Geoscience Reference
In-Depth Information
EXAMPLE 24.119
Problem: The biosolids feed to a belt filter press is 120 gpm. If the total suspended solids concentra-
tion of the feed is 4%, what is the solids loading rate in lb/hr?
Solution:
Solids loading rate (lb/hr) = Feed (gpm) × 60 (min/hr) × 8.34 lb/gal × (%TSS/10 0)
= 120 gpm × 60 min/hr × 8.34 lb/gal × (4/100) = 2402 lb/hr
24.14.2.2.4 Flocculant Feed Rate
The flocculant feed rate may be calculated like all other mg/L to lb/day calculations and then con-
verted to a lb/hr feed rate, as follows:
Flocculant (mg/L)
× feed rate (MGD)
×
8.34 lb/gal
Flocculant feed (lb/day)
=
(24.153)
24 hr/day
EXAMPLE 24.120
Problem: The flocculant concentration for a belt filter press is 1% (10,000 mg/L). If the flocculant
feed rate is 3 gpm, what is the flocculant feed rate in lb/hr?
Solution: First calculate lb/day flocculant using the mg/L to lb/day calculation. Note that the gpm
feed flow must be expressed as MGD feed flow:
3 gpm 1440 min/day
1,000,000
×
=
0.00432 MGD
Floc
culant feed (lb/day)
=
Flocculant (mg/L) fee=
×
ddrate(MGD)
×
8.34 lb/gal
= 10,000 mg/L
× .00432 MGD
0
×
8.34 lb/gal
= 360 lb/day
Then convert lb/day flocculant to lb/hr:
360 lb/day
24 hr/day
=
15 lb/hr
24.14.2.2.5 Flocculant Dosage
When the solids loading rate (tons/hr) and flocculant feed rate (lb/hr) have been calculated, the
flocculant dose in lb/ton can be determined. The equation used to determine flocculant dosage is
Flocculant (lb/hr)
Solids treated (ton/hr)
Flocculant dosage(lb/ton) =
(24.154)
EXAMPLE 24.121
Problem: A belt filter has solids loading rate of 3100 lb/hr and a flocculant feed rate of 12 lb/hr.
Calculate the flocculant dose in lb per ton of solids treated.
 
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