Investigation of the optimal percentage of green seaweed that may be co-digested with dairy slurry to produce gaseous biofuel

Investigating two-phase digestion of grass silage for demand-driven biogas applications: Effect of particle size and rumen fluid addition

“…The biogas produced from the SLBR-UASB system was evaluated for methane composition (% CH 4 v/v) by an Agilent 6890 GC with thermal conductivity detector. VFA concentrations were measured using an Agilent 6890 GC with flame ionisation detector as described in Allen et al [23]. For the leaching trials, two samples per week were analysed over the 30 days of operation for each individual leaching trial.…”

Investigation of effect of particle size and rumen fluid addition on specific methane yields of high lignocellulose grass silage

“…NDF, assayed with a heat stable amylase and sodium sulphite, concentrations were evaluated using the ANKOM filter bag technique (ANKOM, 2006a,b) with reference to the analytical method of Van Soest et al (1991), and expressed on an ash-free basis. VFA concentrations were measured using an Agilent 6890 GC with flame ionisation detector as described in Allen et al (2014). VFA analysis was performed on an almost weekly basis for the CSTR trials, with samples prepared by centrifuging for 10 min at 15,000 rpm with 0.2 mL HPO 3 added to remove any particulate matter.…”

“…To meet the mandatory EU transport targets set under the Renewable Energy Directive (EC, 2009), a number of digestible feedstocks have been identified for gaseous biofuel production in Ireland including food waste , green seaweed and slurry (Allen et al, 2014). Grass silage, a substantial crop resource, has also been recognised for its potential contribution .…”

Methane and hydrogen sulfide production during co-digestion of forage radish and dairy manure

“…As the sulfur was rapidly utilized, the metabolic activity of the SRB declined, resulting in all digesters having similar biogas H 2 S concentrations by Day 6. Allen et al [31] demonstrated that increasing the fraction of fresh Ulva lactuca, a sulfur-rich green seaweed, from 25 to 75% inclusion with dairy manure (VS basis) decreased the percentage of CH 4 in the biogas from 51 to 25%, with the 25% Ulva co-digestion mixture having the lowest H 2 S concentration. A large inhibitory effect on CH 4 production with increased radish addition was not found in our study considering cumulative CH 4 production values and the CH 4 concentration during peak production.…”