Effect of pyrite particle size on the denitrification performance of autotrophic or split-mixotrophic bioreactors supported by pyrite/polycaprolactone.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-05-01 DOI:10.1002/wer.11040
Xihui Guo, Gang Peng, Lin Tan, Yan Zhang, Jing Wang, Weibo Wang, Shiyang Zhang
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Abstract

In this study, a pyrite-based autotrophic denitrification (PAD) system, a polycaprolactone (PCL)-supported heterotrophic denitrification (PHD) system, and a pyrite+PCL-based split-mixotrophic denitrification (PPMD) system were constructed. The pyrite particle size was controlled in 1-3, 3-5, or 5-8 mm in both the PAD and PPMD systems to investigate the effect of pyrite particle size on the denitrification performance of autotrophic or split-mixotrophic bioreactors. It was found that the PAD system achieved the best denitrification efficiency with an average removal rate of 98.98% in the treatment of 1- to 3-mm particle size, whereas it was only 19.24% in the treatment of 5- to 8-mm particle size. At different phases of the whole experiment, the nitrate removal rates of both the PHD and PPMD systems remained stable at a high level (>94%). Compared with the PAD or PHD system, the PPMD system reduced the concentrations of sulfate and chemical oxygen demand in the final effluent efficiently. The interconnection network diagram explained the intrinsic metabolic pathways of nitrogen, sulfur, and carbon in the three denitrification systems at different phases. In addition, the microbial community analysis showed that the PPMD system was beneficial for the enrichment of Firmicutes. Finally, the impact mechanism of pyrite particle size on the performance of the PPMD system was proposed. PRACTITIONER POINTS: The reduction of pyrite particle size was beneficial for improving the efficiency of the PAD process. The change in particle size had an effect on NO2 --N accumulation in the PAD system. The accumulation of NH4 +-N in the PPMD system increased with the decrease in particle size. The reduction of pyrite particle size increased the production of SO4 2- in the PAD and PPMD systems. The correlations among the effluent indicators of the PAD and PPMD systems could be well explained.

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黄铁矿粒度对黄铁矿/聚己内酯支撑的自养或分体混养生物反应器反硝化性能的影响
本研究构建了基于黄铁矿的自养反硝化(PAD)系统、聚己内酯(PCL)支持的异养反硝化(PHD)系统和基于黄铁矿+PCL的分离-混养反硝化(PPMD)系统。在 PAD 和 PPMD 系统中,黄铁矿的粒径分别控制在 1-3、3-5 或 5-8 毫米,以研究黄铁矿粒径对自养或分体式混养生物反应器反硝化性能的影响。结果发现,在处理 1 至 3 毫米粒径的黄铁矿时,PAD 系统的反硝化效率最高,平均去除率为 98.98%,而在处理 5 至 8 毫米粒径的黄铁矿时,平均去除率仅为 19.24%。在整个实验的不同阶段,PHD 和 PPMD 系统的硝酸盐去除率都稳定在较高水平(>94%)。与 PAD 或 PHD 系统相比,PPMD 系统能有效降低最终出水中的硫酸盐浓度和化学需氧量。互联网络图解释了三个反硝化系统在不同阶段氮、硫、碳的内在代谢途径。此外,微生物群落分析表明,PPMD 系统有利于富集固氮菌。最后,提出了黄铁矿粒度对 PPMD 系统性能的影响机制。实践点:黄铁矿粒径的减小有利于提高 PAD 工艺的效率。粒度的变化对 PAD 系统中 NO2-N 的积累有影响。PPMD 系统中 NH4 +-N 的积累随着粒径的减小而增加。黄铁矿粒径的减小增加了 PAD 和 PPMD 系统中 SO4 2- 的产生。PAD 和 PPMD 系统出水指标之间的相关性可以得到很好的解释。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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