| Title: | Anaerobic digestion of chemically enhanced primary treatment (CEPT) sludge and the microbial community structure |
| Author(s): | Ju F; Wang Y; Lau FT; Fung WC; Huang D; Xia Y; Zhang T; |
| Address: | "Environmental Biotechnology Lab, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China. Drainage Services Department, The Government of the Hong Kong Special Administrative Region, Hong Kong, China. Environmental Biotechnology Lab, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China. zhangt@hku.hk" |
| Journal Title: | Appl Microbiol Biotechnol |
| DOI: | 10.1007/s00253-016-7730-2 |
| ISSN/ISBN: | 1432-0614 (Electronic) 0175-7598 (Linking) |
| Abstract: | "The effectiveness and treatment conditions of FeCl3- and AlCl3-coagulated municipal sewage sludge from chemically enhanced primary treatment (CEPT) using anaerobic digestion (AD) and the structure of microbial community were investigated. The results based on 297 measurements under different operational conditions demonstrate good average AD performance of CEPT sludge, that is, percent volatile solid reduction of 58 %, specific biogas production (or biogas yield) of 0.92 m(3)/kg volatile solids (VS) destroyed, and methane content of 65.4 %. FeCl3 dosing, organic loading rate, temperature, and hydraulic retention time all significantly affected AD performance. FeCl3 dosing greatly improved specific methane production (methane yield) by 38-54 % and significantly reduced hydrogen sulfide (H2S) content in biogas (from up to 13,250 to <200 ppm), contributing to higher methane recovery and simplified biogas cleaning for power generation. Metagenomic analysis suggested that anaerobic digesters of both CEPT sludge and combined primary and secondary sludge were dominated by Bacteroidetes, Proteobacteria, Firmicutes, Actinobacteria, Thermotogae, and Chloroflexi. However, Methanomicrobia methanogens were better enriched in the anaerobic digesters of CEPT sludge than in the combined sludge. Further, different sources of CEPT sludge with various chemical properties nurtured shared and unique microbial community composition. Combined, this study supports AD as an efficient technology for CEPT sludge treatment and poses first insights into the microbial community structure" |
| Keywords: | Aluminum Chloride Aluminum Compounds/metabolism Anaerobiosis Bacteria/*classification/*metabolism *Biofuels *Biota Chemical Precipitation Chlorides/metabolism Ferric Compounds/metabolism Metagenomics Sewage/*microbiology Anaerobic digestion Biogas product; |
| Notes: | "MedlineJu, Feng Wang, Yubo Lau, Frankie T K Fung, W C Huang, Danping Xia, Yu Zhang, Tong eng Germany 2016/07/29 Appl Microbiol Biotechnol. 2016 Oct; 100(20):8975-82. doi: 10.1007/s00253-016-7730-2. Epub 2016 Jul 27" |
