Effect of pH and VFA on Hydrolysis of Organic Solid Waste

Veeken, A.H.M.; Kalyuzhnyi, S.; Scharff, Heijo; Hamelers, H.V.M.

doi:10.1061/(asce)0733-9372(2000)126:12(1076)

Cited by 223 publications

(106 citation statements)

References 15 publications

(14 reference statements)

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“…Many factors, including substrate concentration, hydraulic retention time (HRT), temperature, pH, and process configuration, affect the performance of the acidogenesis phase (Veeken et al 2000;Jeong et al 2010). In conventional complete mixed digesters, HRT approaches the solid retention time (SRT).…”

Section: Effects On Acetogenesis Stagementioning

confidence: 99%

Effects of heavy metals as stress factors on anaerobic digestion processes and biogas production from biomass

Mudhoo

Kumar

2013

Int. J. Environ. Sci. Technol.

231

100

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Heavy metals affect the biochemical reactions that take place during anaerobic digestion processes of organic matter. In this review, the different effects observed in anaerobic digestion processes and during the production of biomethane and biohydrogen from several substrates contaminated with and/or inheriting heavy metals from the substrates themselves were discussed. It has been found that heavy metals exert important roles in biochemical reactions. Heavy metals like copper, nickel, zinc, cadmium, chromium and lead have been overwhelmingly reported to be inhibitory and under certain conditions toxic in biochemical reactions depending on their concentrations. Heavy metals like iron may also exhibit stimulatory effects, but these effects have been scantily observed. This review also concludes that the severity of heavy metal inhibition depends upon factors like metal concentration in a soluble, ionic form in the solution, type of metal species, and amount and distribution of biomass in the digester or chain of biochemical reactions which constitute the anaerobic digestion process. A majority of studies have demonstrated that the toxic effect of heavy metals like chromium, cadmium and nickel is attributable to a disruption of enzyme function and structure by binding of the metal ions with thiol and other groups on protein molecules or by replacing naturally occurring metals in enzyme prosthetic groups. This review has not found published data on the effects of heavy metals on the hydrolysis stage of anaerobic digestion process chemistry, and hence further studies are required to depict any changes.

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Section: Effects On Acetogenesis Stagementioning

confidence: 99%

Effects of heavy metals as stress factors on anaerobic digestion processes and biogas production from biomass

Mudhoo

Kumar

2013

Int. J. Environ. Sci. Technol.

231

100

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“…Anaerobic digestion begins with bacteria that hydrolyze complex organic polymers, such as carbohydrates, proteins, lipids and fats, into simple monomeric carbohydrates, amino acids, sugars and long chain fatty acids (LCFA) by extra cellular enzymes. Dry anaerobic digestion generally exhibited a poor startup performance as hydrolysis is a rate-limiting step (Ahn and Smith, 2008;Veeken and Hamelers, 1999;Veeken et al, 2000). The monomeric compounds are then converted by fermentative anaerobic bacteria into a mixture of VFAs and other minor products such as alcohol, carbon dioxide and hydrogen.…”

Section: Basics Of Anaerobic Digestion Processmentioning

confidence: 99%

Research advances in dry anaerobic digestion process of solid organic wastes

Jha¹,

Li²,

Nies³

et al. 2011

Afr. J. Biotechnol.

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The dry anaerobic digestion process is an innovative waste-recycling method to treat high-solidcontent bio-wastes. This can be done without dilution with water by microbial consortia in an oxygenfree environment to recover potential renewable energy and nutrient-rich fertilizer for sustainable solid waste management. It generally takes place at solid concentrations higher than 10% and enables a higher volumetric organic loading rate, minimal material handling, lower energy requirements for heating, limited environmental consequences and energetically effective performance. The long retention time, poor startup performance, incomplete mixing and the accumulation of volatile fatty acids (VFAs) are considered as the main disadvantages for the solid-state fermentation process. In order to develop feasible dry anaerobic digestion processes, it is important to review the optimization techniques and suggest possible areas where improvements could be made. These include reactor configuration, mixing, solid retention time, feedstocks, organic loading rate, inoculation, co-digestion, pretreatment, percolation, additives and environmental conditions within the digester such as temperature, pH, buffering capacity and VFAs concentration.

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“…Perhaps the retention time was too short. The role of pH has been discussed by other researchers (Zoetemeyer et al, 1982;Veeken et al, 2000), while Moosa et al (2006) demonstrated that inhibition of biological sulphate reduction is chiefly …”

mentioning

confidence: 98%

Use of compost bacteria to degrade cellulose from grass cuttings in biological removal of sulphate from acid mine drainage

Matshusa-Masithi¹,

Ogola²,

Chimuka³

2012

WSA

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The study focused on the use of compost bacteria to degrade cellulose from grass cuttings as energy and carbon sources for sulphate-reducing bacteria (SRB) in a biological reactor. The fermentation of grass cuttings was carried out by anaerobic bacteria isolated from compost, thereby producing volatile fatty acids (VFA) and other intermediates, which were used as carbon and energy sources for sulphate reduction by SRB. Grass was added daily to the reactor in order to obtain maximum production of chemical oxygen demand (COD) and VFA. The results indicated that daily addition of grass is essential for the efficient VFA production, sulphate reduction and for the cell growth of the microbial biomass. Sulphate reduction of 38% was achieved with an average reactor chemical oxygen demand/sulphate (COD/SO 4 ) ratio of 0.56 mg/ℓ. These results showed that 25 g of grass could produce enough VFA for a sulphate load of 25 g, which is a cost-effective method for sulphate removal.

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Effect of pH and VFA on Hydrolysis of Organic Solid Waste

Cited by 223 publications

References 15 publications

Effects of heavy metals as stress factors on anaerobic digestion processes and biogas production from biomass

Effects of heavy metals as stress factors on anaerobic digestion processes and biogas production from biomass

Research advances in dry anaerobic digestion process of solid organic wastes

Use of compost bacteria to degrade cellulose from grass cuttings in biological removal of sulphate from acid mine drainage

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