Unblocking the rate-limiting step of the municipal sludge anaerobic digestion

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dc.contributor.authorWang, Jiefuen
dc.contributor.authorSun, Yuepengen
dc.contributor.authorZhang, Dianen
dc.contributor.authorBroderick, Tomen
dc.contributor.authorStrawn, Maryen
dc.contributor.authorSantha, Harien
dc.contributor.authorPallansch, Karenen
dc.contributor.authorDeines, Allisonen
dc.contributor.authorWang, Zhi-Wuen
dc.date.accessioned2023-05-05T19:06:48Zen
dc.date.available2023-05-05T19:06:48Zen
dc.date.issued2022-10en
dc.description.abstractAnaerobic digestion stabilizes municipal sludge through total solids reduction and biogas production. It is generally accepted that hydrolysis accounts for the rate-limiting step of municipal sludge anaerobic digestion, impacting the overall rates of solids reduction and methane production. Technically, the sludge hydrolysis rate can be enhanced by the application of thermal hydrolysis pretreatment (THP) and is also affected by the total solids concentration, temperature, and solids retention time used in the anaerobic digestion. This study systematically analyzed and compared ways to take these four factors into the consideration of modern anaerobic digestion system for achieving the maximum solid reduction. Results showed that thermophilic anaerobic digestion was superior to mesophilic anaerobic digestion in terms of solids reduction but vice versa in terms of the methane production when integrated with THP. This difference has to do with the intermediate product accumulation and inhibition when hydrolysis outpaced methanogenesis in THP-enhanced thermophilic anaerobic digestion, which can be mitigated by adjusting the solids retention time. Practitioner points THP followed by TAD offers the greatest solids reduction rate. THP followed by MAD offered the greatest methane production rate. FAN inhibition appears to be an ultimate limiting factor constraining the methane production rate. In situ ammonia removal technique should be developed to further unblock the rate-limiting step.en
dc.description.notesThe study was supported by the Center for Applied Water Research and Innovation.en
dc.description.sponsorshipCenter for Applied Water Research and Innovationen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1002/wer.10793en
dc.identifier.eissn1554-7531en
dc.identifier.issue10en
dc.identifier.othere10793en
dc.identifier.pmid36184901en
dc.identifier.urihttp://hdl.handle.net/10919/114941en
dc.identifier.volume94en
dc.language.isoenen
dc.publisherWileyen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectanaerobicen
dc.subjecthydrolysisen
dc.subjectmesophilicen
dc.subjectsludgeen
dc.subjectSRTen
dc.subjectthermophilicen
dc.titleUnblocking the rate-limiting step of the municipal sludge anaerobic digestionen
dc.title.serialWater Environment Researchen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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