alexa Acid production as a Limiting Factor during the Aerobic
ISSN: 2165-784X

Journal of Civil & Environmental Engineering
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Research Article

Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters

Christian Drakides* and Meiling Lay-Son
Hydrosciences Laboratory, Université Montpellier II, 34095 Montpellier cedex 05, France
Corresponding Author : Meiling Lay-Son
Hydrosciences Laboratory
Université Montpellier II
34095 Montpellier cedex 05, France
Tel: 33467143624
Fax: 33467144774
Received January 11, 2013; Accepted May 22, 2013; Published June 02, 2013
Citation: Drakides C, Lay-Son M (2013) Acid production as a Limiting Factor during the Aerobic Biological Pre-Treatment of Confectionary Wastewaters. J Civil Environ Eng 3:128. doi:10.4172/2165-784X.1000128
Copyright: © 2013 Drakides C, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The treatment of confectionary wastewaters by a biological aerobic treatment plant encountered strong failures when wastewaters concentration exceeded 30 g/l of chemical oxygen demand (COD), although the COD inlet flow remained under design specifications. Treatment performances stayed under 50%, and strong acid production and Hydrogen potential drop lead to heavy corrosion of equipments. During a laboratory scale study using the same organic load, with residence times ranging from 1 to 15 days, Hydrogen potential (pH) drop proved to be caused mainly by aerobic production of organic acids from sugars, leading thus to an auto-inhibiting process. The study demonstrated the influence of pH, acids and aeration rate upon key parameters as respiration rates and degradation kinetics. A reduction of 30 to 35 g/l of COD was obtained in laboratory scale reactors with pH and oxygen control. A comparison between the laboratory scale reactors and the full scale plant was made by measuring in the reactors the clean water oxygenation transfer rates and comparing its values to the data issuing from the plant. Compared to the data issuing from the full-scale wastewater treatment plant, the results of this study allowed giving recommendations for its upgrade.


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