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首页> 外文期刊>Journal of Environmental Management >Elucidating sludge characteristic, substrate transformation and microbial evolution in a two-sludge denitrifying phosphorus removal system under the impact of HRT
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Elucidating sludge characteristic, substrate transformation and microbial evolution in a two-sludge denitrifying phosphorus removal system under the impact of HRT

机译：阐明在HRT影响下的两污泥反硝化除磷系统中的污泥特性，底物转化和微生物演变

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摘要

Granule formation has been recognized as a promising biotechnology in denitrifying phosphorus removal (DPR) systems by facilitating phosphorus accumulation organisms (PAOs) especially denitrifying PAOs (DPAOs), and hydraulic selection made this a more difficult task in continuous operation. This study aimed at exploring the microscopic mechanism and putting forward an effective strategy for DPR granulation under the impact of hydraulic retention time (HRT) (12 h, 10 h, 8 h) in a novel Anaerobic Anoxic Oxic - Moving Bed Biofilm Reactor (A~2/0 - MBBR) system. With the reduction of intracellular carbon storage (COD_(intra)) efficiency (88.58%-78.53%), nitrogen (N) (85.45%-79.11%) and phosphorus (P) (96.55%-92.47%) removals both dropped, but it exhibited a growth of anoxic phosphorus uptake rate (PURA) (3.79-5.68 mg P/(gMLVSS h)). The batch tests associating with substrate transformation of poly-ss-hydroxyalkanoates (PHA), glycogen (Gly) agreed well with the corresponding stoichiometry of phosphorus release rate (PRR) (4.83-7.53 mg P/(gMLVSSh)), PURa (3.55-5.43 mg P/(gMLVSS h)), oxic phosphorus uptake rate (PUR_o) (6.08-6.21 mg P/(gMLVSSh)), and DPAOs/ PAOs ratios (57.17%-89.31%), indicating a shift of microbial community. DPR granules gradually stabilized with low sludge volume index (SVI_5/SVI_(30) ratio = 1.1-1.2), dense and compact structure, higher P content (11.63%), more extracted extracellular polymeric substances (EPS) (111.40-160.31 mg/gMLVSS) as proteins/poly-saccharides (PN/PS) ratios (1.70-3.47) increased, leading to better sludge settleability and cell hydrophobicity. Fluorescence in situ hybridization (FISH) results showed that PAOs (mainly Cluster I: 20.20%) were the dominant bacteria in the A~2/0 reactor although a small amount of Defluviicoccus (3.18-3.48%) was responsible for nitrite accumulation, while ammonium-oxidizing bacteria (AOB) (mainly Nitrosomonas: 10.75%) and nitrite-oxidizing bacteria (NOB) (mainly Nitrospira: 15.06%) were enriched in the MBBR.
机译：通过促进磷累积生物（PAO）特别是反硝化PAO（DPAO），颗粒形成已成为脱磷除磷（DPR）系统中一种有前途的生物技术，而水力选择使其在连续操作中变得更加困难。这项研究旨在探索微观机理，并提出一种在新型厌氧性缺氧氧气-移动床生物膜反应器（ART）中的水力停留时间（HRT）（12 h，10 h，8 h）影响下DPR制粒的有效策略。 〜2/0-MBBR）系统。随着细胞内碳储存（COD_（intra））效率（88.58％-78.53％）降低，氮（N）（85.45％-79.11％）和磷（P）（96.55％-92.47％）的去除率均下降，但它显示出缺氧磷吸收率（PURA）的增长（3.79-5.68 mg P /（gMLVSS h）。与聚-β-羟基链烷酸酯（PHA），糖原（Gly）的底物转化相关的分批测试与磷释放速率（PRR）（4.83-7.53 mg P /（gMLVSSh）），PURa（3.55- 5.43 mg P /（gMLVSS h），氧磷吸收率（PUR_o）（6.08-6.21 mg P /（gMLVSSh））和DPAO / PAO比率（57.17％-89.31％），表明微生物群落发生了变化。 DPR颗粒逐渐稳定，污泥体积指数低（SVI_5 / SVI_（30）= 1.1-1.2），致密致密的结构，较高的P含量（11.63％），提取的细胞外聚合物（EPS）（111.40-160.31 mg / gMLVSS）随着蛋白质/多糖（PN / PS）比（1.70-3.47）的增加而增加，从而导致更好的污泥沉降性和细胞疏水性。荧光原位杂交（FISH）结果表明，PAO（主要是簇I：20.20％）是A〜2/0反应器中的主要细菌，尽管少量的Defluviicoccus（3.18-3.48％）负责亚硝酸盐的积累，而MBBR中富含氨氧化细菌（AOB）（主要为亚硝基孢菌：10.75％）和亚硝酸盐氧化细菌（NOB）（主要为亚硝基螺菌：15.06％）。

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