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INDUSTRIAL DISCHARGRES

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Toxic Reduction and Control (TRAC) of MWRA oversees the industries in the MWRA ... TRAC issues Discharge Permits to over 1100 companies that discharge process ... – PowerPoint PPT presentation

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Title: INDUSTRIAL DISCHARGRES


1
INDUSTRIAL DISCHARGRES
  • Indrani Ghosh

2
Industrial Discharge as an Outflow
Outflows from Watershed
Industrial Water Discharges
Storm water Discharges
Sewage Water Discharges
3
Industrial Discharge
  • Toxic Reduction and Control (TRAC) of MWRA
    oversees the industries in the MWRA service areas
    (North, Central and South)
  • To reduce and regulate toxic discharges at their
    source, TRAC administers MWRA's Industrial
    Pretreatment Program under the Clean Water Act.
  • An Industrial Coordinator for each service area
    along with his team of Sampling Associates is
    responsible for monitoring the discharge of
    industrial facilities in their region.
  • TRAC issues Discharge Permits to over 1100
    companies that discharge process industrial
    wastewater to the sewer system.
  • There are different categories of permits issued
    for different industries. For example,
  • Industrial Laundry Category 1
  • Research and Development Laboratory Category 2

4
Data Acquired from MWRA
  • MWRA has monitoring stations at different
    industrial sites in the different towns
  • There is a facility ID for each monitoring
    station and there are location IDs for the
    different towns
  • There are specific days on which the MWRA
    measures/monitors industrial discharge from
    specific facilities.
  • Hence the discharge data available was not on a
    monthly basis, unlike the storm and sewage
    outflows. These were randomly collected on
    different days of the year.
  • Some industries like Beckton Dickinson, Inc. had
    their discharges recorded for 160 days in the
    year 2002, while facilities near different CVS
    outlets discharges were recorded just once a year.

5
Managing the Data and Calculations
  • Approximately 3400 industrial discharge records
    were obtained from MWRA for
  • seven towns located within our watershed.
  • All the data available were first sorted by names
    of industries.
  • Different industries/commercial institutions had
    different numbers of records for the year 2002,
    as obtained from MWRA.
  • The subtotal function was used to calculate the
    average discharge values for each of these
    industries, measured in gallons per day.
  • The sum of all these averages was taken to
    determine the total industrial discharge from all
    seven towns.
  • This number was then multiplied by the ratio
    AT,LCR/AT,Total to get the actual industrial
    discharge from the watershed, in gallons per day.
  • This was converted to a total annual estimate and
    then normalized over the whole area of the
    watershed to get the final value.
  • We arrived at an annual estimate of 0.29 in. of
    industrial waste water discharging out of the
    watershed for the calendar year 2002.

6
Top 10 Average Annual Industrial Discharges
7
Comments and Conclusions
  • We assumed that all the industries discharged
    wastewater for all the 365 days of the year,
    which might not be true. Some commercial
    institutions like the CVS remain open 7 days a
    week, while the Wyeth Research Division of
    Pharmaceuticals remains closed over the weekends.
  • Since an average daily flow for each of the
    industries was used from the records that were
    available, we assumed that the industries
    discharge wastewater at the same rate all the
    year round. This might not be true always. For
    example, some of the research laboratories may
    discharge at lower rates over the weekends than
    on working days.
  • The annual estimate could have been a more
    accurate had the daily or monthly discharge data
    from all the industries been available.
  • The sum of the annual storm, sewage and
    industrial discharges from the watershed is
    estimated at 36.75 in. of which industrial
    discharge is 0.29 in., only approximately 0.8 of
    the total.
  • Hence, it is unlikely that the above errors or
    limitations in calculating this component will
    affect the total budget to any considerable
    extent.
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