FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Alum, coagulation, egg-shell, flocculation, methylene blue, wastewater
The evaluation of powdered egg shell (ES) as coagulant aid to alum [Al2(SO4)3], a primary coagulant in the treatment of basic dye, Methylene blue (MB) contaminated aqueous system was investigated. The ability of alum and the Egg Shell (ES), separately, to decolourise the methylene blue contaminated water was investigated by method of continuous variation of the alum and ES dosages. The ability of the ES to serve as a coagulant aid was also assessed. The coagulation and flocculation process variables (pH, dosage effect, initial dye concentration) were also optimized by method of continuous variation. The results obtained when alum alone was used as primary coagulant showed that alum alone has precipitating effect on the removal of MB from aqueous solution, with over 86% of the MB removed. On the other hand, when ES alone was used, the precipitating effect was very low. However, the combination of alum, as primary coagulant, and ES as coagulant aid enhanced the amount of MB removed with over 98% removal achieved. The effect of pH on the removal of MB was not noticeable but the percentage of MB removed was appreciable at all the pH studied. This result indicates that egg shell could be successfully used as a coagulant aid to alum in the treatment of dye contaminated wastewater.
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