Short-term and long-term effects of Zn (II) on the microbial activity and sludge property of partial nitrification process

Xiaojing Zhang; Yue Zhou; Nan Zhang; Kaiwei Zheng; Lina Wang; Guanglu Han; Hongzhong Zhang

doi:10.1016/j.biortech.2016.12.099

Short-term and long-term effects of Zn (II) on the microbial activity and sludge property of partial nitrification process

Bioresour Technol. 2017 Mar:228:315-321. doi: 10.1016/j.biortech.2016.12.099. Epub 2016 Dec 30.

Authors

Xiaojing Zhang¹, Yue Zhou², Nan Zhang², Kaiwei Zheng², Lina Wang², Guanglu Han², Hongzhong Zhang³

Affiliations

¹ Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China. Electronic address: zhangxiaojing@zzuli.edu.cn.
² Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
³ Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China; Key Laboratory of Pollution Treatment and Resource, China National Light Industry, Zhengzhou University of Light Industry, Zhengzhou 450001, China.

PMID: 28086172
DOI: 10.1016/j.biortech.2016.12.099

Abstract

Autotrophic nitrogen removal was an innovative and economical nitrogen removal technology with less oxygen and no organics consumption, in which partial nitrification (PN) is the key component. It is necessary to clear the impact of metal ions on PN since the development of industry increased their opportunity for entering into wastewater. In this study, PN process was successfully started-up in an SBR, the short-term and long-term effects of Zn (II) on microbial bioactivity and the sludge adsorption ability for Zn (II) were investigated. Results suggested that low Zn (II) were favorable for AOB bioactivity, while the long-term effect also induced NOB bioactivity. The suppression threshold of Zn (II) on AOB in short-term effect was 10mgL^-1, which rose to 50mgL^-1 in the long-term effect due to the self-adaption. The PN sludge presented prominent absorbability for zinc and performed a quadratic relation with the Zn (II) concentration.

Keywords: AOB; Autotrophic nitrogen removal; NOB; Partial nitrification; Zn (II).

MeSH terms

Ammonium Compounds / analysis
Bacteria / drug effects*
Bacteria / metabolism
Bioreactors / microbiology
Nitrification / drug effects*
Nitrites / metabolism
Nitrogen / analysis
Oxidation-Reduction / drug effects
Sewage / microbiology*
Time Factors
Waste Disposal, Fluid
Zinc / pharmacology*

Substances

Ammonium Compounds
Nitrites
Sewage
Zinc
Nitrogen