Technical Visits


Place Chiclana de la Frontera
Address Cádiz (Spain)
Location google maps


One of the challenges in the water sector is to avoid the production of residuals at the different stages in the water cycle, or at least take maximum advantage of them. Our aim is to achieve the highest possible degree of sustainability and efficiency. On the contrary, with current technology, such as the activated sludge process that is already 100 years old, wastewater treatment involves high energy needs and sludge production.

In fact, the resources contained in wastewater, energy and nutrients, are only partially recovered, and mostly at the end of the process - making the economical return difficult. The All-gas project, co-financed by the European Community FP 7 program, is a change of paradigm, systematically transforming the resources into value, such as biofuel, lipids or fertilizer.

Without high electricity input such as aeration, a positive energy balance is created since only a small part of the inherent energy in wastewater is used for internal process needs (mixing and harvesting: about 0,1 kwh/m3), and the whole biomass is transformed to biomethane with the goal of wastewater treatment becoming a net energy producer.

As a result, all of the biomass produced (more than 20 g/m2/d) is available for beneficial use, either vehicle fuel (biomethane), lipid products or biofertilizer. Instead of a cost to the community, wastewater becomes a resource! Only about 1 ha is needed to treat 1000 m3/d up to reuse quality with nutrient removal, simultaneously producing biofuel for about 10 cars... this is twice the productivity of sugarcane ethanol or palm oil diesel.

Since 2011, a detailed material and LCA balance (by Fraunhofer-Umsicht) was evaluated in the initial 2 year pilot phase (6 raceways of 35 m2) and confirmed during the subsequent 2 year prototype operation (2 raceways of 500 m2). In a final phase, currently under construction, the All-gas project demonstrates this sustainable large-scale production of biofuels based on the low-cost cultivation of microalgae, initially on a first phase of 3,5 ha of cultivation area – later expandable to up to 30 hectares.

Thanks to the contributions of various partners, such as Southampton University (UK), the complete process chain - from cultivation ponds, biomass separation, extraction of oils (BDI-Bioenergy, Austria) and other chemicals to the downstream production of biofuels (Hygear, NL) and their use in vehicle fleets - will be operated on industrial scale in Chiclana.  The demo will be accompanied by the operation of 4 biomethane vehicles supplied by VW to prove the reliable fuel production during at least 30 000 km.

Website All-gas project


Place Carrión de los Céspedes 
Address Seville  (Spain)
Location google maps


The project BioSolWaRe-LIFE13 ENV/FR/000711 is a Demonstration wastewater treatment system dedicated to wastewater reuse and recycling, funded through the Programme LIFE+ Environment Policy & Governance.

Its main goal is the validation of an innovative, efficient and competitive system for wastewater treatment based on an ecological process called “Bio-Solar Purification” (BSP). This system has been especially designed for small communities and isolated dwellings. It combines both biological processes (algae cultivation) and the solar technology to reuse up to 80% of the treated water, facilitating the recovery and later beneficial use of greenhouse gases and other organic wastes produced during the treatment.

The project will include the construction, commissioning and operation of two prototypes with a production capacity of 13 m3/day and 50 m3/day, respectively, of reclaimed and disinfected water that will improve both the energy and carbon balances in comparison with the traditional wastewater treatment and reuse technologies.

Website CENTA and LIFE Biosol project


 La Ranilla

Place Alcalá de Guadaíra
Address Seville  (Spain)
Location google maps


La Ranilla wastewater treatment plant began operating in 2008. It treats urban wastewater of an equivalent population of 550.000 i.e. The average design flow is 90.000 m3/day, and treated water is discharged into the Ranilla stream, within the Guadalquivir area.
The WWTP includes a preliminary treatment, followed by a primary settling process, an activated sludge biological treatment, and a tertiary process to polish the outlet water.
All the processes in the facility are covered to avoid bad odors. It also has a chemical system to remove the odorous compounds.

Further information here