Intensified nitrogen removal in immobilized nitrifier enhanced constructed wetlands with external carbon addition

Wei Wang; Yi Ding; Yuhui Wang; Xinshan Song; Richard F Ambrose; Jeffrey L Ullman

doi:10.1016/j.biortech.2016.06.135

Intensified nitrogen removal in immobilized nitrifier enhanced constructed wetlands with external carbon addition

Bioresour Technol. 2016 Oct:218:1261-5. doi: 10.1016/j.biortech.2016.06.135. Epub 2016 Jul 2.

Authors

Wei Wang¹, Yi Ding², Yuhui Wang³, Xinshan Song⁴, Richard F Ambrose⁵, Jeffrey L Ullman⁶

Affiliations

¹ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China; Department of Environmental Health Sciences, University of California, Los Angeles, Los Angeles, CA 90095-1771, United States.
² College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China; College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China.
³ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China. Electronic address: yhwang@dhu.edu.cn.
⁴ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
⁵ Department of Environmental Health Sciences, University of California, Los Angeles, Los Angeles, CA 90095-1771, United States.
⁶ Department of Biological Systems Engineering, Washington State University, P.O. Box 646120, Pullman, WA 99164, United States.

PMID: 27396293
DOI: 10.1016/j.biortech.2016.06.135

Abstract

Nitrogen removal performance response of twelve constructed wetlands (CWs) to immobilized nitrifier pellets and different influent COD/N ratios (chemical oxygen demand: total nitrogen in influent) were investigated via 7-month experiments. Nitrifier was immobilized on a carrier pellet containing 10% polyvinyl alcohol (PVA), 2.0% sodium alginate (SA) and 2.0% calcium chloride (CaCl2). A batch experiment demonstrated that 73% COD and 85% ammonia nitrogen (NH4-N) were degraded using the pellets with immobilized nitrifier cells. In addition, different carbon source supplement strategies were applied to remove the nitrate (NO3-N) transformed from NH4-N. An increase in COD/N ratio led to increasing reduction in NO3-N. Efficient nitrification and denitrification promoted total nitrogen (TN) removal in immobilized nitrifier biofortified constructed wetlands (INB-CWs). The results suggested that immobilized nitrifier pellets combined with high influent COD/N ratios could effectively improve the nitrogen removal performance in CWs.

Keywords: Biofortification; COD/N ratio; Constructed wetlands; Immobilized pellet; Nitrification-denitrification.

MeSH terms

Biodegradation, Environmental*
Biological Oxygen Demand Analysis
Denitrification*
Nitrification
Nitrogen / chemistry*
Wetlands*

Substances

Nitrogen