GUOLu,WANGXiao-jun,QIN Jia-fu,et al.Effect of Carbon Source Dosing Mode on Partial Denitrification Performance[J].China Water & Wastewater,2022,38(No.3):74-80.
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Effect of Carbon Source Dosing Mode on Partial Denitrification Performance

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: No.第3 Page: 74-80 Column: Date of publication: 2022-02-01
Author(s):
GUO　Lu1; 2;  WANG　Xiao-jun1; 2; 3;  QIN Jia-fu1; 2;  CHEN　Zhen-guo3; 4
（1. School of Environment and Energy， South China University of Technology， Guangzhou 510006， China； 2. Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Cluster， Guangzhou 510006， China； 3. Huaan Biotech Co. Ltd.， Foshan 528300， China；4. School of Chemistry and Chemical Engineering， South China University of Technology， Guangzhou 510665， China）
Keywords:
partial denitrification;  carbon source dosing mode;  nitrite accumulation;  microbial community
Abstract:
Partial denitrification is a promising pretreatment method for nitrate wastewater, which can provide essential substrate (NO2--N) for Anammox. However, different carbon source addition methods will affect the performance of partial denitrification. Under the condition that influent NO3--N was 100 mg/L, sodium acetate was the carbon source, and the ratio of carbon to nitrogen was 2, the effects of different carbon source dosing modes (one time dosing, three times dosing and six times dosing) on nitrogen transformation characteristics and reaction rate of partial denitrification were investigated. The partial denitrification with high efficiency and stability could be started in a short time by multiple dosing of carbon sources, and the partial denitrification performance with dosing of carbon source in six batches was the best. When carbon source was added for six times (t=0/10/20/30/40/50 min), the average NO3--N and NO2--N in the effluent were 7.33 mg/L and 60.92 mg/L, respectively, the average nitrogen transformation rate (NTR) of NO3--N to NO2--N was 86.55%, and the specific reduction rates of NO3--N ratio and NO2--N were 26.79 mg/(g·h) and 4.14 mg/(g·h), respectively. High?throughput sequencing showed that Bacteroidetes and Proteobacteria were the dominant bacterial phyla in the partial denitrification system. During the operation, the abundance of Thauera (a functional bacterium of partial denitrification) increased gradually, and its relative abundance in the systems with three dosing modes was 0, 14.29% and 17.11%, respectively, indicating that the dominant bacteria related to partial denitrification were enriched.
Last Update: 2022-02-01