2,3,7,8-Tetrachlorodibenzo-p-dioxin

CAS RN: 1746-01-6

Disposal Methods

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal and plant life; and conformance with environmental and public health regulations.
SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.
Degradation by chemical means are necessary for polychlorophenol formulations because heat stable chlorodioxins are formed during incineration. Ruthenium tetroxide is a powerful oxidizing agent which reacts with a wide range of organic substances, including those aromatic compounds which are oxidized slowly, or not at all, by permanganate. It may be safely used in solution in water or in organic solvents with no nucleophilic character, such as chloroform, nitromethane or carbon tetrachloride. ... Preliminary work with TCDD showed that the rate of oxidation was increased at higher temperature and that the half-life was less than 15 min in carbon tetrachloride at 70 deg C (TCDD concentration = 72 ug/mL carbon tetrachloride; ruthenium tetroxide = 2X10+3 ug/mL, about 10 equiv). There is no evidence of the nature of fragments formed during oxidation of the polychlorodibenzodioxins. However, the related chlorophenols undergo extensive decomposition to yield chloride ions and no significant levels of organic products.
Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans could be degraded by ozonation in an alkaline aqueous medium, but no reaction occurred in acid solutions. Degradation rates of at least 99% were observed after the reaction conditions (pH, temperature) had been optimized. The investigated substances with three to eight chlorine atoms had different velocities of reaction depending on their number and configuration following reactions of second order. The selective detection and quantitative determination of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran traces was performed by capillary gas chromatography in combination with a mass selective detector.
PRECAUTIONS FOR "CARCINOGENS": There is no universal method of disposal that has been proved satisfactory for all carcinogenic compounds & specific methods of chem destruction ... published have not been tested on all kinds of carcinogen-containing waste. ... summary of avail methods & recommendations ... /given/ must be treated as guide only. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Incineration may be only feasible method for disposal of contaminated laboratory waste from biological expt. However, not all incinerators are suitable for this purpose. The most efficient type ... is probably the gas-fired type, in which a first-stage combustion with a less than stoichiometric air:fuel ratio is followed by a second stage with excess air. Some ... are designed to accept ... aqueous & organic-solvent solutions, otherwise it is necessary ... to absorb soln onto suitable combustible material, such as sawdust. Alternatively, chem destruction may be used, esp when small quantities ... are to be destroyed in laboratory. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": HEPA (high-efficiency particulate arrestor) filters ... can be disposed of by incineration. For spent charcoal filters, the adsorbed material can be stripped off at high temp & carcinogenic wastes generated by this treatment conducted to & burned in an incinerator. ... LIQUID WASTE: ... Disposal should be carried out by incineration at temp that ... ensure complete combustion. SOLID WASTE: Carcasses of lab animals, cage litter & misc solid wastes ... should be disposed of by incineration at temp high enough to ensure destruction of chem carcinogens or their metabolites. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Small quantities of ... some carcinogens can be destroyed using chem reactions ... but no general rules can be given. ... As a general technique ... treatment with sodium dichromate in strong sulfuric acid can be used. The time necessary for destruction ... is seldom known ... but 1-2 days is generally considered sufficient when freshly prepd reagent is used. ... Carcinogens that are easily oxidizable can be destroyed with milder oxidative agents, such as sat soln of potassium permanganate in acetone, which appears to be a suitable agent for destruction of hydrazines or of compounds containing isolated carbon-carbon double bonds. Concn or 50% aqueous sodium hypochlorite can also be used as an oxidizing agent. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Carcinogens that are alkylating, arylating or acylating agents per se can be destroyed by reaction with appropriate nucleophiles, such as water, hydroxyl ions, ammonia, thiols & thiosulfate. The reactivity of various alkylating agents varies greatly ... & is also influenced by sol of agent in the reaction medium. To facilitate the complete reaction, it is suggested that the agents be dissolved in ethanol or similar solvents. ... No method should be applied ... until it has been thoroughly tested for its effectiveness & safety on material to be inactivated. For example, in case of destruction of alkylating agents, it is possible to detect residual compounds by reaction with 4(4-nitrobenzyl)-pyridine. /Chemical Carcinogens/
Incinerator operating conditions currently considered adequate for complete destruction of 2,3,7,8-TCDD and most other chlorinated organics are a temp of at least 1000 deg C with a dwell time of at least 2 sec. ... The most extensively tested method is incineration, which entails a high-temp oxidation of the dioxin molecules.
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