Drying sludge with solar energy prototype developed in Spanish Living Lab

This week, in the TWIST Spanhish Living Lab, OWL2 , was completed the construction of a prototype for drying sewage sludge and leachate through the use of concentration solar technologies. The prototype was developed within the framework of the SECASOL Project, financed by the European POCTEP program (2014-2020).

This is the first prototype that exists in Spain and at the end of the project it will become a research infrastructure for other types of waste from, among others, the food industry.

The main characteristics of the prototype are:

  • Type of dryer
    • Sludge: band direct, two zones with different temperatures
    • Leachate: type evaporative
  • Solar technology: Fresnel linear concentrator, opening area 70 m2
  • Maximum thermal power: 5 kWt
  • No ancillary energy support
  • Thermal transference fluid: water
  • Working temperature range: 115 ºC – 107 ºC
  • Maximum air temperature of air entering the dryer: 95ºC

WWTP sludge

  • Product characteristics: dehydrated WWTP sludge
  • % dry matter of the wet product: >= 20%
  • % dry matter of the dried product: > 90%
  • Maximum treatment capacity: 180 kg/day

Landfill leachate

  • Product characteristics: landfill leachate
  • % dry matter of the wet product: 5%
  • % dry matter of the dried product: 15%
  • Maximum treatment capacity: 160 L/day

More about SECASOL project

The SECASOL project, with a total budget of € 789,349.05, aims to increase efficiency levels in the use of natural resources to contribute to the development of the green economy, and promote Innovative technologies in the drying process of sludge from municipal wastewater treatment plants and leachates, using concentrated thermal solar technologies.

The project is led by the Diputación de Huelva (Spain) and has as partners CENTA Foundation (Spain), the Agência Regional de Energia e Ambiente do Algarve (Portugal), Águas do Algarve (Portugal), Cespa Gestión de Residuos S.A. (Spain), Gestão Ambiental e de Resíduos (Évora, Portugal) and the Laboratório Nacional de Energia e Geologia, I.P. (Portugal)

More information at: http://www.diphuelva.es/secasol/