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dc.contributor.authorWang, Qilinen_US
dc.contributor.authorJiang, Guangmingen_US
dc.contributor.authorYe, Liuen_US
dc.contributor.authorYuan, Zhiguoen_US
dc.description.abstractMethane production from anaerobic digestion of waste activated sludge (WAS) is often limited by the slow degradation and poor substrate availability of WAS. Our previous study revealed that WAS pre-treatment using free nitrous acid (FNA, i.e. HNO2) is an economically feasible and environmentally friendly method for promoting methane production. In order to further improve methane production from WAS, this study presents a novel strategy based on combined FNA and heat pre-treatment. WAS from a full-scale plant was treated for 24 h with FNA alone (0.52–1.43 mg N/L at 25 °C), heat alone (35, 55 and 70 °C), and FNA (0.52–1.11 mg N/L) combined with heat (35, 55 and 70 °C). The pre-treated WAS was then used for biochemical methane potential tests. Compared to the control (no FNA or heat pre-treatment of WAS), biochemical methane potential of the pre-treated WAS was increased by 12–16%, 0–6%, 17–26%, respectively; hydrolysis rate was improved by 15–25%, 10–25%, 20–25%, respectively, for the three types of pre-treatment. Heat pre-treatment at 55 and 70 °C, independent of the presence or absence of FNA, achieved approximately 4.5 log inactivation of pathogens (in comparison to ∼1 log inactivation with FNA treatment alone), thus capable of producing Class A biosolids. The combined FNA and heat pre-treatment is an economically and environmentally attractive technology for the pre-treatment of WAS prior to anaerobic digestion, particularly considering that both FNA and heat can be produced as by-products of anaerobic sludge digestion.en_US
dc.relation.ispartofjournalWater Researchen_US
dc.subject.fieldofresearchEnvironmental Biotechnology not elsewhere classifieden_US
dc.titleEnhancing methane production from waste activated sludge using combined free nitrous acid and heat pre-treatmenten_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.hasfulltextNo Full Text

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