic organics and humic substances. Hydrophobic metabolism products as well as anammox bacteria were deposited on the hydrophobic membrane surface and formed serious fouling. Therefore, hydrophilic membrane modification is more urgently needed to mitigate membrane fouling when running PNA-MBR than AO-MBR.

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与膜生物反应器耦合的典型异养和自养脱氮过程:污垢行为和特征的比较。
关于膜生物反应器(MBR)耦合脱氮过程中膜污垢与微生物代谢物之间关系的研究十分有限。在本研究中,我们比较了缺氧-缺氧(AO)和部分亚硝酸盐化-anammox(PNA)的污垢行为,这两种工艺被选为具有代表性的异养和自养生物脱氮耦合 MBR 工艺。在相同的氮负荷率(100 毫克/升)和混合液悬浮固体(MLSS)浓度(4000 毫克/升)条件下,PNA-MBR 与 AO-MBR 相比表现出更严重的膜堵塞,这可以通过监测跨膜压力(TMP)的变化来证明。在不添加有机碳的自养脱氮过程中,PNA-MBR 的上清液中蛋白质、多糖和低分子量腐殖质的浓度较高,导致通量迅速下降。与 AO-MBR 相比,PNA-MBR 中从悬浮污泥和饼状污泥中提取的胞外高分子物质(EPS)也导致了更严重的膜堵塞。PNA-MBR 的 EPS 子馏分的蛋白质二级结构更松散,表面疏水性更强,尤其是在饼状污泥中,含有更多分子量较低的腐殖质。在 PNA-MBR 中,Candidatus Brocadia 和 Chloroflexi 的含量较高,这可能会导致产生更多的疏水性有机物和腐殖质。疏水性代谢产物和厌氧菌沉积在疏水膜表面,形成严重污垢。因此,与 AO-MBR 相比,在运行 PNA-MBR 时更迫切需要对亲水膜进行改性,以减轻膜污垢。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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