mwc.txt

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Municipal Waste Combustors
March 1995

                    Technical Disclaimer

References to abatement technologies are not intended to
represent minimum or maximum levels of Best Available Control
Technology (BACT).  Determinations of BACT are made on a case
by case basis.  BACT determinations are always subject to
adjustment in consideration of specific process requirements,
air quality concerns and recent developments in abatement
technology.  Additionally, specific health effect concerns may
indicate stricter abatement than required by the BACT
determination.

The represented calculation methods are intended as an aid in
the completion of acceptable permit applications; alternative
calculation methods may be equally acceptable if they are
based upon, and adequately demonstrate, sound engineering
assumptions or data.

These guidelines are applicable as of the date of this
document, but are subject to revision during the permit
application preparation and review period.  It is the
responsibility of the applicants to remain abreast of any
guideline or regulation developments which may affect their
industries.

TNRCC Rule 116.111(3) in Regulation VI requires that BACT be
applied to all facilities that must obtain a permit.  Current
BACT guidelines for municipal waste combustors:  

Carbon Monoxide (CO)
50 ppmdv corrected to seven percent oxygen (O2)

Hydrogen Chloride (HCl)
Ninety-five percent reduction, weight or volume, or 25 ppmdv
corrected to seven percent O2, whichever is less stringent.

Opacity 
Five percent

Particulate Matter (PM)
0.015 grains per dry standard cubic foot (gr/dscf) corrected
to seven percent O2 dry.  Front-half only;
0.020 gr/dscf corrected to seven percent O2, front and back
half

Sulfur Dioxide (SO2)
Eighty percent reduction, weight or volume, or thirty ppmdv
corrected to seven percent O2, whichever is less stringent.

Operating Standards
Secondary Chamber - minimum 1800F and one to two seconds
retention time.  

Compliance and Performance Testing
Annual stack sampling for:  PM, dioxins/furans, HCl, trace
metals - antimony, arsenic, barium, beryllium, cadmium,
chromium, iron, lead, mercury, manganese, nickel, selenium,
silver, titanium, vanadium and zinc.  

Continuous Emissions Monitoring Systems (CEMS)
CO, opacity, O2 (possibly NOx and SO2)

These levels are guidelines to help the applicant get an idea
of what the TNRCC currently considers BACT.  Please call and
talk to a combustion section permit engineer at 512-239-1250
to discuss the specifics of your project.