Treatment refers to means subjecting the substance to physical, chemical, biological or thermal processes at an off-site location prior to final disposal.

See also:
"Treatment" is in the NACE Code "28.5"
  Treatment and coating of metals; general mechanical engineering

"Treatment" is in the ISIC Code "2892"
  Treatment and coating of metals; general mechanical engineering on a fee or contract basis

"Treatment" is in the NAICS Code "221320"
  (Sewage Treatment FacilitiesCollection, treatment, and disposal of waste through a sewer system)