الفهرس 
OBJECTIVES OF STUDY
EFFECTS OF MOS COAGULANT DOSE ON THE TREATMENT PROCESSOnly 14 pages are availabe for public view
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Abstract
Moringa Oleifera seeds (MOS) have been used as a natural coagulation agent in surface
water purification. In developing countries, usage of MOS addresses many advantages
namely eco-friendly, biodegradable, and available at low cost ( 200 EGP / Kilo);
affording a powerful alternative to conventional chemical coagulants. This study reveals
the effect of using MOS as a coagulant with the aid of synthetic sponge for treating
surface water at different operational conditions. Sponge plays an important role in
terms of increasing the opportunity of prolonging the reaction time between pollutants
causing turbidity and MOS thanks to its huge voids volume. As well, it represents a
long-lasting filtration media; helping in retaining the resulted flocs inside and eventually
decreasing the turbidity and liberated UV254 substances in the solution. The proposed
purification approach showed a great influence on the purification efficiency without
any observed clogging of sponge pores or bad smell. Supplementation of sponge
improved the removal efficiency of turbidity and UV254 substances from 96% and 72%
to 99% and 93%, respectively with reduced MOS coagulant dose from 500 to 150 mg/L.
Response surface methodology (RSM) has been employed to investigate the interaction
between critical operational conditions and determine their optimal values for obtaining
a residual turbidity value not exceeds 1.0 NTU. They were found to be as follows: MOS
dose of 250 mg/L, pH value of 6.15 (≈ 6), and 12.17 (≈ 13) minutes of reaction. Taken
overall, MOS demonstrate natural cost-effective coagulant for turbidity removal from
surface water. Most importantly, sponge usage proved enhancement in MOS ability as
well as an expected reduction in overall expenses needed for coagulation process.
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