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a calculate the hydraulic residence times the retention time for lake superior and for lake erie using data in table
an ice rink depicted in figure 4-22 has the following conditionat the time the resurfacing machine is turned offa what
the tube in problem 4-20 is connected to a source of flowing water and water is passed through the tube at a rate of
the blades of the portable fan generate a 4-n thrust t as shown compute the moment m o of thisthe blades of the
1 a population having a biomass of 2 mgl at t 0 days reaches a biomass of 139 at t 10 days assuming exponential
question write a report on ranging but not chainage in
construction project facts provide quantity take-off relative to questionsthat certain structure measuring 100 x 150
consider a house into which radon is emitted through cracks in the base-ment the total volume of the house is 650 m3
you are in an old spy movie and have been locked into a small room volume 1000 ft3 you suddenly realize that a poison
two towns located directly across from each other operate municipal wastewater-treatment plants that are situated along
you are designing a reactor that uses chlorine in a per or cmfr to de-stroy pathogens in water a minimum contact lime
what is the most effective way to wash laboratory glassware assume that you have a 10 l flask that contains 5 ml of
the total flow at a wastewater-treatment plant is 600 m3 day-1 two bio-logical aeration basins are used to remove bod
a small lake with volume 200 x 103 m3 has no natural pollutant sources however a sewage pipe discharges sewage
for each of the following problems answer the following questions you do not need to actually solve the problemsi what
the concentration of bod an indicator of organic pollution in a river just downstream of a sewage-treatment plant
a 10 x 106 gallon reactor is used in a sewageireatment ptanttbe influent concentration is 100 mgl-1 the effluent
organic carbon c and ammonia nitrogen nh3 are oxidized to carbon dioxide co2 and nitrate no3 - respectively by
when food supplies have been exhausted populations die away this exponential decay is described by a simple
food limitation of population growth is described using the monod model population growth is characterized by the
the hydraulic gradient of groundwater in a certain location is 2 ft100 ft groundwater in this location flows through
two groundwater wells are located 100 m apart in permeable sand and gravel the water level in well 1 is 50 m below the
a settling chamber is used to remove particles from an air flow settling chamber height is 3 m and residence time of
a treatment plant has two primary clarifiers each with a depth of 5 in and with a combined volume of 5000 m3 the