Our Client, concerned about the environmental impacts generated by its envelope production activities, wishes to reduce contaminants and heavy metal concentrations to a minimum. NISKAE engineers, specialists in industrial water treatment, start several tests and analysis with the samples taken in order to elaborate a coagulant-flocculant formulation specific to the nature of the effluents encountered.
Before treatment, the washing and cleaning water was white, opaque, loaded with glue and ink residues, with a high concentration of iron (1.04mg/L) and a high level of COD at 10,900 mg/L. Our flocculation treatment with a minimum dosage of 1.5 g/L allows the separation of glue and ink residues from the clear water. After this separation, they are filtered and dehydrated through a big-bag filter. The iron concentration was reduced to 0.1 g/L after treatment, which is an abatement of almost 1 g/L. The COD level was reduced to 2600 mg/L, this value remains slightly higher than the target value of 2000mg/L for the discharge to the sewer. The integration of an activated carbon filter in addition to and at the outlet of our flocculation reactor ensures compliance of the discharge by adsorption of the excess COD.
Throughout the process, NISKAE ensures that the pH value is maintained to optimize the coagulation and flocculation reaction.