Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 4, Problem 4.17P
To determine
Grate spacing and horsepower required by the shredder
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If the BOD3 of a waste is 75 mg/L and the K is 0.150 d^-1
, what is the ultimate BOD? (Report your
answer to two significant figures).
Assume that a material recovery facility has a conveyor belt (manual sorting unit) measuring 1,0 m width and an average belt speed of 18 m/min. Waste loading rate of the system is 12000 kg per hour and the average density of the waste on the conveyor belt is 80 kg/m3. Calculate the thickness of the waste on the conveyor belt and comment about this thickness.
If the BOD4 of a waste is 200.0 mg/L and the ultimate BOD is 270.0 mg/L, what is the
rate constant at 10⁰C.
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- Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10 tons/h A and 4 tons/h B. The split (fraction of material rejected by each operation) is given in Table P5-14. a. Which sequence of operations, (l?2) or (2?1), will yield the greatest recovery of material A? b. What will be the purity of material A using that sequence? c. What will be the efficiency of separation for the entire process train with regard to material A using the Worrell-Stesed equation?arrow_forwardDescribe how the moisture content of waste is determined.? Define the term; Waste to energy.arrow_forwardIf the BOD3 of waste is 75 mg/L and the K is 0.150 d-1 , what is the ultimate BOD?arrow_forward
- what are typical values of BOD removal in wasteqater plants?arrow_forwardBriefly describe how the moisture content of waste is determined.arrow_forwardAn aggregate sample was collected in a container and weighed as 528.7 g. The sample was oven dried and theoven dry weight was measured as 506.4 g. If the empty weight of the container was 79.6 g, determine the MC of theaggregatesarrow_forward
- Calculate the ultimate BOD of a waste if its BOD5 is 100 mg/L and the K is 0.130 d-1arrow_forwardAgitate the sieves by hand or by mechanical apparatus for a sufficient period. The criterion for sieving time is that, after completion, not more than 1% of the residue on any individual sieve will pass that sieve during 1 minute of continuous hand sieving.arrow_forwardIf the BOD4 of a waste is 135 mg/L and K is 0.075 day^-1, the 5-day BOD (BOD5) and ultimate BOD (BODu or L0) of this waste are nearly? Use equations K = (2.303)K relationship, if necessary.arrow_forward
- An air classifier is applied to separate a mixture of four solid waste components shown in Figure 5-20 above. All four components have equal mass.a) Determine the mass composition in percent of the four components in theoverflow (extract) if the air classifier is operated at an air velocity of 1,000 ft/min.b) Determine the mass composition in percent of the four components in theoverflow (extract) if the air classifier is operated at an air velocity of 2,000 ft/minarrow_forwardRead the question carefully and Give me right solution. The fractional collection efficiencies with weight distribution in the given particle size range. ranges are given below for collector, in percent: device A, 10-20 micron-40 percent, 20-30 micron - 64 percent, 30-40 micron - 72 percent, 40-50 micron- 80 percent, and 50-80 micron - 92percent. Determine the overall collection efficiency based on mass for device A.arrow_forwardA waste has an ultimate BOD of 1,000 mg/L and a kL of 0.1/day. What is its 5-day BOD?arrow_forward
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Solid Waste EngineeringCivil EngineeringISBN:9781305635203Author:Worrell, William A.Publisher:Cengage Learning,
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Civil Engineering
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Cengage Learning,