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62 Cards in this Set
- Front
- Back
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what treatment unit in a waste water treatment plant are designed and operated to remove sludge?
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Primary treatment units
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what are aerobic bactieria?
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bactieria needs oxygen to survive and thrive
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what is ph?
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an expression of how basic or acidic a solution is ranging from 0-14.
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what is the purpose of primary treatment?
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to remove settaleable and floatable material.
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what is the most common wastewater flow measuring device?
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the Parshall Flume
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why must some organisms be removed from from the activated sludge process?
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to prevent the number of organisms from becoming too great.
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what is the purpose of pre airation?
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to freshen the wastewater and separete the grease and oil.
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why does grit settle out better in an airater chamber.
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because the mixture of air and water has a lower spacific gravity than water.
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what is the purpose of a rectangular sedimentation basin scum trough?
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to recieve the floating matierial from the scum skimmer.
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why must hair, oil and fats and other light matierial be removed by flotation.
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to protect the astetics (appearance) of the receiving waters.
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what is the name for biological slime growth that develops on the trickling filter media?
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zoogleal film
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what do high settalable solidsin the trickleing filter plant effluent mean?
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that solids are being carried over the weir.
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what are the media used by rotating biological contractors(rbc)?
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plastic discs
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what are faculative bactieria?
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bactieria that can use either dissolved oxygen or oxygen derrived from food matierials such as sulfate nitrate ions.
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how can foaming be controlled in an aeration tank?
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by water sprays.
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how are inorganic solids such as sand ,silt and cinders removed in the oxidation ditch process.
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by capture in the oxidation ditch.
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what is supernant?
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liquid removed from settled sludge.
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what could be the cause of a rotating biological contactor media appear black and producing odors that ar'nt normal.
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solids or BOD overload
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what should be provided at flow equilization facilities in the plans and specifacations in package plants.
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specifacations to handle high flows
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what can you find with this formula: flow gpd/area of tank in sq ft
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surface loading rate & gallons per day in sq ft
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what can you find with this formula:flow gpd/length of weir in ft
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weir overflow rate
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what can you find with this formula: weight / sample volume in ml x 1,000,000
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concentration
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what can you find with this formula:lbs/ppm x 8.34
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million gallons per day
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(f - 32) x .555 finds what?
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centigrade or celcius
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(c x 1.8) + 32 finds what?
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fahrenheit
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1 gallon of water equels
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8.34 lbs
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how many persons do we assume live in a single family home?
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3.5
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what can you find with this:(in - out)/ in X 100
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romoval rate & efficiency %
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fhat formula : part / whole x 100
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percent%
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.785 x Diameter x height and feet
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volume of a cylinder
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what formula? :lbs of mlss in aeraton basin/lbs of aeration basin influent ssper day
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sludge age
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what formula? brake hp/ motor efficientcy
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motor horsepower
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what formula? (aertion basin mg + clairifyer) x mlsss x 8.34 / suspended solds wastes x activated sludge) +plant receiving flow x suspended solids x 8.34
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MCRT= Mean Cell Residence Time
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what formula? detintion time in hrs
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volume in gallons x 24 / flow gpd
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what formula is Brake horse power
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gpm x total dynamic head x spcific gravity / 3960 x pump efficiency
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what formula is F/M food to microrganism ratio
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lbs. BOD entering aeration basin per day / lbs mlvss in aeration basin.
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what happens to sludge that settles to the bottom of the pond
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decomposed by bactieria
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what is an aerobic pond
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a pond that has dissolved oxygen distributed though it all the time
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what do acid producing bactieria do?
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they convert organic matter to volitile acids.
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what is free chlorine?
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chlorine in a liquid or gasious form.
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what can happen if scum is allowed to accumulate on the surface of a pond?
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the scum on top of the pond will cut off sunlight to the pond and odor problems can result
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what is the reason that a pond will turn grey , dull or colorless?
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ph and dissolved oxygen have dropped too low
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how should liquid chlorine tanks be checked?
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by useing gas because of leaking poteintal
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what is dechhlorination
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the removal of chlorine from tratment plant effluents.
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what is a ballast?
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a type of transfomer used to limit the current of uv lamps
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what maintinace should be done on uv systems?
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cleaning of the quarts sleeve and changing of the lamps.
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why was the pretreatment facility program designed?
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to prevent toxic wastewaters from causing treatment plants to violate the NPDES discharge requirements.
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what formula is solids loading?
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solids applied / surface area
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find the formula for flow in mgd.
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flow x 60min in hr x 24 hr/ 1,000,000
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find the formula for flow gpm or gallons per minute.
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flow x 1,000,000/60min x 24
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why is the sludge activated?
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The particles in the sludge are teeming with bacteria, fungi and protoza.
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The activated sludge process is a process that uses
________________ to speed up composition. |
microorganisms
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The activated sludge process is what kind of treatment?
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a biological treatment process.
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what is the purpose of tha activated sludge process?
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Removes suspended and dissolved solids and in the wastewater.
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What is stableized waste?
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Waste that has been treated or decomposed to the extent of not causing a nucinse or odors into receiving water.
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Why is air added to the airation tank?
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to poduce oxygen( supplied from air ) is needed by the living organisms as they oxidize wastes to obtain energy.
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What happens to the air requirement in the airation tank when the strength ( BOD) of the incoming waste water increases?
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The air requirement ( oxygen )increases in the airation tank.
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What factors could cause an unsuitible environment for the activated sludge process in an aerator tank?
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Failure to supply enough oxygen.
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What kind of chemical is used for chemical oxidation in most plants?
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chlorine
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Generally the longer the detention time.........
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the greater solids removal
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What shape are clarifiers?
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rectangular
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What percentage ofsuspended solids settle out or float after being detained for 1.5 to 2 hrs in the primary clairifyer?
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60%
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