ch 3_

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

Chapter 3: Water Quality and Water Resources - Water is essential to human life, and it is needed to be plentiful for human to survive. - Industrial wastes and climate change pose both new and old threats to our water supply - The next info is going to be about how to maintain quality and water quantity... Introduction - We endure the potential diseases in contaminated water since the 19 century o Some diseases include diarrheal diseases which kill 2 million annually - Even though we have improved our ways of water sanitation, it still leaves 20% without improved drinking supplies - Evidence have shown that changing the means of human waste disposal is much better than purifying your water supplies Sources of Water - %K0708,O848:71,.0Z,907,39K0708J74:3Z,907 o Surface water is Streams, lakes, and rivers 2489.439,2L3,90-0.,:80L98439K08:71,.0 -0L3J5743094.K02L.,O8 and microbial pathogens from waste runoff from nearby land o Ground water is... Artesian or other types of wells Not as contaminated because its beneath the soil which act as filters for the water... However, ground water can be contaminated if waste on top seeps through...such as a landfill. Once ground water is contaminated, the water stays contaminated for a long time Uses of Water - :,907L83943O94-0.438:20 ,98,.9:,OO9K0O0,89Z04ZL9KZ,907 - 70% of water is used for agriculture o 88% in Africa (highest), and 31% in Europe (lowest) o US and Europe use 55% of their water for industries o In industries, water is used for cooling or flushing equipment, which then leads to rivers, streams, etc. (contaminated water) o Home wise... Most is used for toilet flushing, then clothes washers, and then faucets Sources of Contamination - Chemicals can enter into water through a number of ways... o Fertilizers and pesticides are washed away from land and brought to streams, lakes, and rivers (surface water) o This can happen to animal waste in the similar fashion o Heavy landfills can have their chemicals seep through into ground water o ;03,79K8.7:89.439,2L3,9089K0Z,907ZL9K,7803L.,37,43ZK03Z,907L8 in contact with it o Also, treating water with chemicals and disinfectants have a chance for it to be still present in our drinking water - Sources of contaminants that discharge into receiving waters from a pipe or other
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