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Abstract
Anaerobic effluents from a fixed bed reactor (FBR) treating sewage water from tourist areas were treated by two high rate filters at laboratory scale one packed with sand and the other with natural zeolite with the aim of obtaining final effluents with quality for irrigation of land or disposal in tourist zones. During the experiments analysis of turbidity, COD, BOD, total solids (TS),total volatile fatty acids (TVFA), pH, alkalinity, ammonia nitrogen and total coliforms were carried out. Besides of these, the changes of pressure losses were determined. The filtering media used were: sand and natural zeolite with particle sizes in the range of 1–3 mm and 0.6–2.5 mm and 1–3 mm, 0.6–2.5 mm for both media and particle sizes of 0.35 ‐ 1 mm also for the zeolite. It was found that turbidity removal was similar for sand and zeolite although the filter packed with zeolite media had lower pressure losses and better hydraulic behaviour. The evaluation of different particle size demonstrated that particle size in the range of 1 ‐3 mm for both media was more effective than the rest of particle range studied in the removal of pollutant particles.
Notes
Corresponding author: R. Borja.