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THE
USE OF ALGAE FOR WATER PURIFICATION
CHAPTER
ONE
INTRODUCTION
1.1
Background of the study
Pollution of
surface water has become one of the most important environmental problems. Two
types of large and long-lasting pollution threats can be recognized at the
global level: on the one hand, organic pollution leading to high organic
content in aquatic ecosystems and, in the long term, to eutrophication. It is a
well-known fact that polluted water can reduce water quality thus restricting
use of water bodies for many purposes.
Organic
pollution occurs when large quantities of organic compounds from many sources
are released into the receiving running waters, lakes and also seas. Organic
pollutants originate from domestic sewage (raw or treated), or urban run off,
industrial effluents and farm water. Organic pollution could negatively affect
the water quality in many ways. During the decomposition process of organic
water dissolved oxygen in the water may be used up greater rate than it can be
replenished thus, giving rise to oxygen depletion which causes severe
consequences on the aquatic biota. Organic effluents also frequenlty contain
large quantities of suspended solid which reduce the light available to
photosynthetic organisms mainly algae. In addition organic wastes from people
and animals may also rich in disease causing (pathogenic) organisms
1.2
Statement of the problem
The presence of
some algae are well correlated with particular type of pollution particularly
to organic pollution
Algae of many
kinds are really good indicators of water quality and many lakes are
characterized based on their dominant phytoplankton groups. Many desmids are
known to be present in oligotrophic waters whilst a few species frequently
occurs in eutrophic bodies of water [7]. Similarly, many blue-green algae
occurs in nutrient-poor waters, while some grow well in organically polluted
waters [8]. The ecosystem approach to water quality assessment also include
diatom species and accociations used as indicators of organic pollution.
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