Problem Solved: MCRT Problem - Wastewater Math

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The problem reads:
At an activated sludge wastewater treatment plant receiving 3.25 MGD, the final effluent
suspended solids concentration averages 21.2 mg/L. What would the calculated MCRT
value be when the aeration basin carries 2050 mg/L MLSS and wastes 0.0550 MGD. The
waste activated sludge has a concentration of 7980 mg/L. The aeration tank has a volume
of 1.00 MG and the secondary clarifier has an operational volume of 0.250 MG.
a. 2.5 days
b. 5.0 days
c. 7.5 days
d. 15 days
e. 42 days

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Комментарии
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You're a good man and people should tell you that every day

redmimic
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The clarifier plays no useful part in the MCRT calculation. The purpose of the calculation is to confirm the solids residence time is adequate for the target removal efficiency of BOD and nutrients to be achieved. The BOD and nutrient reduction takes place in the aerobic portion of the process (the aeration tank) and thus the clarifier plays no part.

zzytrewq
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Dear SIr,
Plese help me out i want to know
1.how to generate MLSS in waste water treatment plant my technology is SBR technology.
2. How to reduce foam.

dalvisamiya
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Gosh, that is lovely.
What does it tell you?
It tells me the MLSS is too low.
The RAS is High so its settling like a rock leaving a LOT behind, a little old maybe? Ya THINK!
How's your foam on the basin? Thick dark and gummy?
What's your DO uptake at the center well of your final clarifier? That high? hmm!
What's your DO across the basin? 2.0? 1.5 Oh, are you trying to run at 1.0???
It is loosing 575 pounds a day in uncontrolled wasting and the EPA is probably breathing down their back over that TSS.
What is the detention time across the Basin? Offhand (with no math and no calculator and no black board) I would say the basin is a mite small for the project.
I bet the digester is pretty. Adjust the budget for about double the sludge removal.
At this point doing a bunch of math to prove what they need is an OPERATOR is pointless.

gmwwc
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Since you're multiplying by 8.34 on top and in both parts of the bottom, can't you just ignore the gallons to pounds conversion entirely?

bearloscuro
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What this plant NEEDS is to quit un planned wasting of 575 pounds of mlss per day. I bet their digester is a pretty sight!

gmwwc
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Jesus, that plant is very troubled!!!

gmwwc