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Advanced Wastewater Treatment and

Disposal Systems

Water and Wastewater Utility Operation and


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Treatment System

• Preliminary Treatment

•

• Secondary Treatment

• Disinfection•


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Preliminary Treatment

• Screening

• Remove Lar e Solids

• Parallel Bars Placed inChannel

• Course Screen (2-4

Inch Range)copyright 2008 – 2009 www.infobarscreens.com

• Fine Screen (0.75-2.0

Inch Range)

• Manual or Mechanical


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• Gravity/Velocity

Removal

• Cyclone Degritter


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• Inspect Periodically to

Ensure Screen is Free

of Obstructions• Replace Hydraulic Fluid

if Necessary

• Oil Change/ChecksShould Be Done on an

Annual Basis

• spose o creen ngsat an Approved


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Primary Treatment

• s

City of Hagerstown, Utilities Department


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FOG Management

Manage Fats, Oils,

and Grease at the

Source

Source: htt ://www.oracwa.or

– Commercial and Industrial Facilities

– Management plan in place for frequent pumping

based on loading – Tank pumping by grease hauler or septic tank

– Recordkeeping


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Rotating Biological C


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procedures that should be performed after

3 months of startu of an RBC s stem.


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SBR

http://www.epa.gov/nrmrl/pubs/625r00008/html/tfs3.htm


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SBR

http://www.cee-environmental.com


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SBR

Basic Maintenance Needs

•

• Adjust cycle times to meet treatment goals

’


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Activated Sludge


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Activated Sludge

ower w t r p ng


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Activated Sludge

• Daily Operation Checks:

–

– Equipment Operation and Lubrication

–

– Hose Down Accumulated Sludge From

– Brush Weirs to Remove Algae and

– Skim Off Grease and Other Floating


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Activated Sludge

• Wasting Sludge:

–

Effluent Quality – -

Week During Summer To Prevent

Excessive Solids Burping – Measuring MLSS in Aeration Tank

>Laborator E ui ment

>Jar Test


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What is white fluffy foam in the aeration

chamber a sign of?

Copyright © 2003. Environmental Leverage Inc.


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chamber a sign of?

Copyright © 2003. Environmental Leverage Inc.


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Oxidation Ditch


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Oxidation Ditches

• Control Methods Similar to Activated

Sludge Process:

– Food Supply

– Dissolved Oxygen Levels (DO)

– c nv ronmen

– Ditch Detention Time

–

Copyright © Williams Industrial Services LtdCopyright © Jewett City WWTP, CT


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Oxidation Ditches

• Food Supply for Microorganisms:

– Measured as Biological Oxygen Demand (BOD)

– No Toxicants

– Proper Pretreatment Facility Inspection


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Oxidation Ditches

• DO Levels:

– Rotors Supply Oxygen to Waste Flow

– Maintain DO Concentration of 0.5 To 2.0 Mg/L

Upstream of Rotors

–

– Control of Rotor Oxygenation by Adjusting Outlet

Control Weir

Copyright 2010 © Spaans Babcock

Copyright © 2004 by City of Princeton


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Membrane Bioreactors

Reactor Basin

Permeate Pumps

ermea e umpsReactor Basin

© Infrastructure Alternatives Inc.2007© Infrastructure Alternatives Inc.2007


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Membrane Bioreactors

• Monitor Trans Membrane Pressure (TMP)

•Solution (0.5%)

• Cleaning Typically 2-4 Hours

• Once Every 6 Months


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Train 1 Train 2

Influent To Anerobic TankTo Anerobic Tank

Anoxic Tank, Mixin &

Carbon Addition

Blowers

Aeration

Membrane

Permeate Pumps

(Under Vacuum)RAS RAS

Effluent to UV Sludge Wasting


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Treated Effluent Disposal

• Return Treated Effluent to Environment

–

– Reclaimed Water Use – Land Disposal


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• Caution needed to prevent heavy

e ui ment above facilities not desi ned to

take the weight


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• Regular removal of vegetation in open soil

beds re uired

• Be careful not to compact soils


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Sludge Disposal

• Major Problem facing Operators

•

– Bar Racks – Screens

– Grit Removal

– Aerobic Processes – Anaerobic Processes


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Sludge Disposal

• Disposal Options:

–

– Direct Burial – Incineration

– Composting

– Land Application


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Sludge Disposal

• Removing Wasted

Slud e:

– Pumper Truck Removal – Aerobic Digester

– Portable Pumping Unit

– Drying Beds Copyright © 2010 ITT Water & Wastewater

Copyright © ECO Friendly SheltersCopyright © 2009 Color Bold


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What Have We Learned?

• Components of Wastewater Treatment

Facilities

• Typical Treatment Systems Used in Larger

ac es

• Common O&M Issues

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