Unformatted text preview: Water Quality Standards MCLs -- MCLGs-- SMCLs-- Organic mater BOD: Sources of oxygendemanding waste: Microbes Nutrients Two important nutrients: Major problems: Cultural eutrophication Major sources for nutrients: Oil Major problems: Major sources: Toxic Waste Hazardous chemicals: Heavy Metals: Radioactive materials Sediment Sand and smaller particles Polluted streams, lakes, reservoirs, even ocean water Major sources: Greatest pollutant by volume Sources of Contamination Point Source direct discharge from a known location Waste water treatment plants industry Nonpoint source diffuse or regional discharge Runoff Atmospheric deposition Surface Water Contamination Urban runoff Agriculture Fertilizer and pesticide Animal waste GW Contamination LUSTs Landfills Septic systems Salt water intrusion Infiltration from urban and agricultural runoff Fig. 19.26 b
W. W. Norton Fig. 19.25 c
W. W. Norton Groundwater Treatment Remediating (cleaning) contaminated water "pump and treat" method Expensive Difficult to clean whole site Bioremediation Special microbes (bacteria) breakdown chemicals Natural attenuation Waste Water Treatment Law: used waste water must be treated Break the potential vicious cycle of waste water entering the general water cycle Tier treatment and reuse system Septic system- rural residential areas Water treatment plant for towns and urban cities Innovated ways for recycling and reclaiming waste water New technologies for innovative waste water ...
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- Spring '08
- W. W. Norton, waste water treatment