Crude glycerin in anaerobic co-digestion of dairy cattle manure increases methane production

Abstract

Anaerobic digestion of crude glycerin (CG) along with animal waste has been an excellent option for increasing the production of biogas and methane to achieve efficiency in the treatment of both residues. This study aimed to evaluate improvements in specific productions of biogas and methane, reductions in solid and fibrous components in substrates prepared with dairy cattle manure and CG (containing 14 % glycerol). With these residues, experimental substrates were prepared and placed in 25 batch digesters. Initial content of the TS in the influent was 4 % and CG was added in increasing doses (0, 5, 10, 15 and 20 % relative to total solids (TS) of the influent). Results were submitted to ANOVA and orthogonal contrasts to assess the effects of linear and quadratic order and thereby estimate the optimal CG doses through the adjusted models. The highest values for specific production of methane (0.19 and 0.26 L g −1 of TS and volatile solids (VS) added, respectively) were reached with the CG inclusions of 6 and 8 %, respectively. Total production of biogas with the inclusion of 6 % CG was 11 % higher when compared to the control treatment. The largest reduction in VS (48 %) was achieved with the addition of 4 % CG. Addition of CG at levels between 3 and 8 % improved the efficiency of the process of anaerobic digestion with dairy cattle manure.

Anaerobic co-digestion of animal manure at different waste cooking oil concentrations

“…were added, which matches YAMASHIRO et al (2013) andSIMM et al (2017). Those studies reported, respectively, 254.6L biogas.kg VS -1 and 250L biogas.kg TS added -1 during the co-digestion of cattle manure and residues with high lipid content.…”

“…Anaerobic biodigestion by itself adds value to animal manure due to the benefits of energy recycling, as pointed out in studies that reported yields of up to 238L biogas.kg volatile solids (VS) -1 for swine manure and 250 L biogas.kg VS -1 for cattle manure (SIMM et al, 2017). Such high biogas yields could be further potentialized since the process is impacted by Sunada et al nutrient availability in the fermentation substrate.…”