Biodegradation of an aldehyde biocide in rotating biological contactors |
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Authors: | Lakkana Laopaiboon Niphaphat Phukoetphim Kanit Vichitphan Pattana Laopaiboon |
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Institution: | (1) Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen, 40002, Thailand;(2) Research Center for Environmental Hazardous Substance Management, Khon Kaen University, Khon Kaen, 40002, Thailand |
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Abstract: | Biodegradation of an aldehyde biocide, glutaraldehyde (GA), in a single-stage laboratory-scale rotating biological contactor
(RBC) was studied under biocide or organic loadings (OL) of 12–66 g COD m−2 day−1 and hydraulic retention times (HRT) of 0.6–3.0 h. Biofilms on the RBC were acclimated in 180 ppm GA at a hydraulic loading
(HL) of 0.18 m3 m−2 day−1 and the HRT of 0.60 h. The results showed that under a constant initial chemical oxygen demand (COD) concentration and sufficient
mineral salts available, the degree of GA removal in the RBC system was increased with either decreasing OL or increasing
HRT. After a period of acclimation, treatment efficiency in terms of GA removal by the RBC receiving GA as a sole carbon source
was 89%. The biofilms played an important role in biodegradation of biocide in the RBCs, whereas bio-oxidation of their planktonic
counterparts was totally inhibited in the presence of 50 ppm GA. The biochemical oxygen demand (BOD) test could be used as
an appropriate analytical procedure for investigating the efficiency of wastewater treatment units when seed was acclimated
and had adequate amount. |
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Keywords: | Acclimation Aldehyde biocide Biodegradation Biofilm RBC |
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