Lecture 23 Home Water and Bottled

Lecture 23 Home Water and Bottled - Drinking Water...

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Unformatted text preview: Drinking Water Treatment Intakes Surface Water Reservoirs Groundwater Aeration: The water is mixed to liberate dissolved gases and to suspended particles in the water column. Flocculation: The materials and particles present in drinking water (clay, organic material, metals, microorganisms) are often quite small and so will not settle out from the water column without assistance. To help the settling process along, "coagulating" compounds are added to the water, and suspended particles "stick" to these compounds and create large and heavy clumps of material. Filtration: The water is run through a series of filters which trap and remove particles still remaining in the water column. Typically, beds of sand or charcoal are used to accomplish this task. Disinfection: The water, now largely free of particles and microorganisms, is treated to destroy any remaining disease-causing pathogens. This is commonly done with chlorination or ultraviolet radiation. Initial Treatment screens Sedimentation (flocculation) 90 99% viruses Filtration Final Treatment Disinfection and Fluoridation Chlorine Gas Hypochlorite Sodium Fluoride (NaF) Sodium fluorosilicate Home Water Quality Home Water Quality Floridas Drinking Water Floridas Drinking Water Plio-pliestocene (sands) Eocene Limestone Miocene (clays) Limestone Pumped well Confined Aquifer Confined Aquifer Potential Problems: Hardness Iron + manganese Sulfur (sulfides) Salt/Salinity Pathogens (bacteria/viruses) Metals Organics Can be toxic or nuisance contaminants Nuisance Contamination Nuisance Contamination Hardness Iron Turbidity Color Odor Taste Hardness Hardness Calcium + Magnesium Soap scum, scale, cooking problems Classification mg/l or ppm Soft 0 - 17.1 Slightly hard 17.1 - 60 Moderately hard 60 - 120 Hard 120 - 180 Very Hard 180 & over Calcium Deposits Hardness Treatment Hardness Treatment Water softeners 35 gal/day/person Hard water Soft water Cation Exchange Resin Neg. Charge Na Na Na Na Na Na Na Na Cation Exchange Resins Cation Exchange Resins Ca 2+ , Mg 2+ Neg charge Na Na Na Na Mg 2+ Ca 2+ Na Na Na Na Na Na Na Na Na 4 Na + Water Hardness and Soap Scum Soap/Detergent Soap/Detergent SO 4-SO 4-SO 4-SO 4-SO 4-SO 4-SO 4-SO 4-Oil drop (C,H,O)-SO 4 Na + Sodium dodecylsulfate Extremely soluble Ca +2-SO 4-SO 4 + Less soluble Harmful Contaminants Harmful Contaminants Drinking Water Drinking Water Potable Water Pathogens Harmful Minerals/Metals Organic Chemicals Free of Toxicity...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 23 Home Water and Bottled - Drinking Water...

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