Disposal as hazardous wastes

It is the formation of this material which makes the reaction have a low atom economy and, owing to the cost of disposal (usually by conversion to calcium phosphate and disposal as hazardous waste), has limited its commercial usefulness to high value products. Several methods have been developed to recycle (Ph)3PO into (Ph)3P but these have proved more complex than might be expected. Typically the oxide is converted to the chloride which is reduced by heating with aluminium. Overall this recovery is expensive and also produces significant amounts of waste. 

Allows treated effluent to be discharged into local waste treatment facilities, allowing for a volume reduction of the material that must be disposed as hazardous waste. 

The vitrified final waste form is a nonleachable, nonbiodegradable solid that does not require disposal as hazardous waste. 

Unless the absorbent is used in a landfarming application, the absorbent and recovered contaminants may require disposal as hazardous waste. 

Disposal of formaldehyde solutions requires their collection and disposal as hazardous waste. Collect fixative and rinse solutions after fixation in a glass bottle for disposal by Environmental Health and Safety Office at your institution. Do not put formaldehyde fixatives down the drain unless the solution is deactivated with a commercially chemical treatment or unless the concentration is less than 0.1%. 

For effluents with high initial levels of heavy metals, the fmal disposal of treatment sludges may be problematical, and it is probably best to seek a process resulting in a small quantity of highly contaminated sludge to reduce the amount fra final disposal as hazardous waste. 

However, phytoremediation does have certain disadvantages and limitations. This technology is limited by depth (roots) and also by the solubility and the availability of the pollutant. Although it is faster than natural attenuation, phytoremediation requires long time periods and is restricted to sites with low contaminant concentrations. The plant biomass obtained from phytoextraction requires proper disposal as hazardous waste. Phytoremediation depends on the climate and season. It can also lose its effectiveness when damage occurs to vegetation from disease or pests. The introduction of inappropriate or invasive plant species should be avoided (non-native species may affect biodiversity). Contaminants may be transferred to another medium, the environment, and/or the food chain. Amendments and cultivation practices may have negative consequences on contaminant mobiUty. 

Electrokinetic remediation of soil and groundwater is cost-effective and averages 200 per cubic meter. At 90 per ton, treatment by electrokinetics is generally less than excavation and disposal as hazardous waste. Electrokinetic treatment of organic contaminated soil is roughly equal in cost to some thermal technologies. As... 

In summary, it is desirable to order and maintain in stock as small amounts of chemicals as practicable in order (a) to minimize the risks in the event of an incident, (b) to reduce the overall expense by reducing the amount requiring disposal as hazardous waste, and (c) to minimize the... 

The wastes collected are disposed as hazardous wastes and treated with isopropanol imder inert atmosphere before discarding. 

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