this is hit or miss, we really need to find a central source of TDF emissions data.

Approximant breakdown of Tires

CONTENT
chloroprene is used to make neoprene, but I don't know how much if any neoprene is used in tires. Sodium chloride (salt) is sometimes used in the separation. of synthetic rubber from newly polymerized styrene-butidiene copolymer, which is widely used in tires, but I don't know how much residual chloride is left behind. Susan Snow (sksnow@1stnet.com) posted some data w/ a confusing source--either an unspecified report called 'Cement Kiln Incinreration of Haz Waste vol III #4', 14 Aug 92, or that report is part of an Env Research Fndtn (try andrea@rachel.clark.net) 'Tire Fact Pack'. Anyway, its table 1 reports that tires contain 0.2% chlorine to coal's 0.14%, w/ heacy metals running several times higher than coal.
Don't know how variable those numbers might be. A lot of carbon black is used, it is possible more of this survives incineration unoxidized to CO or CO2, rather is emitted as the mutagenic, carcinogenic creosote like compounds it went in as. Dr. Paul Connett is a great if busy source of info on incineration (wastenot@northnet.org), and of course CEHJ (was CCHW).

EMISSIONS
The ERF report or fact pack reports adding 10% TDF results in 1.85% to 837.5% increases in emissions of benzene, dioxins, PAH's, NOx and metals.
EPA's 'Burning Tires for Fuel & Tire Pyrolysis: air implications' (EPA-450/3-91-024, OAQPS) has data on tire burning in various units, incl.
hof fuel boilers. I only have the exec sum., which says the effect was "genrally unfavorable on the emissions." They mention that zinc, common in tires, and particulates, increase; and zinc escapes venturi scrubbers because the particles formed are very small. I don't know how effective an ESP would be at capturing such small metal particles. For dioxins, the more the control device cools the air stream, the greater the emissions will be (dioxins form as the T is cooling). TDF in cement kiln decreased some emissions but incr. others, incl. the only organochlorines mentioned--a 20 fold incr. in tetrachloethene and a 6 fold incr. in 1,1,1-trichlorethene. An Andy Miller (PhD, PE) of EPA in RTP, NC (Combuston Research Branch) posted several cites. All are on tire open-burning emissions except 'Pilot Scale Evaluation of the Ptential for Emissions from Combustion of TDF' EPA-600-R-94-070. The author of most of the sites is a P M Lemiex, he may be w/ EPA.

A proper response to claims of state-of-the-art emissions control is to say that chemicals don't vanish, they are merely transfered from one media to another. Aside from questioning the claim--ie, what happens to the efficiency during inevitable upsets of good combustion conditions?