Chapter 22 Water Pollution and Treatment. Biochemical Oxygen Demand The amount of oxygen required for biochemical decomposition process 3 zones A pollution.
Post on 17-Dec-2015
222 Views
Preview:
Transcript
Chapter 22
Water Pollution and Treatment
Biochemical Oxygen Demand• The amount of oxygen required for
biochemical decomposition process
• 3 zonesA 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, WI– Haiti Cholera Outbreak– Waterborne 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Water ReuseInadvertent: – water is withdrawn, treated and returned to the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!
top related