Case Study: Lime Dewatering Filter Press

Among the solutions we offer, our 1500 mm, 250 cubic feet filter press has proven successful for a municipal application: dewatering lime. Most recently, our team worked with a drinking water facility in Ohio to address the filtration and disposal needs for a large amount of lime used there. The results have been positive for all involved, including the local farming community.

Lime Dewatering Solution

M.W. Watermark manufactured two 1500 mm, 250 cubic foot filter press systems for Aqua America. Both units were set up in a major drinking water facility in Massillon, Ohio. With local communities depending on the plant for their water supply, it is critical that the facility have modern water treatment methods and a responsible way to dispose of the byproducts caused by treatment.

Lime Dewatering Filter Press Image - M.W. Watermark Photo Of Filter Press Used In Lime Dewatering Process - M.W. Watermark

The water supply in Massillon, OH is naturally hard. It is softened through the addition of lime (calcium hydroxide) which removes the calcium and magnesium ions. Once the water has been softened, the lime solids must then must be removed from the water. With the new equipment in place, the lime slurry is pumped through this modern filtration system and dewatered using pressure filtration.

The solid lime materials are ground up with an M.W. Watermark screw conveyor and disposed of in a responsible way– they go to local farmers as a natural source of fertilization for their soil. The filtrate, or liquid, that results from the process is pumped back through to the head of the plant and re-used. The results have been very positive, and the future looks bright for this hard-working processing plant. See the system for yourself in this brief video.

Video: Filter Press for Lime Dewatering


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Case Study: Lime Dewatering Filter Press
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2 thoughts on “Case Study: Lime Dewatering Filter Press

  • August 19, 2014 at 9:53 am

    Very useful case study, thanks very much for sharing. This is a very useful piece of information for me as im researching for the drinking water industry in the Middle East. Do you ever use silicone sponge in your presses?

    • August 20, 2014 at 8:40 am

      Thank you, Mike! No we do not use silicone sponge; it’s compressible and would not work well for this equipment. Filter plates are typically made from polypropylene and do not easily compress.


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