Factors influencing solid-state anaerobic digestion

Molnar, L.; Bartha, I.

doi:10.1016/0269-7483(89)90045-1

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…Excessive SRT could result in the excessive accumulation of digested materials in the digester, and the construction of a digester that is too large. [42] An optimum range of SRT for suspended growth digesters falls within the range 10-60 days, while attached growth and high-rate digesters can be operated at much shorter SRTs. [43] It was identified from the results that an OLR of 0.84 kg SS m −3 reactor d −1 operated with 12 days SRT is the most appropriate OLR for efficient and economical operation of the digester.…”

Section: Selection Of the Significant Olr And Srtmentioning

confidence: 99%

Biological pretreatment of non-flocculated sludge augments the biogas production in the anaerobic digestion of the pretreated waste activated sludge

Merrylin

Kumar

Kaliappan

et al. 2013

Environmental Technology

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High-efficiency resource recovery from municipal solid waste (MSW) has been a focus of attention. The objective of this research is to develop a bio-pretreatment process for application prior to the anaerobic digestion of MSW to improve methane productivity. Bacillus licheniformis was used for pretreating MSW (non-flocculated with 0.07% citric acid), followed by anaerobic digestion. Laboratory-scale experiments were carried out in semi-continuous bioreactors, with a total volume of 5 L and working volume of 3 L. Among the nine organic loading rates (OLRs) investigated, the OLR of 0.84 kg SS m(-3) reactor day(-1) was found to be the most appropriate for economic operation of the reactor. Pretreatment of MSW prior to anaerobic digestion led to 55% and 64% increase of suspended solids (SS) and volatile solids reduction, respectively, with an improvement of 57% in biogas production. The results indicate that the pretreatment of non-flocculated sludge with Bacillus licheniformis which consumes less energy compared to other pretreatment techniques could be a cost-effective and environmentally sound method for producing methane from MSW.

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Section: Selection Of the Significant Olr And Srtmentioning

confidence: 99%

Biological pretreatment of non-flocculated sludge augments the biogas production in the anaerobic digestion of the pretreated waste activated sludge

Merrylin

Kumar

Kaliappan

et al. 2013

Environmental Technology

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“…Several factors influence the biogas production efficiency including environmental conditions viz. pH, temperature, type of substrate, mixing pattern (Molnar and Bartha, 1989), and process inhibitory parameters viz. high organic loading, formation of high volatile fatty acids, inadequate alkalinity, etc.…”

Section: Introductionmentioning

confidence: 99%

Batch anaerobic digestion of simulated Bangladeshi food waste: methane production at different inoculum-to-substrate ratios and kinetic analysis

Tasnim

Behera²,

Zafar

et al. 2016

IJGW

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This study investigates the anaerobic biodegradation characteristics of a simulated Bangladeshi food waste. Biochemical methane potential experiments carried out in 500 mL batch digesters showed the methane yields of cooked meat, cooked fish, boiled rice, vegetable and mixed food waste (MFW) to be 541, 402, 319, 274 and 484 ml CH 4 /gVS, respectively. The biodegradability of 87%, 83%, 75%, 76% and 82% were obtained for cooked meat, cooked fish, boiled rice, vegetable and MFW, respectively. At mesophilic temperature (35°C), a maximum of 484.41 ml CH 4 /g VS was observed at an inoculum to substrate ratio (ISR) of 1 followed by 280, 166, 194 and 43 mL CH 4 /g VS at ISRs 10, 2, 0.1 and 0.05, respectively. The modified Gompertz model utilised for estimating the kinetic parameters of methane production revealed the maximum methane production rate as 16.02 ml CH 4 /g VS.d at an ISR of 1 with lag phase of 3.8 days.

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“…Too short an HRT will not allow sufficient time for anaerobic bacteria, especially the methane-forming bacteria, to metabolise the wastes. Too long an HRT could result in an excessive accumulation of digested materials in the digester, and construction of a digester which is too large [12]. An optimum range of HRT for suspended growth digesters falls within the range 10-60 days; while attached growth and high rate digesters can be operated at a much shorter HRT [13].…”

Section: Introductionmentioning

confidence: 99%

Improvement in the efficiency of hydrolysis of anaerobic digestion in sewage sludge by the use of enzymes

Rashed

Akunna

El-Halwany

et al. 2010

Desalination and Water Treatment

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The effects of enzymatic pre-treatment on a mixture of sludge (primary, secondary, digested) collected from different municipal wastewater-treatment plants was investigated by Batch experiments in the laboratory to enhance the hydrolysis of sludge. The experiments were carried out at mesophilic (37 C) temperature. Six commercially available enzymes, supplied by Novo Industries, were used which ware Alcalase, Caresyme, Celluclast, Lipolase, Termamyl and Viscosyme. The experiment showed that with 50% digested sludge and 0.1% enzyme dosage of Carezyme and the mixed enzymes there was 11.5% and 10.6% decrease in volatile solids (VS), whereas with 25% digested sludge and 0.1% Viscosyme enzyme was very much effective for VS reduction compared with the blank (it shows 16.3% higher than blank). In another set of experiments, which differed in sludge characteristics with 25% digested sludge and 0.5% enzyme dosage the culture containing the mixed enzymes presents the highest percentage of VS reduction among all the samples (13.6% higher than blank), where with 25% digested sludge and 0.5% enzyme dosage of Termamyl and mixed enzymes show 13.5% and 12.8% greater VS reduction respectively compared with the blank. The experimental work showed that enzymatic pre-treatment can be successfully used as a pre-treatment step for treating sludge mixture produced from municipal wastewater treatment plant and the performance of individual enzymes largely depends on the characteristics of sludge.

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Factors influencing solid-state anaerobic digestion

Cited by 10 publications

References 6 publications

Biological pretreatment of non-flocculated sludge augments the biogas production in the anaerobic digestion of the pretreated waste activated sludge

Biological pretreatment of non-flocculated sludge augments the biogas production in the anaerobic digestion of the pretreated waste activated sludge

Batch anaerobic digestion of simulated Bangladeshi food waste: methane production at different inoculum-to-substrate ratios and kinetic analysis

Improvement in the efficiency of hydrolysis of anaerobic digestion in sewage sludge by the use of enzymes

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