WATER & WASTEWATER MOBREY MSM400
Central Valley Facility Reduces Material Cost and
Calibration Time with Mobrey MSM400
RESULTS
• Improved measurement accuracy
• Reduced labor costs for calibrating and monitoring the processes
• Reduction in material cost
APPLICATION
Monitoring and control of sludge solids content in municipal
wastewater plant
CUSTOMER
Central Valley Water Reclamation Facility (CVWRF), USA
“The Mobrey MSM400 is working
so well, calibration time is
significantly reduced and less
heat and polymer is required in
the digester system.”
Dean Thornwall, CVWRF
CHALLENGE
CVWRF monitors the sludge density level sent to their digester to
save energy and control operation costs. They use heat and polymer
to operate the digester. The more solids and less water they send
to the digester, the less they have to heat the digester and the less
polymer they have to use.
To achieve this CVWRF was using a sludge density meter to monitor
solids density in the sludge going from the clarifier to the digester.
The meter was used to control the sludge pumps to keep the solids
mix at approximately 6%. The meters were difficult to calibrate, had
to be calibrated weekly and did not provide a reliable enough reading
to allow the sludge pumps to keep the proper mix.
The weekly labor involved in calibrating the meters combined with
their inaccuracy, made it difficult to keep the sludge mix at the
desired 6%. This resulted in lost revenue in heating the digester,
using additional polymer and increased labor costs for calibrating
and monitoring the meters, sludge pumps and processes.
Mobrey MSM400 controller and sludge sensor
installation
WATER & WASTEWATER Installation of the Mobrey sludge
density sensors
SOLUTION
To address these challenges, CVWRF installed Emerson’s Mobrey
MSM400 suspended solids controller along with Mobrey MSM solids
density sensors in the system. The meter was easily calibrated and
matched their lab readings within 0.2%.
The installation resulted in significantly reduced calibration time, with
the additional benefit that less heat and polymer were needed in the
digester system.
The CVWRF was very happy with the results and purchased additional
units to place in their system. The new Mobrey MSM400 meters are
working so well and reliably that CVWRF is planning to change their
calibration frequency from weekly to monthly.
RESOURCES
Mobrey MSM400 Sludge Density Meter
http://www2.emersonprocess.com/en-US/brands/mobrey/LevelProducts/Ultrasonic/MSM400/Pages/index.aspx
Emerson Process Management Power and Water Solutions
http://www2.emersonprocess.com/en-US/divisions/power-water/
Pages/powerwater.aspx
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