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19 Cards in this Set
- Front
- Back
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What type of well is considered least likely to become contaminated |
Drilled
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Diatomaceous earth filters
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Should be supplemented by a chlorination system
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Microbial pollution travels only a short distance through
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Smooth clay
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What type of filter is recommended for use in small communities and rural places
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Slow sand
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All of the following are used to disinfect water
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Chlorine
Bromine Iodine |
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Backsiphonage may be prevented by all of the following methods
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Vacuum breakers
Air gap separation backpressure units |
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Which of the following is the least effective method for cadmium removal from drinking water
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Activated Carbon
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Before a drinking water sample is taken the sampling tap should be clean free of leaks and flushed for how long
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2-3 minutes
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What contaminant has been associated with learning and cognitive disorders in children who drink contaminated water
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Lead
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Maximum contaminant level
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Maximum permissible leve of a contaminant
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Coliform
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Most commonly used bacterial indicator
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Disinfection
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Method to treat contaminated water include: Chlorine, chlorine dioxide, ozone, UV radiation
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Coagulation-flocculation
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Process of combining small particles into large aggregate particles
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3 Steps to Coagulation-flocculation
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Coagulant formation; particle destablization; interparticle collision
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Water Treatment
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Coagulation; Sedimentation; Filtration; Disinfection
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Coagulation
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Add a chemical to the water
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Flocculation
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transform smaller particles into larger aggregates
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Sedimentation and flotation
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Solid-liquid gravity separation
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Filtration
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Removal of suspended matter from water as it passes through porous materials
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