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| Study on start-up and operation of partial denitrification filter in municipal wastewater treatment plant |
| TIAN Xia-di1,2, ZHANG Shu-jun1,2,3, YANG An-ming1,2, WANG Cong1,2,3, WU Cong-cong1,2, CHEN Chen1,2, WANG Jia-wei1,2,3, MENG Chun-lin1,2 |
1. Beijing Drainage Group Co., Ltd., Beijing 100044, China;
2. Beijing Engineering Research Center of Wastewater Resource, Beijing 100124, China;
3. Beijing Drainage Technology Co., Ltd., Beijing 100044, China |
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Abstract The feasibility of applying partial denitrification (NO3--N→NO2--N) process to advanced nitrogen removal in municipal wastewater treatment plant was explored by using biofilter. Taking the actual secondary effluent of municipal wastewater treatment plant as the influent, the effects of filtration rate, C/N ratio on the rapid start-up and stable operation of partial denitrification filter were investigated. In addition, the variation of water quality along the reactor and the composition of microbial community in the system were also explored. The partial denitrification filter can be started quickly in 3days by controlling the high filtration rate and low C/N ratio with actual secondary effluent. The average nitrate-nitrite transformation rate (NTR) of the partial denitrification filter was 60.3% in 120days and the maximum was 82.1%, which suggested that the partial denitrification process of continuous flow biofilm system has been successfully constructed. Higher filtration rate could improve the accumulation of nitrite in the filter while C/N ratio had little effect on the accumulation of nitrite. NTR was maintained at 62.0% in the system when the range of C/N ratio was 2~4.The data along the filter showed that the filter bed under 40cm was the main reaction area for nitrate removal and nitrite accumulation in the system. Due to the use of actual secondary effluent for the experiment, there were many kinds of microorganisms and the microbial diversity was relatively high, which was proved by the results of scanning electron microscopy and high throughput sequencing.
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Received: 12 August 2019
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