2. Please design a Type II settling tank that receives a 1000 m3/day of a waste stream, after flocculation, that displays the following settling behavior. The initial concentration for this test is 500 mg/L. Time (min) 5 10 20 30 40 50 60 75 1 meters 481 418 331 270 225 193 154 133 2 meters 490 456 425 361 325 279 240 198 3 meters 495 483 463 413 369 333 290 259 Concentrations are in mg/L If the required removal rate is 50%, how large should the tank be?
2. Please design a Type II settling tank that receives a 1000 m3/day of a waste stream, after flocculation, that displays the following settling behavior. The initial concentration for this test is 500 mg/L. Time (min) 5 10 20 30 40 50 60 75 1 meters 481 418 331 270 225 193 154 133 2 meters 490 456 425 361 325 279 240 198 3 meters 495 483 463 413 369 333 290 259 Concentrations are in mg/L If the required removal rate is 50%, how large should the tank be?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:**Designing a Type II Settling Tank**
The task is to design a Type II settling tank that processes 1,000 m³/day of a waste stream, post-flocculation. The initial concentration for this test is 500 mg/L. Below is the data showing the settling behavior over time and at different depths.
| Time (min) | 1 meter | 2 meters | 3 meters |
|------------|---------|----------|----------|
| 5 | 481 | 490 | 495 |
| 10 | 418 | 456 | 483 |
| 20 | 331 | 425 | 463 |
| 30 | 270 | 361 | 413 |
| 40 | 225 | 325 | 369 |
| 50 | 193 | 279 | 333 |
| 60 | 154 | 240 | 290 |
| 75 | 133 | 198 | 259 |
**Concentrations are in mg/L.**
**Objective:**
If the required removal rate is 50%, calculate how large the tank should be.
**Analysis of Data:**
- Concentrations decrease over time, indicating settling is occurring.
- Measurements at various depths (1, 2, and 3 meters) show variations in concentration over time, suggesting stratification in settling rates.
For educational purposes, this data helps in understanding the dynamics of waste concentration reduction over time within the settling tank. Proper calculations will allow for optimizing tank design to achieve the desired removal efficiency.
Expert Solution
Step 1: Given
Flow of water per day = 1000m3/day =1000/24m3/hour,
Let the detention period be 2hrs(assumed based on table)
To Determine : Dimensions of tank.
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