By T.H.Y. Tebbutt (Auth.)
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Extra info for Principles of Water Quality Control
In the developed world water-related diseases are rare, due essentially to the presence of efficient water supply and wastewater disposal systems. However, in the developing world perhaps as many as 2000 million people are without safe water supply and adequate sanitation. As a result, the toll of water-related disease in these areas is frightening in its extent. A recent WHO survey has highlighted the following facts: Each day some 30 000 people die from water-related diseases. In developing countries 80 percent of all illness is water-related.
CHAPTER 4 Aquatic Microbiology and Ecology A FEATURE of most natural waters is that they contain a wide variety of micro-organisms forming a balanced ecological system. The types and numbers of the various groups of micro-organisms present are related to water quality and other environmental factors. In the treatment of organic wastewaters, micro-organisms play an important role and most of the species found in water and wastewater are harmless to man. However, a number of micro-organisms are responsible for a variety of diseases and their presence in water poses a health problem.
AQUATIC MICROBIOLOGY AND ECOLOGY 35 aerobic system. In the absence of organic input, algal growth depends upon the mineral content of the water so that in a hard water algae obtain C 0 2 from bicarbonates, reducing the hardness and usually increasing the pH. Algae are important in water because of their effect on DO levels and because some species can produce severe taste and odour problems. In a few instances, cattle have died after drinking water containing algal products. Since some species of algae can utilize atmospheric nitrogen the critical element controlling the growth of algae is usually phosphorus.
Principles of Water Quality Control by T.H.Y. Tebbutt (Auth.)