1Chapter 3 Aerobic Digestion

2011 ◽  
pp. 559-590
Keyword(s):  
Aerobic Digestion

Deep Shaft High Rate Aerobic Digestion: Laboratory and Pilot Plant Performance

1981 ◽  
Vol 16 (1) ◽  
pp. 71-90 ◽  
Author(s):  
F. Tran ◽  
D. Gannon
Keyword(s):  
Retention Time ◽  
Oxygen Transfer ◽  
Pilot Plant ◽  
High Rate ◽  
Plant Performance ◽  
High Solids ◽  
Aerobic Digestion ◽  
Volatile Solids ◽  
Solids Content ◽  
High Solids Content

Abstract The Deep Shaft process, originating from ICI Ltd. in the U.K., has been further developed by C-I-L Inc., Eco-Technology Division into an extremely energy efficient, high rate biological treatment process for industrial and municipal wastewaters. The Deep Shaft is essentially an air-lift reactor, sunk deep in the ground (100 - 160 m): the resulting high hydrostatic pressure together with very efficient mixing in the shaft provide extremely high oxygen transfer efficiencies (O.T.E.) of up to 90% vs 4 to 20% in other aerators. This high O.T.E. suggests real potential for Deep Shaft technology in the aerobic digestion of sludges and animal wastes: with conventional aerobic digesters an O.T.E. over 8% is extremely difficult to achieve. This paper describes laboratory and pilot plant Deep Shaft aerobic digester (DSAD) studies carried out at Eco-Research's Pointe Claire, Quebec laboratories, and at the Paris, Ontario pilot Deep Shaft digester. An economic pre-evaluation indicated that DSAD had the greatest potential for treating high solids content primary or secondary sludge (3-7% total solids) in the high mesophilic and thermophilic temperature range (25-60°C) i.e. in cases where conventional digesters would experience severe limitations of oxygen transfer. Laboratory and pilot plant studies have accordingly concentrated on high solids content sludge digestion as a function of temperature. Laboratory scale daily draw and fill DSAD runs with a 5% solids sludge at 33°C with a 3 day retention time have achieved 34% volatile solids reduction and a stabilized sludge exhibiting a specific oxygen uptake rate (S.O.U.R.) of less than 1 mgO2/gVSS/hour, measured at 20°C. This digestion rate is about four times faster than the best conventional digesters. Using Eco-Research's Paris, Ontario pilot scale DSAD (a 160 m deep 8 cm diameter u-tube), a 40% reduction in total volatile solids, (or 73% reduction of biodegradable VS) and a final SOUR of 1.2 mg02/gVSS/hour have been achieved for a 4.6% solids sludge in 4 days at 33°C, with loading rates of up to 7.9 kg VSS/m3-day. Laboratory runs at thermophilic temperatures (up to 60°C) have demonstrated that a stabilized sludge (24-41% VSS reduction) can be produced in retention time of 2 days or less, with a resulting loading rate exceeding 10 kg VSS/m3-day.

Sequential Anaerobic/Aerobic Digestion of Mixed Sludge from Annacis Island Wastewater Treatment Plant

2015 ◽  
Vol 2015 (19) ◽  
pp. 22-43
Author(s):  
Muneer Ahmad ◽  
Marco Abel Denee ◽  
Hao Jiang ◽  
Cigdem Eskicioglu ◽  
Paul Kadota ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Aerobic Digestion

Post Aerobic Digestion: Operational Experience from Three Full-Scale Facilities

2017 ◽  
Vol 2017 (13) ◽  
pp. 1554-1557
Author(s):  
Leon Downing ◽  
Cole Sigmon ◽  
John Kuosman ◽  
Orren West ◽  
Adam McClymont ◽  
...  
Keyword(s):  
Full Scale ◽  
Operational Experience ◽  
Aerobic Digestion

Thermal Hydrolysis Sidestreams: Treatment by Post Aerobic Digestion Versus Anammox

2016 ◽  
Vol 2016 (3) ◽  
pp. 258-281
Author(s):  
Heidi Bauer ◽  
Thomas D Johnson ◽  
Bruce R Johnson ◽  
David Oerke
Keyword(s):  
Thermal Hydrolysis ◽  
Aerobic Digestion

Characteristics of sludge reduction in an integrated pretreatment and aerobic digestion process

2006 ◽  
Vol 53 (7) ◽  
pp. 235-242 ◽  
Author(s):  
S. Hwang ◽  
H. Jang ◽  
M. Lee ◽  
J. Song ◽  
S. Kim
Keyword(s):  
Total Suspended Solid ◽  
Suspended Solid ◽  
Reduction Ratio ◽  
Effective Dosage ◽  
Ozone Treatment ◽  
Sludge Reduction ◽  
Aerobic Digestion ◽  
Cake Volume ◽  
Sludge Cake ◽  
Feasible Alternative

In this study, integrated pretreatments and aerobic digestion processes were investigated in order to provide a feasible alternative that can achieve effective sludge reduction. An ozone treatment in the presence of ionic manganese, a catalyst, increased the sludge reduction ratio three times higher than that of a single ozonation, presumably due to an increase in OH radical production. The ozone treatment yielded the effective sludge reduction ratio with an increasing ozone dosage, and an effective dosage of the catalyst was found to be 4 mg-Mn/g-TS. When a mechanical pretreatment and an ozone/catalyst were applied in a series, the integrated process, even at a half mechanical intensity and a half level of ozone dosage, showed higher and faster sludge reduction than each single process did. In addition, the integrated pretreatment process showed the highest dewaterability of the treated sludges. A ratio of sludge cake generation, which was newly introduced to quantify overall performance of sludge treatment processes, showed that the integrated pretreatment followed by the aerobic digestion yielded approximately a half of the sludge cake volume compared to the single aerobic digestion. Therefore, the integrated pretreatment can be a feasible method for the effective reduction of total suspended solid and the final volume.

VERTAD™, AUTO-THERMOPHILIC AEROBIC DIGESTION: PILOT TEST RESULTS

2001 ◽  
Vol 2001 (1) ◽  
pp. 1307-1322
Author(s):  
Mike Boyle ◽  
Larry Sasser ◽  
Jeff Guild ◽  
Dave Pollack
Keyword(s):  
Pilot Test ◽  
Test Results ◽  
Aerobic Digestion ◽  
Thermophilic Aerobic Digestion
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