Lift stations and pumps - Study guides, Class notes & Summaries

When are lift stations required? - move wastewater from low to high elevation - gravity sewer must service lower area - trench depth becomes excessive - WWTP is hydraulicly uphill - life is from one gravity system to another - moving from gravity to pressure system What do lift stations require? - being super reliable - high quality equipment - standby power supply - minimum two pumps at Qmax capacity What are the two types of lift stations? - dry well -wet well ...

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...

CWEA Operation and Maintenance of Wastewater Collection System Volume II Questions And Correct Answers Lift station. What is the most important requirement of a lift station? - ANSWER 1. Economics . 2. Operation and maintenance. 3. Reliability. 4. Safety. Why should the design of a lift station take into consideration any humid atmosphere in the station? - ANSWER 1. To avoid making operators sweat profusely. 2. To keep moisture from hindering light passing through the window. 3. To...

When should atmospheric monitoring in a confined space be performed? Correct Answer Continuously from pre-entry to exit Below what maximum percentage is an atmosphere considered oxygen deficient? Correct Answer 19.5% Which type of pipe is recommended when crossing another underground utility? Correct Answer Ductile Iron pipe Which chemical may be used to remove sulfides by precipitation? Correct Answer Ferric Chloride (FeCl3) What is a Hydro-brake? Correct Answer A vortex flow regula...

What test indicates the efficiency of a trickling filter? - Answer Percent BOD removal The temperature in an anaerobic digester should NOT change more than? - Answer 1°C per day What does a short circuiting in a WW pond cause? - Answer Decreases detention time What way does a bell spigot go? - Answer Upgrade/upstream or uphill What is the proper PH level for a aerobic digester? - Answer 6.8 to 7.4 What is the most important micro-organism in WW treatment? - Answer Bac...

Rise Is the vertical distance from the deck to the overhead to the point where the stores are to meet William Classifications services vital piping and ventilation systems these are not required to be closed when setting any material condition of readiness. is not closed during GQ Bucket Patch effective for use over holes that have jagged edges, A patch usually covers holes with metal protruding inwards, has a folding 7" and 'T' bolt and does not require shoring Bulls...

Lift station. What is the most important requirement of a lift station? - Answer- 1. Economics . 2. Operation and maintenance. 3. Reliability. 4. Safety. Why should the design of a lift station take into consideration any humid atmosphere in the station? - Answer- 1. To avoid making operators sweat profusely. 2. To keep moisture from hindering light passing through the window. 3. To minimize corrosion damage. 4. To prevent the need to remove water condensation from the humidity. What...

In the activated sludge plants, the operator will experience problems. Some of the common Operational problems include - a. Sludge quality, Foaming, Improper operating techniques b. Sludge consistency, Mechanical failures, Microorganisms die off c. Odors, Foaming, Operators not understanding lab analysis or how to correct deficiencies d. Recycling pumps and lines are typically undersized causing septic sludge, foaming, Operator training & Understanding of the plant e. Both a & d a. Sludge ...

Basic Wastewater D Exam Questions and Complete Solutions 1. Water resources in Texas include lakes, rivers, bays, estuaries, wetlands, groundwater, and stormwater runoff. a. true b. false - Answer: b 2. Water pollutants include organic and inorganic material, heat, and radiation. a. true b. false - Answer: a 3. In Texas, clean water is needed to provide for human consumption and recreation, maintain aquatic habitats for wildlife, supply bays with fresh water, recharge gr...

ater Distribution Questions and Answers with Verified Solutions The term aquifer refers to? Water bearing strata The use of a well supply as a source normally results in? Water of consistent quality Maximum Safe Yield of a water source is? The quantity of water that can be taken from a source of supply over a period of years without depleting the source permanently Movement of water through the ground is called? Percolation The inlet into a pump is generally called? Suction The rotating ele...