Question

find the sludge age for a plant that has 14,000 lbs of mlss and receives 2000 lbs of suspended solids a day.

8.2 days
7.0 days
4.6 days
6.3 days

Explanation:

State the sludge age formula

$$ \text{Sludge Age (days)} = \frac{\text{Total MLSS in Aeration System (lbs)}}{\text{Suspended Solids Added (lbs/day)}} $$

Substitute the given values

$$
LATEXBLOCK0
$$

Calculate the final value

$$ \text{Sludge Age} = \frac{14,000}{2,000} = 7.0\text{ days} $$

Answer:

• (A) 8.2 days
• (B) 7.0 days (Correct answer)
• (C) 4.6 days
• (D) 6.3 days