title: Soil infiltration bioreactor incorporated with pyrite-based (mixotrophic) denitrification for domestic wastewater treatment.
abstract: In this study, an integrated two-stage soil infiltration bioreactor incorporated with pyrite-based (mixotrophic) denitrification (SIBPD) was designed for domestic wastewater treatment. Benefited from excellent adsorption ability and water-permeability, soil infiltration could avoid clogging, shorten operating time and lower maintenance cost. Respiration and nitrification were mostly engaged in aerobic stage (AES), while nitrate was majorly removed by pyrite-based mixotrophic denitrification mainly occurred in anaerobic stage (ANS). Fed with synthetic and real wastewater for 120days at 1.5h HRT, SIBPD demonstrated good removal performance showing 87.14% for COD, 92.84% for NH4(+)-N and 82.58% for TP along with 80.72% of nitrate removed by ANS. TN removal efficiency was 83.74% when conducting real wastewater. Compared with sulfur-based process, the effluent pH of SIBPD was maintained at 6.99-7.34 and the highest SO4(2-) concentration was only 64.63mgL(-1). This study revealed a promising and feasible application prospect for on-site domestic wastewater treatment.
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences, Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Kong
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Li
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences, Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: fengchuanping@gmail.com.
authors.forename: Chuanping
authors.initials: C
authors.lastname: Feng
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Chen
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences, Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Dong
authors.affiliation: School of Water Resources and Environment, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China.
authors.forename: Weiwu
authors.initials: W
authors.lastname: Hu
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007501:Iron / Q000737:chemistry*; D012988:Soil Microbiology; D013440:Sulfides / Q000737:chemistry*; D014462:Ultrafiltration / Q000295:instrumentation; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D007501:Iron; D013440:Sulfides; D062065:Wastewater; D014874:Water Pollutants, Chemical; C011342:pyrite
keywords: Alkalinity; Mixotrophic denitrification; Pyrite; Soil infiltration; Wastewater