Fundamental science and engineering of the anaerobic digestion process for biogas production

Murphy, Jerry D.; Thamsiriroj, T.

doi:10.1533/9780857097415.1.104

Cited by 39 publications

(39 citation statements)

References 19 publications

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“…pH of the anaerobic digestion process is controlled by the bicarbonate acid-base system (Murphy and Thamsiriroj 2013). If the volatile acid concentration of the process increases, bicarbonate alkalinity will neutralize it.…”

Section: Figurementioning

confidence: 99%

“…If the volatile acid concentration of the process increases, bicarbonate alkalinity will neutralize it. Temperature affects the buffering capacity through the solubility of CO2; at lower temperatures, more CO2 dissolves and more bicarbonate ions are formed, which increases the buffering capacity (Murphy and Thamsiriroj 2013). Ammonia also has a role in the buffer system, as the hydrogen ions formed in the ionization reaction of ammonia are used in bicarbonate production (Murphy and Thamsiriroj 2013).…”

Section: Figurementioning

confidence: 99%

“…Temperature affects the buffering capacity through the solubility of CO2; at lower temperatures, more CO2 dissolves and more bicarbonate ions are formed, which increases the buffering capacity (Murphy and Thamsiriroj 2013). Ammonia also has a role in the buffer system, as the hydrogen ions formed in the ionization reaction of ammonia are used in bicarbonate production (Murphy and Thamsiriroj 2013). The pH requirement of the anaerobic digestion process is a compromise, as the optimal pH for acidogenic micro-organisms is 5.5-6.5, while for methanogens it is 7.8-8.2.…”

Section: Figurementioning

confidence: 99%

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Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Bayr

Kaparaju

Rintala

2013

Chemical Engineering Journal

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Esitetään Jyväskylän yliopiston matemaattis-luonnontieteellisen tiedekunnan suostumuksella julkisesti tarkastettavaksi yliopiston Ylistönrinteellä, salissa YAA303 toukokuun 23. päivänä 2014 kello 12.Academic dissertation to be publicly discussed, In this thesis, the anaerobic digestion of industrial by-products from meat and pulp and paper industry were studied. These materials, which are treated mainly like wastes, were seen to be potential substrates for anaerobic digestion. Methane yields of ca. 700 dm 3 kg volatile solids (VS)added -1 were obtained for slaughterhouse wastes, alone and in co-digestion with rendering wastes. On the other hand, methane yields of 190-240 dm 3 kgVSadded -1 were obtained in the monodigestion of pulp and paper industry primary sludge, and 150-170 dm 3 kgVSadded -1 in the co-digestion of primary sludge with secondary sludge. In the digestion of slaughterhouse and rendering wastes, mesophilic conditions were more stable, and the feasible organic loading rates (OLRs) were 1-1.5 kgVS m -3 d -1 and hydraulic retention times (HRTs) were 50 d. For pulp and paper mill wastewater sludge, thermophilic conditions were more stable with the feasible OLRs of 1-2 kgVS m -3 d -1 and the HRTs of 14-32 d. The digestion processes of these industrial by-products can easily turn unstable. In the digestion of slaughterhouse and rendering wastes, process imbalance may occur due to inhibition from intermediate products like volatile fatty acids, long-chain fatty acids and ammonia. On the contrary, in the digestion of pulp and paper mill wastewater sludge, the low nitrogen content and low pH may cause problems. It was observed that the more stable digestion process of slaughterhouse waste is achieved by additive of Co, Ni, Se, W, Fe and HCl. In addition, in pulp and paper mill secondary sludge digestion, hydrothermal pretreatment, among the studied 12 single or combined pre-treatments, increased the methane yield by 19-31 %. In conclusion, the digestion of two different kinds of industrial by-products was seen to be feasible, although operational conditions should be optimised and possibly enhancement methods used to ensure the stable digestion processes of these vulnerable organic materials.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Bayr

Kaparaju

Rintala

2013

Chemical Engineering Journal

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“…Food waste is usually mixed with cow rumen as it is needed to provide methanogens bacteria, which transform acetate acids, hydrogen, and carbon dioxides into methane [17]. The biogas production mechanism is likely to be a series of reactions in which a product from one reaction step is a material for another [18].…”

Section: Biogas Production From Food Wastementioning

confidence: 99%

Socio-Economic Considerations of Converting Food Waste into Biogas on a Household Level in Indonesia: The Case of the City of Bandung

Amir¹,

Hophmayer-Tokich

Kurnani

2015

Recycling

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Household waste is a serious environmental problem in Indonesia, especially in urban areas. Since 2010, biogas production from food waste has been introduced to reduce waste and provided an alternative to liquid petroleum gas (LPG) as cooking fuel in a pilot project in Bandung. Although the produced biogas is sufficient, the socio-economic aspects can hinder application. This study assesses the socio-economic feasibility of the project in Cibangkong, a typical urban area in Bandung, which includes four bio-digesters. The results show that the conversion of food waste into biogas is currently not economically feasible, mainly due to the low penetration of bio-slurry-a by-product commonly used for fertilizer-into local fertilizer supply-chains. From a social perspective, community acceptance is mainly influenced by procedural justice. Furthermore, while the produced biogas is perceived to be quite useful in substituting LPG, it has not yet been fully utilized due to low bio gas pressure and several technical failures, which in turn influence community acceptance of the digesters. It is thus concluded that introducing biogas production from waste to improve waste management and reduce LPG consumption OPEN ACCESSRecycling 2015, 1 62 can be feasible when efforts to support the market uptake of bio-slurry, enhance biogas utilization, and improve procedural justice performance, are taken.

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“…Organic fraction of solid waste, which is dominated the total waste generated (50%) (Tchobanoglous, et al, 1993) can lead to the methane emission (14.3% of total methane emissions) in the landfill (Feng, et al, 2014). In the other hand, the caloric value of methane which reaches ca 37.8 MJ / Mn3 (Murphy & Thamsiriroj, 2013) can be potentially recovered using anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

Optimization of methane production by combining organic waste and cow manure as feedstock in anaerobic digestion

Theresia

Priadi

2017

AIP Conference Proceedings

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Fundamental science and engineering of the anaerobic digestion process for biogas production

Cited by 39 publications

References 19 publications

Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Socio-Economic Considerations of Converting Food Waste into Biogas on a Household Level in Indonesia: The Case of the City of Bandung

Optimization of methane production by combining organic waste and cow manure as feedstock in anaerobic digestion

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