Specific methanogenic activity of halophilic and mixed cultures in saline wastewater

Riffat, Rumana; Krongthamchat, Kannitha

doi:10.1007/bf03325889

Cited by 25 publications

(15 citation statements)

References 5 publications

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“…Chlorides are toxic to methanogenic microorganisms; they induce cell plasmolysis (an increase in the osmotic pressure and a consequent breakup of cells), and this effect has been studied by Riffat and Krongthamchat (2006).…”

Section: Efficiency Of the Removal Of Solids And Codmentioning

confidence: 99%

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

Cremonez

Feiden

Teleken

et al. 2016

SCA

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In this study, we compared cassava starch-based biodegradable polymers (PBMs) and glycerol (G) as additives used to increase biogas production from the co-digestion of swine wastewater (ARS). We chose to work with an inoculum comprising 40% (v/v) of the total volume of the reactor; this inoculum was obtained from a Canadian model digester for treating swine waste. In the anaerobic digestion process, batch reactors were used on a laboratory scale with a total volume of approximately 4 L and a working volume of 3.2 L. Three treatments were conducted to compare the efficiency of solid removal, the chemical oxygen demand (COD), and the production of biogas. The first treatment contained only swine waste; the second included the addition of glycerol at 1, 3, and 5% (w/v); and the third treatment included the addition of 1, 3, and 5% (w/v) of PBM residue in relation to the swine wastewater. From the results, it can be concluded that higher yields were obtained for the treatment with 3% PBM and 1% glycerol. Most treatments showed high removal rates of total solids and total volatile solids. Reductions lower than 70% were obtained only for treatments with PBM and glycerol at a ratio of 5%. Key words: Additives. Alternative fuels. Biodegradable polymers. Glycerol. ResumoO presente trabalho tem por finalidade comparar o potencial aditivo no aumento da produção de biogás de polímeros biodegradáveis a base de fécula de mandioca (PBM) e do glicerol, já comumente empregado com essa finalidade, ambos em co-digestão com água residuária de suinocultura. Utilizouse como matéria-prima para produção de biogás, água residual de suinocultura, material plástico biodegradável produzido a partir de fécula de mandioca e glicerina bruta proveniente do processo de produção de biodiesel. Optou-se por trabalhar com 40% (v/v) de inóculo do volume total do reator. Para a condução do processo de digestão anaeróbia empregaram-se reatores com alimentação batelada de escala laboratorial de volume total de aproximadamente 4 litros e volume útil de 3,2 litros. Foram realizados 3 tratamentos visando comparar a eficiência da remoção de sólidos, demanda química de oxigênio e produção de biogás. O primeiro tratamento conteve apenas resíduo de suíno, o segundo a adição de glicerol em percentuais de 1, 3 e 5% (m/v) no mesmo resíduo e o terceiro a adição de 1, 3 e 5% (m/v) do polímero biodegradável a base de fécula de mandioca ao resíduo suíno. A partir dos resultados pode-se concluir que as maiores produções foram obtidas no tratamento de 3% de PBM e 1% de glicerol. A maioria dos tratamentos apresentou elevadas taxas de remoção de sólidos totais e sólidos totais voláteis. Apenas os tratamentos com PBM e glicerol na proporção de 5% obtiveram reduções inferiores a 70%. Palavras-chave: Aditivos. Glicerol. Polímeros biodegradáveis. Combustíveis alternativos.

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Section: Efficiency Of the Removal Of Solids And Codmentioning

confidence: 99%

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

Cremonez

Feiden

Teleken

et al. 2016

SCA

View full text Add to dashboard Cite

show abstract

“…Although the results have shown that the addition of glycerol may favorably contribute for anaerobic process co-digestion, authors generally agree that different substrates must be combined under strict control due to initial organic load increase and mixture content of inhibitory as well as elements toxic to microorganism metabolism [9][10][11]. Carmona et al [12] and Viana et al [13] report that glycerol may present up to 46 g chloride/L, while a concentration between 5 and 9 g chloride/L is considered inhibitory for methanogenesis [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Methane Production Based on Mixture Content of Sewage Sludge, Food Waste, and Glycerol

Ferreira¹,

Cammarota²,

Volschan³

2017

JEPE

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This paper presents bench scale experiments related to anaerobic co-digestion of aerobic sewage sludge from a pilot WWTP (waste water treatment plants), raw glycerol from a biodiesel industry and food waste. Assays were conducted in 100 mL non-stirring penicillin vessels, at 30 °C and planned according to three optimization phases: (1) binary mixture of sewage sludge and FW (food waste); (2) binary mixture of sewage sludge and glycerol; and (3) ternary mixture of sewage sludge, FW, and glycerol. In the first and second phases, the highest SMP (specific methane production) was achieved by 10% (v/v) FW and 0.5% (v/v) glycerol mixtures. The optimization of the ternary mixture during the third phase was reached by the combination of 10% (v/v) FW and 0.4% (v/v) glycerol. Despite the low SMP value, the addition of glycerol and FW contributed to doubling the SMP value of the sludge sample control.

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“…In many studies, the treatment technology for high salt or saline effluent has been studied for COD removal in laboratory scale digesters and pilot scale digesters [3][4][5][6][7][8][9][10][11][12] . Sodium ions (Na + ) appears to be essential for methanogenic bacteria due to its roles in a chemiosmotic coupling mechanism and 230 mg Na + L −1 or 10 mM was suggested as the optimal concentration for acetolastic methanogens in waste treatment process [3] .…”

Section: Introductionmentioning

confidence: 99%

Co-Digestion of Palm Oil Mill Effluent and Refined Glycerin Wash Water for Chemical Oxygen Demand Removal and Methane Production

Sulaiman¹,

Zakaria²,

Hassan³

et al. 2009

American J. of Environmental Sciences

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Problem statement: Refined Glycerin Wash Water (RGWW) from the oleochemical industry contains high Chemical Oxygen Demand (COD) and requires proper treatment before disposal. Unfortunately the wash water also contains high concentration of sodium chloride (NaCl) that could cause inhibition to the normal biological treatment process. However, there is feasibility of co-digesting the RGWW and Palm Oil Mill Effluent (POME) for its treatment and methane recovery. Approach: A large 500 m³ semi-commercial closed digester tank was used to study the effect of co-digesting POME and RGWW under mesophilic condition at different RGWW percentage. The digester performance in terms of COD removal efficiency and methane production rate and stability based on total Volatile Fatty Acids (VFA) accumulation, Mixed Liquor Volatile Suspended Solid (MLVSS) and pH were evaluated. Results: At 1.0% of RGWW co-digested, both COD removal efficiency and methane production rate showed satisfactory results with higher than 90% and 505 m³ day^-1, respectively. However, once the percentage was increased to a maximum of 5.25%, COD removal efficiency remains high but the methane production rate reduced significantly down to 307 m³ day^-1. At this stage, the digester was already unstable with high total VFA recorded of 913 mg L^-1 and low cells concentration of 8.58 g L^-1. This was probably due to the effect of plasmolysis on the methanogens at high concentration of NaCl in the digester of nearly 4000 mg L^-1. Conclusion: Co-digesting of RGWW with high NaCl content and POME is satisfactory for COD removal but not for increasing the methane production.

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Specific methanogenic activity of halophilic and mixed cultures in saline wastewater

Cited by 25 publications

References 5 publications

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

Optimization of Methane Production Based on Mixture Content of Sewage Sludge, Food Waste, and Glycerol

Co-Digestion of Palm Oil Mill Effluent and Refined Glycerin Wash Water for Chemical Oxygen Demand Removal and Methane Production

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