title: Nitrate removal from groundwater by hydrogen-fed autotrophic denitrification in a bio-ceramsite reactor.
abstract: In this work, the denitrification performance of a bio-ceramsite reactor based on autohydrogenotrophic denitrification was investigated. The effects of various experimental parameters such as nitrate loading, carbon to nitrogen ratio (C/N), water temperature and pH were evaluated during the operation. The unique aspect of this research is that the bio-reactor uses ceramsite as a carrier, which can provide a habitat for autohydrogenotrophic biocoenoses to accrete and grow. The results indicated that the denitrification rate increased as nitrate loading (below 130 mg NO3(-)-N/L) increased. However, the activity of autohydrogenotrophic denitrifying bacteria was inhibited when nitrate loading was further increased to higher than 130 mg NO3(-)-N/L. Denitrification efficiency changed slightly with C/N, this system performed well if C/N was more than 0.9. The optimum temperature for the reactor was 25-35 °C. This denitrification system was positively related to pH, as a neutral or alkaline environment was more preferable for the reactor. During the operation, effluent nitrite levels were always maintained below 1.75 mg NO2(-)-N/L.
authors: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywangwhu@126.com.
authors: Dan
authors: D
authors: Chen
authors: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywangwhu@126.com.
authors: Kai
authors: K
authors: Yang
authors: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywangwhu@126.com.
authors: Hongyu
authors: H
authors: Wang
authors: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors: Bin
authors: B
authors: Lv
mesh_terms: D019149:Bioreactors; D058440:Denitrification; D060587:Groundwater / Q000737:chemistry*; D006859:Hydrogen; D006863:Hydrogen-Ion Concentration; D009566:Nitrates / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
chemical_list: D009566:Nitrates; D014874:Water Pollutants, Chemical; D006859:Hydrogen