Waste Water Treatment Webquest Chapter 18-4 Introduction

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AP Environmental Science





Name______________________________

Chapter 18 Water Quality





Per 3 5 8 Date_________ Score________



Waste Water Treatment
Webquest

Chapter 18
-
4



Introduction





For thousands of years, civilizations have used water to carry wastes away from
homes and workplaces.


In the past, the guiding principle was that the "solution to pollution is dilution".


No
matter how dirty something is, if you throw

enough water at it, it will disappear.


Modern science has shown
us that simple forms of waste treatment like dilution only solve a small part of the problem.




Task


You will inv
estigate how water is purified through

modern wastewater treatment methods
, the effects of
those methods on the environment, and predict the future evolution of wastewater treatment as our
government debates the seriousness of current water pollution.























The Process



1.

Review Figure 1 above to understand how

wastewater is processed. This is a basic diagram to show
you how the water is purified to be returned to a local watershed.


2.

Open this site:
http://www.metrocouncil.org/environment/Ki
ds/index.htm

and read each of the
slides on this site to give you an introduction to the wastewater treatment process.


3.

You will take the virtual tour of the Blaine Sanitary Water District:
http://esa21.kennesaw.edu/activities/ww
-
treatment/ww
-
tour
-
dc/blue_plains.swf


A. Click on the following numbers to help you understand what occurs during each step of WWT


Process and record answers only to the
stated
q
uestions for each.
Also click on the pictures to


help

you understand these basic steps.




Figure 1: Basic Wastewater
Treatment process


#1 Debris and Gut Removal Building
-


A.

What happens here?




#2 Primary Sediment Building


A. What is meant by sedimentation?





B. Why are
salts added to the water?





#3 Secondary Reactors Building


A. Click on the third image


What is added to the water and why?






#4

Secondary Sedimentation Building


A. What happens here between the solids and liquids?





#5

Nitrificatio
n/Denitrification Building

A.
What is the purpose of this key step?




#6 Nitrification Sedimentation Basins Building

A. What continues at this location?




#7

Nitrification Sedimentation Basins Building

A.
What are these basins designed to do?



#8 Fil
tration and Disinfection Building

A. What happens here?




B. What prevents any solids from entering the Potomac River?




C. Why is sand used in this step?













AP Environmental Science





Name______________________________

Chapter 18 Water
Quality





Per 3 5 8 Date_________ Score________



Waste Water Treatment Homework

Chapter 18
-
4


(Attach your labeled drawing/picture to this assignment page.)



1.
Using your textbook, page 414, Figure 18.23, make a drawing of the

wastewater trea
tment
processes OR obtain a drawing from the internet to use as you complete the steps below of this
assignment.

NOTE: DRAW A TEXTBOX UNDER EACH STEP SO THAT YOU CAN RECORD THE APPLICABLE
TREATMENT.


2.
Using your textbook, pages 412
-
416
, find the foll
owing information for each of the 4 processes:





A.


What activity takes place from flushing to when the water reaches the treatment plant?




B. Label each of the processes of your drawing: Primary (Grit Chamber and Primary Sedimentation)
,



Secondary (Aeration, Final Settling, Air pump, sludge line, Sludge incineration), Disinfection Tank and


Tertiary process.





C. Using your
text, write what occurs at each step of the wastewater treatment process.


Thinking Out of th
e Box
--
Points to Ponder:


3. What biological organism is used to assist in the purification of wastewater?



4.

What is their role in this process?




5.

Describe

any

additional wastewater treatments that may be used in the future to better
remove

p
ollutants
.




6.

Describe ele
ments in the waste stream that c
ould

possibly

disrupt any of these p
rocesses.





7.

Do you believe there is a way to prevent

poll
utants from entering the waste stream? Give a valid
expla
nation

to support your answer.





(2011 Modified by T. D
elli Paoli; original lesson

by Max Driggs and Mike Eliot, De Anza High School, Richmond, CA.
)