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dc.contributor.authorLatif, Asif
dc.contributor.authorMehta, Chirag
dc.contributor.authorBatstone, Damien
dc.date.accessioned2019-05-29T13:17:20Z
dc.date.available2019-05-29T13:17:20Z
dc.date.issued2018
dc.identifier.issn1879-2448
dc.identifier.doi10.1016/j.watres.2018.08.069
dc.identifier.urihttp://hdl.handle.net/10072/382632
dc.description.abstractRecovery of phosphate from wastewater is challenging, with one of the best opportunities being recovery from sludge anaerobic digestion liquor, as struvite. However, this is limited by the proportion of total phosphorous which is soluble, due to in-digester metal ion precipitation. High-pressure anaerobic digestion may enable enhanced phosphate solubility (and hence recovery potential), without the use of added acid, due to an increased liquid phase CO2 concentration. This was tested at 2, 4, and 6 bar absolute (bara) vs a 1 bara control reactor, fed with activated sludge. Increased pressure significantly (p = 0.0008), increased the fraction of phosphate that was soluble, ranging from 52% at 1 bara, to 75% at 6 bara. Model based analysis indicated that the main reason for increased solubility was pH depression (down to 6.4 at 6 bara), rather than changes in ion pairing (with carbonates) or increases in ionic activity. However, biological performance was adversely impacted, with a substantial loss in VS and COD destruction (on the order of 5%–10% absolute). No organic acid accumulation was observed. Bacterial and archaeal communities were significantly impacted (p∼0.0003–0.0005), with a shift to specific organisms, including Bacteroidales Rikenellaceae within the bacteria, and a Deep Sea Euryarchaeotal Group at 2 bara, and Methanocellaceae within the archaea at 4 and 6 bara. The work indicates that high-pressure operation is a technically viable option to improve phosphate recovery, and produce a high-methane biogas product, but that the loss of overall conversion needs to be further addressed, possibly through two-stage digestion.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUnited Kingdom
dc.relation.ispartofpagefrom660
dc.relation.ispartofpageto666
dc.relation.ispartofjournalWater Research
dc.relation.ispartofvolume145
dc.subject.fieldofresearchWater Resources Engineering
dc.subject.fieldofresearchcode090509
dc.titleEnhancing soluble phosphate concentration in sludge liquor by pressurised anaerobic digestion
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, School of Engineering and Built Environment
gro.hasfulltextNo Full Text
gro.griffith.authorLatif, Asif


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