A conventional activated-sludge plant treats 10.0 MGD of municipal wastewater with a BOD concentration of 240...
50.1K
Verified Solution
Link Copied!
Question
Physics
A conventional activated-sludge plant treats 10.0 MGD ofmunicipal wastewater with a BOD concentration of 240 mg/l andsuspended solids of 200 mg/l. The sludge flow pattern is shown inFigure 11-1 of the textbook with a gravity belt thickener toconcentrate the excess activated sludge. Primary and thickenedactivated sludge are pumped separately to the anaerobic digester.The primary clarifier removes 50% of the suspended solids and 35%of the BOD. The primary sludge solids content is 4.0%. Theoperating F/M ratio for the activated-sludge process is 0.3 lb BODper day per pound of MLSS. The solids content of the waste sludgeremoved from the secondary clarifier is 16,000 mg/l; the gravitybelt thickening captures 95% of the solids in the sludge andincreases the solids content of the thickened sludge to 7%.Calculate: a) Flow rate of primary sludge, in gals/day b) Flow rateof thickened secondary sludge, gals/day. c) Flow rate and solidsconcentration of the blended sludge
A conventional activated-sludge plant treats 10.0 MGD ofmunicipal wastewater with a BOD concentration of 240 mg/l andsuspended solids of 200 mg/l. The sludge flow pattern is shown inFigure 11-1 of the textbook with a gravity belt thickener toconcentrate the excess activated sludge. Primary and thickenedactivated sludge are pumped separately to the anaerobic digester.The primary clarifier removes 50% of the suspended solids and 35%of the BOD. The primary sludge solids content is 4.0%. Theoperating F/M ratio for the activated-sludge process is 0.3 lb BODper day per pound of MLSS. The solids content of the waste sludgeremoved from the secondary clarifier is 16,000 mg/l; the gravitybelt thickening captures 95% of the solids in the sludge andincreases the solids content of the thickened sludge to 7%.Calculate: a) Flow rate of primary sludge, in gals/day b) Flow rateof thickened secondary sludge, gals/day. c) Flow rate and solidsconcentration of the blended sludge
Answer & Explanation Solved by verified expert
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!
Other questions asked by students
StudyZin's Question Purchase
1 Answer
$0.99
(Save $1 )
One time Pay
- No Ads
- Answer to 1 Question
- Get free Zin AI - 50 Thousand Words per Month
Unlimited
$4.99*
(Save $5 )
Billed Monthly
- No Ads
- Answers to Unlimited Questions
- Get free Zin AI - 3 Million Words per Month
*First month only
Free
$0
- Get this answer for free!
- Sign up now to unlock the answer instantly
You can see the logs in the Dashboard.