Before the painting process of car bumpers can begin, the plastic parts must go through a washing process in order to remove dirt, debris, residue and slight oil or grease contamination.
The conventional washing process involves many stages:
- Phosphoric acid wash,
- Different rinsing stages,
- Rinsing with deionised water.
The production of ultra-low conductivity water is very costly and there was no way to recuperate this water for reuse. Most of it was sent to drain. The company attempted to recycle this water, but after one year of operation, biofouling and biofilm had become a significant problem in the piping network.
Additional cleaning had been carried out in order to eradicate this problem, but it resulted in recontamination the next week.