Start-up of co-digestion of poultry litter and wheat straw in anaerobic sequencing batch reactor by gradually increasing organic loading rate: Methane production and microbial community analysis

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.

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“…. Similar results (0.10–0.19 L/g-VS added ) were obtained by Zhan et al [ 36 ] in a AcoD of poultry litter and wheat straw study.…”

Section: Resultssupporting

confidence: 89%

“…The other conditions reached values between 67 and 70% of COD removal. Similar results, between 70.3–85.9% of COD rem , were reported in the AcoD of poultry litter and wheat straw [ 36 ]. Moreover, Xing et al, [ 37 ] found COD removal efficiencies of 64–79% in a mesophilic AcoD of waste activated sludge and food waste.…”

Section: Resultssupporting

confidence: 87%

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

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“…Under conditions of high organic loading, both hydrolytic bacteria and acidogenic bacteria are generally growth and active, leading to an enhanced hydrolysis and acidogenesis of the organic substrate. An elevated levels of accumulated VFAs and a resulting low pH can suppress methanogens activity, thereby causing process failure [ 53 ]. The detected pH (6.09 ± 0.17) of the HRT of 20 days was lower than the suitable pH range of 6.5 − 7.5 recommended for maintaining a stable methane fermentation process [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Unlocking the potential of sugarcane leaf waste for sustainable methane production: Insights from microbial pre-hydrolysis and reactor optimization

Sitthikitpanya,

Ponuansri,

Jomnonkhaow

et al. 2024

Heliyon

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“…O uso da agitação mecânica aumentou a eficiência ao longo do ciclo do reator, permitindo a redução do tempo total do ciclo. Zhan et al (2022) avaliaram a co-digestão anaeróbia de resíduos provenientes de aviários e palha de trigo em um ASBR para a geração de biogás. A carga orgânica foi aumentada gradualmente, e o reator mostrou produção diária de biogás de 13,06 ± 0,21 L e teor de metano de 54,38 ± 0,53 %.…”

Section: Reatores Anaeróbios: Conceitos Tipos E Aplicaçõesunclassified

“…Nesse processo, a matéria orgânica é degradada por reações metabólicas na ausência de oxigênio molecular (HUERTAS, 2015). Diversos estudos, como os realizados por Disdale et al (1997), Myra et al (2015), Novita (2016), Del Nery et al (2018) e Zhan et al (2022), têm mostrado resultados promissores na aplicação de reatores anaeróbios no tratamento de efluentes líquidos agroindustriais. No entanto, é importante destacar que o processo anaeróbio apresenta uma eficiência reduzida na biodegradação de compostos complexos e cíclicos (KHAN et al, 2019;SANDHYA et al, 2019;LOUGHRIN et al, 2020).…”

Section: Introductionunclassified

Tratamento de água residuária da produção de café solúvel em ASBR com microaeração

Maia

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de eficiência de remoção de DQO, compostos fenólicos totais (CFT) e cinética de degradação da matéria orgânica. Contudo, C3 se destacou como a opção mais eficaz, uma vez que tratou a ARCS sob a maior carga orgânica volumétrica aplicada. Quando a microaeração foi aplicada, em comparação com C3, observou-se um aumento de 16,71% na remoção de DQO total, 14,85% na remoção de DQO solúvel e um notável incremento de 43,75% na remoção de CFT.A microaeração também influenciou o aumento da constante cinética de primeira ordem de degradação da matéria orgânica, bem como a redução das concentrações de sólidos suspensos.Em relação à remoção da cor, a contribuição da microaeração foi limitada, possivelmente devido à presença de compostos mais resistentes à degradação do que os degradados.Palavras-chaves: Microaeração. Digestão Anaeróbia. Compostos fenólicos. Intermitente. Volume de troca.

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Start-up of co-digestion of poultry litter and wheat straw in anaerobic sequencing batch reactor by gradually increasing organic loading rate: Methane production and microbial community analysis

Cited by 23 publications

References 39 publications

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

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

Unlocking the potential of sugarcane leaf waste for sustainable methane production: Insights from microbial pre-hydrolysis and reactor optimization

Tratamento de água residuária da produção de café solúvel em ASBR com microaeração

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