Recycling anaerobic digestate enhances the co-digestion potential of agro-industrial residues: influence of different digestates as sources of microbial inoculum

Ofon, Utibe A.; Ndubuisi-Nnaji, Uduak U.; Shaibu, Solomon E.; Fatunla, Opeyemi K.; Offiong, Nnanake‐Abasi O.

doi:10.1080/09593330.2021.1952313

Cited by 7 publications

(5 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Anaerobic digester sludge (ADS) obtained from the preceding step was subjected to thermal acclimation at 40 °C, after which it was incubated under dry anaerobic fermentation conditions for a period of 25 days [4]. This prolonged incubation period ensured the complete depletion of residual biogas, reducing the organic fraction available for digestion.…”

Section: Sample Collection and Pretreatmentmentioning

confidence: 99%

“…The main objective was to evaluate the potential for biomethane production and the biodegradability of these co-substrates. With some minor modifications, the experimental methodology described by Ofon et al [4] and Ndubuisi-Nnaji et al [3] was adopted. To facilitate the experiment, 100 mL amber borosilicate glass serum bottles (Wheaton 223766, USA) were used as the reactors, sealed with 20 mm aluminum crimp seals equipped with PTFE/Butyl septa for the headspace vials (Wheaton W224224, USA).…”

Section: Experimental Design and Anaerobic Digestion Assaymentioning

confidence: 99%

“…Although energy security remains a serious concern, particularly in developing countries, Nigeria and other developing countries are still grappling with these challenges as they largely depend on imported, expensive, and unsustainable fossil fuels as their major energy source. Therefore, establishing an alternative yet sustainable energy source through waste biomass valorization is affordable and renewable [3][4][5] According to some scholars [6][7][8], food processing in markets and shopping centres, food preparation in homes, hotels, canteens, restaurants, fast food centres, Mama put huts, and street food vendors as well as the aviation industry are all major sources of organic waste in developing economies. Vegetables, fruits, meat, baked goods, fries, dairy, and animal by-products that have gone bad may be found in catering trash.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biogas Production Potential From Anaerobic Co-Digestion of Food Waste and Animal Manure

Ofon,

Ndubuisi-Nnaji,

Udo

et al. 2024

JCSN

View full text Add to dashboard Cite

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.

show abstract

Section: Sample Collection and Pretreatmentmentioning

confidence: 99%

Section: Experimental Design and Anaerobic Digestion Assaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biogas Production Potential From Anaerobic Co-Digestion of Food Waste and Animal Manure

Ofon,

Ndubuisi-Nnaji,

Udo

et al. 2024

JCSN

View full text Add to dashboard Cite

show abstract

“…Consequently, AcoD provides a more stable operation than monodigestion. At higher scales, AcoD improves the anaerobic digestion process and makes its setup more feasible [ 13 ]. Additionally, some substrates can be recalcitrant to anaerobic degradation in monodigestion.…”

Section: Introductionmentioning

confidence: 99%

Promoting the Circular Economy on an Island: Anaerobic Co-Digestion of Local Organic Substrates as a Possible Renewable Energy Source

Fernández-Rodríguez

Berardino²,

Berardino

2023

Microorganisms

View full text Add to dashboard Cite

The local waste co-digestion is an interesting option to tackle in reduced and isolated areas like the islands. The islands have limited territory and scarce fuel production. Moreover, organic waste can create serious environmental problems in soil, water and air. Anaerobic co-digestion (AcoD) is a technology fulfilling the concept of waste-to-energy (WtE) based on local resources. The valorisation of organic waste through AcoD on an island would prevent environmental impacts, while being a source of renewable energy. In this study, cow manure (outdoor and indoor), pig slurry, bird manure, kitchen waste, sewage sludge and oily lacteous waste produced on Island Terceira (Portugal) were tested in mesophilic −35 °C- Biochemical Methane Potential (BMP) co-digestion assays. The goals were to analyse the recalcitrant and high potential produced waste and to estimate the energetic supply source on the island. The cow manure and pig slurry were used as inocula and specific methanogenic activities (SMAs) were carried out. The results showed that both substrates have a significant methanogenic activity–SMA 0.11 g-COD/(g-VSS.d) and 0.085 g-COD/(g-VSS.d), respectively. All the studied combinations were feasible in AcoD, showing TS removals in the range of 19–37%; COD removals in the range 67–78% and specific methane yields from 0.14 to 0.22 L/gCOD removed, but some differences were found. The modified Gompertz model fitted the AcoD assays (R2 0.982–0.998). The maximum biogas production rate, Rmax. was highest in the AcoD of Cow+Pig+Oily and in the Cow+Pig+Sludge with 0.017 and 0.014 L/g-VSadded.day, respectively, and the lowest in Cow+Pig+Bird with 0.010 L/g-VSadded. In our AcoD studies, the bird manure limited the performance of the process, since it was recalcitrant to anaerobic degradation. On the other hand, the oily lacteous waste showed a great potential in the anaerobic digestion. The estimated biogas production, from the best-studied condition, could cover the 11.4% of the energy supply of the inhabitants. These preliminary results would prevent the environmental impact of organic waste on the island and promote the use of local waste in a circular economy scenario.

show abstract

“…Short-chain fatty acids (acetic, propionic, and butyric acids) are saturated carboxylic acids containing six or fewer carbon atoms. Usually, they are the component of landfill leachate [8] and the digestate of anaerobic bioreactors [9]. The long-chain fatty acids in most cases accumulate in the environment as the part of household or industrial wastewater containing alkaline salts of fatty acids and soaps [10].…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Synthetic Organic Compounds by Methanogenic Microbiome as an Alternative Approach for Wastewater Purification and Energy Production

et al. 2022

View full text Add to dashboard Cite

The use of fossil fuels (methane, oil, etc.) is undergoing an unprecedented crisis now. There is the urgent need to search for alternative energy sources. A wide range of degraded organic materials can be effectively used to provide energy together with environmental protection. Soapstock is a hazardous waste containing a high concentration of toxic organic compounds of man-made origin (fatty acids, surfactants, dyes, etc.). To prevent environmental contamination such substances require an effective treatment approach. The goal of the study was to isolate the adapted-to-fatty-acids methanogenic microbiome and investigate the patterns of sodium acetate and soapstock degradation with simultaneous biomethane synthesis. The effectiveness of the degradation of sodium acetate and soapstock by non-adapted and adapted microbiomes was evaluated by decreasing the concentration of dissolved organic compounds. The effectiveness of the fermentation process was determined by the biogas (mixture of CH4 and CO2) yield. The most effective degradation occurred in the variant with sodium acetate and adapted methanogens and amounted to 77.9%. In other variants, the patterns and the efficiency of purification were similar ranging from 60.6 to 68.0%. The biomethane was mostly synthesized by adapted methanogens on the soapstock and sodium acetate as substrates. Thus, the CH4 yield was 368.4 L/kg of dissolved organic compounds or 127.5 L/kg of soapstock. The results of this study demonstrated the potential of methanogenic microorganisms in the biodegradation of soapstock with simultaneous biogas synthesis. The results can serve as a basis to reduce the reliance on fossil fuels by generating biomethane via the fermentation of toxic organics.

show abstract

Recycling anaerobic digestate enhances the co-digestion potential of agro-industrial residues: influence of different digestates as sources of microbial inoculum

Cited by 7 publications

References 47 publications

Biogas Production Potential From Anaerobic Co-Digestion of Food Waste and Animal Manure

Biogas Production Potential From Anaerobic Co-Digestion of Food Waste and Animal Manure

Promoting the Circular Economy on an Island: Anaerobic Co-Digestion of Local Organic Substrates as a Possible Renewable Energy Source

Biodegradation of Synthetic Organic Compounds by Methanogenic Microbiome as an Alternative Approach for Wastewater Purification and Energy Production

Contact Info

Product

Resources

About