In order to decide whether pretreatment or segregation is necessary or not, liquid waste and hazadous or refractory materials within is evaluated during this project which focus on leather tanning, photo developing, photoengraving, petrochemical, and chemical industries. The evaluation includes cost, technical feasibility, and regulatory feasibility. After investigation and evaluation, pretreatment and silver recovery in photo developing, photoengraving industries are found necessary; and segregation is necessary in cohesive resin industry for oil-based waste liquid. If the segregation or pretreatment are not implemented, it will severely affect the wastewater treatment system. In regulatory enforcement, those who fail to pretreat or segregate the specific waste will not be able to obtain discharge permit. For those smaller companies are capable to pretreat their wastewater, we suggest they commit legal TSDFs (if available) for the specific waste treatment and summit the contracts of the treatment to Environmental Protection Administration.

waste water,specific compound, waster liquor