Murcia, Spain
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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.


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.


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.


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.


Simon P.,Esamur | Mifsut C.L.,Esamur | Romero L.V.,Toscano Medioambiente S.L | Sanchez P.P.,Acciona | Perez A.R.,Acciona
Tecnologia del Agua | Year: 2011

Wastewater treatment plants (WWTP) are dedicated essentially to reduce the organic, nitrogen and phosphorous load of given waste water. Nevertheless, as a part of the performance of the plant, attention has to be given to the sludge treatment line both technically and economically. An appropriate dehydration process is essential for the minimization of the WWTP impact, either for the disposal of the sludge or the possible leachate generation. In the recent years there have not been significant improvements in the mechanical dehydration equipment, being necessary alternatives like ultrasound technology. This work studies, in a laboratory and pilot plant, the improvement of a dehydrated sludge with an ultrasound technology pretreatment. Using ultrasound, the sludge dryness is better and the management costs are reduced 8%.


Bernabeu A.,Universidad Politécnica de Ingeniería | Vercher R.F.,Universidad Politécnica de Ingeniería | Santos-Juanes L.,Universidad Politécnica de Ingeniería | Simon P.J.,Esamur | And 7 more authors.
Catalysis Today | Year: 2011

Water taken from the outlet of a wastewater treatment plant from the South East of Spain has been treated by means of TiO2-based solar photocatalysis. Preliminary analysis showed the presence of significant amounts of nine emerging pollutants (order of magnitude of ng/l): trimethoprim, ofloxacin, enrofloxacin, clarithromycin, acetaminophen, diclofenac, caffeine, thiabendazole and carbamazepine; and trace amounts of another two were detected, namely acetamiprid and erythromycin. Irradiation of the effluent in the presence of TiO2 resulted in a significant removal of all the emerging pollutants, as most of them were detected only at trace amounts after the treatment. In addition to this, percentages of faecal bacteria elimination were close to 100%. Finally, experiments carried out using caffeine as model compound showed that a mild photo-Fenton process might be employed at neutral media in the presence of humic acids, although the performance was worse than photo-Fenton at acidic pH or TiO2. © 2010 Elsevier B.V. All rights reserved.


This work determines the joint codigestion of mixed sludges of Alcantarilla WWTP (Murcia, Spain) with the following wastes: molass (sugar cane residue); remains of fruits and vegetables, pork blood and lacteal serum; and checks the technical viability and the values limit to obtain this digestion: molass and pork blood(< 6%), fruits and vegetables (< 60%) and lacteal serum (< 12%). The codigestion allows to increase 200% the production of methane, so to triple the electric power production in a regeneration plant. As negative effects, an increase of DQO of digested sludge and sludge quantity of treating is observed with some of these cosubstrate.


Trapote A.,University of Alicante | Albaladejo A.,University of Alicante | Simon P.,ESAMUR
Civil Engineering and Environmental Systems | Year: 2014

Of all the costs associated with the operation and maintenance of wastewater treatment plants (WWTPs), those associated with energy use tend to be the most significant. From this point of view, it is hence logical that energy efficiency and saving strategies should be one of the current focuses of debate amongst those involved with the management of WWTPs. The present study's objective is to determine the correlation between size and energy consumption for a WWTP. To this end, 90 WWTPs currently in service were analysed and their energetic impact quantified in terms of kWh/m3 of water treated. The results obtained demonstrate that energy consumption ratio increases as the size of WWTPs decreases, either in terms of treatment volume or population equivalent served. © 2013, © 2013 Taylor & Francis.

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