title: A possible method for in situ nitrogen removal in landfills by microbial-pumping-iron behavior.
abstract: Nitrogen pollution from landfills needs urgent treatment. A batch experiment was designed to explore the possible in situ nitrogen removal in landfills based on the hypothesis of microbial-pumping-iron behavior, namely anaerobic microbial iron oxidation and reduction. The results confirm that a simultaneous Fe(ii) oxidation, accompanied by nitrate (NO3(-)-N) reduction and dissimilatory Fe(iii) reduction, can happen in aged municipal solid waste (AMSW). This phenomenon can last at least 10 years after landfilling. Organics is an important intermediate medium in that process. The dynamic anaerobic Fe redox cycle has the potential of denitrification without ammonia nitrogen (NH4(+)-N) accumulation. AMSW with deposited ages of 1-3 years is a good choice to enhance this redox cycle behavior coupled with denitrification. Conversely, AMSW with longer deposited ages (8-10 years) has a quicker iron cycle and a smaller NH4(+)-N accumulation. This suggests a possible method for in situ nitrogen removal in landfills.
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China. shends@zju.edu.cn.
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Long
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Yao
authors.initials: Y
authors.lastname: Du
authors.forename: Huan
authors.initials: H
authors.lastname: Feng
authors.forename: Yuan
authors.initials: Y
authors.lastname: Fang
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Shen
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors; D058440:Denitrification; D004785:Environmental Pollutants / Q000378:metabolism*; D004787:Environmental Pollution / Q000517:prevention & control; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007501:Iron / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D062611:Solid Waste; D064091:Waste Disposal Facilities
chemical_list: D004785:Environmental Pollutants; D062611:Solid Waste; D007501:Iron; D009584:Nitrogen