Quality with the terms of the environment
Considering the environment the surface treatment plants are challenging because of the water used to rinse the objects being treated. The rinsing waters have to be cleansed of heavy metals before releasing them into the public waste water treatment system.
Pinnoitus Helin has an environmental permit from the Environment Centre and a chemical permit from Safety Technology Authority (Tukes) for a wide-scale surface treatment plant.
BAT acronym (Best Available Technology) means the best possible actions and means to minimize the environmental load. At Pinnoitus Helin it means cleansing and environmental protection methods that utilize the newest and most advanced methods in use. This means better control of material and substance flows, more effective use of energy, and less discharges.
Examples of BAT recommendations used by Pinnoitus Helin:
- Fully automated constant flow plant that will stop the flow if process values are not in the permitted area. The process also has backup measurements to detect possible contradictions or sensor breakdowns.
- Precipitation is backed up with a continuously cleaned sand filter.
- Before entering sewer the waste water goes through the final ion exchanger to remove possible minute heavy metal concentrations. The regeneration cycle of the ion exchanger is monitored with weekly values of flow-weighted collection samples.
- The heavy metal precipitate is delivered to a recycling plant where the metal precipitate is refined for reuse.
- The easiest and safest way to stay within the allowed limits is the careful selection of the chemicals used. Minimizing the use of complexing agents will substantially ease the coagulation process and subsequent precipitation of the heavy metals.