Hazardous inorganics

The only means by which inorganic wastes can be rendered nonhazardous are dilution, isolation (as in deep-well injection), in some cases changes in oxidation state, and neutralization. Acidic wastes made up one-fifth of the injected waste volume and involved one-third of the injection wells in 1983. Most of the volume was from inorganic acids (hydrochloric, sulfuric, and nitric). Acid-base characteristics and neutralization were discussed in detail earlier, so the remainder of this section will focus on heavy metals and other hazardous inorganics (selenium and cyanide). 

Inorganic elements can be broadly classified as metals and nonmetals. Most metallic elements become toxic at some concentration. Nine elements (arsenic, barium, cadmium, chromium, lead, mercury, nickel, selenium, and thallium) and cyanide are defined as hazardous inorganics for the purposes of deep-well injection. 

Major Processes and Environmental Factors Affecting Geochemical Fate of Hazardous Inorganics... 

The major processes affecting the geochemical fate of hazardous inorganics are acid-base adsorption-desorption, precipitation-dissolution, complexation, hydrolysis, oxidation-reduction, and catalytic reactions. The significance of these processes to inorganic wastes is discussed only briefly here additional information on individual elements is given in Table 20.16. 

List of hazardous inorganic and organic constituents Yes 40 CFR 258, App. II EPA 1993c... 

Municipal Solid Waste Landfills Appendix II - List of Hazardous Inorganic and Organic Constituents 0.1-20 pg/L (Practical Quantitation Limits for 2 Methods) 40 CFR 258 EPA 1991b... 

EPA. 1991a. Municipal Solid Waste Appendix 11-List of Hazardous Inorganic and Organic Constituents. U.S. Environmental Protection Agency. Code of Federal Regulations. 40 CFR 258. 

Among the hazardous inorganic components, lead occupies the first position, since it pollutes the soil in cities and areas adjacent to highways and... 

Municipal solid waste landfills— hazardous inorganic and organic constituents Suggested method PQL... 

As a result of the coke filter the concentrations of the remaining pollutants (hazardous inorganic gases and quick ash) lie beneath the maximum permissable concentrations for working areas. 

Oh BS, Oh SG, Hwang YY et al (2010) Formation of hazardous inorganic by-products during electrolysis of seawater as disinfection process for desalination. STOTEN 408 5958-5965... 

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