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Nitrogen Removal and N 2 O Emission in Biochar‐Sludge Subsurface Wastewater Infiltration Systems
Author(s) -
Qi Shiyue,
Zhao Yue,
Wang Shiyao,
Zheng Fanping,
Pan Jing,
Fan Linlin,
Li Zhiqi,
Tan Chaoquan,
Hou Wanyuan
Publication year - 2018
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x15131012187935
Subject(s) - biochar , aeration , wastewater , chemical oxygen demand , chemistry , nitrogen , environmental chemistry , infiltration (hvac) , environmental engineering , mixed liquor suspended solids , sewage treatment , pulp and paper industry , environmental science , activated sludge , pyrolysis , organic chemistry , engineering , thermodynamics , physics
Nitrogen removal and N 2 O emission of biochar‐sludge amended subsurface wastewater infiltration systems (SWISs) with/without intermittent aeration under different organic surface loading rates (OSLRs) were investigated. Under OSLR, between 8.5 and 54.6 g COD/(m 2 d), average chemical oxygen demand (COD), NH + 4 ‐N, and total nitrogen (TN) removal rates decreased with OSLR increasing in non‐aerated SWISs amended with/without biochar‐sludge; increasing OSLR hardly affected COD and NH + 4 ‐N, removal in biochar‐sludge amended SWIS with intermittent aeration; N 2 O emission rate decreased with influent OSLR increasing in the SWISs. Biochar‐sludge amended SWIS with intermittent aeration obtained higher removal rates for COD (94.9 to 95.5%), NH + 4 ‐N, (90.5 to 93.7%), TN (86.5 to 89.9%) and lower N 2 O emission rates [13.4 to 14.7 mg/(m 2 d)] under high influent OSLR of 36.2 and 54.6 g COD/(m 2 d) were compared with non‐aerated SWISs with/without biochar‐sludge. Furthermore, the abundances of amoA, nxrA, napA, narG, nirS, nirK, qnorB, and nosZ genes involved in nitrogen removal were enhanced under high influent OSLR in biochar‐sludge amended SWIS with intermittent aeration.