Effective partial denitrification of biological effluent of landfill leachate for Anammox process: Start-up, influencing factors and stable operation

Yilin Li; Wenjia Zhang; Yun Dai; Xiaomei Su; Yeyuan Xiao; Dan Wu; Faqian Sun; Rongwu Mei; Jianrong Chen; Hongjun Lin

doi:10.1016/j.scitotenv.2021.150975

Effective partial denitrification of biological effluent of landfill leachate for Anammox process: Start-up, influencing factors and stable operation

Sci Total Environ. 2022 Feb 10;807(Pt 3):150975. doi: 10.1016/j.scitotenv.2021.150975. Epub 2021 Oct 14.

Authors

Yilin Li¹, Wenjia Zhang¹, Yun Dai², Xiaomei Su³, Yeyuan Xiao⁴, Dan Wu⁵, Faqian Sun⁶, Rongwu Mei⁷, Jianrong Chen¹, Hongjun Lin¹

Affiliations

¹ College of Geography and Environmental Science, Zhejiang Normal University, Jinhua 321004, China.
² Shenzhen Green Century Environmental Technology Co. Ltd, Shenzhen 518055, China.
³ College of Geography and Environmental Science, Zhejiang Normal University, Jinhua 321004, China. Electronic address: [email protected].
⁴ Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Shantou 515063, China.
⁵ Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore.
⁶ College of Geography and Environmental Science, Zhejiang Normal University, Jinhua 321004, China; Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China. Electronic address: [email protected].
⁷ Eco-Environmental Science Design & Research Institute of Zhejiang Province, Hangzhou 310007, China.

PMID: 34656579
DOI: 10.1016/j.scitotenv.2021.150975

Abstract

Partial denitrification combined with Anammox is a promising approach for simultaneous removal of ammonium and nitrate from wastewaters. In this study, the start-up, influencing factors and stable operation of partial denitrification for treating biological effluent from landfill leachate were investigated. High nitrate loads (3.85 kg N m^-3 d^-1) and short hydraulic retention time (0.66 h) were obtained in the partial denitrification process, yielding a suitable ratio of NO₂^--N/NH₄⁺-N in the effluent for downstream Anammox process. The study also revealed the importance of carbon sources, COD/NO₃^--N ratio and salinity in the partial denitrification. Acetate-type carbon source, COD/NO₃^--N ratio of about 3.0 and salinity lower than 1% favored high-efficient partial denitrification. The endogenous carbon sources from high-rate partial denitrification sludge contributed to low COD consumption in the process. During the partial denitrification, the dominant genus of Thauera was enriched, and shifted to Pseudomonas with the increase of organic removal rates.

Keywords: COD/N ratio; Landfill leachate; Microbial community; Partial denitrification; Salinity.

MeSH terms

Anaerobic Ammonia Oxidation
Denitrification*
Sewage
Wastewater
Water Pollutants, Chemical*

Substances

Sewage
Waste Water
Water Pollutants, Chemical