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32 Cards in this Set
- Front
- Back
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What processes are used in WWT to reduce the volune of sludge?
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Thickening, conditioning, and dewartering
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What is majoy disadvantage of solar lagoons?
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Weather
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How is water drained from solar lagoons?
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Water is skimmed off the surface and evaproation by the sun
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What is the min. number of solar lagoons needed?
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3
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sand drying beds are designed similaty to what oter process?
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gravity sand filters
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What is considered an advantage of using centrifuges to dewater sludge?
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sluge thickness can be varied
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The shaft of a centrifuge is spinnin backward. What is the problem?
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Check valve falure
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What is considered an disadvantage of using centrifuges?
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High energy demand
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Which chemical coagulant produced a denser sludge that is easy to dewater?
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polymers
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What can happen to an empty in-ground tank if the ground water lvl high
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tank can pop out of the ground or float
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How are sedimentation and sludge thickening tanks configured to aid in sludge removal?
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floor sloped toward the center ( circular tanks)
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What is an advantage of the belt filter press?
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low energy usage, ease of operation
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What the the 2 primaty mechanisms used to separate sludge and ww by a filter press?
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Gravity drainage and pressure dewatering
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What are the 3 zones of a belt filter press?
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horiontal, vertical, and dewatering zones
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how do filer prosses dewarter sludge?
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pressure plates
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When dewatering sludge with vacuum filter, What action is needed when alum treated sludge is used?
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precoat belt with diatomaceous earth
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What is disadvantage of using alum as a coagulant?
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alum sludge hardens soil
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what is the operation rotational speed of belt presses
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as slow as possible
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that is supernatant from a centrifuge called?
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centrate
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How meny ones are there in a sedimentation tank?
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4
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What are the 4 zones in a sedimentation tank?
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inlet, outlet, sedimentation/settling, and sludge
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What is not part of a comminutor?
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platform
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The distance form the water surface lvl to the top of the tank is called?
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freeboard
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What valve is used on sludge lines because of the difficulty to clog?
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plug valve
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What valve is used to stop and start flows?
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gate valve
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What type of gate valve is used when the valve is used when the valve is burried?
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Non-rising valve
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What should you do efore starting a newly installed pump/motor?
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lubricate and check shaft operation
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In a plug valve what does the disc refur to?
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Plug
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what is purpose of stuffing box?
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to keep air from being drawn in
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Before working on a bar screen, what action is needed?
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lockout and tag
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which of the following is likely cause of a centrifuge shaft running backwards?
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bad check valve
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If 2 or more same sized pumps are installed for the same purpose, how should they e operated?
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alternately
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