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Water 2018, 10(8), 1051; https://doi.org/10.3390/w10081051

In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir

1
School of Energy and Environment, Zhongyuan University of Technology, No. 41 Zhongyuan Road (M), Zhengzhou 450007, China
2
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi’an University of Architecture and Technology, Xi’an 710055, China
3
Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 2 August 2018 / Accepted: 6 August 2018 / Published: 8 August 2018
(This article belongs to the Section Water Quality and Ecosystems)
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Abstract

A field scale experiment was performed to explore the nitrogen removal performance of the water and surface sediment in a deep canyon-shaped drinking water reservoir by operating WLAs (water-lifting aerators). Nitrogen removal performance was achieved by increasing the densities and N-removal genes (nirK and nirS) of indigenous aerobic denitrifiers. After the operation of WLAs, the total nitrogen removal rate reached 29.1 ± 0.8% in the enhanced area. Ammonia and nitrate concentrations were reduced by 72.5 ± 2.5% and 40.5 ± 2.1%, respectively. No nitrite accumulation was observed. Biolog results showed improvement of carbon metabolism and carbon source utilization of microbes in the enhanced area. Miseq high-throughput sequencing indicated that the denitrifying bacteria percentage was also higher in the enhanced area than that in the control area. Microbial communities had changed between the enhanced and control areas. Thus, nitrogen removal through enhanced indigenous aerobic denitrifiers by the operation of WLAs was feasible and successful at the field scale. View Full-Text
Keywords: aerobic denitrification; field scale experiment; nitrogen removal; nirS and nirK; microbial community variation aerobic denitrification; field scale experiment; nitrogen removal; nirS and nirK; microbial community variation
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Zhou, Z.; Huang, T.; Gong, W.; Li, Y.; Liu, Y.; Zhao, F.; Dou, Y.; Zhou, S.; Ma, W. In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir. Water 2018, 10, 1051.

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