Drinking Water, Wastewater & Water Quality
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Transcript of Drinking Water, Wastewater & Water Quality
Drinking Water, Wastewater & Water Quality
Special emphasis on NC streams
http://www.charlestonwater.com/water_trt_process.htm
Indicators of Water Quality -NC Streams
1-Chemical• Ammonia•Nitrates/Nitrites Agricultural & Domestic Sources• Phosphorus• pH of natural waters = 5.6, lower means impairment• Dissolved O2-cold temps mean high D.O.• Conductivity•Metals; Arsenic, Mercury, Iron, Copper, Zinc, Lead. Some
are from natural mineral deposits.
2-Physical• Stream Velocity• Runs• Riffles• Pools
• Turbidity• Total Dissolved Solids
3-Biotic Index•High Diversity = Good Water Quality• Low Diversity (lots of one or two organisms) means
poor water quality
Benthic Macroinvertebrates
Non-point source pollution•Sedimentation•Agricultural sites•Animal feedlots•Croplands
•Stormwater runoff•Contains oil, gas, pesticides, salt
•Metals-Even small amounts can be harmful• EPA limit for Arsenic = 10 parts per billion (ppb)
Stormwater Runoff
Sedimentation in Streams