Elutriated acid fermentation of municipal primary sludge

Ahn, Youngho; Speece, Richard E.

doi:10.1016/j.watres.2006.03.022

Cited by 83 publications

(51 citation statements)

References 13 publications

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“…Increasing temperature improves PS hydrolysis and acidification [6,11,[15][16][17]. Zhang et al [18] observed the same results on activated sludge fermentation.…”

Section: Introductionmentioning

confidence: 63%

“…Ahn and Speece [6] obtained that the hydrolysis of COD had an asymptotic tendency, where most of the elutriated SCOD (78-84%) was produced within the initial 5 days of PS fermentation. However, many research workers have observed that SCOD began to decrease for high retention times (5-6 days) on PS fermentation [7,8] and WAS fermentation [9,10], due to beginning of methanogenesis.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Rubal

Torre

González

2012

International Journal of Chemical Engineering

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The aim of this research was to determine the influence of temperature, agitation, sludge concentration, and solids retention time (SRT) to obtain readily biodegradable organic matter on primary sludge (PS) fermentation, which would be used as substrate in a biological nutrient removal (BNR) process. Stirring and heating the sludge as well as increasing SRT improved the PS fermentation, producing a large amount of soluble chemical oxygen demand (SCOD). The influence of each operational parameter on PS hydrolysis was observed clearly. A great performance on SCOD production was obtained when the PS was stirred and heated for 3 days. However, PS concentration did not affect the fermentation. Sludge agitation is a simple process with minimal energy consumption. Warming the sludge is very interesting in those plants with anaerobic digestion, where heat energy is obtained from biogas. Therefore, PS fermentation can be improved with a minimum investment and leveraging existing resources in a wastewater treatment plant (WWTP). Fermenter volume can also be reduced if sludge is being heated and stirred during fermentation.

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“…Increasing temperature improves PS hydrolysis and acidification [6,11,[15][16][17]. Zhang et al [18] observed the same results on activated sludge fermentation.…”

Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Rubal

Torre

González

2012

International Journal of Chemical Engineering

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“…Cai et al [8] showed that the maximal hydrogen yield from sewage sludge occurred at an initial pH of 11.0. In an acid elutriation fermenter treating municipal primary sludge and slurry-type piggery waste, the maximal activity of hydrolysis and acidogenesis was pH 9 under both mesophilic (35 °C ) and thermophilic (55 °C ) conditions [9,10]. Under these conditions, the main reaction byproducts in the semi-continuous experiments were acetate, propionate and butyrate, and the ratio was 1:0.35-0.37:0.28-0.31 for mesophilic conditions and 1:0.23-0.36:0.16-0.28 for thermophilic conditions.…”

Section: Introductionmentioning

confidence: 99%

Biohydrogen Fermentation from Sucrose and Piggery Waste with High Levels of Bicarbonate Alkalinity

Choi

Ahn

2015

Energies

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This study examined the influence of biohydrogen fermentation under the high bicarbonate alkalinity (BA) and pH to optimize these critical parameters. When sucrose was used as a substrate, hydrogen was produced over a wide range of pH values (5-9) under no BA supplementation; however, BA affected hydrogen yield significantly under different initial pHs (5-10). The actual effect of high BA using raw piggery waste (pH 8.7 and BA 8.9 g CaCO3/L) showed no biogas production or propionate/acetate accumulation. The maximum hydrogen production rate (0.32 L H2/g volatile suspended solids (VSS)-d) was observed at pH 8.95 and 3.18 g CaCO3/L. BA greater than 4 g CaCO3/L also triggered lactate-type fermentation, leading to propionate accumulation, butyrate reduction and homoacetogenesis, potentially halting the hydrogen production rate. These results highlight that the substrate with high BA need to amend adequately to maximize hydrogen production.

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“…PO  Phosphorus mobilization in anaerobic sediments has been shown by experimental condition. The anaerobic reaction of biodegradation or novel fermentation processes using municipal sludge release mobilized phosphorus [17,18], however, release of inorganic phosphorus is inhibited by the presence of nitrate [19]. Similar to the anaerobic process of biodegradation, incubation of river or lake sediment produces phosphate ion under anaerobic condition [15,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Release from Sediments in a Riparian <i>Phragmites australis</i> Community at the Estuary of the Chikugogawa River, Western Japan

Haraguchi¹

2012

AJPS

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In order to determine the contribution of aquatic macrophyte communities on nutrition to sustain the high primary productivity of an estuary aquatic community, we analyzed the process of phosphorus release from sediments in aquatic macrophyte community in the estuary of the Chikugogawa River, South-Western Japan. Vertical profile of 3 4 PO  concentration and redox potential (Eh) of pore water in sediments were investigated within and outside the Phragmites australis community. Sediment horizon lower than 23 cm layer from the surface showed anaerobic (Eh < −200 mV) in the P. australis community, whereas sediment was constantly oxic (Eh > 0 mV) up to 50 cm depth outside the P. australis community without organic matter accumulation. Non-vegetated sediment with organic matter accumulation showed anoxic profile as vegetated site. concentration in anaerobic parts of sediment showed higher than oxic parts, and higher concentration in sediment pore water corresponded to sulfur deposition in sediment. Sulfate ion supplied from the sea water is reduced under the anoxic condition and S 2− reacts with water-insoluble phosphorus salts e.g. PO  to river water.

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Elutriated acid fermentation of municipal primary sludge

Cited by 83 publications

References 13 publications

Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Biohydrogen Fermentation from Sucrose and Piggery Waste with High Levels of Bicarbonate Alkalinity

Phosphorus Release from Sediments in a Riparian <i>Phragmites australis</i> Community at the Estuary of the Chikugogawa River, Western Japan

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Elutriated acid fermentation of municipal primary sludge

Cited by 83 publications

References 13 publications

Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation

Biohydrogen Fermentation from Sucrose and Piggery Waste with High Levels of Bicarbonate Alkalinity

Phosphorus Release from Sediments in a Riparian &lt;i&gt;Phragmites australis&lt;/i&gt; Community at the Estuary of the Chikugogawa River, Western Japan

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Phosphorus Release from Sediments in a Riparian <i>Phragmites australis</i> Community at the Estuary of the Chikugogawa River, Western Japan