Microbial diversity and structure variations with filter depth during excess sludge reduction by vermifiltration

Xing Meiyan; Yang Gege; Liu Jing; Ma Xiaojie

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Microbial diversity and structure variations with filter depth during excess sludge reduction by vermifiltration

Xing Meiyan 1 *,Yang Gege 2,Liu Jing 3,Ma Xiaojie 1

1.The Institute of Biofilm Technology of Tongji University

2. Key Laboratory of Yangtze River Water Environment, Ministry of Education

3. College of Environmental Science and Engineering, Tongji University

*Correspondence author

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Funding: The PhD Programs Foundation of Ministry of Education of China （No.20110072120029）

Opened online:23 November 2015

Accepted by: none

Citation: Xing Meiyan,Yang Gege,Liu Jing.Microbial diversity and structure variations with filter depth during excess sludge reduction by vermifiltration[OL]. [23 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661488

The present study focuses on the effect of filter depth for the diversity and characteristics of microbial structure by conducting a novel four-stage vermifiltration (VF) system with earthworms. The results revealed that the microbial diversity along the filter depth was consistent with the sludge removal efficiency in the system, the distribution of earthworms and the change of organic materials by detecting SS, VSS and earthworms at each column. Specially, Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) indicated that there were varies of microbial communities at different depths in VF, of which dominant species were Proteobacteria, especially the γ-proteobacteria. Earthworm activity and the distribution of organic matter led to the differences of the dominant populations at different depths in VF. Furthermore, the earthworm-microorganism interaction contributed to aerobic bacteria being preferentially selected in system. Overall, the results of the study described that the filter depth played an important role in sludge reduction, microbial diversity and structure.

Keywords:Sludge sludge and stabilization; Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE); Microbial diversity and structure; Microbial respiration

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