scholarly journals Effects of Thermal Treatment of Waste Activated Sludge and Trace Metals on the High-rate Thermophilic Anaerobic Digestion of Sewage Sludge

2012 ◽  
Vol 68 (7) ◽  
pp. III_307-III_315
Author(s):  
Masanobu TAKASHIMA ◽  
Eri NAKAKIHARA ◽  
Ryoko IKEMOTO
Keyword(s):  
Anaerobic Digestion ◽  
Trace Metals ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Activated Sludge ◽  
High Rate ◽  
Waste Activated Sludge ◽  
Thermophilic Anaerobic Digestion

Modified ADM1 disintegration/hydrolysis structures for modeling batch thermophilic anaerobic digestion of thermally pretreated waste activated sludge

2009 ◽  
Vol 43 (14) ◽  
pp. 3479-3492 ◽  
Author(s):  
Ivan Ramirez ◽  
Alexis Mottet ◽  
Hélène Carrère ◽  
Stéphane Déléris ◽  
Fabien Vedrenne ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Thermophilic Anaerobic Digestion

Improvement of the thermophilic anaerobic digestion and hygienisation of waste activated sludge by synergistic pretreatment

2019 ◽  
Vol 54 (7) ◽  
pp. 694-700 ◽  
Author(s):  
Klaudiusz Grübel ◽  
Stanisław Wacławek ◽  
Mariusz Kuglarz ◽  
Maria Wacławek ◽  
Miroslav Černík
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Thermophilic Anaerobic Digestion

Pretreatment followed by anaerobic digestion of secondary sludge for reduction of sewage sludge volume

2013 ◽  
Vol 67 (11) ◽  
pp. 2527-2533 ◽  
Author(s):  
Naoki Abe ◽  
Yue-Qin Tang ◽  
Makoto Iwamura ◽  
Shigeru Morimura ◽  
Kenji Kida
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Low Pressure ◽  
Gas Production ◽  
Wet Oxidation ◽  
Thermophilic Anaerobic Digestion ◽  
Sludge Pretreatment ◽  
Secondary Sludge ◽  
Digestion Efficiency

The influence of two pretreatment methods, thermal treatment and low-pressure wet oxidation, on the sludge digestion efficiency was examined. Batch thermophilic anaerobic digestion was used to evaluate the effectiveness of the pretreatment methods in terms of volatile suspended solids (VSS) digestion efficiency and gas production. The results showed that the gas production was not proportional to the VSS degradation efficiency of either thermal treatment or low-pressure wet oxidation. Low-pressure wet oxidation treatment at 150 °C along with 40% of the theoretical oxygen required to oxidize organic carbon gave the highest gas production and the VSS digestion efficiency of 77% at a VSS loading rate of 8 g l−1 d−1. The digestion efficiency was about 30% higher than that of thermophilic anaerobic digestion without sludge pretreatment. Sewage sludge could be treated effectively at a high VSS digestion efficiency with this pretreatment followed by thermophilic anaerobic digestion.

scholarly journals Methanosarcinaceae and Acetate-Oxidizing Pathways Dominate in High-Rate Thermophilic Anaerobic Digestion of Waste-Activated Sludge

2013 ◽  
Vol 79 (20) ◽  
pp. 6491-6500 ◽  
Author(s):  
Dang P. Ho ◽  
Paul D. Jensen ◽  
Damien J. Batstone
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Retention Time ◽  
Elevated Temperatures ◽  
Stable Carbon Isotope ◽  
High Rate ◽  
Continuous Reactor ◽  
Waste Activated Sludge ◽  
Acetate Oxidation ◽  
Syntrophic Acetate Oxidation

ABSTRACTThis study investigated the process of high-rate, high-temperature methanogenesis to enable very-high-volume loading during anaerobic digestion of waste-activated sludge. Reducing the hydraulic retention time (HRT) from 15 to 20 days in mesophilic digestion down to 3 days was achievable at a thermophilic temperature (55°C) with stable digester performance and methanogenic activity. A volatile solids (VS) destruction efficiency of 33 to 35% was achieved on waste-activated sludge, comparable to that obtained via mesophilic processes with low organic acid levels (<200 mg/liter chemical oxygen demand [COD]). Methane yield (VS basis) was 150 to 180 liters of CH4/kg of VSadded. According to 16S rRNA pyrotag sequencing and fluorescence in situ hybridization (FISH), the methanogenic community was dominated by members of theMethanosarcinaceae, which have a high level of metabolic capability, including acetoclastic and hydrogenotrophic methanogenesis. Loss of function at an HRT of 2 days was accompanied by a loss of the methanogens, according to pyrotag sequencing. The two acetate conversion pathways, namely, acetoclastic methanogenesis and syntrophic acetate oxidation, were quantified by stable carbon isotope ratio mass spectrometry. The results showed that the majority of methane was generated by nonacetoclastic pathways, both in the reactors and in off-line batch tests, confirming that syntrophic acetate oxidation is a key pathway at elevated temperatures. The proportion of methane due to acetate cleavage increased later in the batch, and it is likely that stable oxidation in the continuous reactor was maintained by application of the consistently low retention time.

High rate mesophilic, thermophilic, and temperature phased anaerobic digestion of waste activated sludge: A pilot scale study

2012 ◽  
Vol 32 (6) ◽  
pp. 1196-1201 ◽  
Author(s):  
David Bolzonella ◽  
Cristina Cavinato ◽  
Francesco Fatone ◽  
Paolo Pavan ◽  
Franco Cecchi
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Pilot Scale ◽  
High Rate ◽  
Waste Activated Sludge
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