Journal
REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY
Volume 15, Issue 2, Pages 173-211Publisher
SPRINGER
DOI: 10.1007/s11157-016-9396-8
Keywords
Sewage sludge; Hydrolysis; Pretreatment; Biogas production; Biosolids; Anaerobic digestion
Funding
- CONICYT (Chile) [21110449]
- Grant CONICYT + PAI [781413004]
- Doctoral Network REDOC.CTA, MINEDUC [UCO1202]
- CONICYT [2013-21130054, 2016-21160100]
- [CONICYT/FONDAP/15130015]
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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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