POSSIBILITY OF ELIMINATION OF LEAD BY COAGULATION-FLOCULATION WITH ALUMINUM SULPHATE

S. GUERGAZI, D. AMIMEUR, S. ACHOUR

Abstract


The objective of our work is to study the possibility of eliminating lead by coagulation-flocculation at the aluminum sulphate. The tests are carried out according to the protocol of the "Jar-test" in synthetic solution of distilled water. The results showed that the lead removal efficiency is of the order of 15.16%, this rate corresponded to an optimal dose of the coagulant of 40 mg / L. A very good improvement was obtained at pH greater than 6. With the change in the initial lead content (2 to 12 mg / L), the process of coagulation-flocculation has undergone two antagonistic phenomena, removal efficiencies increase with the increase of the initial content of lead until 8mg/L. Then a proportional decrease in yields in excess of this value. To visualize the effectiveness of coagulation - flocculation and adsorption to eliminate lead, we have carried out the coagulation-flocculation coupling and the adsorption by the activated carbon powder as adjuvant, this test showed good elimination of lead as the dose of the adjuvant was increased.


Keywords


lead, coagulation-flocculation, aluminum sulphate, adsorption, active carbon powder

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