Objective
Project's main aim is to develop a process for the treatment of depuration sludges generated by biological systems, by the implantation of a whole of energetic technologies (Thin film drying, hot centrifugalization, residual heat recovering), which permit to improve the yield of conventional treatment systems and to rise up the value of a part the own treatment residues (sludges) by their transformation into a suitable combustible for different sectors (USR incineration plants, cement plants, etc.). This will be achieved by :
- the improvement of current biological treatment system, in order to increase solid concentration in sludges, from the present concentrations of 2% up to values about 3,5%.
- The implantation of an innovative system for hot centrifugalization of sludges, which will allow to achieve values of solid concentration of 36%, meaning an improvement of approximately 4%, compared to a cold centrifugalization process and 11%, compared to the current filtering system.
- The final sludge drying by an novel thin film drying system, with exploitation of residual heat from the thermal plant now existing (air-air exchange with gas from combustion) and adjusting sludges obtained to their use as a combustible.
BASF Espanola SA, has a sewage depuration system comprising a physical-chemical tretament unit, a biological treatment and a sludge filtering unit, this whole of installations permits to achieve a minimum environmental impact, however, it generates a relevant volume of residual sludges with a low content in solid (max. 25%), which must be deposited on drying beds prior to their final deposition on a controlled rubbish chute. Sludges generated at the outlet of the treatment unit have a solid concentration of 2%, which is rised up to 25% by the band-filtering system which provokes a remarkable consumption of washing water which must be treated and which therefore provoke a high energetic consumption further increasing the energetic cost of the treatment of effluents, itself. Finally those sludges with a solid quantity lowers than 35% are deposited in wide drying beds where sun effect and a periodic motion thereof allows them to reach suitable concentrations for being placed on a controlled rubbish chute which procedure provokes relevant costs as well as a remarkable environmental impact.
Nowadays, BASF Espanola SA has been using a drying technique comprising to place the sludges obtained, in drying beds included in the piece of land belonging to the company, and by a discontinuous motion of sludges, to achieve a sufficient sludge drying in order to deposit them on controlled rubbish chutes. This procedures, although optimum in an energetic point of view, as it uses solar energy, provoke a negative local environment impact, since it requires a constant enlargement of drying beds. The company with GEA and DEGREMONT try for carrying out the present demonstration programme, of an energetic-environmental nature, consisting of implanting as a demonstration a unit for the fitting up hot centrifugation and drying of sludges with exploitation of the residual heat derived from the thermal plant, minimization of costs from operation of the whole sewage treatment system.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
- engineering and technologyenvironmental engineeringenergy and fuelsrenewable energysolar energy
- engineering and technologymaterials engineeringcoating and films
- engineering and technologyenvironmental engineeringwaste managementwaste treatment processes
You need to log in or register to use this function
Topic(s)
Call for proposal
Data not availableFunding Scheme
DEM - Demonstration contractsCoordinator
43006 Tarragona
Spain