EFFICACY OF ADANSONIA DIGITATA L. SEEDS AS A NATURAL SOURCE FOR WATER PURIFICATION
EFFICACY OF ADANSONIA DIGITATA L. SEEDS AS A NATURAL SOURCE FOR WATER PURIFICATION
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Date
2015-06
Authors
EDOGBANYA, Ocholi Paul
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Abstract
Scientific studies aimed at evaluating theefficacy of Adansonia digitata L. seeds as a natural source for water purification, was determined in some laboratories in Ahmadu Bello University, Zaria, from 23rd july, 2014 to 7th November, 2015. Dried fruits of A. digitata were collected from the Department of Biological Sciences, Ahmadu Bello University, Zaria.The seeds were excised, washed with sterile distilled water, sundried, powdered, defatted using n-hexane and stored in the refrigerator for further studies.Model polluted water was prepared in the laboratory while surface water was obtained from the Kubanni Reservoir, Ahmadu Bello University, Zaria. Experiments were carried out in triplicates with powdered defatted seeds at doses of 0mg/l (control), 50mg/l, 100mg/l, 150mg/l and 200mg/l as biocoagulant, disinfectant and biosorbent. Jar test experiments were carried out for the biocoagulation studies; disinfection experiments for disinfection studies; and batch experiments for the adsorption studies. The experimental design was Cross Randomized Design (CRD) and One way Analysis of Variance (ANOVA) was used to determine significant difference among means of the various parameters measured. The New Duncan Multiple Range Test (NDMRT) was used in separating means with different significant values. Regression analysis was used for the kinetic studies. The confidence level was taken at 95% ( p<0.05). Results revealed that an optimum dose of 150mg/l was able to reduce turbidity of model water significantly (p < 0.05) from 20.06NTU to 6.57NTU, but there was no significant reduction (p >0.05) in the turbidity of surface water. As a disinfectant, a dose of 200 mg/l was able to significantly reduce (p < 0.05) Total Coliform Count of the model water and surface water from 1.65×104 cfu/ml and 4.27×102 cfu/ml to 5.00×102 cfu/ml and 6.67×101 cfu/ml respectively. As biosorbent a dose of 200mg/l was able to reduce the initial concentration of Cd2+ and Pb2+ by 72.98% and 97.49% respectively in model water; and by 93.52% and 100% respectively in surface water. The adsorption of Cd2+ and Pb2+ onto the biosorbent followed the 2nd order Kinetic model with R2 value of 0.993 and 0.998 respectively. The 2nd order constants (k2) obtained for Cd2+ and Pb2+ were 2.29 × 10-5 and 5 × 10-6 respectively.Adansonia digitata seeds possess biocoagulant, disinfectant and biosorptive potentials, but it is not significantly effective for highly turbid and contaminated water. The seeds may possibly be used to complement other conventional chemicals in the purification of water.
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A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE M.Sc. BIOLOGY
DEPARTMENT OF BIOLOGICAL SCIENCES
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
Keywords
EFFICACY,, ADANSONIA,, DIGITATA L.,, SEEDS,, NATURAL,, SOURCE,, WATER,, PURIFICATION,