3.1 In order to soften 6 MGD of water contains Ca²= 120 mg/L and Mg²+ = 95 mg/L, to the practicalsolubility limit using split treatment and with desired magnesium concentration of 40 mg/L as CaCO3.we need to treat only: a) 5.5 MGDb) 4.5 MGDc) 3.2 MGDd) 4.9 MGDContinue in the back3.2 If an ion exchange water softener has 0.2 m' of ion-exchange resin with an exchange capacity of 75kg/m³. The occupants use 2500 gallon/day of water. If the water contains 250 mg/L of hardness asCaCO, and it is desired to soften it to 90 mg/L as CaCO), what is the time between regeneration?a) 15 daysb) 14 daysc) 12 daysd) 10 days3.3 You are about to design a sand filter that has sand with a particle diameter of 0.02 inch. Duringfiltration, the depth of the filter is 0.75 ft and the porosity is 0.25. During backwash, the porosity isexpected to be 0.60. If gravel and underdrain layer is 1.6 ft and free board is 2 ft, the total depth of thefilter will be: a) 3.5 ftb) 5.0 ftc) 8.5 ftd) 9.5 ft3.4 A cube flash mixer has a dimension of 6 ft, and an average water temperature of 70°F. If theminimum velocity gradient according to the (10 states 4.2.2.a) is at least 750 fps/ft, the power neededfor imparting a minimum velocity gradient is:a) 3568 ft.Ib/secb) 2925 ft.Ib/secc) 4576 ft.Ib/secd) 2490ft.Ib/sec3.5 A city with a population of about 20,000 needs a new solid waste collection truck(s). You been askedto determine the number of the vehicles needed to serve the population. The capacity of the vehicleavailable for purchase is 25 yd' and can make 3 trips per day, 6 days per week and will compact thewaste to 550 lb/yd'. If the generation rate from studies in this community is 4 Ib/d for each person,how many trucks you need? a) 3 trucks b) 4 trucks c) 5 trucks d) 6 trucks3.6 A plant treat drinking water from a suspended solids of 110 mg/L to 20 mg/L using 42 mg/L of alumdosage. What is the total mass rate of sludge generated in mg/L? (Assume alum EW is 100 mg/meq,and 26 mg/meq for Al(OH)3). a) 96 mg/L b) 101 mg/L c) 135 mg/L d) 159 mg/L3.7 A plant has an average flow rate of 0.5 MGD. It has 3 settling basins operated in parallel with 2online at any one time. The effective dimensions (for settling) of the basins are 30 ft long by 20 ftwide by 12 ft deep. The plant's hydraulic retention time is around:a) 5.9 hoursb) 6.5 hoursc) 4.3 hoursd) 5.2 hours3.8 If filter dimensions are 30ft by 25ft, how much backwash water in gallons is required if the processtakes only 20 minutes and assuming backwash rate used is 20 gpm/ft²?a) 400000 gallon b) 350000 gallonc) 300000 gallond) 250000 gallon3.9 A 20-MGD water treatment plant uses 5 parallel rapid sand filters (4 of them online at any time). Ifeach filter dimensions are 30ft by 25ft, what is the filtration rate in gpm/ft²?a) 5.9 gpm/ft²b) 15.8 gpm/ft²c) 12.9 gpm/ft²d) 4.63 gpm/ft²3.10 A 2.0 ft/sec water to be treated using membrane ultra-filtration. The available membrane has aporosity of 55%, a pore size of 7.0x10 inch and a thickness of 4.0x 10 inch. The water has aviscosity of 2.34x10" Ib.sec/ft². If 1.5 psi pressure drop is expected during filtration, what would bethe area of the membrane you recommend? a) 15 ft² b) 20 ft² c) 28 ft² d) 31 ft²

3.2 If an ion exchange water softener has 0.2 m' of ion-exchange resin with an exchange capacity of 75 kg/m³. The occupants use 2500 gallon/day of water. If the water contains 250 mg/L of hardness as CaCO, and it is desired to soften it to 90 mg/L as CaCO), what is the time between regeneration? a) 15 days b) 14 days c) 12 days d) 10 days

3.2 If an ion exchange water softener has 0.2 m' of ion-exchange resin with an exchange capacity of 75 kg/m³. The occupants use 2500 gallon/day of water. If the water contains 250 mg/L of hardness as CaCO, and it is desired to soften it to 90 mg/L as CaCO), what is the time between regeneration? a) 15 days b) 14 days c) 12 days d) 10 days

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Integrated Solid Waste Management

Integrated Solid Waste Management (ISWM) is a thorough waste suppression, compost, removal and recycling Program. An effective ISWM system considers how to suppress, manage and recycle solid waste in a manner that is most efficiently to protect human health and the surrounding. ISWM system requires evaluation of public wants and demands and then selecting and merging the most effective waste management activities for the proposed demands. The main ISWM activities for solid waste management are Waste prevention, Recycling and Composting, and Combustion and Removal and waste collection in a properly planned, constructed, managed and mitigated landfill areas. Each of these requires careful designing, financing, accumulation, and delivery of activities.

Question

3.1 In order to soften 6 MGD of water contains Ca²= 120 mg/L and Mg²+ = 95 mg/L, to the practical
solubility limit using split treatment and with desired magnesium concentration of 40 mg/L as CaCO3.
we need to treat only: a) 5.5 MGD
b) 4.5 MGD
c) 3.2 MGD
d) 4.9 MGD
Continue in the back
3.2 If an ion exchange water softener has 0.2 m' of ion-exchange resin with an exchange capacity of 75
kg/m³. The occupants use 2500 gallon/day of water. If the water contains 250 mg/L of hardness as
CaCO, and it is desired to soften it to 90 mg/L as CaCO), what is the time between regeneration?
a) 15 days
b) 14 days
c) 12 days
d) 10 days
3.3 You are about to design a sand filter that has sand with a particle diameter of 0.02 inch. During
filtration, the depth of the filter is 0.75 ft and the porosity is 0.25. During backwash, the porosity is
expected to be 0.60. If gravel and underdrain layer is 1.6 ft and free board is 2 ft, the total depth of the
filter will be: a) 3.5 ft
b) 5.0 ft
c) 8.5 ft
d) 9.5 ft
3.4 A cube flash mixer has a dimension of 6 ft, and an average water temperature of 70°F. If the
minimum velocity gradient according to the (10 states 4.2.2.a) is at least 750 fps/ft, the power needed
for imparting a minimum velocity gradient is:
a) 3568 ft.Ib/sec
b) 2925 ft.Ib/sec
c) 4576 ft.Ib/sec
d) 2490ft.Ib/sec
3.5 A city with a population of about 20,000 needs a new solid waste collection truck(s). You been asked
to determine the number of the vehicles needed to serve the population. The capacity of the vehicle
available for purchase is 25 yd' and can make 3 trips per day, 6 days per week and will compact the
waste to 550 lb/yd'. If the generation rate from studies in this community is 4 Ib/d for each person,
how many trucks you need? a) 3 trucks b) 4 trucks c) 5 trucks d) 6 trucks
3.6 A plant treat drinking water from a suspended solids of 110 mg/L to 20 mg/L using 42 mg/L of alum
dosage. What is the total mass rate of sludge generated in mg/L? (Assume alum EW is 100 mg/meq,
and 26 mg/meq for Al(OH)3). a) 96 mg/L b) 101 mg/L c) 135 mg/L d) 159 mg/L
3.7 A plant has an average flow rate of 0.5 MGD. It has 3 settling basins operated in parallel with 2
online at any one time. The effective dimensions (for settling) of the basins are 30 ft long by 20 ft
wide by 12 ft deep. The plant's hydraulic retention time is around:
a) 5.9 hours
b) 6.5 hours
c) 4.3 hours
d) 5.2 hours
3.8 If filter dimensions are 30ft by 25ft, how much backwash water in gallons is required if the process
takes only 20 minutes and assuming backwash rate used is 20 gpm/ft²?
a) 400000 gallon b) 350000 gallon
c) 300000 gallon
d) 250000 gallon
3.9 A 20-MGD water treatment plant uses 5 parallel rapid sand filters (4 of them online at any time). If
each filter dimensions are 30ft by 25ft, what is the filtration rate in gpm/ft²?
a) 5.9 gpm/ft²
b) 15.8 gpm/ft²
c) 12.9 gpm/ft²
d) 4.63 gpm/ft²
3.10 A 2.0 ft/sec water to be treated using membrane ultra-filtration. The available membrane has a
porosity of 55%, a pore size of 7.0x10 inch and a thickness of 4.0x 10 inch. The water has a
viscosity of 2.34x10" Ib.sec/ft². If 1.5 psi pressure drop is expected during filtration, what would be
the area of the membrane you recommend? a) 15 ft² b) 20 ft² c) 28 ft² d) 31 ft²

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