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Valencia, Spain

Collado S.,University of Oviedo | Laca A.,University of Oviedo | Diaz M.,University of Oviedo | Simon P.,Esamur | And 3 more authors.
Tecnologia del Agua | Year: 2012

A correct design of the aeration system is essential for technical and economic feasibility of a sewage treatment plant (WWTP), because it involves a 70% of the energy costs of the plant and determine the final degree of purification attainable. In this paper, the basic principles governing the transfer of oxygen gas-liquid are described, together with the main parameters used to define the efficiency of the system. Source


Collado S.,University of Oviedo | Laca A.,University of Oviedo | Diaz M.,University of Oviedo | Simon P.,Esamur | And 3 more authors.
Tecnologia del Agua | Year: 2011

Extracellular polymeric substances (EPS) have a key role in water treatment processes and processes because they are involved in biosorption, flocculation and adherence processes. In this paper, the main aspects related to the characteristics and chemical composition of the bound and soluble EPS are revised and discussed, together with the role of these substances in the biological wastewater treatment. Source


Collado S.,University of Oviedo | Laca A.,University of Oviedo | Diaz M.,University of Oviedo | Simon P.,Esamur | And 3 more authors.
Tecnologia del Agua | Year: 2011

Extracellular polymeric substances (EPS) have a key role in water treatment processes because they are involved in biosorption, flocculation and adherence processes. In this paper, the main aspects related to the characteristics and chemical composition of the bound and soluble EPS are revised and discussed, together with the effect of operating variables on the production of these substances in the biological wastewater treatment. Source


Santamaria A.,Veolia Water Solutions and technologies AnoxKaldnes | Zalakain G.,Veolia Water Solutions and technologies AnoxKaldnes | Hernandez M.,Cadagua | Fernandez S.,S.A. EMSSA | Gasso J.,S.A. EMSSA
Tecnologia del Agua | Year: 2011

This article describes the reform of Lines 3 and 4 of Gavà- Viladecans WWTP (Barcelona, Spain) to turn an active sludge conventional purification process into an Hybas hybrid process to eliminate biological organic matter and nitrogen by aerobic zones-anoxic-aerobic-anoxic. The aerobic zones includes a plastic landfill. Moreover, the turbine's aeration has been changed to diffusers with turboboosts. The Hybas treatment design is presented too, together the analytical results obtained during lines start-up. Source


A continuous supply of oxygen is essential for the correct operation of wastewater treatment plants. The transfer rate of oxygen to liquid medium depends on the design of the aeration system and, mainly, on environmental and operational conditions. The effect of these conditions on the two characteristic parameters of the oxygen transfer rate, volumetric coefficient of oxygen transfer KLa and oxygen saturation of the medium (C*), is dicussed after to analyze the basic principals and the effects of plant design (Tecnología del Agua, no 336 and 338). Moreover, a global correction factor χ is defined as a descriptor of the effect of real conditions on the transfer of oxygen in wastewater treatment systems. Source

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