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Bioresour Technol. 2018 Oct;265:357-364. doi: 10.1016/j.biortech.2018.06.023. Epub 2018 Jun 9.

Highly efficient of nitrogen removal from mature landfill leachate using a combined DN-PN-Anammox process with a dual recycling system.

Author information

1
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China.
2
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China. Electronic address: yonghuangsz@163.com.
3
Qizi Mountain Sanitary Landfill Plant of Suzhou, Suzhou Environmental Sanitation Administration Agency, Suzhou 215009, China.

Abstract

An efficient and stable combined denitrification-partial nitrification-Anammox process with a dual recycling system was used to remove nitrogen from mature landfill leachate. After 155 d of operation, the NO3- as the PN-Anammox byproduct was almost treated with biodegradable organic carbon in raw wastewater in a pre-denitrification reactor by external recycling system. When raw landfill leachate with NH4+-N concentration of 1900 mg/L was treated, an integrated reactor with airlift recycling was combined with the PN and Anammox reactions to efficiently remove NH4+ from the inflow. The total nitrogen concentration of effluent stabilized at 20 mg/L and total nitrogen removal efficiency was 99%. The maximum NO2- production rate in the aerobic zone was 2.2 kg/(m3·d) and the maximum nitrogen removal rate in the anaerobic zone was 21.4 kg/(m3·d). The most common phyla among the nitrification and the Anammox functional bacteria were Nitrosomonas, Candidatus Kuenenia, and Candidatus Brocadia after landfill leachate treatment.

KEYWORDS:

Dual recycling system; Landfill leachate; Microbiology community; Nitrogen removal efficiency; Partial nitrification-Anammox (PN-Anammox); Pre-denitrification

PMID:
29920445
DOI:
10.1016/j.biortech.2018.06.023
[Indexed for MEDLINE]

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