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Barcelona, Spain

Bouchy L.,CetAqua | De Arespacochaga N.,CetAqua | Cortina J.L.,CetAqua | Larrotcha E.,Agbar | And 2 more authors.
Biotechniques for Air Pollution Control - Proceedings of the 3rd International Congress on Biotechniques for Air Pollution Control | Year: 2010

Within the framework of sustainable development, today burning biogas via a flare cannot be considered a long-term solution. Moreover, the ever-increasing energy costs constitute another important driver for wastewater treatment activities. Furthermore, although cogeneration has been widely developed, other emerging more promising biogas end-use routes must now also be considered. Within this context, the goal of this study is to assess opportunities for different biogas end-uses, in particular: fuel cells, conventional cogeneration and car motors. The focus of this poster is the biogas treatment, and the objective is to establish a "mapping" of adequate technologies available and their relevance depending on the biogas end-use, based on technical, economic and environmental criteria. This study was carried out by literature research, and carrying out audits of industrial or pilot plants. Source


Marine S.,Rovira i Virgili University | Pedrouzo M.,Rovira i Virgili University | Maria Marce R.,Rovira i Virgili University | Fonseca I.,Agbar | Borrull F.,Rovira i Virgili University
Talanta | Year: 2012

Different sampling methods involving the collection of biogas by Tedlar bags or adsorption tubes, and different GC-MS injection systems, loop injection or cold trap injection (with bags or by tube desorption), were compared to establish the best method to determine the minority compounds in biogas from sewage treatment plants (STPs). A study of parameters is included, such as the stability of compounds in Tedlar bags or cartridges and the adsorption effect of some less volatile compounds in the thermal desorption system (TD). The optimized methods allowed to determine most compounds at low mg m-3 levels. Among them, maximum values of D5 (4.84 mg m-3), decane (95-118 mg m-3) and H2S (2223 mg m-3) were found in biogas samples. © 2012 Elsevier B.V. Source


Bouchy L.,Water Technology Center | Perez A.,Water Technology Center | Camacho P.,Suez Environnement Cirsee | Rubio P.,Agbar | And 5 more authors.
Water Science and Technology | Year: 2012

Many drivers tend to foster the development of renewable energy production in wastewater treatment plants as many expectations rely upon energy recovery from sewage sludge, for example through biogas use. This paper is focused on the assessment of grease waste (GW) as an adequate substrate for co-digestion with municipal sludge, as it has a methane potential of 479-710 LCH 4/kg VS, as well as the evaluation of disintegration technologies as a method to optimize the co-digestion process. With this objective three different pre-treatments have been selected for evaluation: thermal hydrolysis, ultrasound and enzymatic treatment. Results have shown that co-digestion processes without pre-treatment had a maximum increment of 128% of the volumetric methane productivity when GW addition was 23% inlet (at 20 days of HRT and with an OLR of 3.0 kg COD/m 3d), compared with conventional digestion of sewage sludge alone. Concerning the application of the selected disintegration technologies, all pre-treatments showed improvements in terms of methane yield (51.8, 89.5 and 57.6% more for thermal hydrolysis, ultrasound and enzymatic treatment, respectively, compared with non-pretreated wastes), thermal hydrolysis of GW and secondary sludge being the best configuration as it improved the solubilization of the organic matter and the hydrodynamic characteristics of digestates. © IWA Publishing 2012. Source


Perez R.,Polytechnic University of Catalonia | Nejjari F.,Polytechnic University of Catalonia | Puig V.,Polytechnic University of Catalonia | Quevedo J.,Polytechnic University of Catalonia | And 3 more authors.
Urban Water Management: Challenges and Oppurtunities - 11th International Conference on Computing and Control for the Water Industry, CCWI 2011 | Year: 2011

Using the simulation models a methodology was developed for leakage detection and localisation in a water distribution network [4]. Such methodology is based on fault detection and isolation techniques. Sensitivity matrix of pressures to leaks [8] is generated using simulation models [1]. Such models are available in water companies. The methodology showed promising results but two main issues appeared. Calibration in models and precision in sensors was required. Investment in sensors could be afforded [6] as long as models were well calibrated enough. The main uncertainty in models lies on demands. This paper presents a study of the effect of an improvement in demand calibration on isolability of leaks. The aim is to quantify the return of an effort in calibrating in terms of leak detection one of the main issues in water industry [2]. Source


Jelic A.,CSIC - Institute of Environmental Assessment And Water Research | Gros M.,Catalan Institute for Water Research | Ginebreda A.,CSIC - Institute of Environmental Assessment And Water Research | Cespedes-Sanchez R.,Agbar | And 6 more authors.
Water Research | Year: 2011

During 8 sampling campaigns carried out over a period of two years, 72 samples, including influent and effluent wastewater, and sludge samples from three conventional wastewater treatment plants (WWTPs), were analyzed to assess the occurrence and fate of 43 pharmaceutical compounds. The selected pharmaceuticals belong to different therapeutic classes, i.e. non-steroidal anti-inflammatory drugs, lipid modifying agents (fibrates and statins), psychiatric drugs (benzodiazepine derivative drugs and antiepileptics), histamine H2-receptor antagonists, antibacterials for systemic use, beta blocking agents, beta-agonists, diuretics, angiotensin converting enzyme (ACE) inhibitors and anti-diabetics. The obtained results showed the presence of 32 target compounds in wastewater influent and 29 in effluent, in concentrations ranging from low ng/L to a few μg/L (e.g. NSAIDs). The analysis of sludge samples showed that 21 pharmaceuticals accumulated in sewage sludge from all three WWTPs in concentrations up to 100 ng/g. This indicates that even good removal rates obtained in aqueous phase (i.e. comparison of influent and effluent wastewater concentrations) do not imply degradation to the same extent. For this reason, the overall removal was estimated as a sum of all the losses of a parent compound produces by different mechanisms of chemical and physical transformation, biodegradation and sorption to solid matter. The target compounds showed very different removal rates and no logical pattern in behaviour even if they belong to the same therapeutic groups. What is clear is that the elimination of most of the substances is incomplete and improvements of the wastewater treatment and subsequent treatments of the produced sludge are required to prevent the introduction of these micro-pollutants in the environment. © 2010 Elsevier Ltd. Source

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