Metagenomics analysis of microbial community distribution in large-scale and step-by-step purification system of swine wastewater. (15th November 2022)

• Record Type: Journal Article
• Authors: Zheng, Mingmin; Shao, Shanshan; Chen, Yanzhen; Chen, Bilian; Wang, Mingzi
• Is Part Of: Environmental pollution. Volume 313(2022)
• Publication Date: 2022-11-15
• Subjects: Swine wastewater treatment -- Metagenomic analysis -- Microbial community -- Large-scale system -- Step-by-step processing; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.120137
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Biological treatment is one of the most widely used methods to treat swine wastewater in wastewater treatment plants. The microbial community plays an important role in the swine slurry treatment system. However, limited information is available regarding the correlation between pollutant concentration and dominant microbial community in swine wastewater. This work aimed to study the profiling of microbial communities and their abundance in the 40 M 3 /day large-scale and step-by-step treatment pools of swine wastewater. Metagenome sequencing was applied to study the changes of microbial community structure in biochemical reaction pools. The results showed that in the heavily polluted pools, it was mainly Proteobacteria, Cyanobacteria, Chlorella and other strains that could tolerate high concentration of ammonia nitrogen to remove nitrogen and absorb chemical oxygen demand (COD). In the moderately polluted pools, Nitrospirae, Actinobacteria and other strains further cooperated to purify swine wastewater. In the later stage, the emergence of Brachionus indicated the reduction of water pollution. The dominant microbes and their abundance changed with the purification of swine wastewater in different stages. Moreover, the dominant microflora of swine wastewater treatment pools at all levels reflected little difference in phylum classification level, while in genus classification level, the dominant microflora manifested great difference. Findings demonstrated that the microorganisms maintained ecological balance and absorbed the nutrients in the swine wastewater treatment pools, so as to play the role of purifying sewage. Therefore, the stepwise purification of swine wastewater can be realized by adding bacteria and microalgae of different genera. Graphical abstract: Image 1 Highlights: Dominant microbial community changed with the gradient purification of swine wastewater. The addition of exogenous microbial strains played a vital role in wastewater treatment. Co-culture of bacteria and microalgae can realize the gradual purification of wastewater.