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Pressure Filters for Starch

Larox now has now delivered over 45 pressure filters to starch producers worldwide saving energy, reducing wash liquid requirements, increasing capacities and reducing capital costs. Applications include native and modified starches in industrial, food and pharmaceutical grades.

Larox was cited in July 2003 US government report on energy savings opportunities in Wet Corn Milling:

Excerpt from "Energy Efficiency Improvement and Cost Saving Opportunities for the Corn Wet Milling Industry", July 2003 Pages 44 and 45:

"Starch dewatering filters The material fed into a starch dryer is typically dewatered with a centrifuge or hydrocyclone system. Larox has developed a filter that can dewater the starch cake before being sent to the dryer with a higher throughput, lower energy use and lower moisture content than the conventional systems (Larox, 2002). The filter replaces two washing centrifuges and one dewatering centrifuge, simplifying the process, reducing maintenance costs and reducing required space amounts. Larox claims their filters require only 10% of the installed power of a conventional centrifuge dewatering system. They estimate that the Larox Pressure Filter provides electricity savings of 640,000 kW annually. In addition, less water is used in the process, smaller initial investment is required for new installations and by increasing throughput, overall plant capacity is increased (Larox, 2002)."

The combination of less wash water requirement and a dryer filter cake reduces downstream operating costs for both drying of the product and handling of the waste streams

Applications

• Corn (Maize)

• Potato

• Rice

• Tapioca (Cassava)

• Wheat

• Other special starches

Benefits

• Dryer solids

• up to 15% higher compared to drum filters

• up to 10% higher compared to centrifuges

• reduced drying costs

• increased drying capacity

• Operational savings

• washing and dewatering in one unit

• up to 75% less wash liquid needed

• up to 50% less energy needed

• reduced waste handling costs

• Reliability

• more stream uptime