ch. 16 water pollution

Environmental Chemistry, vanLoon & Duffy, Chapter 16

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Guidelines

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Runoff from feedlots, cultivated land, logged forests, and construction sites.

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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 treatment16.2.2 Secondary treatment Activated Sludge Process

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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

ch. 16 water pollution

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