Industrial Wastewater Pretreatment

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Industrial Wastewater Pretreatment

• Joseph Cerrone-Permit Administrator
• Philadelphia Water Department
• Industrial Waste Unit

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Industrial Wastewater Pretreatment

• Definitions
• PWDS Pretreatment Program
• Types of Sewer Systems
• POTW Tour

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Defining Terms

• CWA (1977)
• POTW
• NPDES
• OCPSF

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POTW

• Publicly Owned Treatment Works

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SURCHARGE

• SUSPENDED SOLIDS (SS)
• BIOLOGICAL OXYGEN DEMAND (BOD)

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CATEGORICAL

• Of or relating to a category or categories.

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CATEGORICAL

• Electroplating
• OCPSF Chemical Manufacturing
• Metal finishing
• Laundry

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LOCAL LIMITS

• Pretreatment parameters imposed by the POTW.
• May be more strict than the Federal parameters
  but not less strict.

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OUTFALL

• The Point of Discharge for a Sewer.

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Industrial Pretreatment

• Company fills out a BMR.
• Permit is written to reflect wastewater
  discharge.
• Permit is administered

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TO WHOM DOES PRETREATMENT APPLY ?

• Any contributor with the potential to discharge a
  harmful material or a compatible material in
  amounts that could overwhelm the treatment
  process.

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What does a permit look like?

• Part I -
• Process Description
• Identifying Information
• Details of Process Point(s) of Discharge
• Applicable Local and Federal Categorical Limits

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What does a permit look like?

• Part II
• Listing of Limits

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What does a permit look like?

• Part III
• Monitoring Requirements

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What does a permit look like?

• Part IV - Standard Conditions
• Reporting Formats
• Spill Prevention Requirements
• Certification Requirements

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Why Have Pretreatment?

• Protect Investment in Physical Plant
• System for Pollution Reduction
• Federal Law Requires Plants gt5 MGD to
• Meet Basic Federal Standards
• Obtain Federal Approval

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Guadalajara, Mexico

• April, 1992
• Combustible Solvent
• Sewer System Explosion
• Test L.E.L. Before Opening Manholes

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HOW ARE PERMITS ADMINISTERED ?

• Periodic Inspections
• Independent Sampling
• Review Formal Spill Plans

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HOW ARE PERMITS ADMINISTERED ?

• Evaluation of User Reports
• Sampling
• Analytical Data
• Off Site Disposal

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Representative Samples

• ISCO Automatic Sampler
• Computer controlled
• Time or Flow Proportioned Samples
• Discrete or Composite Samples

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HOW ARE PERMITS ADMINISTERED ?

• Notice of Violation - NOVs
• Late Reports
• Failed Sampling Results
• Exceedance of Numerical Pollution Limits

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HOW ARE PERMITS ADMINISTERED ?

• Fines Imposed - According to Published
  Enforcement Response Plan
• Corrective Action Plans - To Bring Industries
  into Compliance

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Types of Sewer Systems

• Combined.
• Separate.

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Combined Sewer Systems

• One Sewer in the street.
• Contains both sewage rainwater runoff.
• Rain event results in discharge to receiving
  stream..

Portable Tank
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Separate Sewer systems

• Two sewers in the street
• Sanitary sewer.
• Storm sewer.

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CONFINED SPACE ENTRY CONSIDERATIONS

• LOWER EXPLOSIVE LIMIT (LEL)
• HYDROGEN SULFIDE (H2S)
• OXYGEN LEVEL (21)
• FALL PROTECTION

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POTW Tour

• N. E. Waste Water Treatment Plant
• 3895 Richmond Street

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Bar Screen

• Prevents Pump Damage
• Removes Coarse Debris
• Rake Cleans Screen Periodically
• Debris Sent to Landfill

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Large Capacity Pumps

• 45 Lift
• 210 MGD
• Constant Variable Speed
• Diurnal Cycle

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Detritus Basins

• Slows Velocity
• 55 Diameter
• Removes Inorganic Particles (Grit)

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Detritus Basin

• Grit Falls to Bottom
• Screw Conveyor Transport
• To Landfill

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Primary Sedimentation Tanks

• Organic Sludge Drops to Bottom
• Sludge to Digesters
• Grease Floats

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Aeration Tank

• Enhances Bacterial Growth Action

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Final Sedimentation

• Final Polishing
• Removes More Organic Solids

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Alternatives to Pretreatment