Enhanced nitrogen removal of aerobic denitrifier using extracellular algal organic matter as carbon source: application
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RESEARCH PAPER
Enhanced nitrogen removal of aerobic denitrifier using extracellular algal organic matter as carbon source: application to actual reservoir water Gang Wen1,2 · Tong Wang1,2 · Qiqi Wan1,2 · Ruihua Cao1,2 · Kai Li1,2 · Jingyi Wang1,2 · Tinglin Huang1,2 Received: 7 February 2020 / Accepted: 10 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Man-made organic matter acting as carbon source for oligotrophic aerobic denitrification has been studied extensively, while less attention has been paid to the actual organic matter derived from drinking water reservoir. In this study, the effect of extracellular organic matter (EOM) released from Microcystis aeruginosa and Chlorella sp. and organic matter in actual reservoir water on aerobic denitrification performance of Acinetobacter johnsonii strain WGX-9 has been investigated, by measuring nitrogen removal and determining changes in the properties of organic matter. Results indicated that the Acinetobacter johnsonii strain WGX-9 showed effective nitrogen removal efficiency when cultural conditions were low C/N of 5, pH of 5–11, and low temperature of 8 °C. The nitrate removal efficiency with EOM as the sole carbon source was relatively higher than that with intracellular organic matter or natural organic matter as the sole carbon source. This is probably due to that EOM exerts a lower molecular weight and better ability of donating electrons. Besides, the findings can elucidate that nitrate and total organic matter removal efficiency with actual high-density algal water as the carbon source was higher than that with actual low-density algal water as the carbon source. This was attributed to that more EOM was released in highdensity algal water, which highlighted the aerobic denitrification performance of Acinetobacter johnsonii strain WGX-9. This study will provide a reference for the application of aerobic denitrifier in drinking water reservoirs. Keywords Aerobic denitrifier · Carbon source · Molecular weight · Extracellular organic matter · Reservoir water
Introduction In recent years, reservoirs play a vital role in supplying water source for drinking water in many cities in China [1, 2]. However, nitrogen pollution, especially nitrate, is an Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00449-020-02376-8) contains supplementary material, which is available to authorized users. * Gang Wen [email protected] * Tinglin Huang [email protected] 1
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi’an University of Architecture and Technology, Xi’an 710055, People’s Republic of China
Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, People’s Republic of China
2
important problem faced by lots of reservoirs [3, 4]. Nitrate pollution not only causes significant deterioration in water quality such as eutrophication, but also affects human health and amphibian survival [
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