Auto Primary Sludge Tank De- Sludgeing - SWIG · 2014. 11. 27. · Auto Primary Sludge Tank De-Sludgeing Alistair Mackinnon ... How does the SF2 System Work? The Viper Transducer
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Auto Primary Sludge Tank De-Sludgeing
Alistair Mackinnon
Director of Sales and Marketing
Non Contacting Level and Flow Instrumentation
Continuous level indication
Density differential 0.5%
2 transducer inputs - SludgeInterface or Level
0-10M range
2 x 4-20mA outputs
6 x 2A Relays
Screen display
Self Cleaning transducer
Power Supply 110-240VAC or24VDC
Effective sludge detection and control
Sludgefinder 2
How does the SF2 System Work?
The Viper Transducer must be inserted intothe water to become operational, if the headis out of the water LOE will occur.
A high frequency Ultrasonic Sound wave at700khz is then generated by the Viper andtravels through the liquid at 1482 m/s.
The echoes from any distinct density changesare reflected back to the Transducer and re-excite the crystal. The time taken for theUltrasound path is then Integrated by theunit and a distance to the Interface iscalculated.
ZeroAdjust
Range
Level
TankDepth
Reference Point - Top WaterLevel
InsertionDepth
Range(Distance)
Tank Depth
BlanketLevel
Sludge Display & Echo
Controller Sludge Display
Laptop Echo Display
Background• Stoke Bardolph STW.• Largest waste water
treatment plant inNottingham.
• 8 Primary tanks.• Power generation via
digestion plant.• Measurement and control
of blankets by dips andtime.
• Electrical powergeneration was notefficient due to sludgequality
Project Overview
• To produce sludge atideal density fordigestion (5 /6%).
• Hydraulic pumpsinstalled to handlehigher density sludge.
• Density monitorsinstalled.
• Sludge Finder 2 installedfor auto de sludgeingand alarm indication.
Project Overview
Project Overview
Project Overview
Project Overview
Project Overview
Project Overview
• Controller mountedon rotating bridge.
• Radio Telemetrysystem rejected bycontractor.
• Slip rings used totransmit 4-20mA and3 alarms.
• Slip rings were wellmaintained.
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
30.0%
35.0%
40.0%
45.0%
13/0
4/20
11 1
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Blan
ket
% a
gain
st t
ank
dept
h
Project Overview
Typical SCADA Trace
Conclusion
• The scheme has been a resounding success.• Stoke Bardolph generates 5.5MW (5500KW) at
full power.
• Enough energy is produced, not only to powerequipment on site, but also to return a netsurplus of electricity to the Grid; making thesite energy self-sufficient.
Other Totex Examples
Pump Station Flow Monitoring
DCWW Flow Pulse
• Installation savings of £1.5 million.
• Predictive maintenance information.
• Prioritisation of assets.
• Confined spaces• Limited pipe clearance
DCWW Case Study
DCWW Case Study• 150 units installed so far• Portable system used to identify best position• 100 systems live on Scopex telemetry
DCWW Case Study
DCWW Case Study
Bishopston SPS
Sludge Monitoring andControl
FST Compliance
FST Compliance• The Sludge level in the settlement tanks is maintained
at a level termed ‘healthy’.• If the sludge level rises above that point, reaching a
‘flush’ level, the bellmouth valves are activated,returning the level to the setpoint.
• There may be a number of reasons that a tank reachesthe flush level under normal circumstances, but it mayalso be an indication of a problem. The systemtherefore allows four flush events within an hourbefore an alarm is generated.
• Staff visits to resolve issues are substantially reduced,an important saving in vehicle miles and man hours.
• A further benefit is that the settlement tanks can becontrolled more effectively, reducing pumping hoursand saving further energy.
FST Compliance
FST Compliance
FST Compliance
FST Compliance
Ultimate PumpController
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Thank You
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