Analyses of Fat Oil and Grease in Wastewater or Receiving Water
Why do we need new and improved on-line monitoring and data analyses in wastewater treatment?
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Transcript of Why do we need new and improved on-line monitoring and data analyses in wastewater treatment?
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Helsinki Region Environmental Services Authority
HSY
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• An end user’s point of view• Today’s – and tomorrow’s – challenges in wastewater
treatment– Linked to MMEA research and development projects by
e.g. Valmet, VTT and the Universities of Oulu and of Eastern Finland using Viikinmäki WWTP as measuring platform
”Why do we need new and improved on-line monitoring and data analyses in wastewater treatment?”
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”Why do we need new and improved on-line monitoring and data analyses in wastewater treatment?”
Process Challenges
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•Requirements‒Good effluent
quality (constantly)‒Sludge quality
Challenges
•Limitations‒Space, energy,
chemicals, work
•External conditions‒Fluctuating loading‒Temperature changes
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Fluctuating Loading ConditionsOrganic load (kg BOD/d)Flow (m3/d)
Temperature (oC)
Solids (mg/l)on-line value
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•Stricter requirements‒N, P, COD…
•New requirements‒Chemicals, drugs,
metals, pathogens…
Challenges …tomorrow
•More efficient use of resources
•Increasingly challenging conditions‒Growing influent loads‒More extreme rain events
‒Energy‒Chemicals‒Footprint
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•Higher level of automation
‒Control of flows, chemical feeds and biological process
•Higher knowledge‒Better tools for
operators
Tools
•Reliable measurements in challenging conditions
‒E.g. solids measurements in sludge treatment
•Intelligent use of data‒Correlations, predictions…‒Clear outputs
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Influent Quality
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Challenges• Large variations in influent concentrations
– Largely correlated to solids content • Laboratory anayses are time consuming and costly
– Not done daily, even less hourly• Problematic environment for on-line measurements
– Solid wastes, grease and sand• Measurement values could be used for:
– Raw sludge pumping (thickening, constant load to digestion)
– Treating by-pass waters (chemical dosages, treatment result)
Reliable on-line measurement of influent solids
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Activated sludge
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Activated Sludge
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Challenges• Good flocs in activated sludge
– Settling good treatment result & hydraulic capacity– Thickening high retention time and gas production in
digestion• Microscopic examination of flocs
– Time consuming– Requires praxis– Subjective – The registered values are vague
On-line optical monitoring of floc morphology Processing of data to information
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Sludge Drying
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• The ”success” of sludge drying has a large impact on operation costs– Amount of dried sludge (10 tons 30 % TS vs. 20 tons 15 % TS) – Internal load from reject water solids– Feasibility of treating reject water for total nitrogen
• Polymer use– Crucial, expensive Must be optimised
NOTE: This applies to biowaste digestion plants as well !
Challenges
Reliable on-line solids measurements of thickened sludge and reject water
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Using Measurement Results for Optimal Process Control
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Challenges• Vast amount of measurements
– With very different levels of importance• Varying time scales• Interpretation of results, values can be important:
– As such – In relation to other values– The magnitude and the direction of change
• Optimal operation in changing conditions ?
Intelligent data processing and useful (= simple) outputs
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Thank You!
Helsingin seudun ympäristöpalvelut -kuntayhtymäSamkommunen Helsingforsregionens miljötjänsterHelsinki Region Environmental Services Authority
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