Calculate Overflow Rate w/ Interpolation: BOD Removal 80%

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SUMMARY

This discussion focuses on calculating the overflow rate for a circular sedimentation tank in a treatment plant that achieves 80% BOD removal. The influent BOD concentration is 214.245 mg/l with a flow rate of 848 kL/day, and the target BOD concentration before discharge is 30 mg/l. The provided table lists BOD removal percentages and corresponding overflow rates, but does not include an 80% removal rate. Participants discuss the necessity of interpolation to estimate the overflow rate for this percentage, emphasizing the importance of accurate calculations in wastewater treatment design.

PREREQUISITES
  • Understanding of BOD (Biochemical Oxygen Demand) and its significance in wastewater treatment.
  • Familiarity with sedimentation tank design principles and detention time calculations.
  • Knowledge of interpolation techniques for estimating values from data tables.
  • Basic proficiency in wastewater flow rate calculations and conversions.
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  • Research interpolation methods in mathematical contexts, specifically linear interpolation.
  • Study the design criteria for circular sedimentation tanks in wastewater treatment.
  • Explore BOD removal efficiencies and their impact on treatment plant performance.
  • Learn about the implications of influent BOD concentrations on downstream treatment processes.
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Environmental engineers, wastewater treatment plant operators, and students studying water resource management who are involved in designing and optimizing treatment processes.

Stacyg
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Interpolation ?

A treatment plant consists of a primary sedimentation tank followed by a trickling filter that removes 80% of the influent BOD. The flow is then directed to a constructed marsh system that has an influent target BOD concentration of 30 mg/l before being discharged to a small stream.

Using the following table of % BOD removal to overflow rate and calculate the dimensions of a circular sedimentation tank suitable for the imposed flow with a detention time of 1.5 hours. Assume BOD and flow of wastewater entering the plant to be 214.245 mg/l and 848 kL/day.
BOD Removal % 22.0 31.5 33.5 35.5 36.5 37.5
Overflow rate m3/m2/day 100 50 40 30 25 20

How do I find the value of overflow rate when the BOD removal percentage is 80% from this table?
Do I use interpolation ? I'm not sure on how to use interpolation.

Thanks Stacy.
 
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hi stac
2 questions
- first, do you have any ideas how to do it?
- 2nd are you sure its 80% BOD removal? this is a very large extrapolation of the table... could it be calculate BOD rate by interpolating from a given overflow rate?
 


I know how to answer the question, just not how to find the overflow rate at 80% BOD.
The question is exactly what I have written so i have to find the overflow rate at 80% BOD.
Thanks Stacy