Journal of Civil and Environmental Engineering

Christian Drakides

Publications

• Research Article
  Acid production as a Limiting Factor during the Aerobic Biological PreTreatment of Confectionary Wastewaters
  Author(s): Christian Drakides and Meiling Lay-SonChristian Drakides and Meiling Lay-Son
  
  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 co.. Read More»
  DOI: 10.4172/2165-784X.1000128

  Abstract PDF