Transcript No Slide Title - Winston-Salem/Forsyth County Schools

QUOTE FOR THE DAY
Whoever gossips to you will gossip about you.
- Spanish Proverb -
You are what you think. You are what you go for. You
are what you do!
--Bob Richards-
WATER
WINSTON-SALEM WATER
THE WINSTON-SALEM/FORSYTH COUNTY WATER
SYSTEM SERVES MORE THAN 225,000 PEOPLE.
THE AVERAGE DAILY DEMAND IS 44.3 MILLION
GALLONS.
30% COMES FROM SALEM LAKE.
70% COMES FROM THE YADKIN RIVER.
Neilson Water Treatment Plant Capacity - 48 mgpd
Northwest Water Treatment Plant Capacity - 25 mgpd
Thomas Water Treatment Plant Capacity - 24 mgpd
WATER
1976
2007
Total No.
Customers
Miles of
Water Lines
Water
Treated
No.
Employees
54,985
117,484
1,046
2,035
29 mgd
41 mgd
126
152
YOU PAY APPROXIMATELY $0.25 PER 100
GALLONS OF WATER USED.
THAT’S A REAL BARGIN.
DRINKING WATER STANDARDS
EPA SETS DRINKING WATER STANDARDS.
EPA REQUIRES COMMUNITY WATER SYSTEMS TO
TEST FOR OVER 80 CONTAMINANTS.
THE HIGHEST LEVELS ALLOWABLE ARE CALLED
MAXIMUM CONTAMINANT LEVELS (MCL’S).
FOR CONTAMINANTS THAT COULD CAUSE CANCER,
EPA SETS THE STANDARDS SO THAT THERE
WOULD BE NO MORE THAT 1 IN 10,000 TO 1 IN
1,000,000 OVER A LIFETIME.
FOR NON-CANCER CONTAMINANTS, EPA SETS THE
MCL’ S SO THAT THERE WILL BE NO RISK.
DRINKING WATER COMES FROM SURFACE WATER
AND GROUND WATER.
LARGER CITIES TEND TO USE SURFACE WATER.
SURFACE WATER WOULD INCLUDE LAKES AND
RIVERS.
. Ground water is pumped from wells that are drilled
into aquifers.
Aquifers are geologic formations that contain water.
We use tap water for various purposes. A typical
family of four on a public water supply uses about
350 gallons per day at home (each person about
350 liters per day).
A typical family of four that gets water from a
private well uses about 200 gallons per day at
home.
People in the U.S. use a lot more water that people
in other countries.
Water Use In Different Countries
Country
Annual Water Use
per Capita
(Gallons)
Percentage of Total Water Use by
Category
Residential
Industry/Agriculture*
United States
525,000
10
90
Canada
310,000
13
87
Belgium
221,000
6
94
India
132,000
3
97
China
122,000
6
94
Poland
112,000
14
86
Nicaragua
72,000
18
82
Malta
16,000
100
0
*Includes water used for electrical power and for cooling.
HOW COULD YOU REDUCE THE AMOUNT OF WATER
USED AT YOUR HOUSE?
HOW COULD YOU REDUCE THE AMOUNT OF WATER
USED AT YOUR HOUSE?
1. TAKE SHORTER SHOWERS.
2. DON’T FILL THE BATH TUB SO FULL.
3. DON’T LEAVE THE WATER RUNNING WHEN YOU
BRUSH YOUR TEETH.
4. INSTALL WATER SAVING SHOWER HEADS.
5. DON’T WASH CLOTHES UNLESS YOU HAVE A FULL
LOAD.
6. DON’T RUN THE DISHWASHER UNLESS YOU HAVE
A FULL LOAD.
7. DON’T LEAVE WATER RUNNING WHEN YOU WASH
DISHES BY HAND.
DRINKING WATER TREATMENT
1.COARSE FILTRATION – REMOVES STICKS, ROCKS,
LEAVES, FISH, BODIES, ETC.
2.COAGULATION – USUALLY THROUGH THE ADDITION OF
ALUM
3.SEDIMENTATION – ALLOWS THE COAGULATED SOLIDS TO
SETTLE OUT
4.FILTRATION –REMOVES REMAINING BACTERIA AND FINE
SOLIDS
5.DISINFECTION – USUALLY THROUGH CHLORINATION
6.AREATION
7.DISTRIBUTION
DISTRIBUTION
USE/REUSE
WASTEWATER TREATMENT
1. COARSE FILTRATION – BAR SCREEN FILTER
2. GRIT CHAMBER
3. SEDIMENTATION – SEDIMENT GOES TO DIGESTER
AND PART IS CONVERTED TO METHANE GAS. THE
REMAINDER IS USED AS SOIL CONDITIONER
4. AERATION TANK – BACTERIA EAT SOLUBLE
ORGANICS
5. CLARIFIER
6. DISINFECTION
7. DISCHARGE
WINSTON-SALEM WASTEWATER TREATMENT
PLANTS PUT WATER BACK INTO THE YADKIN RIVER
CLEANER THAN IT WAS TAKEN OUT FOR USE AS
HOUSEHOLD/INDUSTRIAL WATER.
WATER IS NOT CREATED OR DESTROYED. IT IS
SIMPLY REUSED (RECYCLED).