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Suspended Solids Density Meter: Maintain Your Concentration

Posted: Thursday 27th August 2015

The Suspended Solids Density Meter, from Markland Specialty Engineering, provides real-time knowledge of sludge and slurry concentrations in pipes, tanks and clarifiers. It helps Utilities and industrial sewage treatment plants to optimize dosing and automate silt and sludge removal, for improved feed density and de-watering.

This process control instrument measures primary, secondary, return-activated and backwash sludge. This information assists operators in adjusting polymer dosages for preferred concentrations, and allows users to program underflow pumps to shut off before sludge density becomes too thin, for enhanced filter press/centrifuge/digester performance. These efficiencies contribute to improved outflow available for reuse. By observing changes in density, operators may also gain early awareness of breaks in filtration material.

The meterís sensor transmits and receives safe, non-radioactive ultrasound waves (no permits, no approvals needed). It sends out a pulse of sound, receiving a strong echo and reading zero when the solution is clear. When solid particles are present in the liquid, they absorb or deflect the sonic energy, reducing the amplitude of the echo. Marklandís meter provides a continuous reading of the percentage of these suspended solids (%SS), and enables calculation of mass flow rate. Readings are not affected by the colour of particulates or fluid.

The instrument is available as a non-intrusive inline pipe spool-piece or a throw-in style probe. Both versions are simple to install, calibrate and clean. The spool-piece is supplied in various pipe sizes and materials, including PVC and carbon/stainless steel. The throw-in version may also be used as a single point interface level detector, allowing operators to program de-sludge pumps to turn on when the rising sludge blanket comes in contact with it.

Equipped with a continuous awareness of sludge and silt density at critical points in the sewage treatment process, plants can more effectively control and efficiently reduce flocculent and energy use.

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August 2021

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