Ozonisation coupled with biological degradation for treatment of phenolic pollutants: a mechanistically based study.
Phenolic acids constitute an important group of pollutants which are reluctant to biological treatment. Solutions containing a mixture of cinnamic acid, p-coumaric acid, caffeic acid and ferulic acid were submitted to ozonisation. Then, the changes in biodegradability along the process were studied by means of respirometry. There is an optimum ozone dosage in the interval 3-5 min of treatment which allows to achieve the maximum increase in biodegradability (more than 10 times) and a high efficiency of the ozonisation process (COD decreases to a half of its initial value). Further ozonisation does not help to increase biodegradability and is clearly disadvantageous. Similar results are obtained with actual samples of olive oil wastewaters. This behaviour is explained based on the formation of highly biodegradable benzaldehydes as key ozonisation intermediates, in the early reaction stages.
Amat
Ana M
AM
Departamento de Ingeniería Textil y Papelera, EPSA-UPV, Universidad Politécnica de Valencia, Paseo Viaducto 1, E-03801 Alcoy (Alicante), Spain. aamat@txp.upv.es
Arques
Antonio
A
Beneyto
Higinio
H
García
Ana
A
Miranda
Miguel A
MA
Seguí
Sergio
S
D001547:Benzaldehydes / Q000737:chemistry; D001673:Biodegradation, Environmental; D002934:Cinnamates / Q000737:chemistry; D062385:Hydroxybenzoates / Q000737:chemistry*; D007220:Industrial Waste; D019083:Mediterranean Region; D000069463:Olive Oil; D010083:Oxidants, Photochemical; D010126:Ozone / Q000737:chemistry*; D010938:Plant Oils / Q000493:pharmacokinetics*; D012722:Sewage; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*; D014876:Water Pollution / Q000517:prevention & control*
D001547:Benzaldehydes; D002934:Cinnamates; D062385:Hydroxybenzoates; D007220:Industrial Waste; D000069463:Olive Oil; D010083:Oxidants, Photochemical; D010938:Plant Oils; D012722:Sewage; D014874:Water Pollutants, Chemical; D010126:Ozone; C017616:phenolic acid; C032175:benzaldehyde