Glossary H-I

Hazardous wastes By-products of society that can pose a substantial or potential hazard to human health or the environment when improperly managed. Substances classified as hazardous wastes possess at least one of four characteristics- ignitability, corrosivity, reactivity, or toxicity – or appear on special lists.
Impound-ment A body of water or sludge confined by a dam, dike, floodgate or other barrier.
In site treatment Treatment of a waste in place, as opposed to pumping or digging the waste up and then treating it.
Incineration 1. Burning of certain types of solid, liquid, or gaseous materials.

2. A treatment technology involving destruction of waste by controlled burning at high temperatures, e.g., burning sludge to remove the water and reduce the remaining residues to a safe, nonburnable ash that can be disposed of safely on land, in some waters, or in underground locations.

Incinerator A furnace for burning wastes under controlled conditions.
Indirect discharge Introduction of pollutants from a non domestic source into a publicly owned waste treatment system. Indirect dischargers can be commercial or industrial facilities whose waste go into the local sewers.
Influent The fluid entering a system, process, tank, etc. An effluent from one process can be an influent to another process.

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