Insights into a Novel and Efficient Microbial Nest System for Treating Pig Farm Wastewater.

IF 4.1 2区 生物学 Q2 MICROBIOLOGY
Lifei Chen, Lusheng Li, Guiying Wang, Meng Xu, Yizhen Xin, Hanhan Song, Jiale Liu, Jiani Fu, Qi Yang, Qile Tian, Yuxi Wang, Haoyang Sun, Jianqun Lin, Linxu Chen, Jiang Zhang, Jianqiang Lin
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Abstract

A microbial nest system (MNS) represents a novel and efficient approach to treating solid-liquid mixtures from pig farming instead of the conventional method, which separates the solid and liquid at first using centrifugation before treating the solid and liquid. However, the key environmental factors influencing the efficiency of this system and the microbial structure are still not clear. This study aimed to elucidate the changes in an MNS considering physicochemical properties, spectral analysis, and correlations between microbial community structures and environmental factors during the treatment. The results showed that the MNS underwent three temperature stages during the treatment process of piggery slurry: a warming period, a high-temperature period, and a cooling period. In the high-temperature period, the most abundant bacterium was Bacillus, with a relative abundance of 22.16%, and Chaetomium dominated the fungal community with a relative abundance of 11.40%. Moreover, the moisture content, pH value, and electrical conductivity (EC) exhibited an increasing trend, whereas the carbon-to-nitrogen (C/N) ratio and the ratio of ammonia nitrogen to nitrate nitrogen (NH4+-N/NO3--N) showed a decreasing trend. The accumulation of humic acid and fulvic acid suggested that the humification process of organic matter was occurring. The moisture content and C/N ratio were identified as crucial factors influencing the bacterial and fungal community structures, respectively. This study provides a theoretical basis for enhancing the efficiency of piggery slurry treatment using an MNS and rational optimisation of the associated processes.

新型高效微生物窝系统处理猪场废水的研究。
微生物窝系统(MNS)代表了一种处理养猪业固液混合物的新型高效方法,取代了传统方法,即在处理固液混合物之前先使用离心分离法分离固液。然而,影响该系统效率和微生物结构的关键环境因素尚不清楚。本研究旨在通过理化性质、光谱分析以及微生物群落结构与环境因素之间的相关性来阐明MNS在处理过程中的变化。结果表明,MNS在猪舍料浆处理过程中经历了升温、高温和冷却三个温度阶段。在高温时期,细菌数量最多的是芽孢杆菌(Bacillus),相对丰度为22.16%,毛菌(Chaetomium)以11.40%的相对丰度占主导地位。水分含量、pH值和电导率(EC)呈上升趋势,碳氮比(C/N)和氨氮与硝态氮(NH4+-N/NO3—N)呈下降趋势。腐植酸和黄腐酸的富集表明有机质发生了腐殖化过程。水分含量和碳氮比分别是影响细菌和真菌群落结构的关键因素。本研究为利用MNS提高猪舍料浆处理效率和合理优化相关工艺提供了理论依据。
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来源期刊
Microorganisms
Microorganisms Medicine-Microbiology (medical)
CiteScore
7.40
自引率
6.70%
发文量
2168
审稿时长
20.03 days
期刊介绍: Microorganisms (ISSN 2076-2607) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to prokaryotic and eukaryotic microorganisms, viruses and prions. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.
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