Water and Wastewater Terms Beginning H

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hazardous waste

A waste that possesses any one of the following four characteristics:

  1. Ignitability, which identifies wastes that pose a fire hazard during routine management. Fires not only present immediate dangers of heat and smoke but also can spread harmful particles over wide areas. A liquid that has a flash point of less than 140°F (60°C)
  2. Corrosivity, which identifies wastes requiring special containers because of their ability to corrode standard materials, or requiring segregation from other wastes because of their ability to dissolve toxic contaminants. An aqueous solution with a pH less than or equal to 2 or a pH greater than or equal to 12.5
  3. Reactivity (or explosiveness), which identifies wastes that, during routine management, tend to react spontaneously, to react vigorously with air or water, to be unstable to shock or heat, to generate toxic gases, or to explode
  4. Toxicity, which identifies wastes that, when improperly managed, may release toxicants in sufficient quantities to pose a substantial present or potential hazard to human health or the environment