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Potatoes are used for a variety of purposes, and not only as a vegetable for cooking at home. In

fact, it is likely that less than 50 percent of potatoes grown worldwide are consumed fresh. The

rest are processed into potato food products and food ingredients; fed to cattle, pigs, and

chickens; processed into starch for industry; and re-used as seed tubers for growing the nextseasons potato crop.

Food Uses: Fresh, Frozen, Dehydrated

Fresh potatoes are baked, boiled, or fried and used in a staggering range of recipes: mashed

potatoes, potato pancakes, potato dumplings, twice-baked potatoes, potato soup, potato salad andpotatoes au gratin, to name a few.

But global consumption of potato as food is shifting from fresh potatoes to added-value,

processed food products. One of the main items in that category is frozen potatoes, whichincludes most of the french fries (chips in the UK) served in restaurants and fast-food chains

worldwide. The worlds appetite for factory-made french fries has been put at more than 7

million tons a year. Another processed product, the potato crisp (chips in the US) is the long-standing king of snack foods in many developed countries.

Dehydrated potato flakes are used in retail mashed potato products, as ingredients in snacks, and

even as food aid. Potato flour, another dehydrated product, is used by the food industry to bind

meat mixtures and thicken gravies and soups.

A fine, tasteless powder with excellent mouth-feel, potato starch provides higher viscositythan

wheat and maize starches, and delivers a more tasty product. It is used as a thickener for sauces

and stews, and as a binding agent in cake mixes, dough, biscuits, and ice-cream.

In eastern Europe and Scandinavia, crushed potatoes are heated to convert their starch tofermentable sugars that are used in the distillation of alcoholic beverages, such as vodka andakvavit.

Non-Food Uses: Glue, Animal Feed, and Fuel-Grade

Ethanol

Potato starch is widely used by the pharmaceutical, textile, wood, and paper industries as an

adhesive, binder, texture agent, and filler, and by oil drilling firms to wash boreholes. Potato

starch is a 100% biodegradable substitute for polystyrene and other plastics and used, for

example, in disposable plates, dishes, and knives.

Potato peel and other zero value wastes from potato processing are rich in starch that can beliquefied and fermented to produce fuel-grade ethanol. A study in Canadas potato-growing

province of New Brunswick estimated that 44,000 tons of processing waste could produce 4-5

million liters of ethanol.

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In the Russian Federation and other east European countries, as much as half of the potato

harvest is used as farm animal feed. Cattle can be fed up to 20 kg of raw potatoes a day, while

pigs fatten quickly on a daily diet of 6 kg of boiled potatoes. Chopped up and added to silage, the

tubers cook in the heat of fermentation.

Potato Starch

Potatoes have been used as a source of raw material for high-quality starch for over 150 years. In

addition to product quality, the consumption of fresh water and energy are now playing an ever

more important role in potato starch factories. For this reason, GEA Westfalia Separator Groupdeveloped process lines which also convince users from these economic points of view.

Integrated process line for obtaining potato starch

Integrated process line from GEA Westfalia Separator Group for obtaining potato starch

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Once the potatoes have been broken up and the sand removed, the fruit water is separated by a

decanter. The starch is then extracted followed by washing. The washing line consists of 3-phasenozzle separators in three stages working on the counter-current principle, fresh water only

having to be supplied to the last stage. The separators separate the starch milk into the fractions

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starch, fine fibers and water. In this process, use of 3-phase technology ensures a high starch

yield in top-class quality.

After the last washing stage, the starch arrives for dewatering via a buffer tank. The fine fibersleave washing in the first stage for fine fiber screening. The washed and concentrated starch milk

is dewatered and then dried by decanters. The fine fibers and the pulp from the extraction screens

are dewatered by a decanter. The dewatered pulp can either be dried or extracted from theprocess and used as a feed immediately downstream of the decanter.

About Potatoes

Whether mashed, baked or roasted, people often consider potatoes as comfort food. It is animportant food staple and the number one vegetable crop in the world. Potatoes are availableyear-round as they are harvested somewhere every month of the year.

The potato belongs to the Solanaceae or nightshade family whose other members includetomatoes, eggplants, peppers, and tomatillos. They are the swollen portion of the underground

stem which is called a tuber and is designed to provide food for the green leafy portion of the

plant. If allowed to flower and fruit, the potato plant will bear an inedible fruit resembling atomato.