Spatiotemporal distribution and interaction of denitrifying functional genes in a novel DAS-NUA biofilter used for groundwater nitrate treatment

Wu, Xu; Wang, Longmian; Peng, Fuquan; Zhang, Aiguo; Xie, Xuege; Wang, Zibo; Wang, Xu; Lian, Jing; Ni, Lixiao; Cui, Yibin; Zhang, Yimin; Yang, Fei; Zhu, Yueming; Mao, Xuhui

doi:10.1016/j.scitotenv.2020.136595

Cited by 12 publications

(1 citation statement)

References 33 publications

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“…Cupriavidus is capable of heterotrophic nitrification and aerobic denitrification. This bacteria has a good removal effect and a high removal efficiency for NH 4 + -N and NO 3 − -N, and it is capable of simultaneous nitrification and denitrification [ 26 , 27 ]. Flavobacterium is also a common denitrifying bacteria in wastewater treatment and has a high nitrate removal capacity [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

Chen

Zheng

et al. 2021

IJERPH

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Integrated sewage treatment system (ISTY) is a new technology for rural domestic sewage treatment. In the ISTY, the carbon source in the denitrification stage is often insufficient, affecting the denitrification efficiency. In order to improve the denitrification efficiency, several commonly available agricultural wastes, peanut shell (PS), sawdust (SD), peat (PT), and their mixtures (MT), were selected as supplementary carbon sources in the denitrification stage of ISTY to study the denitrification efficiency. Results show that PS exhibited a high carbon release capacity. PS released an enormous amount of carbon in 144 h, and the cumulative total organic carbon was 41.99 ± 0.7 mg/(g·L). The optimum carbon source dosage was 3 g/L, the nitrate removal rates of PS exceeded 95% after 48 h, and the denitrification rates were 9.35 mg/(g·L), which were 63.92% higher than that of the control group. After running the ISTY for 120 h, and with PS as supplementary carbon sources, the removal rate of TN increased from 29.76% to 83.86%. At the genus level, the dominant denitrifying bacteria in ISTY, after adding PS, were Pseudomonas and Cupriavidus, accounting for 78.68%, an increase of 72.90% compared with the control group. This evidence suggested that PS can obviously enhance the denitrification efficiency of the ISTY as a supplementary carbon source.

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Section: Resultsmentioning

confidence: 99%