## X2

1070 + 2900 3970 mg/l

3. Calculate the required detention time:

Required volume = 0.05 mgd (18) = 0.9 mg = 120,000 ft3

4. Calculate the oxygen requirements. Compute the average oxygen requirement by calculating the area under the curve in Figure 7.44.8 and dividing it by the design detention time.

Area under the oxygen curve Average daily use

7310 mg/l O2 7310/18 406 mg/l day

Similarly, estimate the average VSS during a test period to determine the specific oxygen requirements.

Area under curve Average VSS concentration Specific oxygen utilization

43,040 day-mg/l 2390 mg/l 406/2390 0.17 mg/mg/day

The total oxygen requirements based on an average VSS concentration X2 in the digester effluent of 3970 mg/l are then:

## Trash Cash Machine

How recyclable trash can save the world and bank us huge profits! Get All The Support And Guidance You Need To Be A Success At Recycling! This Book Is One Of The Most Valuable Resources In The World When It Comes To How To Make Profits With Trash!

Get My Free Ebook