Water Science and Engineering 2018, 11(2) 114-119 DOI:   https://doi.org/10.1016/j.wse.2018.07.004  ISSN: 1674-2370 CN: 32-1785/TV

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Chaohu Lake Catchment
Jia-zhong Qian
Xiu-xuan Wang
Lei Ma
Long-ping Wang
Jian-kui Liu
Zhang-xian Yang
Article by Jia-zhong Qian
Article by Xiu-xuan Wang
Article by Lei Ma
Article by Long-ping Wang
Article by Jian-kui Liu
Article by Zhang-xian Yang

Simulation of denitrification in groundwater from Chaohu Lake Catchment, China

Jia-zhong Qian a, *, Xiu-xuan Wang a, Lei Ma a, Long-ping Wang b, Jian-kui Liu b, Zhang-xian Yang b

a School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
b Anhui Institute of Geo-Environment Monitoring, Hefei 230009, China


The eutrophication of Chaohu Lake in China is mainly attributed to nitrate inflow from non-point sources in the lake catchment. In this study, biological nitrate reduction from groundwater in the Chaohu Lake Catchment was investigated under laboratory conditions in a continuous up-flow reactor. Sodium acetate served as the carbon source and electron donor. Results showed that a carbon-to-nitrogen (C/N) molar ratio of 3:1 and hydraulic residence time (HRT) of 8 d could achieve the most rapid nitrate nitrogen ( ) depletion (from 100 mg/L to 1 mg/L within 120 h). This rate was confirmed when field groundwater was tested in the reactor, in which a   removal rate of 97.71% was achieved (from 60.35 mg/L to 1.38 mg/L within 120 h). Different levels of the initial   concentration (30, 50, 70, and 100 mg/L) showed observable influence on the denitrification rates, with an overall average   removal efficiency of 98.25% at 120 h. Nitrite nitrogen ( ) accumulated in the initial 12 h, and then kept decreasing, until it reached 0.0254 mg/L at 120 h. Compared with the initial value, there was a slight accumulation of 0.04 mg/L for the ammonia nitrogen ( ) concentration in the effluent, which is, however, less than the limit value. These results can provide a reference for evaluating performance of denitrification in situ.

Keywords Chaohu Lake Catchment   Denitrification   Eutrophication   Nitrate   Wetland  
Received 2017-05-10 Revised 2018-01-16 Online: 2018-04-30 
DOI: https://doi.org/10.1016/j.wse.2018.07.004

This work was supported by the National Natural Science Foundation of China (Grants No. 41641021 and 41372245), the Investigation and Evaluation of the Geological Environment in the Anhui Section of the Tan-Lu Fault Zone (Grant No. 2015-g-26), and the Science and Technology Project of Land and Resources of Anhui Province (Grant No. 2016-K-11).

Corresponding Authors: Jia-zhong Qian
Email: qianjiazhong@hfut.edu.cn
About author:


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