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Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures

Paper ID Volume ID Publish Year Pages File Format Full-Text
34238 45011 2016 14 PDF Available
Title
Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures
Abstract

•Evaluated in-situ CO2 sequestration during batch anaerobic digestion of sewage sludge.•Mineral carbonation using olivine may be a cheaper alternative for biogas upgrading.•Increased temperature, elevating the olivine and increased surface area increases removal of CO2.•Achieved up to 22% CO2 sequestration at ambient temperature and 17.5% at mesophilic temperature.

Biogas from anaerobic digestion of sludge at wastewater treatment plants consists of methane, carbon dioxide and trace contaminants which can be upgraded for utilization. Compared to current costly upgrading technologies, mineral carbonation has many benefits by using natural magnesium and calcium rich ores capable of sequestering CO2. The feasibility of olivine to sequester CO2 in-situ during batch anaerobic digestion of sludge was tested for (1) ambient versus mesophilic temperatures, (2) placement of olivine in the digester, and (3) olivine particle size and concentration. Increasing the temperature, increasing the olivine surface area via increased dose and decreased particle size, and elevating the olivine in the reactor increased mineral carbonation rates during anaerobic digestion. At mesophilic temperature, the elevated 5% w/v fine olivine digester had a 17.5% reduction in CO2 which equated to a 3.6% increase in methane content (%) and at ambient temperature, the same condition had a 21.7% CO2 sequestration resulting in an 8.8% increase in methane content compared to the control. Response surface methodology was applied for optimization of digestion time and olivine surface area at both temperatures.

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Keywords
Anaerobic digestion; Carbon sequestration; Mineral carbonation; Biogas upgrading; Olivine; Wastewater treatment plants
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Effect of particle size and doses of olivine addition on carbon dioxide sequestration during anaerobic digestion of sewage sludge at ambient and mesophilic temperatures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 51, Issue 1, January 2016, Pages 59–72
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us