WV CLASS 2 WASTE WATER EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
Rules - ANS * a class 2 plant must have a class 2 operator on call 24 hours per day 7 days a
week.
*a class 2 plant must have one certified operator in addition to the chief operator
* a class 2 plant must have a class 2 on site 40 hours per week
*Form Es-53 for certification
*renewal every 2 years with proof of 12 cehs using form EW-212 30 to 60 days prior to
expiration
*exam grade is good for 2 years
* experience from non-operational jobs can only count for 600 hours toward certification
* class 2 plant will have flows of more than 1 mgd but less than or equal to 1.75 MGD
*it is up to the chief operator to applg for an OIT certification for a new hire. the owner should
be able to depend on ghe chief operator to do this.
Trickling filters - ANS *secondary treatment process
*removes more than 90% of TSS
3 most common secondary treatment processes - ANS *RBC's
@2026/2027 ALLRIGHTS RESERVED.
,*Activated sludge
*trickling filters
basic trickling filter parts - ANS *media or the retaining structure
*underdrain system
*distribution system
what does media do? - ANS provides an area for the biological slime growth develops
media requirements - ANS *filter MUST stay aerobic
*Rock size ISN'T very important but the rock should be uniform in size for adequate ventilation
*depth 3'-8' rock media
*15'-30' synthetic media
what is media made of? - ANS *Rock, Slag, Coal, Brick, redwood blocks, molded plastic.
what is one of the worst problems with a trickling filter? - ANS the deterioration of the
media &' the cost burden it puts on the owner
What are voids for? - ANS ventilation
What do void spaces in the filter media allow? - ANS Ventilation
What can cause ponding ? - ANS When voids get clogged
@2026/2027 ALLRIGHTS RESERVED.
, What is the best operational control of a trickling filter? - ANS recirculation
which recirculation rate will render good results? - ANS the lowest
what do lower recirculation rates do? - ANS save energy and cost
What are Rbc's? - ANS a suspended growth system
for nutrient removal what density media would you need? - ANS High Density Media
what do RBC's with more effective use of the media have ? - ANS A uniform growth
Disadvantages of RBC's compared to trickling filters? - ANS *no recirculation, which isn't
needed but sometimes could improve treatment, and more sensitive to industrial waste if they
entered the system.
Disinfection - ANS * the use of pipe lines in the contact chamber are very effective
*feeding chlorine is usually a lot more effective if the diffuser is at the inlet end
if the gas chlorine is too low what is it usually caused by? - ANS a dirty strainer
what do organisms compete with each other for? - ANS food
an increase in organisms will require what? - ANS more oxygen
@2026/2027 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS 2026
VERIFIED.
Rules - ANS * a class 2 plant must have a class 2 operator on call 24 hours per day 7 days a
week.
*a class 2 plant must have one certified operator in addition to the chief operator
* a class 2 plant must have a class 2 on site 40 hours per week
*Form Es-53 for certification
*renewal every 2 years with proof of 12 cehs using form EW-212 30 to 60 days prior to
expiration
*exam grade is good for 2 years
* experience from non-operational jobs can only count for 600 hours toward certification
* class 2 plant will have flows of more than 1 mgd but less than or equal to 1.75 MGD
*it is up to the chief operator to applg for an OIT certification for a new hire. the owner should
be able to depend on ghe chief operator to do this.
Trickling filters - ANS *secondary treatment process
*removes more than 90% of TSS
3 most common secondary treatment processes - ANS *RBC's
@2026/2027 ALLRIGHTS RESERVED.
,*Activated sludge
*trickling filters
basic trickling filter parts - ANS *media or the retaining structure
*underdrain system
*distribution system
what does media do? - ANS provides an area for the biological slime growth develops
media requirements - ANS *filter MUST stay aerobic
*Rock size ISN'T very important but the rock should be uniform in size for adequate ventilation
*depth 3'-8' rock media
*15'-30' synthetic media
what is media made of? - ANS *Rock, Slag, Coal, Brick, redwood blocks, molded plastic.
what is one of the worst problems with a trickling filter? - ANS the deterioration of the
media &' the cost burden it puts on the owner
What are voids for? - ANS ventilation
What do void spaces in the filter media allow? - ANS Ventilation
What can cause ponding ? - ANS When voids get clogged
@2026/2027 ALLRIGHTS RESERVED.
, What is the best operational control of a trickling filter? - ANS recirculation
which recirculation rate will render good results? - ANS the lowest
what do lower recirculation rates do? - ANS save energy and cost
What are Rbc's? - ANS a suspended growth system
for nutrient removal what density media would you need? - ANS High Density Media
what do RBC's with more effective use of the media have ? - ANS A uniform growth
Disadvantages of RBC's compared to trickling filters? - ANS *no recirculation, which isn't
needed but sometimes could improve treatment, and more sensitive to industrial waste if they
entered the system.
Disinfection - ANS * the use of pipe lines in the contact chamber are very effective
*feeding chlorine is usually a lot more effective if the diffuser is at the inlet end
if the gas chlorine is too low what is it usually caused by? - ANS a dirty strainer
what do organisms compete with each other for? - ANS food
an increase in organisms will require what? - ANS more oxygen
@2026/2027 ALLRIGHTS RESERVED.
