WASTEWATER CLASS B TEXAS

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WASTEWATER CLASS B TEXAS

UPDATED ACTUAL EXAM WITH

CORRECT SOLUTIONS.

The name of the State Agency responsible for enforcing pollution control laws in Texas - correct answer- Texas Commission of Environmental Quality

The term pathogenic means - correct answer- Capable of causing disease

The minimum separation between sewer lines and potable water lines is - correct answer- 9 feet

A licensed wastewater operator is a professional - correct answer- consistently does best job possible, practices personal safety, strives to improve job knowledge, strives to keep the plant and collection system in the best appearance and working order

An important step in testing a sample for Total Suspended Solids is - correct answer- Filtering a sample

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The Biochemical oxygen Demand (BOD) of a sample is based on - correct answer- Measuring the dissolved oxygen (DO) used

The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the operator - correct answer- How the plant was operating 5 days ago

Which of the following are dangerous gasses that are likely to be present in lift stations and manholes? - correct answer- Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide

A preferred hydraulic method of cleaning sewer lines is - correct answer- Hydro Jet Cleaner

Ways to reduce bad odors coming from a collection system - correct answer- routinely cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the collection system

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Types of pipe that are commonly used in wastewater collection system - correct answer- ductile iron, Poly Vinyl Chloride (PVC)

Before entering a confined space a worker should - correct answer- Use approved monitoring device and check for the presence of dangerous gasses, ventilate the space with a blower, wear a safety harness and attach a life line

A properly designed and operated primary sedimentation tank should remove _____ percent of incoming BOD - correct answer- 30-40%

Devices that may be used to determine the level of sewage in a lift station - correct answer- air bubbler, floats, electrodes, Acoustic (sonic)

What is the most important role of aerobic bacteria in the treatment of wastewater? - correct answer- decompose organic matter

The hydraulic loading of a trickling filter may be determined by - correct answer- flow rate and filter area

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These can be used to dewater sludge - correct answer- belt press, drying beds, solid bowl centrifuge, gravity thickener

Most important to providing adequate sewage treatment in a stabilization pond - correct answer- sunlight, algae, bacteria and time

Offensive and objectionable odors which sometimes occur in trickling filters usually indicate - correct answer- septic conditions are present

Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be maintained at or about - correct answer- 2 to 4 mg/L

Contributes to the infiltration in a collection system - correct answer- breaks in the main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains

When a centrifuge pump loses prime the - correct answer- pump is no longer moving liquid

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