instrumentation for wasttewatter

8/8/2019 Instrumentation for Wasttewatter

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Instrumentation for WastewaterInstrumentation for Wastewater

Treatment Plant OperationTreatment Plant Operation

Jim RadneyJim Radney

Cerlic Environmental ControlsCerlic Environmental Controls

Atlanta, GAAtlanta, GAwww.cerlic.comwww.cerlic.com


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Typical Wastewater Treatment PlantTypical Wastewater Treatment Plant

PlugPlug--Flow DesignFlow Design


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Application PointsApplication Points

Lift StationLift Station

InfluentInfluent

Primary ClarifierPrimary Clarifier

Aeration Basin / DitchAeration Basin / Ditch

Secondary ClarifierSecondary Clarifier

Final EffluentFinal Effluent Sludge Centrifuge / Belt Press / Screw PressSludge Centrifuge / Belt Press / Screw Press


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InstrumentationInstrumentation

Suspended SolidsSuspended Solids

TurbidityTurbidity

Dissolved OxygenDissolved Oxygen

ORP (Oxidation/Reduction Potential)ORP (Oxidation/Reduction Potential)

Sludge Blanket MonitorsSludge Blanket Monitors

pHpH Flow MeasurementFlow Measurement


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Suspended Solids MeasurementSuspended Solids Measurement

MeasurementMeasurement

Primary Clarifier Influent / Effluent / SludgePrimary Clarifier Influent / Effluent / Sludge

MLSSMLSSAeration Basin / SBR / Ditch / MBRAeration Basin / SBR / Ditch / MBR

RAS (Return Activated Sludge) / WASRAS (Return Activated Sludge) / WAS

Secondary Clarifier EffluentSecondary Clarifier Effluent

Final Effluent (TSS)Final Effluent (TSS)

Tertiary Filter BackwashTertiary Filter Backwash

Sludge Press / CentrifugeSludge Press / CentrifugeFiltrate /Filtrate / CentrateCentrate

Laboratory TestingLaboratory Testing


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Suspended Solids Measurement forSuspended Solids Measurement for

Biological Process ControlBiological Process Control

MLSS & RAS MeasurementMLSS & RAS MeasurementAbility to Manage BugAbility to Manage Bug

Population & Obtain Constant SRT (Solids Retention Time) inPopulation & Obtain Constant SRT (Solids Retention Time) inAeration Basin or Ditch SystemsAeration Basin or Ditch Systems

Three Methods of RAS ControlThree Methods of RAS Control

1.1. Constant RAS FlowConstant RAS Flow

2.2. Paced RAS Proportional to Influent flowPaced RAS Proportional to Influent flow

Waste on Volume or FlowWaste on Volume or Flow

3.3. Maintain Constant MLSS with Suspended Solids Meters onMaintain Constant MLSS with Suspended Solids Meters on

MLSS & RASMLSS & RAS Waste on Pounds rather than volumeWaste on Pounds rather than volume

RAS Concentration x Flow = Pounds of BugsRAS Concentration x Flow = Pounds of Bugs


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Advanced SRT ControlAdvanced SRT Control --

Get Control of your BugsGet Control of your Bugs

WAS

MLSS

RAS ~6000 mg/l

50 to

200 mg/l

Aeration Basin

~3000 mg/l SecondaryClarifier

0-20 mg/l

Blanket

Monitor

Monitor MLSS & RAS to:

Automatically control Wasting (WAS)

Keep your MLSS constant

Monitor Blanket Levels:

Prevent Washouts

TSS

Meter

TSS

Meter


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Type 2Type 2Paced RAS/InfluentPaced RAS/InfluentDiurnal Changes

High Flow

Low Flow


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Type 3Type 3 -- MLSS with Plant FlowMLSS with Plant Flow

MLSS Remains Constant with Changing Influent Flow

MLSS

Influent Flow


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Additional Suspended SolidsAdditional Suspended Solids

Measurement Application PointsMeasurement Application Points

Final Effluent MeasurementFinal Effluent MeasurementRealReal--TimeTime

Information about TSS DischargeInformation about TSS Discharge

CentrateCentrate & Filtrate Monitoring for Polymer& Filtrate Monitoring for Polymer

ControlControl Reduction of Laboratory TestingReduction of Laboratory TestingTimeTime

SavingsSavings

RealReal--time data vs. One Sample / daytime data vs. One Sample / dayallowsallowsfor better process decisionsfor better process decisions


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How A TSS Meter WorksHow A TSS Meter Works

Light Source LED 880nm (NIR)Light Source LED 880nm (NIR)

Detect Particles > 0.44Detect Particles > 0.44mm

LED Flashed with High EfficiencyLED Flashed with High Efficiency

Measures solids through 15 or 20 mm gapMeasures solids through 15 or 20 mm gap

Zero Calibrate in Clean WaterZero Calibrate in Clean Water

LEDRef detector Transmission detector

T Temperature

Compensation

Loop


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Ohio Suspended Solids UsersOhio Suspended Solids Users

Beaver Creek

New Miami

Little Miami

Tri Cities - Dayton

Fairborn

Fremont

MillersburgNewark

Newark WTP

Wilmington

Alpine Cheese

Wooster


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TSS Meter Mounting TypesTSS Meter Mounting Types


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Secondary Clarifier EffluentSecondary Clarifier Effluent

High Flow

Low Flow


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Clarifier Effluent TroughClarifier Effluent Trough


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Suspended Solids vs. TurbiditySuspended Solids vs. Turbidity

WWTPWWTP

Suspended SolidsSuspended Solids Designed for WWTPDesigned for WWTP

Solids in WaterSolids in Water

NOT effected by colorNOT effected by color Unit of measurementUnit of measurement

mg/l,mg/l,ppmppm, or %, or %

Light TransmissionLight Transmission

WTPWTP

TurbidityTurbidity Designed for WTPDesigned for WTP

Opaque (cloudiness) inOpaque (cloudiness) in

waterwater Effected by dissolvedEffected by dissolved

solids and color of liquidsolids and color of liquid

Unit of measurementUnit of measurement

NTUNTU

Light ReflectionLight Reflection


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TSS vs. Turbidity (NTU)TSS vs. Turbidity (NTU)

Example of color change causing turbidity to overshoot

Turbidity

Suspended Solids


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Automatic CleaningAutomatic Cleaning

Air or water flush


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Dissolved OxygenDissolved Oxygen


Aeration Basin / DitchAeration Basin / Ditch Final EffluentFinal Effluent

DO Concentration must be sufficient to sustain bugsDO Concentration must be sufficient to sustain bugs

Low / High DO levels can cause settling issuesLow / High DO levels can cause settling issues

Low DO levels can promote filamentous bacteriaLow DO levels can promote filamentous bacteria

growthgrowth

Too High DO levelToo High DO levelWasting EnergyWasting Energy


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DO Trial ResultsDO Trial Results


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DODOManual vs. AutomaticManual vs. Automatic

Automatic Control


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ORPORP

(Oxidation/Reduction Potential)(Oxidation/Reduction Potential)


Aeration Basin / DitchAeration Basin / Ditch Final EffluentFinal Effluent

Can be used inCan be used in DenitrificationDenitrification StepStepto determine ifto determine if

Anoxic / Anaerobic Condition PresentAnoxic / Anaerobic Condition Present Used for Chlorine Residual MeasurementUsed for Chlorine Residual Measurementmeasuresmeasures

the oxidative ability of the chlorinethe oxidative ability of the chlorine

Can be used in Low DO level applicationsCan be used in Low DO level applications

Flushing SuggestedFlushing SuggestedAir or WaterAir or Water


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DenitrificationDenitrification ---- ORPORP


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pHpH MeasurementMeasurement

InfluentInfluent Influent to Primary ClarifierInfluent to Primary Clarifier

Aeration Basin / SBR / DitchAeration Basin / SBR / Ditch

Raw Wastewater/InfluentRaw Wastewater/Influent

Approximately pH=7Approximately pH=7

Any Deviations typically indicates industrial or otherAny Deviations typically indicates industrial or otherNonNon--Domestic DischargesDomestic Discharges

Anaerobic ConditionsAnaerobic ConditionspH decreasespH decreases

Bugs Only Active between 6.5 and 8.0Bugs Only Active between 6.5 and 8.0

Flushing SuggestedFlushing SuggestedAir due to influent greaseAir due to influent grease


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Sludge Blanket MonitorSludge Blanket Monitor MeasurementMeasurement

Primary & Secondary ClarifierPrimary & Secondary Clarifier Sludge ThickenerSludge Thickener

Sludge JudgeSludge Judge

Optical MeasurementOptical Measurement

UltrasonicUltrasonic

Blanket Measurement to Prevent WashoutsBlanket Measurement to Prevent Washouts

One Measurement for SRT ControlOne Measurement for SRT ControlCan be used toCan be used to

do Mass Balancedo Mass Balance


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Sludge Blanket Monitor InstallationSludge Blanket Monitor Installation

TSS Sensor with Motor and Limit Switch

Ultrasonic


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Rising Blanket LevelRising Blanket Level

Wasted a large

amount of WAS


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ClarifierClarifier


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Flow MeasurementFlow Measurement


Pressure Transducers w/ FlumesPressure Transducers w/ Flumes

Magnetic (Magnetic (MagMag)) FlowmetersFlowmeters

UltrasonicUltrasonic MechanicalMechanicalVein or Paddle WheelVein or Paddle Wheel


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Ditch StyleDitch Style Aeration SystemAeration System

Complete MixComplete Mix


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Sequential Batch Reactor (SBR)Sequential Batch Reactor (SBR)

WAS

Effluent

Influent

100- 500 mg/l

0-30 mg/l

Decant Level

DO & Temp MLSSpH

TSS

TSS


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Typical Wastewater Treatment PlantTypical Wastewater Treatment Plant

PlugPlug--Flow DesignFlow Design


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R.L. Sutton WRFR.L. Sutton WRFCobb County GACobb County GA

60 MGD60 MGDStartStart--up 12/04up 12/04


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Instrumentation for WastewaterInstrumentation for Wastewater

Treatment Plant OperationTreatment Plant Operation

Jim RadneyJim Radney

Cerlic Environmental ControlsCerlic Environmental Controls

Atlanta, GAAtlanta, GAwww.cerlic.comwww.cerlic.com

instrumentation for wasttewatter

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