WASTEWATER - Chapter 6 (CONVERSIONS)

A

Area

V

Velocity

t

Time

SVI

Sludge Volume Index

Vol

Volume

eff

Effluent

WAS

Waste Activated Sludge

RAS

Return Activated Sludge

MLSS

Mixed Liquor Suspended Solids

MLVSS

Mixed Liquor Volatile Suspended Solids

12 inches

1 ft.

36 inches

1 yard (yd.)

144 inches sq. (in. sq.)

1 foot sq. (ft.sq.)

9 feet sq. (ft.sq.)

1 yard sq. (yd. sq.)

43, 560 ft. sq.

1 acre

1 cub. ft. (cub. ft.)

1,728 cub. inch.

1 cub. ft. of WATER

7. 48 gallons (gal)

1 cub. ft. of WATER

62. 4 pounds (lb)

1 gallon of water

8.34 pounds (lb)

1 liter

1,000 milliliters (mL)

1 gram

1,000 milligrams (mg)

1 million gallons per day (MGD)

694 gallons per minute (gpm)

1 million gallons per day (MGD)

1.545 cub.ft/sec

Average BOD/ Capita/ Day

0.17 pounds (lb)

Average SS/capita/day

0.20

Average daily flow

Assume 100 gal/capita/day

SVI (Sludge Volume Index)

volume/concentration x 100

Q (Flow)

A x V

Detention Time

Volume/Q

Volume (V)

L x W x D

Area (A)

W x L

Circular Area

pi x (radius)^2 = (0.785 x diameter^2)

Circumference

pi x diameter

Hydraulic Loading rate

Q/A

Sludge Area

MLSS (lb) in aeration tank/SS in primary effluent (lb/day)

Mean Cell Residence Time (MCRT)

SS (lb) Secondary System x (Aeration Tank + Secondary clarifier)/WAS (lb/day) + SS in effluent (lb/day)

Organic Loading Rate

BOD (lb/day) / Volume

1 in.

2.54 cm

1 ft.

30.5 cm

1m

100 cm

1 m

3.281 ft

1 m

39.4 in.

1 acre

43, 560 sq. ft.

1 yd.

3 ft.

1 cub.ft. of water

62.4 lb

1 gal

8.34 lb

1 lb.

453.6 g

1 kg

1000 g

1 kg

2.2 lb

1%

10,000 mg/L

1 mg

1,000 ug (micrograms)

1 gal

3.785 L

1 cub.ft.

7.48 gal

1 L

1000 mL

1 acre foot

43, 560 cub. ft.

1 gal

32 cups

1 lb.

16 oz. dry wt.

1 ft. of head

0.433 psi

1 psi

2.31 ft of head

1 cfs

1440 gpm

1 cub.ft./sec

7.48 gal

1 gpm

1440 gpd

'F to 'C

get the smaller

C' to 'F

get the higher