Journal
ENVIRONMENTAL TECHNOLOGY
Volume 31, Issue 5, Pages 511-521Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330903527898
Keywords
submerged anaerobic membrane bioreactor; kraft evaporator condensate; membrane fouling; biogas production; in-situ membrane cleaning
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Lakehead Biotechnology
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Submerged anaerobic membrane bioreactor (SAnMBR) technology was studied for kraft evaporator condensate treatment at 37 +/- 1 degrees C over a period of 9 months. Under tested organic loading rates of 1-24 kg COD/m(3)/day, a chemical oxygen demand (COD) removal efficiency of 93-99% was achieved with a methane production rate of 0.35 +/- 0.05 L methane/g COD removed and a methane content of 80-90% in produced biogas. Bubbling of recycled biogas was effective for in-situ membrane cleaning, depending on the biogas sparging rate used. The membrane critical flux increased and the membrane fouling rate decreased with an increase in the biogas sparging rate. The scanning electron microscopy images showed membrane pore clogging was not significant and sludge cake formation on the membrane surface was the dominant mechanism of membrane fouling. The results suggest that the SAnMBR is a promising technology for energy recovery from kraft evaporator condensate.
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