Energy Saving OpportunitiesEnergy Saving Opportunities

In LagoonsIn Lagoons

MM S l iS l i EDIEDIMarc Marc SalmiSalmi, EDI, EDI

MWEA Lagoon SeminarMWEA Lagoon Seminar

February 2010February 2010yy

LagoonsLagoonsLagoonsLagoons•• Earthen Reactor with Sloped WallsEarthen Reactor with Sloped WallsEarthen Reactor with Sloped WallsEarthen Reactor with Sloped Walls

Why Lagoons?Why Lagoons?Why Lagoons?Why Lagoons?•• Benefits of LagoonsBenefits of LagoonsBenefits of LagoonsBenefits of Lagoons

–– Minimum Operations SupportMinimum Operations SupportNo Reg lar Solids ManagementNo Reg lar Solids Management–– No Regular Solids Management No Regular Solids Management

–– Process StabilityProcess StabilityA bl T C bili i (30/30A bl T C bili i (30/30–– Acceptable Treatment Capabilities (30/30 Acceptable Treatment Capabilities (30/30 BOD/TSSBOD/TSS--mg/l)mg/l)C Eff i i h A il bl L dC Eff i i h A il bl L d–– Cost Effective with Available LandCost Effective with Available Land

Typical Lagoon HierarchyTypical Lagoon HierarchyTypical Lagoon HierarchyTypical Lagoon Hierarchy

•• Stabilization/FacultativeStabilization/Facultative•• Stabilization/FacultativeStabilization/Facultative–– 6060--90 days HRT (high land demand)90 days HRT (high land demand)

Non Aerated (low operating cost)Non Aerated (low operating cost)–– Non Aerated (low operating cost)Non Aerated (low operating cost)

–– Typically Shallow so Algae Can Be Typically Shallow so Algae Can Be ProblematicProblematic

–– 45/70 Effluent45/70 Effluent

Typical Lagoon HierarchyTypical Lagoon HierarchyTypical Lagoon HierarchyTypical Lagoon Hierarchy

•• Partial Mix AeratedPartial Mix Aerated–– 30 days HRT with 330 days HRT with 3--4 days Quiescent4 days Quiescent–– Multiple Zones (baffled or separate cells)Multiple Zones (baffled or separate cells)–– Aeration Technology Critical (surface mechanical Aeration Technology Critical (surface mechanical

vs. diffused aeration)vs. diffused aeration)vs. diffused aeration)vs. diffused aeration)–– 45/70 easy, 45/70 easy, 30/30 consistently30/30 consistently

(Utility average revenue per kwh by state Cents per kwh )(Utility average revenue per kwh, by state. Cents per kwh.)

Aeration DevicesAeration DevicesAeration DevicesAeration Devices

•• Types of DiffusersTypes of Diffusers •• MechanicalMechanical–– SS Coarse BubbleSS Coarse Bubble

–– Static TubesStatic Tubes

–– Perforated TubingPerforated Tubing

MechanicalMechanical–– JetsJets

–– Surface AeratorsSurface Aerators–– Snap CapsSnap Caps

–– Ceramic PlatesCeramic Plates

–– Ceramic TubeCeramic Tube

–– Submerged TurbinesSubmerged Turbines

–– Aspirating AeratorsAspirating Aerators

–– Ceramic DiscCeramic Disc

–– Fabric or Sock TypeFabric or Sock Type

–– Membrane DiscMembrane Disc

–– Membrane TubesMembrane Tubes

A r ti nA r ti nAeration Aeration Technology Technology gygyComparisonComparison

SAESAE(lb O2/hp(lb O2/hp--hr)hr)SAESAE(lb O2/hp(lb O2/hp--hr)hr)( p( p ))( p( p ))

High Speed Surface AeratorHigh Speed Surface AeratorHigh Speed Surface AeratorHigh Speed Surface Aerator

Environmental Dynamics Inc.

Aspirating AeratorsAspirating AeratorsAspirating AeratorsAspirating Aerators

Perforated TubingPerforated TubingPerforated TubingPerforated Tubing

Static TubesStatic TubesStatic TubesStatic Tubes

Static TubesStatic TubesStatic TubesStatic Tubes

Submerged Piping SystemsSubmerged Piping SystemsSubmerged Piping SystemsSubmerged Piping Systems

LAGOON SUBMERGEDLAGOON - SUBMERGED

Floating Piping SystemsFloating Piping SystemsFloating Piping SystemsFloating Piping Systems

Partial Mix and Quiescent ZonesPartial Mix and Quiescent ZonesPartial Mix and Quiescent ZonesPartial Mix and Quiescent Zones

Air Release UniformityAir Release Uniformity

Good

Air Release UniformityAir Release Uniformity

GoodPoorPoor

Michigan Energy SaversMichigan Energy SaversMichigan Energy SaversMichigan Energy Savers

•• BessemerBessemer

•• GraylingGrayling

•• 421 421 kwhkwh/mg/mg

•• 636636 kwhkwh/mg/mgGraylingGrayling

•• Markey TownshipMarkey Township

•• ElsieElsie

636 636 kwhkwh/mg/mg

•• 1053 1053 kwhkwh/mg/mg

•• 1600 1600 kwhkwh/mg/mg

•• LudingtonLudington

•• ShelbyShelby

•• 2080 2080 kwhkwh/mg/mg

•• 3174 3174 kwhkwh/mg/mg

Blower SelectionBlower SelectionBlower SelectionBlower Selection

•• RegenerativeRegenerative•• RegenerativeRegenerative

––Low Cost, low pressure, low airflow, Low Cost, low pressure, low airflow, low dollarlow dollar

•• Positive DisplacementPositive DisplacementPositive DisplacementPositive Displacement

––Moderate cost, efficiency 50Moderate cost, efficiency 50--65%65%

•• CentrifugalCentrifugal

––Higher Cost, better efficiency 55Higher Cost, better efficiency 55--75%75%Higher Cost, better efficiency 55Higher Cost, better efficiency 55 75%75%

•• TurboTurbo

Ad d TAd d TAdvanced TreatmentAdvanced Treatment

Cold Weather NitrificationCold Weather Nitrification

Lagoon Lagoon UpgradeTechnologiesUpgradeTechnologiesUpgradeTechnologiesUpgradeTechnologies

Environmental Dynamics Inc

Lagoon UpgradesLagoon UpgradesLagoon UpgradesLagoon Upgrades

•• Suspended Suspended GrowthGrowthpp–– Complete Mix with Solids RecoveryComplete Mix with Solids Recovery

•• External ClarifiersExternal ClarifiersI l Cl ifiI l Cl ifi•• Internal ClarifiersInternal Clarifiers

•• Internal Internal SeparatorsSeparators•• Intermittent Intermittent AerationAeration

/Decant/Decant

•• Thermal CoversThermal Covers•• External Heat SourceExternal Heat Source

Environmental Dynamics Inc

Energy Reduction SummaryEnergy Reduction SummaryEnergy Reduction SummaryEnergy Reduction Summary

•• Cost of Energy IncreasingCost of Energy IncreasingCost of Energy IncreasingCost of Energy Increasing

•• Energy Reduction 40Energy Reduction 40--70% Possible70% Possible

O li C iO li C i•• Online ConversionsOnline Conversions

•• Increased Operating FlexibilityIncreased Operating Flexibility

•• Multiple Options for BlowersMultiple Options for Blowers

•• Advance Treatment AvailableAdvance Treatment AvailableAdvance Treatment AvailableAdvance Treatment Available

TTThank You!!Thank You!!

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