20-Jan-2010electrical, computer and energy engineering Environmental Engineering Linking Microbiology to Engineering Dr. Abbazadegan Graduate Students: Lauren McBurnett and Otto Schwake

You are on the beach 2

Tempe Town Lake 3

What water would you drink? 4 ?

Environmental Engineers n Pretend you are environmental engineering experts n Your job is to design a treatment process that will allow you to drink the water at Tempe Town Lake 5

What needs removed from the water? n Large contaminants n Medium contaminants n Small contaminants 6

Large Contaminant Removal n How can you remove the large contaminants? 7

Prescreening Treatment 8

Medium Contaminant Removal n How can you remove the dirt from the water? 9

Gravity Settling Treatment 10

Small Contaminant Removal n What about the dirt and oils that did not settle in the gravity settling basin? 11

What is turbidity?

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

Small Contaminant Removal n How can you remove turbidity? 14

Coagulation and Flocculation Treatment 15

Small Contaminant Removal n How can you remove the flocs that formed during coagulation and flocculation? 16

Secondary Settling Treatment 17

Small Contaminant Removal n 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? 18

Filtration Treatment 19

Filtration Mechanisms

Filtration Soils

Activated Carbon

Small Contaminant Removal n How can you remove the microbes from the water? 23

Chlorination Disinfection Treatment 24

Drinking Water Treatment 25

Environmental Engineers n Your next job is to design a treatment system to filter Tempe Town Lake and other unknown dirty water samples 26

Filtration Design Questions n 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 ASU n Design a filter n In groups of 3 or 4 n Incomplete Materials List – Coarse Aggregate – Fine Soil – Container

Filtration Engineering and Design While at ASU n Test your filter’s ability remove –Odor –Turbidity –Microbes –Chemicals –Color Scoring n 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