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Accueil du site → Doctorat → Soudan → Application of Crude and Extract of Maerua Pseudopetalosa, Boscia senegalensis and Ocimum basilicum L. as Natural Coagulants for Clarification of Turbid Water : A case Study of Almanagil Canals, Gezira State, Sudan

University of Gezira (2015)

Application of Crude and Extract of Maerua Pseudopetalosa, Boscia senegalensis and Ocimum basilicum L. as Natural Coagulants for Clarification of Turbid Water : A case Study of Almanagil Canals, Gezira State, Sudan

SALIH, AMEL MOHAMMED ABD ELGAFAR

Titre : Application of Crude and Extract of Maerua Pseudopetalosa, Boscia senegalensis and Ocimum basilicum L. as Natural Coagulants for Clarification of Turbid Water : A case Study of Almanagil Canals, Gezira State, Sudan

Auteur : SALIH, AMEL MOHAMMED ABD ELGAFAR

Université de soutenance : University of Gezira

Grade : Doctor of Philosophy in Chemistry (2015)

Résumé
Water is used for several purposes by humans but the level of purity of the water being consumed is very crucial since it has a direct effect on health. Safe drinking water should generally be free from heavy metals, turbidity, organic compounds and pathogens. Turbidity removal is strongly dependent on proper coagulant dosage, effect of pH ,effect of time and jar test . The need to treat water with natural coagulants became a common practice because the realization that the agencies saddled with responsibility of providing potable water to the public cannot cope with the present demand . The present study was undertaken to investigate the efficiency of three plants namely ; Maerua Pseudopetalosa (Kordala ) , Boscia senegalensis (Mukheit ) , and Ocimum basilicum L. (Rehan/ Sweet Basil ) and their aqueous extract as natural coagulants for water samples with different turbidities from five villages in Almanagil Zone , Gezira State, Sudan . Turbidity , pH , and electric conductivity ( EC ) were measured . Jar test experiments were carried out for (360 NTU, 43.7 NTU, 394NTU, 276NTU, and 164 NTU) of turbiditis of sampl1, sample2, ample3, sample4, and sample5 respectively, with the flocculent dosages of 0g/l 0.5g/l ,1.0g/l, 1.5g/l , and 2.0g/l for Maerua Pseudopetalosa , Boscia senegalensis , and Ocimum basilicum L., and of 10ppm, 20ppm, 30ppm, and 40ppm of their aqueous extracts. The results have been compared with the results of PAC. Maerua Pseudopetalosa showed activity in turbidity removal at 24 hours after treatment with 40 ppm aqueous extract for all samples achieved 99.03% , 95.2% , 99.5% , 99.4% , and 98.9% for sample1 , sample2 , sample3 , sample4 , and sample5 respectively , with no change on pH of sample 2, sample 3 , and sample5, for sample1 the pH change from 7.2 to 7.6 ,and from 7.5 to 8.1 for sample4 , all values of pH within higher limit of WHO and SSMO standard ( 8.5 ). Boscia senegalensis and Ocimum basilicum L. showed efficiency in turbidity removal for all samples ,but the values of turbidies were higher than that recommended by SSMO ( 5NTU ) and WHO ( 0NTU ), except for sample5( 164- 3.8 NTU) with turbidity removal efficiency percent ( 97.7 % ) and increase in pH ( 7.7 – 8.4 )and in EC (199 – 259 μs/cm ) , these results were observed after 24 hours after treatment with 40 ppm of Boscia senegalensis aqueous extract. For sample2( 43.7- 3.4 NTU) with turbidity removal efficiency percent ( 92.2 % ) and increase in pH ( 7.6 – 8.2 )and in EC ( 191 – 257 μs/cm ) observed after 24 hours after treatment with 40 ppm aqueous extract of Ocimum basilicum L. The results showed that natural coagulants can effectively be used in water treatment process as a primary aid. they lower the dose of traditional chemicals and make the treatment process cost effective and environment friendly . This study recommended transferring the results from laboratory to the water treatment works( treatment plants and filtration units ). Rehabilitation of hafirs and sand filter units in Almanagil villages is vital for water treatment.

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Page publiée le 29 novembre 2018