Proceedings

SLUDGE MANAGEMENT AND THE KYOTO PROTOCOL

Iván Arauzo and Diana Permuy
STC

(free)

Improved wastewater treatment processes and compliance with European water quality directives have led to a spectacular increase in the amount of sludge generated by treatment processes. Suitable management of sludge is at present a major handicap. The emission reduction requirements established by the KYOTO Protocol pose an enormous challenge for the industrial world, and most particularly for the main industrial consumers of fossil fuels, such as, for example, the cement industry.

STC has developed a project for thermal sludge drying using residual gases from cement production processes, with a system that generates a 90/75ºC closed air circuit resulting from the exhaust gas exchange in the cement production process. Consequently, as all the energy used for the drying process comes from the cement production process, there is no need to consume primary energy, and this ultimately optimises the overall process. The sludge thermal drying process allows the overall efficiency of the production process to be improved by achieving more useful energy for the same primary energy consumption (which, moreover, implies a CO2 quota). Moreover, the combustion of sewage sludge in the production process provides an additional CO2 quota. The following is a proposal for a combination of both processes that results in environmental and financial synergies

KEY WORDS Alternative fuels, biosolids, cement industry, incineration, KYOTO, sewage sludge

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