Ozonation strategies to reduce sludge production of a seafood industry WWTP

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

doi:10.1016/j.biortech.2008.07.056

Ozonation strategies to reduce sludge production of a seafood industry WWTP

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

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

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 COD_Tremoved 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 language	English
Pages (from-to)	1069-1073
Number of pages	5
Journal	Bioresource Technology
Volume	100
Issue number	3
DOIs	https://doi.org/10.1016/j.biortech.2008.07.056
State	Published - Feb 2009
Externally published	Yes

Keywords

Activated sludge system
Excess-sludge
Ozone
Wastewater

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10.1016/j.biortech.2008.07.056

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title = "Ozonation strategies to reduce sludge production of a seafood industry WWTP",

abstract = "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.",

keywords = "Activated sludge system, Excess-sludge, Ozone, Wastewater",

author = "Campos, {J. L.} and L. Otero and A. Franco and A. Mosquera-Corral and E. Roca",

note = "Funding Information: This work was funded by the Xunta de Galicia (PGIDIT05TAM028E). Authors want to thank Mar Orge, M{\'o}nica Dosil and Miriam Vieites for their support in the analytical techniques. ",

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AU - Campos, J. L.

AU - Otero, L.

AU - Franco, A.

AU - Mosquera-Corral, A.

AU - Roca, E.

N1 - Funding Information: This work was funded by the Xunta de Galicia (PGIDIT05TAM028E). Authors want to thank Mar Orge, Mónica Dosil and Miriam Vieites for their support in the analytical techniques.

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N2 - 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.

AB - 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.

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Ozonation strategies to reduce sludge production of a seafood industry WWTP

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Keywords

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