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Home > Case Studies > 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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