Waste Water Treatment (My Set)

Front 1

Many outbreaks of communicable diseases have been traced to direct contamination of drinking water from human waste. These diseases include:

Back 1

Typhoid, Cholera, Dysentery, Polio, Hepatitis

Front 2

What is stabilization?

Back 2

conversion to a form that resists change. Organic material that is stabilized by bacteria that convert the material to gases and other relatively inert substances.

Front 3

What is the wastewater treatment process overview?

Back 3

Influent - Bar racks - Pumps in a wet well - grit chamber- communitor - flowmeter or parshall flume - primary clarifier - aeration tank - secondary clarifier - disinfection -effluent to reclamation and reuse

Front 4

What device is use to measure settable solids in ml/L?

Back 4

THE IMHOFF CONE

Front 5

How is the weight of nonsettable solids measured?

Back 5

subtract the weight of dissolved and settable solids from the weight of dissolved and settable solids from the total solids.

Front 6

What is BOD?

Back 6

BIOCHEMICAL OXYGEN Demand

Front 7

What is MPN?

Back 7

Most probable number?

Front 8

What are the three major parts of a wastewater facility?

Back 8

collection, treatment, and discharge

Front 9

Treatment process overview

Back 9

Influent - screening -grit removal - pre-aeration - flowmeter - sedimentation and flotation - secondary treatment and solids handling - biological, chemical & physical process - disinfection - effluent

Front 10

What is the purpose of biological, chemical & physical processes?

Back 10

to remove suspended & dissolved solids

Front 11

Sanitary sewers are normally place at a slope sufficient to produce a water velocity of what?

Back 11

2ft./sec.

Front 12

Man holes are placed every ____ to _____ to allow for cleaning.

Back 12

300 to 500 ft.

Front 13

Sewer pipes are lade at a slope steep enough to maintain a flow of 2ft./sec to prevent what?

Back 13

grit from settling in the pipes.

Front 14

What is a Parshall flume?

Back 14

It is a narrow place in an open channel that allows the quantity of flow to be determined by measuring the depth of flow.

Front 15

What is a measuring device used for flow metering?

Back 15

The Venturi meter

Front 16

What is the detention time normally of the primary clarifier?

Back 16

1.5 to 2 hrs.

Front 17

What filter is the oldest and most dependable in the biological treatment process?

Back 17

Trickling filter

Front 18

The trickling filter is also a contact biological filter where organisms use oxygen from the surrounding air made possible by void created by what size rock?

Back 18

1.5" to 5"

Front 19

Activated Sludge process is used where land is expensive and large amount of waste need to be treated. Activated sludge is used in tanks and oxygen is?

Back 19

Pumped to it by compressed air bubbling up.

Front 20

By the time the activated sludge the end of the tank, usually 4-8 hours, this sludge is called what?

Back 20

Mixed Liquor

Front 21

Activated Sludge is reclaimed for reuse early in what process?

Back 21

Secondary treatment or secondary clarifying

Front 22

Why are floatable solids undesirable in effluent?

Back 22

Because it means inadequate treated waste water.

Front 23

What is a Facultative Pond?

Back 23

aerobic and anaerobic settling ponds. Little bacteria is present, and algae supply the oxygen.

Front 24

Hydrogen sulfide gas may be released by _________ bacteria and cause....

Back 24

Anaerobic bacteria, and cause odor problems, damage concrete, and makes waste more difficult to treat.

Front 25

What is the plant process for waste water?

Back 25

Influent - bar racks - flowmeter or Parshall flume - comminutor - wet well - primary sedimentation tank - trickling filter - secondary clarifier - disinfection

Front 26

Preliminary treatment includes...

Back 26

Screening, shredding, and grit removal to prevent plant flow blockage or damage damage to pumps.

Front 27

Trickling filters remove how much BOD causing waste?

Back 27

70 -85%

Front 28

Where is the trickling filter or roatataing biological contactor located?

Back 28

After the primary clarifier.

Front 29

Why are most digestion tanks are mixed continuously?

Back 29

To bring the food to the organisms, to provide a uniform temperature, and to avoid the formation of thick scum blankets.

Front 30

What is supernatant?

Back 30

It is the portion between the sludge on the bottom and the scum on the surfaced.

Front 31

What is supernatant used for after it is removed?

Back 31

It is returned to the influent well or the primary clarifier.

Front 32

What portion of the treatment plant does the head works refer to?

Back 32

The facilities where wastewater enters a waste water treatment plant. The head works may consist of bar screens, comminutors, a wet well, and pumps.

Front 33

What is the BOD test?

Back 33

It is a test that measures the rate of oxygen use under controlled conditions of time and temperature. Standard test conditions include dark incubation at 20 degrees Celsius for usually 5 days.

Front 34

What is a disadvantage of using a weir in part to measure flow?

Back 34

It creates dead space upstream where solids can settle out, which will create odors and also inaccurate readings of flow.

Front 35

What is the flow velocity typically in the sedimentation/primary treatment tanks?

Back 35

0.03 feet per second

Front 36

What are two shapes of clarifiers?

Back 36

Rectangular or circular

Front 37

What is the detention time of the primary clarifier?

Back 37

1.5 to 2 hours

Front 38

Removal of solids in the clarifiers largely depends on detention time and what?

Back 38

The amount of BOD contained in the settled material.

Front 39

What is alkalinity?

Back 39

The capacity of water or waste water to neutralize acids. It is a measure of how much acid must be added to a liquid to lower the pH to 4.5.