Volatile Fatty Acid Production from Organic Fraction of Municipal Solid Waste Through Anaerobic Acidogenic Digestion

Doğan, Eylem; Demirer, Göksel N.

doi:10.1089/ees.2009.0062

Cited by 28 publications

(16 citation statements)

References 29 publications

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“…For biomass, an empirical molecular formula of C 5 H 7 NO 2 that corresponded to a conversion factor of 1.42 g O 2 /g for biomass was assumed [19].…”

Section: Calculationsmentioning

confidence: 99%

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

et al. 2017

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Abstract:In this work, hardwood sulfite spent liquor (HSSL)-a by-product from a pulp and paper industry-was used as substrate to produce short-chain organic acids (SCOAs) through acidogenic fermentation. SCOAs have a broad range of applications, including the production of biopolymers, bioenergy, and biological removal of nutrients from wastewaters. A continuous stirred tank reactor (CSTR) configuration was chosen to impose selective pressure conditions. The CSTR was operated for 88 days at 30 • C, without pH control, and 1.76 days of hydraulic and sludge retention times were imposed. The culture required 46 days to adapt to the conditions imposed, reaching a pseudo-steady state after this period. The maximum concentration of SCOAs produced occurred on day 71-7.0 g carbon oxygen demand (COD)/L that corresponded to a degree of acidification of 36%. Acetate, propionate, butyrate, valerate, and lactate were the SCOAs produced throughout the 88 days, with an average proportion of 59:17:19:1.0:4.0%, respectively.

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“…For biomass, an empirical molecular formula of C 5 H 7 NO 2 that corresponded to a conversion factor of 1.42 g O 2 /g for biomass was assumed [19].…”

Section: Calculationsmentioning

confidence: 99%

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

et al. 2017

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“…Finally, an increased concentration of the sludge can enhance the hydrolysis due to overload shock [29].…”

Section: Factors Affecting Improvement In Fermentation Capacitymentioning

confidence: 99%

Increased carboxylate production in high-rate activated A-sludge by forward osmosis thickening

Cagnetta

D’Haese

Coma

et al. 2017

Chemical Engineering Journal

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Domestic wastewater represents a considerable feedstock for organics but the high dilution makes their recovery typically unsuccessful. Here we investigated three routes to 10-fold concentrate the organics using Forward Osmosis (FO) (Draw solution (DS) 2.2 M MgCl 2): directly on domestic wastewater, Asludge, or secondary sludge, with the end goal of increasing volatile fatty acid (VFA) yield from subsequent 9-day fermentation tests. Forward osmosis concentrated the total COD by a factor of 8.2 ± 1.2, 10.1 ± 2.4 and 4.8 ± 0.2 with respect to the raw streams of wastewater, secondary sludge and Asludge. The soluble fraction of the COD was concentrated up to 3.5 times in the A-sludge and 2.1 times in the secondary sludge; the result of a combined effect of the chemical action of Mg 2+ (diffused from the DS) on sludge disaggregation and cell lysis, and the physical action of recirculation and air-scouring of the A-sludge in the FO-unit. The FO-concentrated A-sludge produced 445 ± 22 mg COD-VFA g-1 COD fed , which was 4.4 times higher than for the untreated A-sludge. No VFA were produced from untreated secondary sludge, but after FO-concentration 71 ± 5 mg COD-VFA g-1 COD fed could be reached. Due to the low organics in wastewater even after FO-concentration (1.08 ± 0.08 g COD L-1), no notable VFA production occurred. The combination of A-stage technology and membrane technology for dewatering and COD concentration could be a key advancement to increase VFA production from domestic wastewater, whereby at least 45% of the COD can be recovered as valuable VFA.

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“…However, the biogas production decreased dramatically when the organic matter content increased to 8%, and the process even stopped when the load reached 10% of total solids. This behavior could be attributed to the rapid conversion of the substrate into volatile fatty acids (VFA), and their accumulation inhibits the activity of the methanogenic microorganisms [7,27]. As the amount of loaded substrate increases, the degradation of VFA into acetate, hydrogen and carbon dioxide is significantly augmented, while the degrading activity of the methanogenic microorganisms that use acetate and hydrogen does not increase at the same rate [7,27,28].…”

Section: Anaerobic Digestion Of Fvwmentioning

confidence: 99%

“…This behavior could be attributed to the rapid conversion of the substrate into volatile fatty acids (VFA), and their accumulation inhibits the activity of the methanogenic microorganisms [7,27]. As the amount of loaded substrate increases, the degradation of VFA into acetate, hydrogen and carbon dioxide is significantly augmented, while the degrading activity of the methanogenic microorganisms that use acetate and hydrogen does not increase at the same rate [7,27,28]. In fact, if hydrogen accumulates, acidogenesis gets partially inhibited causing disproportion in the methanogenic reactions which results in cessation of methane production [7,27].…”

Section: Anaerobic Digestion Of Fvwmentioning

confidence: 99%

“…The pH values in the effluent of the semi-continuous bioreactors dropped during the first three days of the experiment from 7 to 6. According to studies published in the literature, in the early days of AD process the concentration of VFA increases, probably causing acidification in the bioreactor [2,7,27]. This happens because the microorganisms are not able to remove organic acids and hydrogen at the same rate they are being produced.…”

Section: Anaerobic Digestion Of Fvwmentioning

confidence: 99%

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Digestión anaeróbica de desechos de frutas y hortalizas en reactores semicontinuos de un mercado municipal en Tumbaco, Ecuador

Castelo

Peñafiel

Ochoa‐Herrera

2014

Av. Cienc. Ing. (Quito)

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En Ecuador se generan una gran cantidad de residuos orgánicos. En el año 2010, el promedio de recolección de desechos en el Distrito Metropolitano de Quito fue de aproximadamente 1500 t por día, de los cuales más del 60% fueron identificados como residuos orgánicos. Los rellenos sanitarios que son comúnmente empleados en el país para el tratamiento de desechos generan grandes problemas al medio ambiente y a la salud pública. El tratamiento biológico de residuos orgánicos bajo condiciones anaerobias constituye una alternativa viable para estabilizar la materia orgánica, proteger el medio ambiente y reducir el riesgo de afección a la salud pública; adicionalmente, se generan productos con valor agregado como son el biogás y el fertilizante orgánico que pueden ser empleados como fuente de energía alternativa y en las actividades agrícolas, respectivamente. En el presente trabajo de investigación, el tratamiento anaeróbico de residuos sólidos de frutas y vegetales (RFV) del mercado central de Tumbaco fue estudiado en cuatro biorreactores de 4L en modo de operación semi-continuo escala laboratorio. En primer lugar los RFV fueron caracterizados para ser utilizados como materia prima en el proceso de digestión anaeróbica. A continuación, los biorreactores fueron incubados con 10% de inóculo microbiano preparado y diferentes porcentajes en peso de residuos de frutas y vegetales con el fin de identificar la concentración optima de carga orgánica. La composición del inoculo microbiano preparado fue 40% de lodos granulares provenientes del biodigestor de una planta de tratamiento de aguas de la ciudad de Quito y 90% (v/v) de estiércol vacuno disuelto. Los biodigestores mesófilos de mezcla completa fueron alimentaron con diferentes porcentajes en peso de RFV equivalentes a 5, 7.5, 10 and 12.5% sólidos totales. Los bioreactores fueron operados durante 90 días en tres períodos correspondientes a las diferentes alimentaciones. La mayor produccion acumulada de metano se alcanzó con el biorreactor alimentado con 5% RFV registrando un valor de 2401.90 L CH4 kg SV-1. Finalmente, una tecnología efectiva de digestión anaerobia fue exitosamente desarrollada como alternativa a los rellenos sanitarios para el tratamiento de residuos orgánicos municipales en Ecuador.

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Volatile Fatty Acid Production from Organic Fraction of Municipal Solid Waste Through Anaerobic Acidogenic Digestion

Cited by 28 publications

References 29 publications

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

Increased carboxylate production in high-rate activated A-sludge by forward osmosis thickening

Digestión anaeróbica de desechos de frutas y hortalizas en reactores semicontinuos de un mercado municipal en Tumbaco, Ecuador

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