反硝化细菌
序批式反应器
硝化作用
化学
流出物
反硝化
磷
亚硝酸盐
曝气
环境化学
废水
强化生物除磷
缺氧水域
硝酸盐
氮气
制浆造纸工业
环境工程
活性污泥
有机化学
环境科学
工程类
作者
Yahong Luo,Kui Yi,Xinyu Zhang,Boya Li,Runtong Cao,Yingmiao Pang,LI Ming-xian,Cheng‐Lin Hou,Jinghua Lv,LI Xiao-pin,Dong Li
标识
DOI:10.1016/j.jenvman.2023.118598
摘要
Simultaneous bio-treatment processes of organic carbon (C)-, nitrogen (N)-, and phosphorus (P)-containing wastewater are challenged by insufficient carbon sources in the effluent. In the present study, two parallel anaerobic/aerobic sequencing batch reactors (R-1 and R-2) treating low C/N (≤4) wastewater were employed using different partial nitrification start-up strategies, controlled reduced aeration, and decreased sludge retention time. Advanced removal efficiencies for NH4+-N (≥96%), total nitrogen (TN, ≥86%), PO43−–P (≥95%), and CODintra (≥91%) were realized, with TN and PO43−–P effluent concentrations of 10.0 ± 3.5 and 0.11 ± 0.3 mg/L in R-1 and 9.28 ± 4.0 and 0.11 ± 0.1 mg/L in R-2, respectively. Higher nitrite accumulation rate (nearly 100%) and TN (121.1 ± 0.7 mg TN/g VSS·d) and P (12.5 ± 0.6 mg PO43−–P/g VSS·d) removal loadings were obtained in R-2 by a thorough elimination of nitrite-oxidizing bacteria. Moreover, different microbial structures and nutrient removal pathways were identified. Denitrifying glycogen-accumulating organisms (Candidatus Competibacter) and phosphorus-accumulating organisms (PAOs) (Tetrasphaera) removed N and P with partial nitrification–endogenous denitrification pathways and aerobic P removal in R-1. In R-2, aerobic denitrifying bacteria (Psychrobacter) and PAOs ensured N and P removal through the partial nitrification–aerobic denitrification and aerobic P removal pathways. Compared to R-1, R-2 offers greater efficiency, convenience, and scope to further reduce carbon-source demand.
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