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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 4, 2012
Accepted August 22, 2012

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effect of supplying a carbon extracting solution on denitrification in horizontal subsurface flow constructed wetlands

Yi Ding¹ Xinshan Song¹ Yuhui Wang¹ Denghua Yan^{1 2†}

¹College of Environmental Science & Engineering, Donghua University, No2999, Renmin North, Songjiang District, Shanghai 201620, China ²China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Beijing 100038, China

Korean Journal of Chemical Engineering, February 2013, 30(2), 379-384(6), 10.1007/s11814-012-0139-4

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Abstract

Denitrification strongly depends on the availability of carbon source in constructed wetlands(CWs). In this study, several relevant carbon source extracting solutions made from hydrolyzate of selected wetland litters were added to CWs for nitrogen removal enhancement. The feasibility of supplying a carbon extracting solution to improve potential denitrification rate in horizontal subsurface flow constructed wetland was deeply investigated. Combinations of different hydraulic retention time (HRT, especially for 2-day and 4-day) with different influent COD/N ratios were_x000D_ designed to prove the enhancement on denitrification by carbon source supplement. In addition, specific denitrification rate (SDNR) was calculated for the comparison of the nitrogen removal at different COD/N ratios. The sequential operation results on total nitrogen (TN) and nitrate (NO3_x000D_ ^(-)-N) removal efficiencies were obtained in CW system with an influent COD/N ratio of 4.0. The accumulation of nitrite (NO2^(-)-N) was found to be closely related to the removal of NO3^(-)N. Meanwhile, no obvious accumulation of NO2^(-)-N was found when the removal of NO3^(-)-N was relatively high.

Keywords

Carbon Extracting Solution COD/N Ratio Denitrification Horizontal Subsurface Flow Constructed Wetland Nitrogen Removal

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