WasteWater Operator Certification Flashcards Grade 1

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Questions and Answers

What is the most common reason for wastewater to contain intermittent large amounts of sand, gravel, and grit?

Storm events (correct)

Regular sewage flow

Industrial discharge

Chemical run-off

Combined wastewater is defined as?

Sanitary wastewater and stormwater runoff

In general, what is the solids content in wastewater?

0.1%

In general, what is the percentage of suspended solids in the total amount of solids?

30% Signup and view all the answers

Generally, what is the percentage of dissolved solids in the total amount of solids?

70% Signup and view all the answers

Which type of organisms would most probably be associated with poor treatment or young biomass?

Amoebas Signup and view all the answers

Which type of organisms would most probably be associated with very clear plant effluent, low BOD and low amounts of suspended solids?

Stalked ciliates Signup and view all the answers

Aerobic bacteria will reproduce and live in an environment that contains only?

Oxygen Signup and view all the answers

Anaerobic bacteria will reproduce and live only in an environment that completely lacks?

Free or dissolved oxygen Signup and view all the answers

The biochemical oxygen demand (BOD) test usually has a specific time of?

5 days Signup and view all the answers

An Imhoff cone measures?

Volume of settleable solids Signup and view all the answers

Septic conditions are caused by?

Anaerobic bacteria Signup and view all the answers

Scum is usually removed in the _____ treatment stage.

Primary Signup and view all the answers

When domestic wastewater enters natural waters, what species deplete most of the oxygen?

Aerobic bacteria Signup and view all the answers

Once the oxygen is depleted in a natural body of water, which organisms take over?

Anaerobic Signup and view all the answers

The major gas produced by anaerobic decomposition is?

Methane Signup and view all the answers

Another name for primary treatment is?

Sedimentation Signup and view all the answers

Digester gas is _______ when mixed with air in the proper proportions.

Extremely explosive Signup and view all the answers

A pond that is used to treat raw wastewater is called?

A waste stabilization pond Signup and view all the answers

A pond that has an aerobic top layer and an anaerobic bottom layer is called?

A facultative pond Signup and view all the answers

What is the angle of the bars on a manually cleaned bar screen?

30 degrees Signup and view all the answers

What is the angle of the bars on a mechanically cleaned bar screen?

45-60 degrees Signup and view all the answers

What is the ideal wastewater velocity in FPS through a screen channel?

1.5 ft/s Signup and view all the answers

What is the ideal wastewater velocity in FPS for grit removal in a grit chamber?

1.0 ft/s Signup and view all the answers

In general, what is the water content of screen material?

80% Signup and view all the answers

What is the wastewater velocity range in FPS for grit removal in a grit chamber?

0.7 - 1.4 ft/s Signup and view all the answers

Which one of the following chemicals gives water its greatest capacity to neutralize acids?

Hydroxide Signup and view all the answers

The bar rack is used?

When the bar screen is out of service Signup and view all the answers

Typically, what is the average detention time for wastewater in a primary clarifier?

2 hr Signup and view all the answers

Name one gas that irritates the eyes.

Chlorine Signup and view all the answers

Activated sludge clarifiers accept material to be settled from?

An aeration tank Signup and view all the answers

Study Notes

WasteWater Sources & Characteristics

Storm events are the primary cause of wastewater containing large amounts of sand, gravel, and grit.
Combined wastewater consists of sanitary wastewater and stormwater runoff.
Wastewater typically has a solids content of approximately 0.1%.
Out of total solids in wastewater, around 30% is made up of suspended solids.
Dissolved solids usually constitute about 70% of the total solids.
Poor treatment or young biomass is often indicated by the presence of amoebas.
Stalked ciliates are associated with very clear plant effluent, characterized by low BOD and minimal suspended solids.

Basic WasteWater Treatment

Aerobic bacteria thrive in environments with only oxygen.
Anaerobic bacteria require environments free of dissolved oxygen.
The biochemical oxygen demand (BOD) test is commonly conducted over a 5-day period.
An Imhoff cone is used to measure the volume of settleable solids in wastewater.
Septic conditions occur due to the activity of anaerobic bacteria.
Scum is typically removed during the primary treatment stage.
When domestic wastewater is released into natural waters, aerobic bacteria deplete most oxygen.
Once oxygen is depleted, anaerobic organisms take over in the water body.
Methane is the primary gas produced through anaerobic decomposition.

Wastewater Treatment Facilities

Primary treatment is also referred to as sedimentation.
Digester gas can be extremely explosive when mixed with air in the right proportions.
A waste stabilization pond is utilized for treating raw wastewater.
A facultative pond features an aerobic top layer and an anaerobic bottom layer.

Preliminary Treatment

Manually cleaned bar screens are set at a 30-degree angle.
Mechanically cleaned bar screens are oriented at angles between 45-60 degrees.
The ideal wastewater velocity through a screen channel is 1.5 feet per second (fps).
For grit removal in a grit chamber, the ideal velocity is 1.0 fps.
Screen material generally has a water content of about 80%.
The velocity range for effective grit removal in a grit chamber is between 0.7 and 1.4 fps.

Racks, Screens, Comminutors, and Grit Removal

Hydroxide provides water with its highest capacity for neutralizing acids.
Bar racks are employed when bar screens are temporarily out of service.

Primary Sedimentation

The average detention time for wastewater in a primary clarifier is typically around 2 hours.
Material for activated sludge clarifiers is sourced from an aeration tank.
Chlorine gas is known to irritate the eyes.

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Description

Prepare for the WasteWater Operator Certification with these informative flashcards designed for Grade 1. Each card covers essential topics such as wastewater sources and characteristics, helping you grasp key concepts necessary for certification. Use this study guide to familiarize yourself with important definitions and terms in the wastewater field.