Research Project to Remove Siloxanes From Digester Gas

Gary, Daniel; Acosta, Glenn; Kilgore, J.; Min, Seong Ki; Adams, Greg

doi:10.2175/193864701790861848

Cited by 6 publications

(9 citation statements)

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“…Observations of the Annacis Island WWTP have found siloxane-induced problems with the ERSs after a thermophilic digester was implemented (Annacis Island WWTP, 2004). Gary et al (2001) also observed a 60-300% increase in siloxane concentrations in thermophilic digesters from the concentration found in mesophilic digesters.…”

Section: Siloxanesmentioning

confidence: 66%

“…For the combined-cycle turbine system at the JWPCP, silicate and micro-crystalline quartz deposits caused fouling to occur in the tubing on the heat recovery steam generator unit and on the gas turbine blades (Gary et al, 2001). The tube fouling in the heat recovery system unit was of particular concern because the heat transfer efficiency was decreased.…”

Section: Impact On Energy Recovery Systemsmentioning

confidence: 99%

“…The tube fouling in the heat recovery system unit was of particular concern because the heat transfer efficiency was decreased. This resulted in an additional 340kg/hr (750 lb/h) of steam generation capacity loss (Gary et al, 2001).…”

Section: Impact On Energy Recovery Systemsmentioning

confidence: 99%

“…The HPLT system cools the digester gas, which contains 4.7ppm of siloxanes, to 4°C (40°F). The result is just over 50% of siloxane removal, leaving the digester gas with a siloxane concentration of approximately 2ppm (Gary et al, 2001).…”

Section: Siloxane Removal Techniquesmentioning

confidence: 99%

“…The test involved chilling the gas to -28°C (-19°F) and resulted in an additional 80% of the D4 and D5 siloxanes removal. When a 1-micron filter was added, nearly 100% removal was achieved (Gary et al, 2001).…”

Section: Siloxane Removal Techniquesmentioning

confidence: 99%

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Energy and Resource Recovery from Sludge

Kalogo

Monteith

2012

wio

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Section: Siloxanesmentioning

confidence: 66%

Section: Impact On Energy Recovery Systemsmentioning

confidence: 99%

Section: Impact On Energy Recovery Systemsmentioning

confidence: 99%

Section: Siloxane Removal Techniquesmentioning

confidence: 99%

Section: Siloxane Removal Techniquesmentioning

confidence: 99%

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Energy and Resource Recovery from Sludge

Kalogo

Monteith

2012

wio

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Biosolids and Sludge Management

Laha¹,

Parker²

2003

Water Environment Research

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This review section covers journal articles and conference papers related to biosolids and sludge management that were published in 2002. The literature review has been divided into the following sections:• Regulations and biosolids management planning,• Biosolids characteristics and measurement,• Odor issues,• Sludge treatment technologies, and • Disposal and reuse. The biosolids characteristics and measurement section includes stability, metals, nutrients, synthetic organics, and pathogens. An entire section was devoted to odor issues since a host of relevant papers were identified from the Water Environment Federation's Odors and Toxic Air Emissions 2002 Conference in Albuquerque, New Mexico. The sludge treatment technologies include: pretreatment, anaerobic digestion, aerobic digestion, dewatering, drying, composting, alkaline stabilization, and innovative treatments. A vast majority of the treatment papers relate to anaerobic digestion of sludge. The disposal and reuse section considers land filling and land application as disposal options. Much of the literature dealt with the agricultural land application of biosolids/sludge, so that this subsection is also fairly lengthy. Within land Literature Review 2003

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Conquering Siloxane in Digester Gas Fueled, Engine Driven Cogeneration Systems

Slezak¹,

Schettler²,

Rabitoy³

et al. 2002

proc water environ fed

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Organic silicon polymers (siloxanes) are increasing in use and are increasingly being detected at municipal sewage treatment facilities and landfills. Several forms of siloxanes are volatile and have been detected in gas evolved from the anaerobic digestion process at many publicly owned wastewater treatment plants (WWTPs). The presence of siloxane compounds in digester gas used to fuel internal combustion engines that generate electricity and heat power (cogeneration) causes severe engine maintenance problems that are related to silicon deposits in piston cylinder and valve head assemblies. At the Annacis Island WWTP in Vancouver, British Columbia and at the Alvarado WWTP in Union City, CA, siloxane related engine maintenance problems lead to decisions to terminate digester gas fueled engine operations.Both plants were motivated to quickly identify and implement systems to mitigate siloxane related engine maintenance problems. After quick review of available options, both plants implemented digester gas treatment systems consisting of gas dehumidification followed by activated carbon adsorption. Activated carbon systems were simple and relied on replacement of exhausted carbon as opposed to on-site regeneration. Activated carbon was extremely effective at eliminating siloxanes from digester gas and carbon life was as expected or better. Removal of siloxane resulted in reduction of build up of silicon in engine oil and dramatic improvements in engine operation as well as reduction in maintenance costs. Maintenance cost reductions greatly exceeded the cost of operating the siloxane removal system.

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Research Project to Remove Siloxanes From Digester Gas

Cited by 6 publications

References 0 publications

Energy and Resource Recovery from Sludge

Energy and Resource Recovery from Sludge

Biosolids and Sludge Management

Conquering Siloxane in Digester Gas Fueled, Engine Driven Cogeneration Systems

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