The following data have been obtained in a BOD test that is made to determine how well a wastewater treatment plant is operating. You need to process the data. What percentage of the BOD is being removed by this treatment plant? If this is a secondary treatment plant that is supposed to remove 85% of the BOD5, would you say it is operating properly? **Table: Dissolved Oxygen Levels in Sewage Samples**| Sample Type | Initial DO (mg/L) | Final DO (mg/L) | Volume of Wastewater (mL) | Volume of Dilution Water (mL) ||-------------------|-------------------|-----------------|---------------------------|-------------------------------|| Untreated Sewage | 6.0 | 2.0 | 5 | 295 || Treated Sewage | 9.0 | 4.0 | 15 | 285 |**Explanation:**This table presents data on the dissolved oxygen (DO) levels in both untreated and treated sewage samples. - The **Initial DO** refers to the concentration of oxygen in the water before treatment or natural processes. - The **Final DO** indicates the concentration after these processes.- The **Volume of Wastewater** shows the amount of wastewater sampled.- The **Volume of Dilution Water** explains the amount of water used to dilute the wastewater sample for analysis.The table illustrates how treatment affects the dissolved oxygen levels, with treated sewage maintaining higher DO levels than untreated sewage. This data highlights the effectiveness of treatment processes in improving water quality.

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Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter2: Municipal Solid Waste Characteristics And Quantities

Section: Chapter Questions

Problem 2.9P

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The following data have been obtained in a BOD test that is made to determine how well a wastewater treatment plant is operating. You need to process the data. What percentage of the BOD is being removed by this treatment plant? If this is a secondary treatment plant that is supposed to remove 85% of the BOD5, would you say it is operating properly?

**Table: Dissolved Oxygen Levels in Sewage Samples**

| Sample Type | Initial DO (mg/L) | Final DO (mg/L) | Volume of Wastewater (mL) | Volume of Dilution Water (mL) |
|-------------------|-------------------|-----------------|---------------------------|-------------------------------|
| Untreated Sewage | 6.0 | 2.0 | 5 | 295 |
| Treated Sewage | 9.0 | 4.0 | 15 | 285 |

**Explanation:**

This table presents data on the dissolved oxygen (DO) levels in both untreated and treated sewage samples.

- The **Initial DO** refers to the concentration of oxygen in the water before treatment or natural processes.
- The **Final DO** indicates the concentration after these processes.
- The **Volume of Wastewater** shows the amount of wastewater sampled.
- The **Volume of Dilution Water** explains the amount of water used to dilute the wastewater sample for analysis.

The table illustrates how treatment affects the dissolved oxygen levels, with treated sewage maintaining higher DO levels than untreated sewage. This data highlights the effectiveness of treatment processes in improving water quality.

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Initial DO (mg/L) Final DO (mg/L) Volume of Volume of wastewater (mL) dilution water (mL) Untreated sewage Treated sewage 6.0 2.0 295 9.0 4.0 15 285