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Industrial Wastewater Pretreatment

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Industrial Wastewater Pretreatment – PowerPoint PPT presentation

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Title: Industrial Wastewater Pretreatment


1
Industrial Wastewater Pretreatment
  • Joseph Cerrone-Permit Administrator
  • Philadelphia Water Department
  • Industrial Waste Unit

2
Industrial Wastewater Pretreatment
  • Definitions
  • PWDS Pretreatment Program
  • Types of Sewer Systems
  • POTW Tour

3
Defining Terms
  • CWA (1977)
  • POTW
  • NPDES
  • OCPSF

4
POTW
  • Publicly Owned Treatment Works

5
SURCHARGE
  • SUSPENDED SOLIDS (SS)
  • BIOLOGICAL OXYGEN DEMAND (BOD)

6
CATEGORICAL
  • Of or relating to a category or categories.

7
CATEGORICAL
  • Electroplating
  • OCPSF Chemical Manufacturing
  • Metal finishing
  • Laundry

8
LOCAL LIMITS
  • Pretreatment parameters imposed by the POTW.
  • May be more strict than the Federal parameters
    but not less strict.

9
OUTFALL
  • The Point of Discharge for a Sewer.

10
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11
Industrial Pretreatment
  • Company fills out a BMR.
  • Permit is written to reflect wastewater
    discharge.
  • Permit is administered

12
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.

13
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

14
What does a permit look like?
  • Part II
  • Listing of Limits

15
What does a permit look like?
  • Part III
  • Monitoring Requirements

16
What does a permit look like?
  • Part IV - Standard Conditions
  • Reporting Formats
  • Spill Prevention Requirements
  • Certification Requirements

17
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

18
Guadalajara, Mexico
  • April, 1992
  • Combustible Solvent
  • Sewer System Explosion
  • Test L.E.L. Before Opening Manholes

19
HOW ARE PERMITS ADMINISTERED ?
  • Periodic Inspections
  • Independent Sampling
  • Review Formal Spill Plans

20
HOW ARE PERMITS ADMINISTERED ?
  • Evaluation of User Reports
  • Sampling
  • Analytical Data
  • Off Site Disposal

21
Representative Samples
  • ISCO Automatic Sampler
  • Computer controlled
  • Time or Flow Proportioned Samples
  • Discrete or Composite Samples

22
HOW ARE PERMITS ADMINISTERED ?
  • Notice of Violation - NOVs
  • Late Reports
  • Failed Sampling Results
  • Exceedance of Numerical Pollution Limits

23
HOW ARE PERMITS ADMINISTERED ?
  • Fines Imposed - According to Published
    Enforcement Response Plan
  • Corrective Action Plans - To Bring Industries
    into Compliance

24
Types of Sewer Systems
  • Combined.
  • Separate.

25
Combined Sewer Systems
  • One Sewer in the street.
  • Contains both sewage rainwater runoff.
  • Rain event results in discharge to receiving
    stream..

Portable Tank
26
Separate Sewer systems
  • Two sewers in the street
  • Sanitary sewer.
  • Storm sewer.

27
CONFINED SPACE ENTRY CONSIDERATIONS
  • LOWER EXPLOSIVE LIMIT (LEL)
  • HYDROGEN SULFIDE (H2S)
  • OXYGEN LEVEL (21)
  • FALL PROTECTION

28
POTW Tour
  • N. E. Waste Water Treatment Plant
  • 3895 Richmond Street

29
Bar Screen
  • Prevents Pump Damage
  • Removes Coarse Debris
  • Rake Cleans Screen Periodically
  • Debris Sent to Landfill

30
Large Capacity Pumps
  • 45 Lift
  • 210 MGD
  • Constant Variable Speed
  • Diurnal Cycle

31
Detritus Basins
  • Slows Velocity
  • 55 Diameter
  • Removes Inorganic Particles (Grit)

32
Detritus Basin
  • Grit Falls to Bottom
  • Screw Conveyor Transport
  • To Landfill

33
Primary Sedimentation Tanks
  • Organic Sludge Drops to Bottom
  • Sludge to Digesters
  • Grease Floats

34
Aeration Tank
  • Enhances Bacterial Growth Action

35
Final Sedimentation
  • Final Polishing
  • Removes More Organic Solids

36
Alternatives to Pretreatment
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