|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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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
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|
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|
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