Wastewater Class A Texas ( test 4) Questions With Rational Solutions

Wastewater Class A Texas ( test 4)
Questions With Rational Solutions

The term pathogenic means - CORRECT ANSWER-Capable of causing disease



Question: The minimum separation, between sewer lines, and potable water lines is



A. 8 feet

B. 9 feet

C. 10 feet - CORRECT ANSWER-B. 9 feet



Question: before entering a confined space, a worker should perform, what procedures
- CORRECT ANSWER-Answer:have an approved monitoring device, and check, for the
presence of dangerous gasses, ventilate, the space with a blower, wear a safety
harness, and be attach to a life line



A properly designed, and operated primary sedimentation tank, should remove what
percent of incoming BOD.



A.20% to 30%

B. 25 % to 50%

C. 30% to 40% - CORRECT ANSWER-C. 30 to 40%



What Devices, can be used, to determine, the level of sewage, in a lift station -
CORRECT ANSWER-Answer: air bubbler, floats, electrodes, Acoustic (sonic), radar

,What, is the most important role, of aerobic bacteria, in the treatment, of wastewater? -
CORRECT ANSWER-decomposition, of organic matter



Question: How is the hydraulic loading, of a trickling filter, determined - CORRECT
ANSWER-Answer:flow rate, and filter area



Question: what equipment, or methods, can be used, to dewater sludge - CORRECT
ANSWER-Answer: belt press, drying beds, solid bowl, centrifuge, gravity thickener



Question: what are the Most important factors, to providing adequate sewage treatment,
in a stabilization pond - CORRECT ANSWER-Answer: sunlight, algae, bacteria and,
time



Question: what do Offensive, and objectionable odors, in a trickling filter, usually
indicate - CORRECT ANSWER-Answer: septic conditions exist



Question: Dissolved Oxygen, (DO) in a activated sludge, aeration tank, should be
maintained in What range - CORRECT ANSWER-Answer: 2, to 4, milligram, per liter



Question:what factors Contribute to infiltration in a collection system - CORRECT
ANSWER-Answer: breaks in the main lines, high ground water levels, heavy rains,
hydro jet cleaning, of plugged mains



Question: what happen When a centrifugal pump loses prime - CORRECT ANSWER-
Answer: it is no longer moving liquid



A Rotating Biological Contactor, or , RBC, is a _______biological treatment process



A. fixed film

, B. Surface film

C. suspended growth - CORRECT ANSWER-A. fixed film



Question:what Needs to be checked regularly, to properly operate, an activated sludge
treatment plant - CORRECT ANSWER-Answer: aeration equipment, and mixed liquor
solids



Question: what is Point source, discharge - CORRECT ANSWER-Answer: a discharge
that comes from a pipe or ditch that is monitored, controlled, and inspected



Question: what is a Non-point discharge - CORRECT ANSWER-Answer: a discharge
that may have an intermittent, or dispersed, flow having little, or no control



The Texas Water Code establishes the protection of water quality and quantity of the
state by - CORRECT ANSWER-setting stream standards, issues permits for
discharges, identifies non-point source controls, and establishes water reuse.



An important step, in testing a sample, for Total Suspended Solids is - CORRECT
ANSWER-Filtering a sample



Biochemical oxygen Demand, (BOD) test is based on? - CORRECT ANSWER-
Measuring, the dissolved oxygen, used



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



Question: 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