Coupled anaerobic–aerobic treatment of whey wastewater in a sequencing batch reactor : Proof of concept

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DOIResolve DOI: http://doi.org/10.2166/wst.2007.323
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TypeArticle
Journal titleWater Science & Technology
ISSN02731223
Volume55
Issue10
Pages201208; # of pages: 8
Subjectenv; anaerobic; coupling; SBR; treatment; wastewater; whey; acetates; bacteria, aerobic; bacteria, anaerobic; bioreactors; chromatography, gas; hydrogen; milk proteins; oxygen; pilot projects; waste disposal, fluid; water pollutants, chemical
AbstractA proof of concept was performed in order to verify if the coupling of anaerobic and aerobic conditions inside the same digester could efficiently treat a reconstituted whey wastewater at 21 ºC. The sequencing batch reactor (SBR) cycles combined initial anaerobic phase and final aerobic phase with reduced aeration. A series of 24 h cycles in 0.5 L digesters, with four different levels of oxygenation (none, 54, 108 and 182 mgO₂ per gram of chemical oxygen demand (COD)), showed residual soluble chemical oxygen demand (sCOD) of 683 ± 46, 720 ± 33, 581 ± 45, 1,239 ± 15 mg L⁻¹, respectively. Acetate and hydrogen specific activities were maintained for the anaerobic digester, but decreased by 10-25% for the acetate and by 20-50% for the hydrogen, in the coupled digesters. The experiment was repeated using 48 h cycles with limited aeration during 6 or 16 hours at 54 and 108 mgO₂gCOD⁻¹initial, displaying residual sCOD of 177 ± 43, 137 ± 38, 104 ± 22 and 112 ± 9 mg L⁻¹ for the anaerobic and the coupled digesters, respectively. The coupled digesters recovered after a pH shock with residual sCOD as low as 132 mg L⁻¹ compared to 636 mg L⁻¹ for the anaerobic digester. With regard to the obtained results, the feasibility of the anaerobic- aerobic coupling in SBR digesters for the treatment of whey wastewater was demonstrated.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
Identifier1026193x
NRC number49037
NPARC number3538639
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Record identifierc79e345f-9931-4c39-8dcf-cbc52b92d675
Record created2009-03-01
Record modified2016-05-09
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