An excellent method for the water pollution control is to treat the waste water in closed system.
In such a system, as the efficient substance contained in waste water can be recovered and effluent can be reused, we will be able to save industrial water and treat waste water at low cost.
As part of the investigation of the industrial waste water treatment, we experimentally studied how to recover the raw material in waste water from one of petroleum industry, Nylon (6) process.
We found that we could accomplish the waste water treatment at low cost on the following process.
High concentrated waste water was separated from low concentrated waste water and passed through the activated carbon column to adsorb the raw material, lactam.
Adsorbed monomer was desorbed with acetone and the activated cardon was regenerated with super heated steam.
The experiment was carried out on the laboratory scale and the pilot plant scale.