USE OF SEEDS OF Moringa oleifera AND WOOD OF Phyllanthus
TO CLARIFY TURBID WATERS AND WASTEWATERS
M.A.A.W. Moramudali, P. Fernando, P.A.J. Yapa
Department of Botany,
University of Sri Jayewardenepura
Ability of mature and immature seeds of Moringa oleifera and wood
of Phyllanthus emblica to purify turbid waters and wastewaters
Mature seed extracts of Moringa were comparatively more effective than
immature seed extracts in purifying turbid waters. Mature seed powder
at 50 mg/20 ml reduced the turbidity (NTU) by 95% within 2 hours. It was
the aqueous extract of Moringa seeds that was effective in clarifying
turbid waters, not the insoluble fraction. These observations are complementary
to results of some previous workers. A positive relationship between protein
content and purifying ability of seed extract was also observed.
It was also found that extract of mature Moringa seeds have an ability
to clarify textile dye solutions. All four solutions of textile dye namely
Terasil Blue 3RL-02, Terasil Navy GRL-C, Terasil-Red R and Terasil Yellow
4G were clarified by Moringa seed extracts.
Studies on pH and the conductivity of different types of water samples
showed that pH is slightly reduced and conductivity is rapidly increased
when the sample were treated with Moringa seeds. In addition, the conductivity
was found to fluctuate with time and temperature of treated samples.
The effectiveness of the mature seeds of Moringa against the bacterial
growth of polluted waters was also studied. It was found that there is
a significant difference between the bacterial growth of treated and untreated
samples. It was the quantity of seeds used that mostly affected the bacterial
growth, than the time exposed to the seeds.
Antimicrobial activity of crude aqueous extract of Moringa seeds were
studied against E. coli and Proteus sp., which are indicative of faecally
polluted water and disease causal organisms. Clear inhibition zones were
observed for both organisms.
The purifying ability of dried fruit, dried and non-dried branches of
P. emblica was also investigated. The dried branches of P. emblica
were found to be more effective in purifying turbid water whereas the
non-dried branches showed little effect. Dried fruit did not show any
The purifying ability of seeds of M. oleifera and various parts
of P. emblica plant was also investigated against paper factory
effluent but no significant effect was observed.
Department of Forestry and Environmental Science,
of Sri Jayewardenepura,Sri Lanka. 1995-2000. All rights reserved.