Potential biogas scrubbing using a high rate pond

The potential to scrub biogas in a high rate pond (HRP) was evaluated using apparatus designed to maximize gas-liquid contact. Experiments compared the removal of carbon dioxide from synthetic biogas by an "in-pond angled gutter" to that by a simulated "counter-current pit." Resu...

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Bibliographic Details
Published in:Water science and technology 2005-01, Vol.51 (12), p.253-256
Main Authors: Mandeno, G, Craggs, R, Tanner, C, Sukias, J, Webster-Brown, J
Format: Article
Language:English
Subjects:
Agriculture
Algae
Algal growth
Anaerobic digestion
Anaerobic treatment
Bacteria, Anaerobic - physiology
Biogas
Bubbles
Carbon dioxide
Carbon Dioxide - metabolism
Carbon dioxide removal
Cities
Coalescence
Coalescing
Composition
Eukaryota - growth & development
Explosive forming
Facility Design and Construction
Gas exchange
Gases
Hydrogen Sulfide - metabolism
Hydrogen-Ion Concentration
Industrial Waste
Methane - metabolism
Municipal wastewater
Oxygen
Oxygen - metabolism
Ponds
Purification
Removal
Sewage - chemistry
Sewage - microbiology
Supersaturation
Washing
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Water Pollution - prevention & control
Water purification
Water Purification - methods
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Summary:The potential to scrub biogas in a high rate pond (HRP) was evaluated using apparatus designed to maximize gas-liquid contact. Experiments compared the removal of carbon dioxide from synthetic biogas by an "in-pond angled gutter" to that by a simulated "counter-current pit." Results showed that the counter current pit has potential for use in biogas scrubbing, with synthetic biogas carbon dioxide composition consistently reduced from 40% to < 5%. The in-pond angled gutter was less effective due to bubble coalescence which reduced the total bubble surface area available for gas transfer. Measurement of oxygen levels in the scrubbed biogas showed that despite supersaturation of oxygen in the HRP water, there was little transfer to the biogas, so that explosive methane/oxygen mixtures would not be formed. Theoretical calculations indicated that the amount of biogas likely to be formed during anaerobic treatment of municipal wastewater could be scrubbed in the HRP of the same advanced pond system with little influence on HRP pH, algal growth and treatment performance. These encouraging results justify further research on this method of biogas purification.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2005.0476