California Grade Iv/v Wastewater Certification Exam

Front 1

How many acre feet per million gallons? (Pond conversion)

Back 1

3.069 ac•ft/Mgal

Front 2

Gallons per cubic feet

Back 2

7.48 gal/ft³

Front 3

Square feet per acre

Back 3

43,560 ft²/ac

Front 4

Minutes per day

Back 4

1440 min/d

Front 5

Seconds per day

Back 5

86,400 s/d

Front 6

PSI per foot

Back 6

0.433 PSI/ft

Front 7

Kilowatts per horsepower

Back 7

0.746 kW/HP

Front 8

Foot pounds per minute horsepower

Back 8

33,000 ft•lb/min•HP

Front 9

Cubic feet per cubic yard

Back 9

27ft³/yd³

Front 10

Pounds per gallon (specific gravity not given)

Back 10

8.34 lb/gal

Front 11

Pounds per gallon (specific gravity given)

Back 11

(SG•8.34) lb/gal

Front 12

Area of a circle

Back 12

0.785•D²

Front 13

Sides of a cylinder

Back 13

A=C•H, A=3.1416•D•H

Front 14

Cylindrical volume

Back 14

V=.785•D²•H

Front 15

Conical volune

Back 15

1/3•0.785•D²•H

Front 16

Rectangle volume

Back 16

V=L•W•D

Front 17

Organic loading to a pond

Back 17

lbBOD/d•ac

Front 18

Organic loading to a trickling filter

Back 18

lbBOD/d•1000ft³

Front 19

Organic loading to aeration basin

Back 19

lbBOD/d•1000ft³

Front 20

Organic loading to a digester

Back 20

lbVS/d•ft³

Front 21

What three constituents must be met for a BOD test to be considered valid?

Back 21

1. Change of DO in blank must be 0.2mgDO/L or less

2. Change of DO in samples must be 2.0 mgDO/L or more

3. Final DO in sample bottles must be 1.0 mgDO/L or more

Front 22

When a BOD test is run with inhibitor, what is being tested?

Back 22

cBOD

Front 23

NOD= x–y

Back 23

NOD=BOD–cBOD

Front 24

BOD= x + y

Back 24

BOD= cBOD + NOD (sometimes called NBOD)

Front 25

What volume is a standard BOD bottle?

Back 25

300mL

Front 26

BOD formula

Back 26

BOD= (change in DO [mg/L]• bottle volume) / sample volume

Front 27

VSR formula

Back 27

(.VSin–.VSout) /

.VSin–(.VSin•.VSout)

Front 28

Percent volatile

Back 28

mgVSS (or VS or MLVSS) /

mgTSS (or TS or MLSS)

Front 29

Percent removal (C=concentration)

Back 29

(Cin–Cout)/

Cin

Front 30

Percent solids recovery

Back 30

lbTS in product /

lbTS in sludge

Front 31

Percent efficiency (motors, pumps, etc.)

Back 31

Power out /

Power in

Front 32

SVI express in?

Back 32

mL/g

Front 33

SVI formula

Back 33

SSV (after 30 mins) • 1000 /

MLSS concentration

Front 34

MCRT is expressed in what?

Back 34

Days