Potato Products & Starch Recovery
Hiller machines provide world-class high-performance decanter centrifuges applicable to a variety of snack food, potato and root crop processing plant starch recovery and pretreatment wastewater applications. The majority of centrifuges applications found at snack food, potato chip, french-fry, flake and potato packers will typically fit into four (4) liquid / solids separation and dewatering application groups:
Starch recovery and starch dewatering
Potato meal
Wash water recycling / cleaning (mud dewatering)
Wastewater effluent treatment
Starch Recovery and Dewatering: Abrasive peeling, slicing and or cutting potatoes and or other root crops causes the cells to release starch which is typically is rinsed off with fresh water before frying or taking the next process step. This potentially valuable starch is often left to wash down through the drain and to the plant wastewater treatment system where it will impact the Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) limits and treatment cost. Ideally many processors will want to find a solution for minimizing this added BOD / COD waste load on their treatment facility and recover the potentially more valuable starch selling to other processers specializing in starch refining or as animal feed. Hydro-cyclones and other systems are commonly used for starch recovery but these generally produce a wetter and more unmanageable starch when compared to a decanter centrifuge. Plus these systems typically do not recover the starch with the same separation efficiently as the decanter centrifuge. The decanter centrifuge separates the solids from the water and produces a dry friable cake material with an average moisture content of less than 40%, and the liquid phase will have had the majority of the solids removed which consequently provides is a dramatic reduction in the BOD / COD load on the plant or city treatment system providing a substantial savings in effluent charges.
With many installations in this sector and excellent co-operation with our clients, we have extracted considerable data from on-site processing results. The majority of the centrifuges installed for starch recovery are operated as lower “G” reduced speed type decanters since these machines can operate at less than 2,000 x “G” and produce the desired results. Other processing plant wastewater treatment applications require more traditional decanter centrifuge operation.
Units installed to recover wash water starch from cutting and / or slicing potatoes at a potato chip manufacturer would on average produced approximately 2-3 tons of recoverable starch from every 100 tons of potatoes processed. The separated starch cake discharged from the decanter centrifuge at 60% dry solids on average with a values ranging up to $180. This proved to be a significant advance in comparison with the traditional hydro-cyclones and other system, which involved hauling the slurry away at 25 to 30% dry weight solids. The reduction in process area and transport costs is also an attractive and valued factor. Whether or not the purchaser of the starch re-slurries the material for further treatment is irrelevant, but it is important to move the starch within a few days of production especially in hot weather (alternatively cold storage) to prevent deterioration of the product.
As results of the success of with potato chip manufactures machines were also installed at French-fry producers. Naturally, the starch yield is less in the case of straight cut French-fries and represents approximately 0.3 - 0.5 % of the potato being processed as recoverable starch at 60% dry weight solids.
Machine Wear Characteristics: No signs of wear to the bowl and screw conveyor.
Process Issues: Gelatinized starch produced by the blanching process or by steam peeling, can cause process concerns with variations in the starch solids being discharged from the centrifuge:
Starch 57 - 60 % dry solids
Gelatinized (slimy) starch at 25 % dry solids
After testing several machine design changes and still experiencing two (2) different starch variations the client modified the potato fiber screen removing the gelatinized starch before reached the decanter centrifuge.
Starch Dewatering Conclusion: The Hiller DecaPress Decanter centrifuge is very well suited for starch dewatering. Where some manufacturers accept the starch as part of their wastewater effluent, there are several incentives to remove the starch upstream of plant or city wastewater treatment facilities:
sell recovered / dewatered starch
Reduce wastewater treatment and effluent costs
Recycle centrate to the pre-wash area
Reduction of fresh water requirement
Potato Meal: Potato peel combined with reject potatoes, and substandard products can be pulverized into slurry. Water is then added and the potato meal slurry can be centrifuged to produce a cake of approximately 40 % dry weight solids.
Potato Meal Conclusio
Potato Products & Starch RecoveryHiller machines provide world-class high-performance decanter centrifuges applicable to a variety of snack food, potato and root crop processing plant starch recovery and pretreatment wastewater applications. The majority of centrifuges applications found at snack food, potato chip, french-fry, flake and potato packers will typically fit into four (4) liquid / solids separation and dewatering application groups:Starch recovery and starch dewateringPotato mealWash water recycling / cleaning (mud dewatering)Wastewater effluent treatmentStarch Recovery and Dewatering: Abrasive peeling, slicing and or cutting potatoes and or other root crops causes the cells to release starch which is typically is rinsed off with fresh water before frying or taking the next process step. This potentially valuable starch is often left to wash down through the drain and to the plant wastewater treatment system where it will impact the Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) limits and treatment cost. Ideally many processors will want to find a solution for minimizing this added BOD / COD waste load on their treatment facility and recover the potentially more valuable starch selling to other processers specializing in starch refining or as animal feed. Hydro-cyclones and other systems are commonly used for starch recovery but these generally produce a wetter and more unmanageable starch when compared to a decanter centrifuge. Plus these systems typically do not recover the starch with the same separation efficiently as the decanter centrifuge. The decanter centrifuge separates the solids from the water and produces a dry friable cake material with an average moisture content of less than 40%, and the liquid phase will have had the majority of the solids removed which consequently provides is a dramatic reduction in the BOD / COD load on the plant or city treatment system providing a substantial savings in effluent charges.With many installations in this sector and excellent co-operation with our clients, we have extracted considerable data from on-site processing results. The majority of the centrifuges installed for starch recovery are operated as lower “G” reduced speed type decanters since these machines can operate at less than 2,000 x “G” and produce the desired results. Other processing plant wastewater treatment applications require more traditional decanter centrifuge operation.Units installed to recover wash water starch from cutting and / or slicing potatoes at a potato chip manufacturer would on average produced approximately 2-3 tons of recoverable starch from every 100 tons of potatoes processed. The separated starch cake discharged from the decanter centrifuge at 60% dry solids on average with a values ranging up to $180. This proved to be a significant advance in comparison with the traditional hydro-cyclones and other system, which involved hauling the slurry away at 25 to 30% dry weight solids. The reduction in process area and transport costs is also an attractive and valued factor. Whether or not the purchaser of the starch re-slurries the material for further treatment is irrelevant, but it is important to move the starch within a few days of production especially in hot weather (alternatively cold storage) to prevent deterioration of the product.As results of the success of with potato chip manufactures machines were also installed at French-fry producers. Naturally, the starch yield is less in the case of straight cut French-fries and represents approximately 0.3 - 0.5 % of the potato being processed as recoverable starch at 60% dry weight solids.Machine Wear Characteristics: No signs of wear to the bowl and screw conveyor.Process Issues: Gelatinized starch produced by the blanching process or by steam peeling, can cause process concerns with variations in the starch solids being discharged from the centrifuge:Starch 57 - 60 % dry solidsGelatinized (slimy) starch at 25 % dry solidsAfter testing several machine design changes and still experiencing two (2) different starch variations the client modified the potato fiber screen removing the gelatinized starch before reached the decanter centrifuge.Starch Dewatering Conclusion: The Hiller DecaPress Decanter centrifuge is very well suited for starch dewatering. Where some manufacturers accept the starch as part of their wastewater effluent, there are several incentives to remove the starch upstream of plant or city wastewater treatment facilities:sell recovered / dewatered starchReduce wastewater treatment and effluent costsRecycle centrate to the pre-wash areaReduction of fresh water requirementPotato Meal: Potato peel combined with reject potatoes, and substandard products can be pulverized into slurry. Water is then added and the potato meal slurry can be centrifuged to produce a cake of approximately 40 % dry weight solids.Conclusio อาหารมันฝรั่ง
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