Solids Handling - Wastewater Operators - page 367

 Example 10.4

Problem: What is the sludge pumped in pounds per day?

Solution :

Sludge = 43,200 gal/day × 8.34 lb/gal = 360,300 lb/day

10.4.5 Pounds solids Pumped per day

Solids Pumped (lb/day) = Sludge Pumped (gpd) × % Solids (10.5)

 Example 10.5

Problem: What are the solids pumped in pounds per day?

Solution:

Solids Pumped = 360,300 lb/day × 0.0370 = 13,331 lb/day

10.4.6 Pounds volatile Matter Pumped per day

Volatile Matter (lb/day) = Solids Pumped (lb/day) × %VM (10.6)

 Example 10.6

Problem: What is the volatile matter pumped in pounds per day?

Solution:

Volatile Matter = 13,331 lb/day × 0.66 = 8798 lb/day

Note: If you wish to calculate the pounds of solids or the pounds of
volatile solids removed per day, the individual equations demonstrated
above can be combined into a single calculation:

Solids (lb/day) = PumpTime(min/cycle) × Frequ ency (cycles/day)

(10.7a)

× Rate (gpm)8.34lb/gal × × olids S

Volatile Matter(lb/day) = Time (min/cycle) × requency (cycles/day)

Rate (gpm)8.34lb/g

F

(10.7b)

× × al × % Solids%VM ×

 Example 10.7

Solids = 15 min/cycle24 cycles/day120 gpm8 × × × .34lb/gal × 0.0370

=
=

13,331lb/day

VM 15 min/c ycle24 cycles/day120 gpm8.34lb/gal × × × × 370 66 0.0 ×

= 8798lb/day