According to the standard, solid waste is defined as: Solid and semi-solid waste, resulting from industrial, domestic, hospital, commercial, agricultural, service and sweeping activities. Included in this definition are sludges from water treatment systems, those generated in pollution control equipment and installations, as well as certain liquids whose particularities make their release into the public sewer or water bodies impracticable, or require for that purpose. technically and economically unviable solutions in view of the best available technology.

The classification of solid waste, according to the standard, was defined as follows:

Class I waste? Hazardous: Waste that presents a hazard or at least one of the following characteristics: flammability, corrosivity, reactivity, toxicity or pathogenicity.

Class II waste? Non-hazardous: Are the waste non-hazardous and do not fall under the classification of class I waste and are divided into: Class II A waste? No Inert and class II B? Inert.

Class II A waste? Non-inert: These are those that do not fall under the class I class I or class II B classifications and may have properties such as biodegradability, combustibility or water solubility.

Class II B waste? Inert: Any waste that, when sampled in a representative manner and subjected to dynamic and static contact with distilled or deionized water, at room temperature does not have any of its constituents solubilized at concentrations above water potability standards, except appearance, color, turbidity, hardness and flavor.