Laboratory-scale Study on Combined Autotrophic-heterotrophic Denitrification Based on Pyrite and PHBV

被引：0
|
作者：
Wu W. [1 ]
Zhao L. [1 ]
Zhou Q. [1 ]
Jia L. [1 ]
机构：
[1] College of Environmental Sciences and Engineering, Peking University, Beijing
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2022年 / 30卷 / 02期
关键词：
Autotrophic and heterotrophic denitrification; Biofilm; Dominant bacteria; Pack bed bioreactor; Pyrite; Solid carbon source;
D O I：
10.16058/j.issn.1005-0930.2022.02.003
中图分类号：
学科分类号：
摘要：
In response to the requirements for advanced nitrate removal in wastewater treatment plants, pyrite (FeS2) and poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) were selected to set up a combined autotrophic-heterotrophic denitrification packed bed bioreactor for treating secondary effluent of wastewater treatment plants. Through monitoring influent and effluent water quality, material structure characterization (SEM), and16S rDNA, the operation effect and mechanism of the combined autotrophic-heterotrophic denitrification system were explored. Results showed that the denitrification rate of FeS2-PHBV synergistic denitrification system is better than that of FeS2 autotrophic system alone. When the hydraulic retention time was 2 h, the denitrification efficiency could reach more than 90%, and the sulfate produced was less. Compared with the heterotrophic PHBV system alone, the synergistic system achieved the same total nitrogen removal performance while releasing less DOC (23. 62 mg/L). In the FeS2-PHBV system, the surface structures of the two materials changed significantly, which was due to the enrichment and utilization of biofilms on the material surface. The presence of the dominant bacteria, including Sporomusaceae and Clostridium sensu stricto 7 FeS2-PHBV system, realized the synergistic denitrification of heterotrophic and autotrophic. Therein, the autotrophic denitrification driven by Fe-related Clostridium may play an important role in nitrogen removal in the FeS2-PHBV system. © 2022, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：282 / 294
页数：12
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