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Bioresour Technol. 2016 Nov;219:677-686. doi: 10.1016/j.biortech.2016.08.014. Epub 2016 Aug 8.

Biological denitrification process based on the Fe(0)-carbon micro-electrolysis for simultaneous ammonia and nitrate removal from low organic carbon water under a microaerobic condition.

Author information

1
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, PR China.
2
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, PR China. Electronic address: dsli@bjtu.edu.cn.
3
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China.

Abstract

A combined process between micro-electrolysis and biological denitrification (MEBD) using iron scraps and an activated carbon-based micro-electrolysis carrier was developed for nitrogen removal under a microaerobic condition. The process provided NH4(+)-N and total nitrogen (TN) removal efficiencies of 92.6% and 95.3%, respectively, and TN removal rate of 0.373±0.11kgN/(m(3)d) at corresponding DO of 1.0±0.1mg/L and HRT of 3h, and the optimal pH of 7.6-8.4. High-throughput sequencing analysis verified that dominant classes belonged to β-, α-, and γ-Proteobacteria, and Nitrospira. The dominant genera Hydrogenophaga and Sphaerotilus significantly increased during the operation, covering 13.2% and 6.1% in biofilms attached to the carrier in the middle of the reactor, respectively. Autotrophic denitrification contributed to >80% of the TN removal. The developed MEBD achieved efficient simultaneous nitrification and autotrophic denitrification, presenting significant potential for application in practical low organic carbon water treatment.

KEYWORDS:

Autotrophic denitrification; Electron donor production; Fe(0)–carbon micro-electrolysis; Low organic carbon wastewater; Microbial communities

PMID:
27544918
DOI:
10.1016/j.biortech.2016.08.014
[Indexed for MEDLINE]

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