Effects of aeration strategy on the evolution of dissolved organic matter (DOM) and microbial community structure during sludge bio-drying
- 808 Downloads
Sludge bio-drying in which sludge is dried by means of the heat generated by the aerobic degradation of its own organic substances has been widely used for sludge treatment. A better understanding of the evolution of dissolved organic matter (DOM) and its degradation drivers during sludge bio-drying could facilitate its control. Aeration is one of the key factors that affect sludge bio-drying performance. In this study, two aeration strategies (pile I—the optimized and pile II—the current) were established to investigate their impacts on the evolution of DOM and the microbial community in a full-scale sludge bio-drying plant. A higher pile temperature in pile I caused pile I to enter the DOM and microbiology stable stage approximately2 days earlier than pile II. The degradation of easily degradable components in the DOM primarily occurred in the thermophilic phase; after that degradation, the DOM components changed a little. Along with the evolution of the DOM, its main degradation driver, the microbial community, changed considerably. Phyla Firmicutes and Proteobacteria were dominant in the thermophilic stage, and genus Ureibacillus, which was the primary thermophilic bacteria, was closely associated with the degradation of the DOM. In the mesophilic stage, the microbial community changed significantly at first and subsequently stabilized, and the genus Parapedobacter, which belongs to Bacteriodetes, became dominant. This study elucidates the interplay between the DOM and microbial community during sludge bio-drying.
KeywordsMicrobial community Sludge bio-drying Dissolved organic matter
This work is supported by the National Water Pollution Control and Management Technology Major Project of China (2012ZX07202-005) and the National Natural Science Foundation of China (21377151).
Conflict of interest
The authors declare no conflict of interest.
- Caporaso JG, Lauber CL, Walters WA, Berg-lyons D, Lozupone CA, Turnbaugh PJ, Fierer N, Knight R (2010) Global patterns of 16S rRNA diversity at a depth of millions of sequences per sample. Proc Natl Acad Sci U S A 108:1516–1522Google Scholar
- Jang HM, Cho HU, Park SK, Ha JH, Park JM (2014) Influence of thermophilic aerobic digestion as a sludge pre-treatment and solids retention time of mesophilic anaerobic digestion on the methane production, sludge digestion and microbial communities in a sequential digestion process. Water Res 48:1–14CrossRefPubMedGoogle Scholar
- Jewell WJ, Dondero NC, van Soest PJ, Cummings RT, Vegara WW, Linkenheil R (1984) High temperature stabilization and moisture removal from animal wastes for by-product recovery. Final report for the Cooperative State Research Service, US Department of Agriculture, USA, p 169Google Scholar
- Marhuenda-Egea FC, Martínez-Sabater E, Jordá J, Moral R, Bustamante MA, Paredes C, Pérez-Murcia MD (2007) Dissolved organic matter fractions formed during composting of winery and distillery residues: evaluation of the process by fluorescence excitation-emission matrix. Chemosphere 68:301–309CrossRefPubMedGoogle Scholar
- Michele P, Giuliana D, Carlo M, Sergio S, Fabrizio A (2015) Optimization of solid state anaerobic digestion of the OFMSW by digestate recirculation: a new approach. Waste Manag 35:111–118Google Scholar
- Roy G, Jasmin S, Stuart P (2006) Technical modelling of a batch biodrying reactor for pulp and paper mill sludge. CHISA 2006. 17th Int Congr Chem Process Eng 24:20Google Scholar
- Ryckeboer J, Mergaert J, Vaes K, Klammer S (2003) A survey of bacteria and fungi occurring during composting and self-heating processes. Ann Microbiol 53:349–410Google Scholar
- Sugni, M, Calcaterra, E, Adani, F (2005) Biostabilization-biodrying of municipal solid waste by inverting air-flow. Bioresour Technol 96:1331–1337Google Scholar
- Zhang J, Lü F, Shao L, He P (2014) The use of biochar-amended composting to improve the humification and degradation of sewage sludge. Bioresour Technol 1:1–7Google Scholar