WASTEWATER OPERATOR CERTIFICATION STUDY GUIDE

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WASTEWATER OPERATOR CERTIFICATION STUDY GUIDE

GRADE 1 EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -99 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Wastewater Solids Processing: The solids treatment method uses a partially submerged rotating drum

Answer:

vacuum filter Question 2: Phosphorus Removal: That is the main reason why wastewater treatment plants remove phosphorous from their effluent before discharging to a lake or river?

Answer:

the reduce the growth of algae Question 3: WasteWater Sources & Characteristics: Generally, the % of dissolved solids in the amount of total solids is about

Answer:

70% Question 4: WasteWater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of solids

Answer:

30%

Question 5: Safety: What is the minimum number of people that should be on-site working at a confined space site?where one of them is entering a manhole

Answer:

3

Question 6: Sampling, testing & reporting

BOD5 samples can be preserved by

Answer:

storing them in a refrigerator above freezing and up to 4 degrees C Question 7: Waste Treatment Ponds: Ponds used in series after primary wastewater treatment are sometimes called

Answer:

oxidation ponds Question 8: Basic Chemistry: The electrical potential between two points is measured in

Answer:

volts Question 9: Preliminary Treatment: What is the angle of the bards on a mechanically cleaned bar screen

Answer:

45-60 degrees Question 10: Safety: How far back from the opening of a trench should soil be excavated from that tench be placed

Answer:

• ft at least

Question 11: Basic Chemistry: What acids are formed when water reacts with nonmetal oxides?

• acid hydroxides
• acid anhydrides
• acid oxides

• acid hydrates

Answer:

acid anhydrides Question 12: Maintenance: what type of fuses would most likely be used to protect a meter?

Answer:

dual-element fuses Question 13: Primary Sedimentation: The color of bio film on a rotating Biological Contactor would appear____under normal operating conditions

Answer:

gray Question 14: Safety: Why is it essential to ventilate a valve before entry

Answer:

remove dangerous gases

Question 15: Sampling, testing & reporting

Tests such as pH, temperature and dissolved oxygen should always be performed within____after collection

Answer:

15 min Question 16: WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit?

Answer:

storm events Question 17: Safety: What class of fire involves oil and grease?

Answer:

class B

Question 18: Basic WasteWater Treatment: Once the oxygen is depleted in a natural body of water, which organisms take over?

Answer:

anaerobic Question 19: Safety: The primary purpose of check vales is to prevent

Answer:

water from flowing in 2 directions Question 20: Wastewater Solids Processing:

This solids retention treatment method usually has 20 days of retention time:

Answer:

aerobic digestion

Question 21: Sampling, testing & reporting

The maximum holding time for a preserved total suspended solids sample is:

Answer:

• days

Question 22: Basic WasteWater Treatment: Aerobic bacteria will reproduce and live in an environment that contains only

Answer:

oxygen Question 23: Preliminary Treatment: What is the angle of the bars on a manually cleaned bar screen?

Answer:

30 degrees Question 24: Basic Chemistry: What is the most common use today for a positive-displacement pump

Answer:

chemical feed pump