Abstract
During wastewater treatment, most organic matter is transferred to a solid phase commonly known as sludge or biosolids. The high cost of sludge management and the growing interest in alternative energy sources have prompted proposals for different strategies to optimize biogas production during anaerobic sludge treatment. Because of the high solid content and complex structure of sludge-derived organic matter, methane production during digestion is limited at the hydrolysis step. Therefore, large digester volume and long retention times of over 20 days are necessary to achieve adequate stabilization. Pre-treatments can be used to hydrolyze sludge and consequently improve biogas production, solids removal and sludge quality after digestion. This paper reviews the main pre-treatment processes, with emphasis on the most recent developments. An overview of the different technologies is presented, discussing their effects on sludge properties and anaerobic digestion. Future challenges and concerns related to pre-treatment assessment and implementation are also addressed.
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Abbreviations
- AD:
-
Anaerobic digestion
- ATH:
-
Advanced thermal hydrolysis
- BOD:
-
Biochemical oxygen demand
- COD:
-
Chemical oxygen demand
- CST:
-
Capillary suction time
- DD:
-
Disintegration degree
- DMDO:
-
Dimethyldioxirane
- DOC:
-
Dissolved organic carbon
- DS:
-
Dry solids
- EDC:
-
Endocrine disrupting compounds
- EPS:
-
Extracellular polymeric substances
- F/I:
-
Feed/inoculum ratio
- FC:
-
Fecal coliforms
- GRS:
-
Growth rate of solubilization
- HE:
-
Helminth eggs
- HPH:
-
High pressure homogenization
- MW:
-
Microwave
- ODS:
-
Organic dry solids
- OLR:
-
Organic loading rate
- OM:
-
Organic matter
- OUR:
-
Oxygen uptake rate
- PAA:
-
Peracetic acid
- POMS:
-
Peroxymonosulfate
- PT:
-
Pre-treatment
- SBOD:
-
Soluble biochemical oxygen demand
- SCOD:
-
Soluble chemical oxygen demand
- SN:
-
Salmonella
- SS:
-
Suspended solids
- SRF:
-
Specific resistance to filtration
- SRT:
-
Solids retention time
- SVI:
-
Sludge volumetric index
- TCOD:
-
Total chemical oxygen demand
- TN:
-
Total nitrogen
- TPAD:
-
Thermally-phased anaerobic digestion
- TSPB-AD:
-
Temperature-staged biologically-phased anaerobic digestion
- TS:
-
Total solids
- TSS:
-
Total suspended solids
- US:
-
Ultrasound
- VFAs:
-
Volatile fatty acids
- VS:
-
Volatile solids
- VSS:
-
Volatile suspended solids
- WAS:
-
Waste activated sludge
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Acknowledgments
This work was supported by Grant No. 21110449 from CONICYT (Chile), Grant CONICYT + PAI/2014 No. 781413004 and CONICYT/FONDAP/15130015. The authors also thank the Doctoral Network REDOC.CTA, MINEDUC Grant UCO1202 at the University of Concepcion. P. Neumann and M. Venegas thank to CONICYT for their Scholarship Program CONICYT-PCHA/Doctorado Nacional/2013-21130054 and CONICYT-PCHA/Doctorado Nacional/2016-21160100, respectively for supporting their Ph.D. studies at the University of Concepción.
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Neumann, P., Pesante, S., Venegas, M. et al. Developments in pre-treatment methods to improve anaerobic digestion of sewage sludge. Rev Environ Sci Biotechnol 15, 173–211 (2016). https://doi.org/10.1007/s11157-016-9396-8
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DOI: https://doi.org/10.1007/s11157-016-9396-8