Treatment of Slaughterhouse Wastewater - CE 479 - Lawrence - Fall 2006
Treatment of Slaughterhouse Wastewater - CE 479 - Lawrence - Fall 2006
Treatment of Slaughterhouse Wastewater - CE 479 - Lawrence - Fall 2006
Slaughterhouse
Wastewater
Mike Lawrence
Mike Lawrence
NDSU
Fall 2006
Overview
Challenges
Wastewater
Parameters
Treatment Options
Process Modifications
Typical On-site Treatment Options
Design Problem
Challenges of Slaughterhouse
Wastewater
Wastewater
Wastewater Parameters
BOD
Treatment Options
Discharge to sewer to be treated by
municipal treatment plant
Land application of wastewater for
irrigation
Reduce amount of wastewater and/or
concentrations with the wastewater by
changing the processes
On site Treatment
Line Separation
Separating
Blood Recovery
Blood has ultimate BOD of 405,000 mg/L
One head of cattle contains 49 lbs. of
blood which equals 10 lbs. BOD, compared
to 0.2 lbs. discharged per person per day
All blood should be recovered in a
separate line draining to a tank
Blood is then dried, commonly a
continuous drier is used
Profitable end product
Stockpen Area
Stockpen
On-Site Treatment
Costs
Hydrasieve
Hydrasieve
Width Height Capacity Estimated
(ft)
(ft)
(gpm)
Price
2
75
$5,200
3.5
150
$6,400
4.5
300
$8,000
5.5
400
$10,000
6.5
500
$12,000
7.3
1000
$20,000
14
7.3
2000
$40,000
21
7.3
3000
$60,000
28
7.3
4000
$80,000
35
7.3
5000
$100,000
to
to
to
30
50
60
Dissolved
30
60
80
%
%
%
BOD removal
SS removal
grease removal
to 35 % BOD removal
% SS removal
% grease removal
Anaerobic Lagoons
Ideally the lagoon would be covered, odor &
gas production contained, heat retention
Not well suited for colder climates
Detention time 20 to 50 days
BOD5 loading= 200 to 500 lb/ac.-d
Design Problem
Flowrate:120,000
300 gpm
TSS=1500 mg/L
COD=5000 mg/L
sCOD=3000 mg/L
BOD5=2,000 mg/L
Reduce
Screening
Hydrasieve
Use
Primary
Loading
10 ft
8 ft
25 ft
Anaerobic Lagoon
Covered
days
Plan View
400 ft
400 ft
Clarifier
Flocculator,
Deglassifier
10 ft
46 ft
Loading
Rate of 10 kg sCOD/m3-d
Two tanks, operated in parallel
Diameter = 4.5 m, Height= 7 m,
2.5 m for gas
storage
4.5 m
7m
Final Design
Include