Journal
BIORESOURCE TECHNOLOGY
Volume 249, Issue -, Pages 57-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.10.004
Keywords
Subsurface wastewater infiltration system; Aeration; Nitrogen; Biochar; Sludge
Funding
- National Natural Science Foundation of China [41001321, 41471394]
- Liaoning BaiQianWan Talents Program [2015(45)]
- Ecology and Environment Research Center Director Foundation of Shenyang Normal University [EERC-T-201501, EERC-T-201601]
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Organics removal, nitrogen removal, N2O emission and nitrogen removal functional gene abundances in four subsurface wastewater infiltration systems (SWISs), named SWIS A (no intermittent aeration without biochar and sludge), SWIS B (no intermittent aeration with biochar and sludge), SWIS C (intermittent aeration without biochar and sludge), SWIS D (intermittent aeration with biochar and sludge) were investigated. Intermittent aeration enhanced chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN) removal and the abundances of nitrogen removal functional genes (amoA, nxrA, napA, narG, nirS, nirK, qnorB and nosZ) compared to non-aerated SWISs. High COD (95.4 +/- 0.2%), NH4+-N (96.2 +/- 0.6%), TN (86.4 +/- 0.5%) removal efficiencies and low N2O emission rate (18.4 mg/(m(2)d)) were obtained simultaneously in intermittent aerated SWIS amended with biochar and sludge. The results suggested that intermittent aerated SWISs amended with biochar and sludge could be an effective and appropriate method for improving treatment performance and reducing N2O emission.
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