HW was generated in almost all industrial sectors, but
93% of the total HW was generated in 20 industrial sectors,
and 40% of total HW was generated in the chemical materials
and chemical products industry.10 Five categories of
HW, i.e., waste alkali, waste acid, inorganic fluoride waste,
copper waste, and inorganic cyanide waste, make up 57.8%
of the total HW generated.