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Liquid treatment such as dewatering of sludge

  • US 4,774,002 A
  • Filed: 10/02/1986
  • Issued: 09/27/1988
  • Est. Priority Date: 10/10/1985
  • Status: Expired due to Term
First Claim
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1. A method of treatment of a liquid, wherein the liquid is caused to flow repeatedly along a duct with a wall permeable to a component of the liquid so that on each passage of the liquid along the duct, as a result of a pressure difference between the inside and the outside of the duct, a filtrate passes through the wall of the duct to increase the viscosity of the remaining liquid and the remainder of the liquid passes along the duct such that the viscosity of the liquid is increased as it passes repeatedly along the duct, the method including monitoring the pressure difference between the ends of the duct as an indication of the viscosity of the liquid and controlling the treatment in accordance with the value of the monitored pressure difference and hence the indicated increase in viscosity.

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