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Potato Waste Case Study One
Humpty Dumpty Snack Foods
Potato Waste Water, Potato Wastes, Starch
Dewatering, Water Wash Cleaning, Mud Dewatering
Case History
Before
redesigning the effluent system, this plant collected all wastewater streams
to an equalizing pit. The mixed effluent was recycled across a rotating
drum screen to a DAF / hydra cyclone combination tank and back to the
equalizing pit. The clarified underflow water from the DAF tank discharged
to the city. Typically, the effluent quality was measured at 2,000 to
2,500-ppm BOD and 2,000 to 2,500-ppm TSS.
The new plant would utilize a CQ4 to recover starch from
the water used at the 'slicers' and a macerator and Centriquip CQ5 on
the water discharged directly from the equalizing pit to the city.
The overall effect is to reduce BOD by 50-60% to around
1,000-ppm, and reduce TSS to less than 500-ppm.
Overall savings in effluent charges were $575,000 per
year. And the additional revenue from starch production is $105,000 per
year.
Download
Snack Food Industry Decanter Centrifuge Information (PDF - 219K)
Starch Recovery
Feed to the CQ4 is 80-gpm at 0.65% starch. Starch recovery
is in excess of 98% in one pass and the effluent has less than 130-ppm
TSS. The starch cake is 60% dry solids and is dry enough to be sold directly
as a valuable by-product.
Effluent
The in-line macerator protects the CQ5 from foreign metal
or hard objects and converts out of spec potato or product into added
TSS in the feed to the decanter. The system runs at 130-gpm and reduces
TSS to around 550-ppm. The cake is sold as cattle feed. When the (2) two-centrate
streams are mixed together, the effluent to the city is around 1,000-ppm
BOD and 350-400-ppm TSS.
Note: The company plan's to re-plumb the plant and
use the water from the starch machine as wash water for the incoming potatoes.
This will reduce the volume of water used and discharged from the plant,
leading to further savings in costs of both influent and effluent waters.


|
Company
|
Machines
Installed
|
Starch
Recovery
|
Effluent
Treatment
|
|
Advance Foods (WCF)
|
1
|
|
*
|
|
PAS Grantham, Ltd.
|
2
|
*
|
*
|
|
Warrell Morton, Braintree, Essex
|
1
|
|
*
|
|
Garden Isle Frozen Foods, Ltd.
|
3
|
*
|
*
|
|
Walkers Crips, Ltd. Peterlee
|
3
|
|
*
|
|
Ross Foods, Ltd., North Walsham
|
1
|
|
*
|
|
Ross Foodds, Ltd., North Thoresby
|
1
|
|
*
|
|
Everest Frozen Foods, Ltd.
|
4
|
*
|
*
|
|
Frigoscandia, Ltd.
|
2
|
*
|
*
|
|
Golden Wonder, Hunters Foods, Ltd.
|
3
|
*
|
*
|
|
Golden Wonder, Scunthorpe
|
1
|
*
|
|
|
Humpty Dumpty
Snack Foods, Brampton
|
2
|
*
|
*
|
|
Humpty Dumpty Snack Foods, Hartland
|
1
|
*
|
|
|
Hitchen Foods
|
1
|
|
*
|
|
I&K Distributors, Ohio
|
2
|
|
*
|
|
WCF Foods
|
2
|
*
|
*
|
|
Largo Foods, Ltd., Dublin
|
2
|
*
|
*
|
|
Tayto Foods, Ltd., Dublin
|
2
|
*
|
*
|
|
Tayto Foods, Ltd., Tandragee, (NI)
|
2
|
*
|
*
|
|
Ballymoney Foods (NI)
|
1
|
*
|
|
|
The Snack
Factory, Skelmersdale
|
2
|
*
|
*
|
|
Bensons Crips, Preston
|
1
|
*
|
|
|
Birds Eye Walls, Lowestoft
|
1
|
*
|
|
|
Jepson Potatoes, Sandbach
|
1
|
|
*
|
|
Super Pufft, Brampton, Canada
|
2
|
*
|
*
|
|
Highlander Snacks
|
2
|
*
|
*
|
|
 |


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