Transcript Ray Young, P.E., Water Engineers - Eng.hctx.net

PREDICTED RESIDENTIAL WATER USE SOURCES
Usage Rate
Usage Factor
Water Use
gal/day/cap
Toilet Flushing
1.6 gal/flush
4 flushes/day/cap
6.4
Dishwasher
6.5 gal/load
0.25/day/cap
1.6
Garbage Grinding
1.0 gal/use
0.5/day/cap
1.0
Activity
“Blackwater”
Subtotal
9.0
“Graywater”
Shower
2.5 gal/min
10 min/day/cap
25.0
Bathroom Sink
0.5 gal/use
4 uses/day
2.0
Kitchen Sink
1.0 gal/use
4 uses/day
4.0
Clothes Washing
30 gal/use
0.33 uses/day/cap
10
Subtotal
41.0
Total
50.0
PREDICTED COMMERCIAL WATER USE SOURCES
Source
Total Water Use,
Gal/Day
Toilet/Urinal, Gal/Day
(70% of Total)
Lavatory/ Coffee Bar Sink,
Gal/Day (30% of Total)
Office Employee
8
5.6
2.4
Shop/Warehouse Employee
12
8.4
3.6
NSF/ANSI STANDARD350
Onsite Residential and Commercial Water Reuse Treatment
www.nsf.org/info/nsf 350
STANDARD 350
STANDARD 350-1
Parameter
Class R
Class C
All
CBOD5
10 mg/l (25)
10 mg/l (25)
25 mg/l
TSS
10 mg/l (30)
10 mg/l (30)
30 mg/l
Turbidity
5 NTU ()
2 NTU (5)
E. Coli
14 MPN/100 ml
2.2 MPN/100 ml
pH
6.0 – 9.0
6.0 – 9.0
Chlorine
0.5 – 2.5 mg/l
0.5 – 2.5 mg/l