Ch. 16 Water Pollution
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Transcript of Ch. 16 Water Pollution
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Environmental Chemistry, vanLoon & Duffy, Chapter 16
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Guidelines
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16.1 Water quality guidelines
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16.1.1 Drinking Water
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16.1 Water quality guidelines
16.1.2 Toxicity
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16.1 Water quality guidelines16.1.3 Irrigation water
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16.1 Water quality guidelines16.1.3 Irrigation water
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Runoff from feedlots, cultivated land, logged forests, and construction sites.
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16.2 Waste Water and its treatment16.2.1 Introduction
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Biological oxygen demand (BOD) is the amount of O2 (in milligram) required to carry out the oxidation of organic carbon in one liter of water.
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The objectives for water treatment derive from two concerns:
Human health and welfare
The health of aquatic ecosystems
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16.2 Waste Water and its treatment16.2.3 Tertiary TreatmentAlso called advanced waste treatment, includes a variety of processes performed on the effluent from secondary waste treatment.
Remove P nutrients:Remove P nutrients:
P removal by precipitation with lime:
3 PO43- + CaO (lime) Ca5(PO4)3(OH)
Phosphate can also be removed by microorganisms that absorb phosphate.
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Systems add disinfectants to destroy microorganisms that
can cause disease in humans. Public water treatment systems are required to disinfect water
obtained from different sources, surface or groundwater.
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Anthrax spore decontamination using chlorine dioxide