Factors Affecting Nitrate Concentrations and Nitrogen and Oxygen Isotope Values of Effluents from Waste Water Treatment Plant

被引：0
|
作者：
Zhang D. [1 ]
Ge W.-B. [1 ]
Zhao A.-P. [2 ]
Gao Z.-P. [1 ]
Chen H. [1 ]
Zhang C. [1 ]
Jiang H. [3 ]
Wu W.-Y. [1 ]
Liao Q. [1 ]
Li C.-J. [1 ]
Huang X.-Y. [1 ]
Ma B.-J. [1 ]
机构：
[1] School of Resource and Environment, Henan Polytechnic University, Jiaozuo
[2] Kangda Environmental Protection Water Co., Ltd., Jiaozuo
[3] Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 06期
关键词：
ammonia; nitrate; nitrogen and oxygen isotopes; nitrogen transfer; waste water treatment plant;
D O I：
10.13227/j.hjkx.202206285
中图分类号：
学科分类号：
摘要：
Urban domestic sewage is one of the important nitrate (NO-3) sources for surface water; however, their NO-3concentrations and nitrogen and oxygen isotope values (δ15N-NO-3and δ18O-NO-3) remain unclear, and the factors affecting NO-3concentrations and δ15N-NO-3and δ18O-NO-3values of effluents in the waste water treatment plant (WWTP) are still unknown. Water samples in the Jiaozuo WWTP were collected to illustrate this question. Influents, clarified water in the secondary sedimentation tank (SST), and effluents of the WWTP were sampled every 8 h. The ammonia (NH4+) concentrations, NO3-concentrations, and δ15N-NO-3and δ18O-NO-3values were analyzed to elucidate the nitrogen transfers through different treatment sections and illustrate the factors affecting the effluent NO-3concentrations and isotope ratios. The results indicated that(1) the mean NH4+concentration was (22. 86 ±2.16)mg·L-1in the influent and decreased to (3. 78 ± 1. 98) mg·L-1in the SST and continuously reduced to (2. 70 ± 1. 98) mg·L-1in the effluent of the WWTP. The median NO-3concentration was 0.62 mg·L-1in the influent, and the average NO-3concentration increased to (33.48 ±3.10) mg·L-1in the SST and gradually increased to (37. 20 ±4. 34) mg-L-1 in the effluent of the WWTP. (2) The mean values of δ15N-NO-3and δ18O-NO3-were (17. 1 ± 10.7)% and (19. 2 ±2. 2)% in the influent of the WWTP, the median values of δ15N-NO-3and δ18O-NO-3were 11.9% and 6.4% in the SST, and the average values were (12.6 ± 1.9)% and (5. 7 ±0. 8)% in the effluent of the WWTP. (3) The NH+4concentrations of influent had significant differences compared to those in the SST and the effluent (P < 0.05). The reduction of NH+4concentrations in the SST was due to the above nitrification during the aerobic treatment process, which transferred NH4+to NO-3. The NH4+concentrations in the SST had no sig nificant differences with that in the effluent of the WWTP (P > 0. 05). (4) The NO-3concentrations in the influent had significant differences with those in the SST and the effluent (P <. 05), and minor NO-3concentrations but relatively high δ15N-NO-3and δ18O-NO-3values in the influent were probably due to denitrification during the pipe sewage transportation. The obviously increased NO-3concentrations (P<0.05) but decreased δ18O-NO3-values (P < 0. 05) in the SST and the effluent resulted from water oxygen incorporation during the nitrification. The above results confirmed the impacts of aerobic and anaerobic treatment processes on NO3-concentrations and isotope ratios of effluent from the WWTP and provided scientific basis for the identification of sewage contributions to surface water nitrate via average δ15N-NO3-and δ18O-NO3-values. © 2023 Science Press. All rights reserved.
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页码：3301 / 3308
页数：7
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