Indiana Class B Wastewater
Operator Study Guide |
Certification Training, Practice
Questions & Exam Prep
2026/2027
, Water Velocity: Preliminary Treatment at Bar Screen 2-4 ft/s
POTW Publicly Owned Treatment Works
Step 1 of Preliminary Treatment Bar Screen
Bar Screen Width 1/4"
Two (2) Types of Bar Screens Manual, Automatic
Hydraulic Jump Increase in water level upstream of a flow restriction.
Head Loss Decrease in water level downstream of a flow restriction.
Communitor A slotted cylinder with blades inside that cuts solids.
Masserator Counter rotating gears that grinds solids between them.
Barmunator A device that pulls bars with protruding teeth to break up solids.
Grit/Detritus Chamber Flow reduced to 1-2 ft/s to allow grit to settle to the bottom.
Grit Any solid that normally won't burn, isn't water soluble, and has no nutrient value.
Two (2) Types of Grit Chambers Aerated, Non-Aerated
Aerated Grit Chamber Adds dissolved oxygen to the wastewater, causing organics to float and grit to sink.
Flow Meter A device used to measure flow rate.
Operator Study Guide |
Certification Training, Practice
Questions & Exam Prep
2026/2027
, Water Velocity: Preliminary Treatment at Bar Screen 2-4 ft/s
POTW Publicly Owned Treatment Works
Step 1 of Preliminary Treatment Bar Screen
Bar Screen Width 1/4"
Two (2) Types of Bar Screens Manual, Automatic
Hydraulic Jump Increase in water level upstream of a flow restriction.
Head Loss Decrease in water level downstream of a flow restriction.
Communitor A slotted cylinder with blades inside that cuts solids.
Masserator Counter rotating gears that grinds solids between them.
Barmunator A device that pulls bars with protruding teeth to break up solids.
Grit/Detritus Chamber Flow reduced to 1-2 ft/s to allow grit to settle to the bottom.
Grit Any solid that normally won't burn, isn't water soluble, and has no nutrient value.
Two (2) Types of Grit Chambers Aerated, Non-Aerated
Aerated Grit Chamber Adds dissolved oxygen to the wastewater, causing organics to float and grit to sink.
Flow Meter A device used to measure flow rate.
