Journal
BIORESOURCE TECHNOLOGY
Volume 340, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125658
Keywords
Waste activated sludge; Calcium hypochlorite; Methanogenesis; Microbial community; Phosphorus recovery
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair (CRC) in Future Water Services
- China Scholarship Council (CSC)
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The study demonstrated that pretreatment of WAS with Ca(ClO)2 significantly improved anaerobic digestibility and methane production. Low doses of Ca(ClO)2 enhanced digestion efficiency, while high doses reduced microbial activities and prolonged methane production lag phase.
Waste activated sludge (WAS) can be treated using anaerobic digestion (AD) for biogas recovery and volume reduction. However, the poor digestibility and hydrolysis of WAS limit AD applications. The current study investigated the feasibility of applying calcium hypochlorite as a WAS pretreatment strategy to improve AD treatment efficiency using laboratory reactors. The results showed that pretreatment with 5 - 20% Ca(ClO)2 (total suspended solids basis) significantly enhanced WAS anaerobic digestibility, and led to significantly enhanced methane production rate and biomethane yield comparing to the AD of raw WAS (P 0.05). Low Ca (ClO)2 pretreatment (5 - 10%) significantly enhanced digestion efficiency, which can be attributed to the development of fermentative and syntrophic bacteria. However, high Ca(ClO)2 doses ( 20%) reduced microbial activities, leading to slow release of dissolved organic compounds and prolonged methane production lag phase. In addition, high Ca(ClO)2 removed 82.7% of the initial phosphate by calcium-phosphate binding, reducing the phosphorus in liquid digestate.
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