Journal
BIORESOURCE TECHNOLOGY
Volume 247, Issue -, Pages 724-729Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.09.153
Keywords
Methane production; Solid retention time; Thermophilic temperature (65 degrees C); Single-stage digestion
Funding
- SEO, Nanyang Technological University for the project Evaluation of Products from Sludge Pre-treatment basis for Sustainable Wastewater/Sludge Treatment [SEO M4081600.C50]
- China Scholarship Council [CSC 201506340090]
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In this study, a thermophilic (65 degrees C) single-stage wasted activated sludge (WAS) digester was established and the effects of solid retention time (SRT) on the reactor performance were investigated. The result showed that the optimum SRT was 6 days with methane yield of 186.16 mL/g VS. It was found that SRT had little effect on the hydrolysis and volatile solids (VS) destruction, and the high temperature employed seemed sufficient to achieve maximum hydrolysis and VS destruction performance. Longer SRT, however, promoted the release of recalcitrant compounds and impaired acidification, leading to the low methane yield. The microbial community analysis revealed that the dominant pathway for methane production was through syntrophic activity of acetate oxidizing bacteria and hydrogenotrophic methanogens while acetoclastic methanogens were absent in the system.
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