Enrichment of PHAs-producing bacteria by granular sludge in ABR acidogenic sulfate-reducing phase

被引：0

作者：

Chenxiang W. ^{[1
]}

Yongli Q. ^{[1
]}

Yongrong J. ^{[1
]}

Shijia G. ^{[1
]}

Guoquan Z. ^{[1
]}

Zhenju S. ^{[2
]}

机构：

[1] College of Life and Environmental Science, Guilin University of Electronic Technology, Guangxi, Guilin

[2] School of Engineering, Westlake University, Zhejiang, Hangzhou

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 12期

关键词：

acidogenic sulfate-reducing phase; anaerobic baffled reactor; metabolic type; polyhydroxyalkanoates; synthesis pathway;

D O I：

10.16085/j.issn.1000-6613.2023-0203

中图分类号：

学科分类号：

摘要：

In order to investigate the feasibility of synthesizing polyhydroxyalkanoates (PHAs) from sulfate organic wastewater through anaerobic treatment, a five-compartment anaerobic baffled reactor (ABR) was utilized to enrich PHAs-producing bacteria using sulfate organic wastewater as substrate, and the effects of different influent COD/SO42− ratios (12.5, 9.3 and 4.0) on PHAs synthesis efficiency of granular sludge in the acidogenic sulfate-reducing phase (the first and second compartments) of ABR were examined to explore the PHA synthesis pattern in this system. The results showed that as the inflow COD/SO42− ratio decreased, the removal of COD and SO42− in the acidogenic sulfate-reduction phase shifted downstream. In the first compartment, the dominant microbial metabolism type was the butyric acid type, while in the second compartment, it shifted from the acetic acid type to the butyric acid type. The compartment with high content of PHAs in the granular sludge shifted from the first compartment to the second compartment. The best PHAs synthesis effect was observed when the inflow COD/SO42− ratio was 9.3, which led to a large enrichment of PHAs-producing bacteria and high production of PHAs in the granular sludge of the acidogenic sulfate-reduction phase. The PHAs-producing bacteria in the granular sludge were large, and the PHAs granules were densely distributed throughout the bacterial cells. In the acidogenic sulfate-reducing phase, there existed a bio-chain cooperation relationship among acid-producing bacteria (APB), fatty-acid utilized sulfate reducing bacteria (FSRB) and acetic-acid utilized sulfate reducing bacteria (ASRB), and a large amount of PHAs was formed inside the bacterial cells. This study provided theoretical support for the resource utilization of sulfate organic wastewater. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：6658 / 6665

页数：7

共 36 条

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