Advanced Oxidation Process

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Advanced oxidation processes (abk. AOP ), also called advanced oxidation , refers to a series of processes for the chemical treatment of organic and inorganic substances in waste water through oxidation .

In AOP, this is done with the help of ozone , hydrogen peroxide or a combination of these processes with UV radiation (UV oxidation). The oxidation is carried out directly by these substances, reaction products of these substances with one another and, in particular, via the resulting radicals, such as. B. OH radicals ( hydroxyl radicals ) causes.

The AOP process is used in particular for cleaning substances that are difficult to biodegrade or that are not biodegradable (e.g. pesticides , biocides or pharmaceuticals ) in wastewater. Most of the pollutants are converted into stable inorganic compounds such as H 2 O, CO 2 and salts . The aim of wastewater treatment using the AOP process is to reduce the chemical oxygen demand, as well as to discolor and change other parameters in order to achieve limit values ​​that enable purified wastewater to be discharged directly into receiving waters . Advanced oxidation processes are also often used to pretreat heavily polluted wastewater flows so that they can then be processed in an existing, often biological, wastewater treatment system. These combinations are particularly economical with bio-toxic or very refractory wastewater. Well-functioning AOPs also place high demands on the choice of material due to their strong oxidizing effect.

Another area of ​​application is residual discoloration in the so-called recycling of production waste water containing dyestuff.

See also

literature

  • Michael Ed. Roth: Chemical Oxidation: Technology for the Nineties, Volume VI: Technologies for the Nineties: 6 (Chemical Oxidation) . Edited by: W. Wesley Eckenfelder and John A. Roth, Technomic Publishing Co, Lancaster u. a. 1997, ISBN 1-56676-597-8 . (engl.)
  • Thomas Oppenländer: Photochemical purification of water and air: advanced oxidation processes (AOPs): principles, reaction mechanisms, reactor concepts . Wiley-VCH, Weinheim 2003, ISBN 3-527-30563-7 . (engl.)
  • Martin Sörensen: Photochemical Degradation of Hydrophilic Synthesis Products, Dissertation, 1996 (German)