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                  18                             19      
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5 removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation
6 the advanced treatment process, following secondary treatment of waste water
7 any method of surface coal mining that destroys a mountaintop or ridgeline
8 a type of mining in which soil and rock overlying the mineral deposit (the overburden) is removed
11 The emission of radiation
13 the second step in most waste treatment systems during which bacteria consume the organic parts of the wastes
14 the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock
15 a combustion device to burn associated, unwanted or excess gases and liquids released during normal or unplanned over-pressuring operation in many industrial processes
17 to store the waste made from separating minerals from rocks, or the slurry produced from tar sands mining.
18 is a surface mining technique that extracts minerals from an open pit in the ground
19 waste matter separated from metal during smelting
20 is the material that lies above an area that lends itself to economical exploitation
1 the process of purification of a (1) substance or a (2) form
2 the process of water carrying soluble substances or small particles through soil or rock
3 a type of wastewater that is produced by a community of people.
4 the separation of a mixture into its component parts
8 a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems.
9 to add air or oxygen into a liquid.
10 flat expanses of ground covered with salt and other minerals
12 any substance used to kill, repel, or control certain forms of plant or animal life that are considered to be pests.
16 A disposal site where solid waste, such as paper, glass, and metal, is buried between layers of dirt and other materials in such a way as to reduce contamination of the surrounding land.
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