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Assiut University (2019)

EXPERIMENTAL STUDY ON THE USE OF MORINGAOLEIFERA AS A NATURAL COAGULANT IN DRINKING WATER TREATMENT

Esraa Mouhamed Abd ؛ El-Hamied

Titre : EXPERIMENTAL STUDY ON THE USE OF MORINGA OLEIFERA AS A NATURAL COAGULANT IN DRINKING WATER TREATMENT/

Auteur : Esraa Mouhamed Abd ؛ El-Hamied

Etablissement de soutenance : Assiut University

Grade : Master of Science (MSc) in Civil Engineering 2019

Résumé
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.

Présentation étendue (EULC)

Page publiée le 25 décembre 2020