Code of Maryland Regulations (Last Updated: April 6, 2021) |
Title 26. Department of Environment |
Part 3. |
Subtitle 13. DISPOSAL OF CONTROLLED HAZARDOUS SUBSTANCES |
Chapter 26.13.05. Standards for Owners and Operators of Hazardous Waste Treatment, Storage, and Disposal Facilities |
Sec. 26.13.05.24. Examples of Potentially Incompatible Waste
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A. Many hazardous wastes, when mixed with other waste or materials at a hazardous waste facility, can produce effects which are harmful to human health and environment, such as:
(1) Heat or pressure;
(2) Fire or explosion;
(3) Violent reaction;
(4) Toxic dusts, mists, fumes, or gases; or
(5) Flammable fumes or gases.
B. Below are examples of potentially incompatible wastes, waste components, and materials, along with the harmful consequences which result from mixing materials in one group with materials in another group. The list is intended as a guide to owners or operators of treatment, storage, and disposal facilities, and to enforcement and permit granting officials, to indicate the need for special precautions when managing these potentially incompatible waste materials or components.
C. This list is not intended to be exhaustive. An owner or operator must, as the regulations require, adequately analyze his wastes so that he can avoid creating uncontrolled substances or reactions of the type listed below, whether they are listed below or not.
D. It is possible for potentially incompatible wastes to be mixed in a way that precludes a reaction (e.g., adding acid to water rather than water to acid) or that neutralizes them (e.g., a strong acid mixed with a strong base), or that controls substances produced (e.g., by generating flammable gases in a closed tank equipped so that ignition cannot occur, and burning the gases in an incinerator).
E. In the lists below, the mixing of a Group A material with a Group B material may have the potential consequence as noted:
Group 1-A Group 1-B Acetylene sludge Acid sludge Alkaline caustic liquids Acid and water Alkaline cleaner Battery acid Alkaline corrosive liquids Chemical cleaners Alkaline corrosive battery fluid Electrolyte, acid Caustic wastewater Etching acid liquid or solvent Lime sludge and other corrosive alkalines Pickling liquor and other corrosive acids Lime wastewater Spent acid Lime and water Spent mixed acid Spent caustic Spent sulfuric acid Potential consequences: Heat generation; violent reaction.
Group 2-A Group 2-B Aluminum Any waste in Group 1-A or 1-B Beryllium Calcium Lithium Magnesium Potassium Sodium Zinc powder Other reactive metals and metal hydrides Potential consequences: Fire or explosion; generation of flammable hydrogen gas.
Group 3-A Group 3-B Alcohols Any concentrated waste in Groups 1-A or 1-B Water Calcium Lithium Metal hydrides Potassium SO2Cl2, SOCl2, PCl3, CH3SiCl3 Other water-reactive waste Potential consequences: Fire, explosion, or heat generation; generation of flammable or toxic gases.
Group 4-A Group 4-B Alcohols Concentrated Group 1-A or 1-B wastes Aldehydes Halogenated hydrocarbons Group 2-A wastes Nitrated hydrocarbons Unsaturated hydrocarbons Other reactive organic compounds and solvents Potential consequences: Fire, explosion, or violent reaction.
Group 5-A Group 5-B Spent cyanide and sulfide solutions Group 1-B wastes Potential consequences: Generation of toxic hydrogen cyanide or hydrogen sulfide gas.
Group 6-A Group 6-B Chlorates Acetic acid and other organic acids Chlorine Chlorites Concentrated mineral acids Chromic acid Group 2-A wastes Hypochlorites Group 4-A wastes Nitrates Other flammable and combustible wastes Nitric acid, fuming Perchlorates Permanganates Peroxides Other strong oxidizers Potential consequences: Fire, explosion, or violent reaction.
Source: "Law, Regulations, and Guidelines for Handling of Hazardous Waste", California Department of Health, February 1975.