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Filter Backwash Recycling Rule

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Filter backwash recycle reintroduces contaminants back into the treatment process ... Recycle streams are source of high concentration of microbial pathogens and ... – PowerPoint PPT presentation

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Title: Filter Backwash Recycling Rule


1
Filter Backwash Recycling Rule
  • FBRR

Final June 8, 2001
2
Background
  • Filter backwash recycle reintroduces contaminants
    back into the treatment process
  • 1996 SDWA Amendments require EPA to promulgate a
    regulation that governs recycle of filter
    backwash water within a treatment plant

3
Purpose of FBRR
  • Recycle streams are source of high concentration
    of microbial pathogens and chemical contaminants
  • Contribute to the contaminant load
  • Coagulant chemistry imbalance
  • Hydraulic surge--overwhelms plants unit
    processes
  • Waste flows may adversely affect plant
    performance and, subsequently, pathogen removal

4
Purpose of FBRR
  • FBRR reduces potential for Cryptosporidium
    oocysts to pass through filters into finished
    water by ensuring proper management of residual
    streams
  • FBRR also allows States to evaluate recycle
    practices and identify any potential problems.

5
Systems Covered by FBRR 141.76(a)
  • SW and GWUDI (Subpart H) systems that employ
    conventional or direct filtration and
  • Recycle one or more of the following
  • Spent filter backwash water
  • Thickener supernatant
  • Liquids from dewatering processes                 
                

6
Conventional Treatment Plant
7
Direct Filtration
8
What is Filter Backwash Water?
  • Resulting water pushed back through the filter in
    the cleaning process
  • Filter backwashing is an integral part of
    treatment plant operation

9
What is Thickener Supernatant? What are Liquids
from Dewatering Processes?
  • Thickener supernatant
  • The clear water that exits sedimentation basins
    and clarifiers after particles have been allowed
    to settle out
  • Liquids from dewatering processes
  • Dewatering processes remove water from waste
    solids sludge in order to reduce the solids
    volume to be disposed

10
Key Components
  • Submit data to State
  • Plant schematic
  • Plant and recycle flow rates
  • State-approved operating capacity of plant
  • Appropriate recycle return location
  • Through all processes of a
  • systems conventional and
  • direct filtration treatment
  • State-approved alternative
  • location
  • Maintain specific records

11
Notify State in Writing 141.76(b)
  • Notify State in writing by December 8, 2003, if
    system recycles
  • Notification must include
  • Plant schematic
  • Origin of all recycle flows
  • Hydraulic conveyance used to transport them
  • Location where they are recycled back into the
    plant
  • Flow data
  • Typical recycle flow (gpm)
  • Highest observed plant flow from previous year
    (gpm)
  • Design flow for treatment plant (gpm)
  • State-approved operating capacity   

12
Treatment Technique Requirement 141.76(c)
  • By June 8, 2004, must return recycle flow through
    either
  • Processes of conventional or direct filtration
    system
  • Alternative location approved by the State
  • If capital improvements are required to modify
    recycle location, must be completed no later than
    June 8, 2006

13
Recycle Return Location
14
Example 1
15
Example 2
16
Example 3
17
Recordkeeping by Systems 141.76(d)
  • Beginning June 8, 2004, the following info must
    be on file for review and evaluation by the State
  • Copy of recycle notification and information
    submitted to State
  • List of all recycle flows and frequency of return
  • Average and maximum
  • Backwash flow rate through filters
  • Duration of the filter backwash
  • process (minutes)

18
Recordkeeping by Systems 141.76(d)
  • Typical filter run length and written summary of
    how determined (headloss, turbidity, time)
  • Type of treatment provided for recycle flow
  • Data on
  • Physical dimensions of equalization and/or
    treatment units
  • Typical and maximum hydraulic loading rates
  • Type of treatment chemicals used and average dose
    and frequency of use
  • Frequency at which solids are removed from
    treatment units

19
Violations and Public Notification
20
State Primacy Requirements 142.12(b)(1)(2)
  • June 8, 2003 Final primacy applications due
    unless granted extension
  • June 8, 2005 Final primacy revision
    applications from States with approved extensions
    must be submitted

21
State Special Primacy Requirement
142.16(i)(1)(i)
  • States must have the proper rules and authority
    to use sanitary surveys, comprehensive
    performance evaluations (CPEs), other
    inspections, or other activities to evaluate
    recycle data maintained by systems and require
    modifications to recycle practices

22
Available FBRR Documents
  • Filter Backwash Recycling Rule A Rule Summary
    for Systems
  • Fact Sheet Filter Backwash Recycling Rule
  • Filter Backwash Recycling Rule A Quick
    Reference Guide
  • Filter Backwash Recycling Rule Technical Guidance
    Manual (under development)
  • Filter Backwash Recycling Rule Implementation
    Guidance

23
For More Information
  • www.epa.gov/safewater/filterbackwash.html
  • Safe Drinking Water Hotline 1-800-426-4791
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