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thank you, last question  Regulations of Contaminant (A) call for PPM ≤ 20 PPM Is the treatment in spec? Calculate the final concentration in units of PPM.

thank you, last question  Regulations of Contaminant (A) call for PPM ≤ 20 PPM Is the treatment in spec? Calculate the final concentration in units of PPM.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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thank you, last question 

Regulations of Contaminant (A) call for PPM ≤ 20 PPM Is the treatment in spec? Calculate the final concentration in units of PPM.

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The regulations of contaminant A call for a PPM of 20 or less. The initial concentration of contaminant A is 100 PPM and the treatment rate is 0.5 PPM/ day.

 The final concentration of contaminant A can be calculated using the following formula:

  • f i n a l space c o n c e n t r a t i o n equals i n i t i a l space c o n c e n t r a t i o n asterisk times left parenthesis 1 minus t r e a t m e n t space r a t e right parenthesis

Plugging in the values, we get:

  • f i n a l space c o n c e n t r a t i o n equals 100 space P P M space asterisk times space left parenthesis 1 minus 0.5 space P P M divided by d a y right parenthesis equals 50 space P P M

Therefore, the final concentration of contaminant A is 50 PPM. This is within a PPM of 20 or less, so the treatment is in spec.


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im sorry i dont understand, can you please re-do in a different way maybe showing units

Regulations of Contaminant (A) call for PPM less than or = to 20 PPM. is the treatment in spec? Calculate the final concentration in units of PPM.

The wastewater treatment process at a polymer plant consists of a longitudinal bio-remediation pond and a large clarifying tank. The 12-ft wide pond is constructed orthogonally (straight sides only) and has a length and a depth of 60 ft and 3.0 ft, respectively. No mixing occurs along the length of the pond. The tank is of cylindrical shape and has a diameter of 20 ft and is 40 ft high. The contents of the tank are stirred during operation. The wastewater stream is pumped into the pond first before flowing to the tank. The effluent (outlet) of the tank is pumped to a lake nearby the plant. Assume that both the pond and the tank operate at 'steady-state' since the fluid levels of the pond and the tank remain constant during normal operations of the plant. The stream is mostly water and contains a contaminant "A", whose concentration must decreased following legal standards for chemical releases. Both the pond and the tank contain different bio- remedial agents that consume contaminant "A" at different rates. The following data are provided for this treatment process: vo = CAO = MWA = Rate in pond: k in pond: Rate in tank: k in tank: 1000 ft³ of water/hr 0.2 lbmol/(ft³ of water) 72 lbm/lbmole -₁,A = k₁ C² k₁= 200 ft³/(lbmol * day) -12,₁A = K₂ CA k₂ = 100 day-¹
Transcribed Image Text:The wastewater treatment process at a polymer plant consists of a longitudinal bio-remediation pond and a large clarifying tank. The 12-ft wide pond is constructed orthogonally (straight sides only) and has a length and a depth of 60 ft and 3.0 ft, respectively. No mixing occurs along the length of the pond. The tank is of cylindrical shape and has a diameter of 20 ft and is 40 ft high. The contents of the tank are stirred during operation. The wastewater stream is pumped into the pond first before flowing to the tank. The effluent (outlet) of the tank is pumped to a lake nearby the plant. Assume that both the pond and the tank operate at 'steady-state' since the fluid levels of the pond and the tank remain constant during normal operations of the plant. The stream is mostly water and contains a contaminant "A", whose concentration must decreased following legal standards for chemical releases. Both the pond and the tank contain different bio- remedial agents that consume contaminant "A" at different rates. The following data are provided for this treatment process: vo = CAO = MWA = Rate in pond: k in pond: Rate in tank: k in tank: 1000 ft³ of water/hr 0.2 lbmol/(ft³ of water) 72 lbm/lbmole -₁,A = k₁ C² k₁= 200 ft³/(lbmol * day) -12,₁A = K₂ CA k₂ = 100 day-¹
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