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Basic Wastewater Operator Practice Exam | Certification Questions & Study Guide

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Exam (elaborations)

Basic Wastewater Operator Practice Exam | Certification Questions & Study Guide

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52 pages

2026/2027

Institution Water Treatment

Course Water treatment

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Prepare for a basic wastewater operator examination with this practice exam study resource. It is intended to support revision of wastewater treatment fundamentals and help learners organise their exam preparation. **Potential study areas, depending on the PDF contents:** - Wastewater treatment fundamentals - Treatment plant processes and operations - Wastewater collection and treatment systems - Sampling, testing, and water quality - Equipment operation and maintenance - Workplace safety and environmental compliance Use the document to review relevant concepts and identify topics requiring further study. **Before purchasing:** Check the preview to confirm the question count, topics covered, and whether an answer key or explanations are included. Certification terminology and requirements vary by jurisdiction, so verify that the material matches your intended examination. This is an independent study resource and is not an official certification examination publication.

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Basic,/.Wastewater,/.Operator,/.Practice,/.Exam
What,/.is,/.the,/.predominant,/.organism,/.in,/.a,/.healthy,/.activated,/.slu
dge,/.treatment,/.plant?

A.,/.Stalked,/.ciliates
B.,/.rotifers
C.,/.nematodes

D.,/.amoebas,/.-,/.correct,/.answer,/.✔ ✔ A.,/.Stalked,/.Ciliates

A,/.composite,/.sample,/.must,/.be?

A.,/.sporadically,/.collected,/.in,/.the,/.treatment,/.plant
B.,/.taken,/.at,/.one,/.time
C.,/.analyzed,/.immediately
D.,/.representative,/.and,/.sub-
samples,/.time,/.spaced,/.over,/.15,/.minutes,/.apart,/.-
,/.correct,/.answer,/.✔ ✔ D.,/.representative,/.and,/.sub-
samples,/.time,/.spaced,/.over,/.15,/.minutes,/.apart

,What,/.is,/.the,/.standard,/.volume,/.for,/.a,/.BOD,/.sample,/.bottle?

A.,/.150,/.mL
B.,/.200,/.mL
C.,/.300,/.mL

D.,/.500,/.mL,/.-,/.correct,/.answer,/.✔ ✔ c.,/.300,/.mL

If,/.you,/.have,/.a,/.lime,/.slurry,/.feed,/.line,,/.what,/.is,/.the,/.best,/.valve
,/.to,/.use?

A.,/.plug,/.valve
B.,/.butterfly,/.valve
C.,/.RPZ,/.dual,/.check,/.valve

D.,/.gate,/.valve,/.-,/.correct,/.answer,/.✔ ✔ A.,/.plug,/.valve

5.,/.If,/.you,/.notice,/.a,/.predominance,/.of,/.rotifers,/.in,/.your,/.activated
,/.sludge,/.sample,/.while,/.looking,/.at,/.it,/.under,/.a,/.microscope,,/.wha
t,/.does,/.this,/.indicate?

A.,/.healthy,/.sludge

,B.,/.young,/.sludge
C.,/.old,/.sludge

D.,/.middle,/.age,/.sludge,/.-,/.correct,/.answer,/.✔ ✔ C.,/.old,/.sludge

Calculate,/.the,/.BOD,/.using,/.the,/.given,/.information:
Initial,/.DO:,/.8.3
Final,/.DO:,/.5.9
Milliliters,/.of,/.sample,/.used:,/.2

a.,/.360,/.mg/L
b.,/.210,/.mg/L
c.,/.856,/.mg/L

d.,/.36,/.mg/L,/.-,/.correct,/.answer,/.✔ ✔ a.,/.360,/.mg/L

If,/.your,/.activated,/.sludge,/.plant,/.begins,/.to,/.nitrify,,/.what,/.conditio
ns,/.would,/.you,/.expect,/.to,/.decrease?

A.,/.settling,/.in,/.clarifiers
B.,/.chlorine,/.demand
C.,/.BOD,/.effluent

, D.,/.TSS,/.in,/.effluent,/.-,/.correct,/.answer,/.✔ ✔
a.,/.settling,/.in,/.the,/.clarifiers

How,/.do,/.you,/.calibrate,/.a,/.chemical,/.feed,/.pump?

A.,/.by,/.measuring,/.the,/.pump,/.output
B.,/.using,/.the,/.SWAG,/.method
C.,/.jar,/.test

D.,/.with,/.a,/.microscope,/.-,/.correct,/.answer,/.✔ ✔
A.,/.by,/.measuring,/.the,/.pump,/.output

What,/.is,/.the,/.chemical,/.formula,/.for,/.sulfuric,/.acid?

a.,/.HNO3
b.,/.HCl
c.,/.NaOH

d.,/.H2SO4,/.-,/.correct,/.answer,/.✔ ✔ d.,/.H2SO4

What,/.is,/.the,/.most,/.common,/.type,/.of,/.activated,/.sludge,/.package,/
.plants?

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Uploaded on: October 15, 2026
Number of pages: 52
Written in: 2026/2027
Type: Exam (elaborations)
Contains: Questions & answers

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