Chapter 22 Water Pollution and Treatment

Biochemical Oxygen Demand The amount of oxygen required for biochemical decomposition process 3 zones A pollution zone An active decomposition zone A recovery zone

Draw 2 graphs: Temp vs. O2 Pressure vs. O2

Waterborne Disease Outbreaks of waterborne diseases –Milwaukee, WIMilwaukee, WI –Haiti Cholera OutbreakHaiti Cholera Outbreak –Waterborne Disease is World’s Leading KillerWaterborne Disease is World’s Leading Killer

Nutrients Eutrophication –The process by which a body of water develops a high concentration of nutrients Cultural Eutrophication –When eutrophication is accelerated by human processes that add nutrients to a body of water

Acid Mine Drainage Water with a high concentration of sulfuric acid that drains from mines Serious water pollution problem Damages aquatic ecosystems, pollutes bodies of water and degrades water quality

Surface Water Pollution Water Pollutants are emitted from –Point Sources Distinct and confined sources such as pipes from industrial or sites –Nonpoint Sources Diffused and intermittent Ex) runoffs from streets

Groundwater Pollution Bioremediation: –a method of treating groundwater pollution problems that utilizes microorganisms in the ground to consume or break down pollutants

Wastewater Treatment Septic Tank Disposal Systems Waste Treatment Plants –Primary Treatment –Secondary Treatment –Advanced Treatment –Chlorine Treatment

Wastewater Renovation and Conservation Cycle Steps: –1. Return of treated wastewater to crops –2. Renovation or natural purification by slow percolation of the wastewater into soil to eventually recharge the groundwater resource with clean water –3. Reuse of the treated water

Water Reuse Inadvertent: –water is withdrawn, treated and returned to the environment Indirect: –Ex) the wastewater renovation and conservation cycle Direct: –The use of treated wastewater that is piped directly from a treatment plant to the next user

Water Pollution and Environmental Law Environmental Law –The branch of law dealing with conservation and use of natural resources and control of pollution –Click here for an overview of the laws we have to protect our water and resources!here