Wastewater Collections 2 Study Guide – Practice Questions & Answers
Wastewater
PDF Collections 2 Study Guide – Practice Questions & Answers PDF.pdf 2026-03-10
Wastewater Collections 2
Study Guide – Practice
Questions & Answers PDF
Page 1 of 5Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_Page 1 Wastewater Collections 2 Study Guide – Practice Questions & Answers PDF.pdf
, wastewater collections 2 study guide wastewater collections 2 study guide.pdf 2026-03-10
Why should the pumps in a lift station not start and stop frequently?
Pump in a lift station should not start and stop frequently because frequent motor starts cause excessive wear
on equipment and may cause surges in the Wastewater flow. Also, frequent starting will increase power cost.
What problems develop in a wet well that is too large?
If a wet well is too large, solids will tend to accumulate on the bottom because the wet well will be acting as a
settling tank, accumulated solids could block the pump suction pipes and over a period of time, can generate
dangerous gases and odors.
3. What is the main advantage of variable-speed pumping equipment?
The main advantage of variable speed pumping equipment is that the pumping speed can be adjusted to match
the capacity or the flow rate into the wet well.
4. In collection systems, why have bar racks or screens at the list stations been eliminated by some agencies?
They have been removed because most pumping units are equipped with open impellers or closed two-port
impellers sized to pass solids up to the size of a 2.5 inch diameter sphere and it also eliminates the necessity to
visit the lift station more than once a day.
Page 2 of 5 Page 2 wastewater collections 2 study guide.pdf
Wastewater
PDF Collections 2 Study Guide – Practice Questions & Answers PDF.pdf 2026-03-10
Wastewater Collections 2
Study Guide – Practice
Questions & Answers PDF
Page 1 of 5Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_Page 1 Wastewater Collections 2 Study Guide – Practice Questions & Answers PDF.pdf
, wastewater collections 2 study guide wastewater collections 2 study guide.pdf 2026-03-10
Why should the pumps in a lift station not start and stop frequently?
Pump in a lift station should not start and stop frequently because frequent motor starts cause excessive wear
on equipment and may cause surges in the Wastewater flow. Also, frequent starting will increase power cost.
What problems develop in a wet well that is too large?
If a wet well is too large, solids will tend to accumulate on the bottom because the wet well will be acting as a
settling tank, accumulated solids could block the pump suction pipes and over a period of time, can generate
dangerous gases and odors.
3. What is the main advantage of variable-speed pumping equipment?
The main advantage of variable speed pumping equipment is that the pumping speed can be adjusted to match
the capacity or the flow rate into the wet well.
4. In collection systems, why have bar racks or screens at the list stations been eliminated by some agencies?
They have been removed because most pumping units are equipped with open impellers or closed two-port
impellers sized to pass solids up to the size of a 2.5 inch diameter sphere and it also eliminates the necessity to
visit the lift station more than once a day.
Page 2 of 5 Page 2 wastewater collections 2 study guide.pdf
