Waste Water C Exam Flashcards

Front 1

Required chemical coagulation doses are commonly determines by what test

Back 1

Jar Tests

Front 2

Which process control guideline changes both The weight of solids in an aeration tank and The age of the sludge

Back 2

Wasting

Front 3

Contact time within a chlorine tank should be atleast ____ minutes during periods of high flows

Back 3

Atleast 20 Minutes

Front 4

Bulking of activated sludge refers to

Back 4

A decrease in the ability of the sludge to settle and its loss over the effluent weirs

Front 5

The main action of a fixed media filter is

Back 5

Straining

Front 6

Not supplying enough air to the aeration tank will cause

Back 6

Turbidity of the final effluent to increase

Front 7

The reaction of chlorine and ammonia in wastewater produces a compound called

Back 7

Chloramine

Front 8

A wet well probe is usually used for ____ determinations of level

Back 8

Single Point

Front 9

FAC 62-601 states that the owner of a treatment facility shall retain operating records for a period of

Back 9

3 years

Front 10

Ponds which are used following a secondary form of waste treatment are usually called ____ ponds

Back 10

Polishing

Front 11

As the wastewater is sprayed over and trickles along the media surface, ____ is dissolved in the wastewater

Back 11

Oxygen

Front 12

A pond operating depth of atleast ____ feet is recommended to prevent Tule and Cattail growth

Back 12

3 Feet

Front 13

A rise in the SVI indicates that

Back 13

Sludge bulking may be occuring

Front 14

The single most important point of the WAS control method used is that; The amount of settleable solids generated daily must be ____ to maintain the best relationship between the microorganisms and the food

Back 14

Removed

Front 15

FAC 62-600 lists effluent discharge requirements for BOD, Total Suspended Solids in secondary treatment process at

Back 15

90% removal or 20 mg/L whichever is most stringent

Front 16

In withdrawing sludge from a digester, it is necessary to allow some sludge to remain in the digester to

Back 16

Provide seeding material for the new raw sludge to be entered

Front 17

In a properly designed and operated wastewater treatment plant, incorporating primary and secondary treatment, what percentage of BOD reduction can be expected

Back 17

85%

Front 18

The strength of wastewater is most clearly related to the concentration of

Back 18

Organic Solids

Front 19

Good settling sludge quality of activated sludge is indicated by a

Back 19

Low SVI

Front 20

Chloramine are

Back 20

Combined Chlorine

Front 21

When organic wastes are discharged to receiving waters oxygen is depleted by

Back 21

Bacteria

Front 22

The solids in raw sewage can be broken down into two groups

Back 22

Organic and Inorganic

Front 23

The most important purpose of chlorination in a sewage treatment plant is for the

Back 23

Disinfection of the effluent

Front 24

Ponding is a serious problem associated with trickling filters. What is the cause of ponding

Back 24

Excessive Oranic Loading

Front 25

What test is used to measure the strength of wastewater

Back 25

BOD test

Front 26

Characteristics that should be measured immediately after the sample is collected are

Back 26

D.O.
pH
Temperature

Front 27

An RBC designed for nitrification usually will have four stages and DO levels of ____

Back 27

4.0 to 8.0 ppm

Front 28

What might cause a white filamentous growth in a RBC system

Back 28

Septic Sludge Or
Industrial Waste

Front 29

The correct location of the exhaust fan suction in the chlorinator room is

Back 29

Near the floor

Front 30

What is the minimum size sewer pipe that should be used in a public system

Back 30

6 Inches

Front 31

Air flow through a trickling filter when the influent is warmer than the air temperature is

Back 31

Upwards through the filter

Front 32

When a high organic waste load reaches an activated sludge plant, the operators first indicator is a decrease in

Back 32

DO Residual in the Aeration Tank

Front 33

The operator observed small particles of ashlike material floating on the clarifier surface. This can be caused by

Back 33

The beginning of denitrification

Front 34

A ball check valve will most likely be found in what type of pump

Back 34

Reciprcating Pump

Front 35

The purpose of a trickling filter is to

Back 35

Oxidize the organic material

Front 36

Under ice and snow cover the BOD level in ponds will normally

Back 36

Increase slowly

Front 37

An incubator for the BOD test should be controlled at ____ degrees C

Back 37

20 degrees C

Front 38

Cathodic protection for an underground liftstation means the liftstation is protected against

Back 38

Electrolytic Corrosion

Front 39

Why must an operator be careful when returning supernate from a digester back to the activated sludge proces

Back 39

Because it is a HIGH oxygen demand source and can upset the present f/m load parameter when mixed

Front 40

Better operational performance occurs in an Anaerobic digester when

Back 40

Sludge is fed continuousley to the digester

Front 41

In an activated sludge plant it is essiential that a minimum D.O. at the effluent end of the Aeration tank be atleast

Back 41

1.0 ppm

Front 42

All of the organic matter that finds its way to the bottom of a stabilization pond is subject to ____, provided that proper conditions exist or become established

Back 42

Methane Fermentation

Front 43

The objective of ____ is to maintain a balance between the microorganisms and the BOD/Food source

Back 43

Wasting

Front 44

The rate at which microorganisms use oxygen in a wastewater to stabilize decomposing organic matter under Aerobic conditions is referred to as

Back 44

Oxygen Feed Rate

Front 45

NPDES permits apply to treatment facilities that

Back 45

Dispose of sludge solids on surface or subsurface areas

Front 46

The f/m Ratio is BEST expressed as

Back 46

lbs BOD per day per lb of mlvss

Front 47

Chlorination of the effluent of a wastewater treatment facility is usually practiced for what reason

Back 47

To kill any pathgenic bacteria which may be present

Front 48

The purpose of a sludge drying bed is to

Back 48

Provide for the separation of much of the water from the digested sludge

Front 49

The difference between an RBC unit designed for BOD removal and one designed for nitrification is the design flow per sq ft of media surface area; DO in the 1st stage of a nitrification unit will be more than 1ppm of DO and often as high as ____

Back 49

2 to 3 ppm

Front 50

A limitation of the RBC process compared with trickling filters is the lack of flexibility due to the absence of provisions for ____ and they are more sensitive to ____

Back 50

Recirulation
Industrial Waste

Front 51

The COD test has advantages over the BOD test in that

Back 51

It takes less time to run the test

Front 52

The main reason for sampling is

Back 52

To provide data for plant operations

Front 53

Nonfilterable residule can best be discribed as

Back 53

The solids that will not pass through the filter

Front 54

A trickling filter reduces the strength of waste applied to it because

Back 54

The growth which becomes established on the stone uses the sewage solids for food and converts them to a less objectionable condition

Front 55

The rules of the DEP concerning operator certification and wastewater treatment facility monitoring are

Back 55

17-16 and 17-19

Front 56

Total Solids include

Back 56

Suspended
Dissolved
Floatable

Front 57

Acids should never be added to chlorine because they

Back 57

Cause the release of Chlorine Gas

Front 58

If the sludge depth in a secondary sedimentation tank is too high what will happen

Back 58

Septic conditions may occur

Front 59

In general which one area in sampling and analysis do the most significant errors occur

Back 59

Sampling Techniques