Improve Wastewater Treatment and Save Money with Process Monitoring | YSI IQ SensorNet
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How to Improve Your Wastewater Treatment Process and Save Money with Online Process Monitoring YSI WASTEWATER WEBINAR SERIES
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Transcript of Improve Wastewater Treatment and Save Money with Process Monitoring | YSI IQ SensorNet
How to Improve Your Wastewater Treatment Process and Save Money with Online Process Monitoring YSI WASTEWATER WEBINAR SERIES
Benefits of Online Process Monitoring
Meet regulatory requirements Improve process performance and reliability Record data and create reports Save chemicals, energy, labor Reduce risks Ensure a good night’s sleep
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Presenter
Presentation Notes
Why control my wastewater plant. Mine has been running fine. Perhaps! Water has been going in and coming out the other end and it looks pretty good when it comes out. At least it looks better than when it went in. But how good is it? Will it meet the regulations and scrutiny of tomorrow? Can you trim your operating costs? How does it handle flow and load flucutuations? Are your process control decisions based on anecdotes or are they data-driven? Text from WEF manual
Case Studies
Fox River Water Pollution Control Center, Brookfield, WI Chemical P Removal / P700 Johnson County (KS) Wastewater Sludge Wasting / ViSolid Missoula Wastewater Division Aeration Control / FDO Littleton – Englewood Wastewater Treatment Plant Chloramination – ORP, AmmoLyt New York City Department of Environmental Protection Denitrification Carbon Dosing Control / NitraVis, NitraLyt 3
Chemical Phosphorus Removal
4 Image courtesy CH2M
Fox River Water Pollution Control Center Brookfield, WI
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Year Alum (gal.) Alum (tons)
TP effluent (mg/L) Alum Cost
2013 (before) 99,329 265 0.67 $121,759 2015 (after) 90,379 243 0.72 $104,233
Presenter
Presentation Notes
Brookfield is geographically unique. The city straddles the sub-continental divide. Sewage flows originating on the eastern side of the city flow to the Milwaukee Metropolitan Sewerage District (MMSD), are treated there and are discharged to Lake Michigan, eventually ending up in the Atlantic Ocean. The western "half" of the city flows to the Fox River Water Pollution Control Center (FRWPCC) operated by the City of Brookfield. Effluent from the plant discharges to the Fox River (Illinois Fox basin) ending up in the Mississippi River and the Gulf of Mexico.��The FRWPCC is an activated sludge plant with tertiary filtration and was designed for an average daily flow of 12.5 million gallons per day (MGD). The plant can handle peak wet weather flows of 50 MGD.�
Simultaneous Precipitation
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Alum
‘P’
Orthophosphate Monitoring System
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Orthophosphate Monitoring System
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Alum Dosing Control System
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Floating Point Control – timed response, direct acting, deadband, biased response
Presenter
Presentation Notes
Not PID control. Text from Tom’s slides
Alum Dosing Control System
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Image courtesy of Rick Wenzel
Optimization: Increase adjustment down?
Presenter
Presentation Notes
Annotate with Tom’s notes
Alum Dosing Control System
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Image courtesy of Rick Wenzel
Presenter
Presentation Notes
Annotate with Tom’s notes
Tips for Trouble-Free Operation
Keep a spare filter in frame on hand Rotate the filters through chemical cleaning in bleach
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Sludge Wasting
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Flow (Q), TSS(Xe) Volume (V),
MLSS
RAS, TSS(Xr) WAS, TSS(Xr)
Biomass in the system Biomass leaving the system ÷
Douglas L. Smith Middle Basin WWTP Overland Park, KS
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SRT control for settleability Better, more consistent performance 2015 NACWA Gold Peak Performance Award
Presenter
Presentation Notes
Johnson County Wastwater in northeastern KS (sububan KC) is a very progressive utility. The Douglas L. Smith Middle Basin facility is 1 of 6 major facilities in the District. Treatment plant capacity is 14.5 million gallons per day (mgd) (county total 62.2 mgd); The Middle Basin treatment plant is among the first in the Kansas City, Mo., metropolitan area to incorporate BNR technology to reduce its discharge of phosphorus and nitrogen. Other recent mprovements included the construction of a new anaerobic digester, a fats, oils and greases (FOG) station to more efficiently receive and treat used greases and oils from restaurants and industries and a cogenerations system to produce virtually all the plant’s annual operating energy from captured biogases. In 2014, Johnson County Wastewater had a 99.7 percent compliance rate with regard to NPDES discharge limits. Of a possible 2,237 violations, the department recorded seven violations for the year.
TSS Monitoring System
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Solids Retention Time Control System
Image courtesy of Marc Pedrotti 16
Solids Retention Time Control System
Image courtesy of Marc Pedrotti 17
Tips for Trouble-Free Operation
Build a long-term relationship Design in measurement reliability QWASSP = [(MLSSBNR x VOLAB / SRT) - QINF x TSSEFF] / TSSRAS
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Cascade Aeration Control
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Missoula WWTP Missoula, MT
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Probe Maintenance Reliabilty Air flow
Control Precision
Membrane DO 4 hrs./wk Lower Higher Less FDO 700IQ 1 hr./wk Higher Lower More
Presenter
Presentation Notes
The Missoula Wastewater Treatment Plant is an advanced secondary treatment facility with biological nutrient removal and ultraviolet disinfection. The Facility reat 6-9 million gallons of wastewater each day prior to reintroducing it to the Clark Fork River. �
DO Monitoring System
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4 bioreactors 5 aerobic cells 16 FDO 700IQ optical DO probes
Images courtesy of Gene Connell
DO Control System
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Image courtesy of Gene Connell
DO Control System
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Image courtesy of Gene Connell
Tips for Trouble-Free Operation
Operator(s) put in charge of probe maintenance Monitor DO at downstream end of basins (most energy efficient)
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Chloramine Disinfection
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Ammonia (NH3): • is present in WW • must be removed • is required for
chloramine disinfection
Presenter
Presentation Notes
Zone 1 – Major reaction is formation of monochloramine. The peak of the curve occurs at a molar ratio of 1:1 between Cl2 and NH3 (5:1 weight ratio) Zone 2 – oxidation results in the formation of dichlaramine and oxidation of ammonia which reduces both the residual chlorine and total ammonia. The ratio at the breakpoint is 7.6:1. Ammonia is at a minimum Zone 3 – After the breakpoint in Zone 3, free chlorine residual dichloramine, nitrogen trichloride, and nitrate increase.
Littleton-Englewood WWTP Englewood, CO
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Switched to ORP control: Cl2 residual analyzer required continual operator attention. DPD test kit was getting interference; Difficult to set the proper dosage. Sodium bisulfite overdosed to assure compliance with chlorine residual limit.
Presenter
Presentation Notes
The Littleton/Englewood Wastewater Treatment Plant is the third largest Wastewater Treatment Plant (WWTP) in the state of Colorado. The plant receives sewage from the cities of Englewood and Littleton, as well as from 19 connector districts in the service areas of the cities. The plant is a large, advanced treatment plant required to exceed secondary treatment requirements and remove ammonia from wastewater. The design capacity is 50 million gallons per day (mgd) and is presently treating 23 mgd. The biological treatment process consists of trickle filter/ solids contact facility with post nitrification and post denitrification capabilities. The facility is required to exceed secondary treatment requirements and remove ammonia from wastewater before discharging into the South Platte River.
ORP Monitoring System
27 Images courtesy of Greg Farmer
YSI - ORP
Chloramine Disinfection Control System
Maintain 1.5 mg N/L ammonia to stay out of breakpoint Maintain Final Effluent E.coli < 126 #/100ml
ORP / Ammonium Monitoring System
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Tips for Trouble-Free Operation
Redundant sensors Plant Operators Maintain Instruments (Analyzer Task Force) • Cleaning • Calibration • Parts replacement • Tracked through Asset Management
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1 mole Ammonia (NH3 / NH4
+)
1 mole Nitrite (NO2
-)
1 mole Nitrate (NO3
-)
1 mole Nitrite (NO2
-)
1/2 mole Nitrogen gas (N2)
75% O2
25% O2 40% Carbon
60% Carbon
Aerobic Anoxic
Nitrogen Removal by (Biological) Denitrification
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26th Ward WWTP Brooklyn, NY
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Control Strategy
Effluent TN (mg N/L)
Carbon (gal / yr)
Annual Carbon Cost Savings
Constant 6.3 / 7.5 960,000 $2,387,000 $427,000
Feed Forward 6.4 / 7.9 789,200 $1,962,000
Presenter
Presentation Notes
The 26th Ward has a design capacity of 85 mgd that discharges into Jamaica Bay. New York City’s 14 wastewater treatment plants together treat 1.3 billion gallons of wastewater daily. The treatment process is requried to remove nitrogen to relieve hypoxia and eutrophication of Long Island Sound. A $2 million dollar nitrogen removal facility was recently completed that will reduce discharges of nitrogen by 3,000 lbs./day. It is also a centralized solids handling facilities handling the solids from multiple other NYC facilities. In fact, 1 treatment train is dedicated to treatment of ammonia-rich dewatering centrate.
Nitrate Monitoring System
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Nitrate Monitoring System
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Presenter
Presentation Notes
Probe locations Beginning of B-pass anoxic zone; beginning of C-pass anoxic zone; end of D-pass anoxic
Carbon Dosing Control System
Glycerol Dosage based on nitrate load entering anoxic zone (Feed Forward)
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C
C
C
Tips for Trouble-Free Operation
Low nitrate - Optical (NitraVis); High nitrate - ISE (NitraLyt) Air cleaning to dislodge hair/rags (optical nitrate)
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Acknowledgements
Rick Wenzel – City of Brookfield, WI FRWPCC Doug Nolkemper – Johnson County Wastewater Marc Pedrotti – R.E. Pedrotti Company Gene Connell – Missoula WWTP Greg Farmer – Littleton-Englewood WWTP Jim Hampson – North East Technical Sales David Fulcher – YSI Integrated Systems & Services
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Case Studies & Solutions
Look for YSI Wastewater Newsletter before WEFTEC Web version available: http://bit.ly/IQcasestudies
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Questions?
Web - www.ysi.com/wastewater Slideshare – www.slideshare.net/YSIinc YouTube – www.youtube.com/YSIinc Blog – www.ysi.com/blog Phone: 1-800-897-4151 Email: [email protected] or [email protected]
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