geology_31

geology_31 - Chapter 12: Water Pollution cont. Groundwater...

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Chapter 12: Water Pollution cont. Groundwater pollution and treatment cont. Saltwater intrusion More than half of the world’s population lives in or near the coastal zones GW pollution from saltwater intrusion is not a local isolated problem Causes major water supply problems in NY, FL, CA Case History: Long Island Saltwater intrusion mechanism Water table is inclined oceanward Wedge of saltwater is inclined land ward Overpumping of GW Severe drawdown of GW causes saltwater ascension GW Treatment: Pretreatment studies Identify contaminants and their characteristics of transport behavior Identify the characteristics of aquifer geology (factors controlling GW flow—physical dimensions, structure) Determine the hydrologic characteristics of polluted aquifer(s)— flow direction, flow rates, discharge and recharge conditions Select possible treatment strategies and methods Water quality standards: MCLs—Maximum Contaminant Levels
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geology_31 - Chapter 12: Water Pollution cont. Groundwater...

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