Predicting Methane Production Potential of Anaerobic Co-digestion of Swine Manure and Food Waste (original) (raw)
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Evaluation of Methane Production From Dairy Cow Manure and Vegetable Waste
Journal of Agricultural Science
Dairy cow manure has high buffering capacity hence a substrate for anaerobic digestion, however the process is not optimised in mono-digestion system due to limited substrate. The aim of the study was to assess the effect of co-digesting animal waste and vegetable waste on methane production. Two systems were applied- batch and continuous anaerobic digestion system to determine effect on methane yield. The experiments were conducted with treatments as: manure alone (M), composite of manure with cabbage (MC), manure with potatoes (MP), manure with cabbage and potatoes (MCP), faecal alone (F), faecal with cabbage (FC), faecal with potatoes (FP) and faecal with cabbage and potatoes (FCP). Rectal grab samples were collected prior to incubation and manure was collected from the pens. All treatments were in replicates. Composite of manure or faecal with cabbage and potatoes produced the highest biogas (FCP: 32.1 mL/g DM, MCP: 29.5 mL/g DM) and methane (FCP: 3.13 mL/g DM, MCP: 2.36 mL/g DM...
The Journal of Solid Waste Technology and Management, 2018
This study evaluated the potential of biogas generation of the fresh organic fraction of municipal solid wastes (OFMSW) inoculated with swine manure and cattle manure, based on the volatile solids content obtained from biochemical methane potential (BMP) tests. Several physico-chemical parameters (e.g. volatile solids, pH and chemical oxygen demand) were assessed in the laboratory before and after 50 days of incubation of several samples of OFMSW, swine manure and cattle manure, and mixtures thereof. During incubation, reductions in percentage of volatile solids were relatively low (from 5.5% to 11.4%), indicating the existence of substrates that can degrade after the 50-day digestion period. Among the physico-chemical parameters evaluated, pH was a limiting parameter for anaerobic digestion of OFMSW and manures. The mixture showing the best performance in terms of volume of biogas generated contained 1 gvs OFMSW: 1 gvs swine manure, which led to the production of 60.4 mL.gVS-1 or 22 mL.gOFMSW-1 biogas. The values of CH4 concentration increased throughout the incubation period, and the CH4 concentration value peaked at 80% for the mixture 1 gvs OFMSW:1 gvs swine manure. The results obtained indicate the OFMSW and manures can be effectively used for power generation.
Biogas Production Potential from Anaerobic Co-Digestion of Food Waste and Animal Manure
Bulletin of the Chemical Society of Nigeria, 2024
The potential of biogas production by the anaerobic codigestion (AcoD) of canteen food waste and animal manure was investigated using the biochemical methane potential assay (BMP). The BMP assay was conducted under thermophilic temperature of 35 °C in a batch process at digestion time of 40 d. Waste substrate mixture was digested at a fixed proportion of 1:1 with different animal manure as co-substrate. Maximum cumulative biogas production (418 ml g-1 VS) was achieved during codigestion of food waste with pig manure > chicken manure (408 ml g-1 VS) > goat manure (319 ml g-1 VS). Generally, all manure codigested reactors produced 1.01 to 1.34 times more biogas than food waste alone indicating the synergistic effect of codigestion on overall biogas productivity. With analogous increase in biogas production, manure amendment produced significant (p<0.05) substrate biodegradation in terms of total and volatile solids loss. The microbial load profile prior and post-AD revealed significant reduction (p<0.05)in microbial species suggestion that anaerobic digestion can be adopted as a method of waste treatment and hygienization.
2017
Anaerobic digestion of swine manure for the production of biogas principally CH 4 may add value to manure through the production of energy. However, the large nutrient load, from total ammoniacal nitrogen (TANammonium (NH 4 +) + ammonia (NH 3 (l))), in the manure and digestate is a problem during anaerobic digestion of swine manure. Low carbon:nitrogen (C:N) ratios and related NH 3 inhibition are major issues affecting methane (CH 4) generation
The Biogas Production from Mixture of Swine Manure and Food Waste
Abstract: The objective of this study was to determine the operation conditions for anaerobic digestion of food waste (FW) with swine manure(SM). The test was conducted in 20 L (13 L material volume) completely stirred tank reactor (CSTR) at mesophilic temperature (36-38 o C). The mixtures ratios of SM and FW were 1:0, 3:1, 2:1, 1:1 (SM: FW) on a volatile solid (VS) basis. The reactor performance was evaluated on the basis of TVFA/TA ratio, pH, methane content, and biogas yield. The biogas yield was improved through co-digestion compared to swine manure only. The methane content was in the range of 70-74%. The reactor process was stable up to mixture ratio of 2:1 (SM: FW) and when the mixture ratio increased to 1:1 (SM: FW) the reactor process was failed. Thus the mixing ratio of 2:1 (SM: FW) was recommended as optimal for the co-digestion of food waste with swine manure.
Biogas production from co-digestion of different proportions of food waste and fresh bovine manure
Biomass Conversion and Biorefinery, 2020
The present study aimed to evaluate the process of anaerobic co-digestion of different proportions of food waste and fresh bovine manure. The experiments were carried out in the laboratory (using 250-mL reactors) and in a pilot-scale biodigester (8 m 3). The laboratory experiment was conducted with batch feed systems testing three food waste (FW) and bovine manure (BM) ratios: 0:1, 1:2, and 3:1 (equivalent to 0, 33, and 75 % of food waste in the digester substrate, respectively). The pilot-scale biodigester had a continuous feed system and received a 1:2 FW:BM mixture ratio. The highest accumulated biogas production in the laboratory was 273 mL g-1 of volatile solids (VS) in the treatment with the 1:2 FW:BM ratio. Concentrations of volatile fatty acids (VFA) greater than 8 g L-1 inhibited methane production, except in the treatment without food waste. In the pilot-scale biodigester, concentrations of VFA were below the inhibitory threshold, and the biogas and methane yields were 271 L kgVS-1 and 220 L kgVS-1 , respectively. Therefore, food waste can be successfully co-digested with fresh bovine manure in continuous feed digesters, with an initial organic load rate of at least 2.74 kgVS m-3 day-1. Future studies should aim to test progressive increases in food waste load to identify the threshold for inhibition.
This study aimed to investigate potential methane production through anaerobic co-digestion of rice straw and digested swine manure with different total solids. The research was carried out in bench scale with utilizing batch system. To evaluate the stability of anaerobic co-digestion process, the experiment was run in triplicate. The anaerobic co-digestion process was operated in 500 mL batch digesters under constant agitation speed and temperature. The agitation speed was maintained at 270 r/min. Temperature of the batch system was set and maintained at 35oC. Digested swine manure utilized in this experiment was obtained from semi-continuous digesters run at steady state condition, with 25 days of hydraulic retention time under mesophilic condition. Rice straw (RS) generated the highest methane production at 3% total solids (TS) which was around (1814±47.43) mL, where in this concentration, it had C:N ratio at 10.6:1. Rice straw obtained the highest methane yield at 3% TS, which was around (141.4±3.70) mL CH4/g volatile solids (VS) added. Rice straw also had the highest chemical oxygen demand (COD) removal and VS reduction at 3% TS which were around (52.97%±1.46%) and (61.81%±1.04%), respectively.
Bioresource Technology, 2012
Anaerobic co-digestion of the solid fraction of separated pig manure (SPM) with dried grass silage (DGS) was evaluated in three identical continuously stirred tank reactors (CSTRs) at 35 ± 1°C. The feedstock contained 20% DGS in CSTR1, 30% DGS in CSTR2 and 40% DGS in CSTR3 on a volatile solids (VS) basis. Organic loading rates (OLR) of 1.0, 1.5, 2.0 and 3.0 kg VS/m 3 /d were studied and it was found that the OLR affected the digester performance more than the DGS proportion in the feedstock. Tripling the OLR increased volumetric methane yields by 88% and decreased specific methane yields by 38%. At the OLR of 3 kg VS/m 3 /d, post-methane production potentials of digestates ranged from 38% to 41% of total methane production potentials of the feedstock. An energy yield estimation on a 654-sow pig unit showed that 268-371 MWh/a electricity and 383-530 MWh/a heat would be generated.
Enhancement of methane production from co-digestion of chicken manure with agricultural wastes
Co-digestion of chicken manure and agricultural wastes was used to improve methane production. Semisolid material (10% TS) was used at the thermophilic and mesophilic laboratory conditions. Co-digestion resulted in increase of the methane production by 93% (e.g. 695 mL g À1 VS). Ammonia accumulation was reduced by 39%, while 100% of acetate produced was degraded to methane. a b s t r a c t The potential for methane production from semi-solid chicken manure (CM) and mixture of agricultural wastes (AWS) in a co-digestion process has been experimentally evaluated at thermophilic and mesophilic temperatures. To the best of author ' s knowledge, it is the first time that CM is co-digested with mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Two types of anaer-obic digestion processes (AD process) were used, process 1 (P1) using fresh CM (FCM) and process 2 (P2) using treated CM (TCM), ammonia stripped CM, were conducted. Methane production in P1 was increased by 93% and 50% compared to control (no AWS added) with maximum methane production of 502 and 506 mL g À1 VS obtained at 55 °C and 35 °C, respectively. Additionally, 42% increase in methane production was observed with maximum volume of 695 mL g À1 VS comparing P2 test with P2 control under 55 °C. Ammonia accumulation was reduced by 39% and 32% in P1 and P2 tests.
The biogas potential and the emission of greenhouse gases from the manure deriving from dairy cattle fed different diets has been studied in both batch and continuously run experiments. The cows were fed either maize silage supplement with low fat concentrate (maize), maize silage supplemented with concentrate with crushed rape seed or grass-clover silage supplement with low fat concentrate. In all experimental diets forage made up 60% of dry matter. The rations ranged in the following order in terms of biogas production from the manure: maize+fat>maize>grass. In the study the CH 4 emissions of nontreated manure were also simulated under low temperature anaerobic conditions where the natural occurring bacteria degrade the organic matter. Here the emission in the fat rich ration was similar to the other rations indicating that the higher degradation in a controlled biogas process do not necessarily follow the same trend as with lower temperatures and bacteria that is not adapted to low temperatures. Thus taking the combined effect of biogas and storage in consideration the fat rich ration is only superior when ambient temperatures are lower than 15 o C. However using the international recognized method for emission calculation the methane emission will be higher with the fat rich diet at all temperatures and benefits from biogas production will thus be higher for this diet than the other diets both in terms of gas production and reduction in methane emissions.