environmental engineering linking microbiology to engineering

20-Jan-2010 electrical, computer and energy engineering

Environmental EngineeringLinking Microbiology to Engineering

Dr. AbbazadeganGraduate Students: Lauren McBurnett and Otto Schwake

You are on the beach

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Tempe Town Lake

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What water would you drink?

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?

Environmental Engineersn Pretend you are environmental engineering expertsn Your job is to design a treatment process that will allow you to

drink the water at Tempe Town Lake

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What needs removed from the water?

n Large contaminants

n Medium contaminants

n Small contaminants

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Large Contaminant Removaln How can you remove the large contaminants?

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Prescreening Treatment

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Medium Contaminant Removaln How can you remove the dirt from the water?

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Gravity Settling Treatment

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Small Contaminant Removaln What about the dirt and oils that did not settle in the gravity

settling basin?

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What is turbidity?

Why is turbid water a problem?n Measured in terms of Nephelometric Turbidity Units (NTU)

Small Contaminant Removaln How can you remove turbidity?

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Coagulation and Flocculation Treatment

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Small Contaminant Removaln How can you remove the flocs that formed during coagulation

and flocculation?

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Secondary Settling Treatment

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Small Contaminant Removaln How can you remove the particles that did not join flocs or those

that did join flocs but were not heavy enough to sink?n What about removing odor?

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Filtration Treatment

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Filtration Mechanisms

Filtration Soils

Activated Carbon

Small Contaminant Removaln How can you remove the microbes from the water?

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Chlorination Disinfection Treatment

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Drinking Water Treatment

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Environmental Engineersn Your next job is to design a treatment system to filter Tempe

Town Lake and other unknown dirty water samples

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Filtration Design Questionsn What is filtration?n What types of filtration are there?n What is filtered out during filtration?n What factors are used to define what is filterable?

Filtration Engineering and Design

Before Coming to ASUn Design a filtern In groups of 3 or 4

n Incomplete Materials List– Coarse Aggregate– Fine Soil– Container

Filtration Engineering and Design

While at ASUn Test your filter’s ability

remove – Odor– Turbidity– Microbes– Chemicals– Color

Scoringn Categories

– Highest Microbial Removal– Most Effective Odor Removal– Most Effective Color Removal– Lowest Cost

– Overall Winner– Highest score in

microbiological, odor and color categories versus the cost of the filter