Ozonation strategies to reduce sludge production of a seafood industry WWTP

J. L. Campos, L. Otero, A. Franco, A. Mosquera-Corral, E. Roca

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87 Scopus citations


In this work, several alternatives related to the application of ozone in different streams of a seafood industry WWTP were evaluated to minimize the production of waste sludge. The WWTP was composed of two coagulation-flocculation units and a biological unit and generated around of 6550 kg/d of sludge. Ozone was applied to sludge coming from flotation units (110 g TSS/L) at doses up to 0.03 g O3/g TSS during batch tests, no solids solubilization being observed. Ozone doses ranging from 0.007 to 0.02 g O3/g TSS were also applied to the raw wastewater in a bubble column reaching a 6.8% of TSS removal for the highest ozone dose. Finally, the effect of the pre-ozonation (0.05 g O3/g TSS) of wastewater coming from the first flotation unit was tested in two activated sludge systems during 70 days. Ozonation caused a reduction of the observed yield coefficient of biomass from 0.14 to 0.07 g TSS/g CODTremoved and a slight improvement of COD removal efficiencies. On the basis of the capacity for ozone production available in the industry, a maximum reduction of sludge generated by the WWTP of 7.5% could be expected.

Original languageEnglish
Pages (from-to)1069-1073
Number of pages5
JournalBioresource Technology
Issue number3
StatePublished - Feb 2009
Externally publishedYes


  • Activated sludge system
  • Excess-sludge
  • Ozone
  • Wastewater


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