Empowering anaerobic digestion of dairy cow manure with pretreatment and post-treatment using vacuum stripping

Mohammad A.H. Badsha, Pubudu W. Arachchilage, Tryg Lundquist and Wendong Tao

Renewable Energy, 2024, vol. 237, issue PB

Abstract: Although dairy cow manure is an abundant feedstock of anaerobic digestion, pretreatment is needed to increase biogas production. This study introduced the vacuum stripping and absorption (VaSA) process for pretreatment of dairy cow manure, examined the efficacy of VaSA pretreatment on anaerobic digestion, and applied VaSA to digester effluent for ammonia recovery and pathogen reduction. Two 18-L mesophilic digesters were operated semi-continuously with VaSA-treated and raw dairy manure in parallel with two control digesters fed raw manure only. Pretreatment of dairy manure by VaSA for 2 h increased the dissolved fraction of volatile solids by 44.8–45.5 %. Consequently, the digesters receiving VaSA-pretreated and raw manure produced 17 % more biogas than the control digesters at the volatile solids loading rate of 1.8 g/Lreactor/d. The pretreatment also improved digestate dewaterability, with time-to-filter and viscosity decreased by 8.5–14.5 %. Post-treatment of digestate by VaSA reduced fecal coliform to undetected. Ammonia mass transfer coefficients were similar in VaSA pretreatment of dairy manure and post-treatment of manure digestate (0.21–0.29 1/h). Post-treatment allows more digestate to be applied to nearby land at lower transportation costs and benefits recycling of digestate due to pathogen reduction. Overall, this mini-pilot study proved coupling anaerobic digestion and VaSA to be a profitable strategy to empower anaerobic digestion systems.

Keywords: Alkali treatment; Ammonia recovery; Anaerobic digestion; Dairy manure; Thermal treatment; Vacuum stripping (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:237:y:2024:i:pb:s0960148124017828

DOI: 10.1016/j.renene.2024.121714

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