Q) What is the permeate flow produced by the RO array? Wastewater containing 280
ID: 1714788 • Letter: Q
Question
Q) What is the permeate flow produced by the RO array?
Wastewater containing 280 mg/L BOD with a pH of 7.9 is being pumped at a rate of 450 m^3/h via a pipe to a biological treatment.
After a biological treatment of water. The treated water then passes through 15 cylindrical sand filters operating at a pressure of 0.17 bar for the clean filter, the mean sand grain size being 700 m, and the bed porosity 32% with an aspect ratio of 0.8.
The filtered water then passes through 2 stages of reverse osmosis modules, each providing a conversion of 45%.
Finally, the water passes through a degasser to strip the CO2 from the water.
Explanation / Answer
Answer:
Permeate flow is the measure of Reverse Osmosis performance. It can also be denoted as the portion of feedwater which passes through the membrane.
"Permeate = Feedwater - Concentrate"
So in simple terms,
Feed water = 450 cum/hr.
Conversion ratio = 45%.
So, the premeate flow after 2 stages of RO modules @ 45% conversion = 450*45% = 202.5*45% = 91.125%
Terminologies:
Aspect ratio: The ratio of width to the height of the screen
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.