Wastewater Treatment Design Challenge

Parts List and Cost Analysis Form

 

Item

Cost per Item ($)

Quantity Needed

Cost Subtotal

Plastic soda bottle (any size)

0.05

 

 

Tubing

1.50/m

 

 

Straight connector for tubing

1.80

 

 

T connector for tubing

1.00

 

 

Duct tape

0.15/m

 

 

Stopper

0.15

 

 

Screen 10 cm2

0.75

 

 

Gravel 100 g

0.50

 

 

Sand 100 g

0.75

 

 

Aerator

3.00

 

 

Bucket

2.00

 

 

Activated charcoal 10 g

1.00

 

 

Alum 10 g

0.75

 

 

Source of microbes* 10 g

0.25

 

 

Coffee filter

0.10

 

 

Duckweed or other aquatic plants

(free if collected by students)

1.00

 

 

Other:

 

 

 

TOTAL COST

$

* In activated sludge treatment systems, sewage sludge is added back into the system as a rich source of microbes capable of digesting organic matter. Sludge is not an option for classroom projects because it contains disease-causing organisms, but a wide range of microbes can be found in samples of compost, soil, or sediment from a pond or stream.

 

Cost Analysis Instructions

        Under Quantity Needed, enter the # of pieces or estimated length of each item you plan to use.

        Multiply the numbers in column 2 by column 3 to obtain the subtotal for each item.

        Sum the subtotals in column 4 to determine the total cost of your design.

 

Other Materials: If approved by your teacher, you may use materials other than those listed above, with prices based on those listed in commercial catalogs.