Characterization and treatment of leachate of the great agadir discharge by infiltration–percolation onto titaniferous sand

Abstract

Abstract Our study consists of treating the liquid discharge of the Great Agadir effluents by the infiltration–percolation technique using titaniferous sand (TFS) coming from the Agadir region. Leachate was removed from the storage pond in TBC (Technical Burying Centre) Tamellast and treated by sand columns with different heights. The physico-chemical analysis of the leachate revealed high levels of biodegradable organic matter (BOD5 varies between 1090 and 2100 mgO2/L) and mineral matter (the average of electrical conductivity reached 96.10 mS/cm). The pH of leachate is slightly alkalin and the value of the BOD5/COD ratio varies between 0.08 and 0.15, which confirms that it is a stabilized intermediate leachate. The treatment by infiltration percolation on TFS of the leachate made it possible to reach interesting reduction rates. In the 150 cm height column, the results show that the turbidity reduction rates, BOD5 and COD reached 89.70%, 73.70% and 43.42%, respectively. Infiltration–percolation technique has shown significant purification performance in the elimination of the pollution load of the treated leachate.