Waste water treatment
Polluted waste water from PV factories have to be treated according to environmental rules, and can be split in three main streams:
- Polluted process water will be drained to the WWT system. Element concentrations will be reduced according to local environmental requirements, so the treated water can be discharged to the sewer;
- Domestic waste water will be discharged to the sewer without treatment;
- Rain water from roofs can be discharged in ground infiltration units without treatment.
For the polluted process water a WWT system will be installed, making use of the chemical/physical principle. By supplement of coagulation substance micro-flakes will be formed. The supplement of neutralising substances will bring the pH-value up to an acceptable discharge level. The supplement of flocculation substance will take care of originated micro-flakes to agglomerate to macro-flakes.
A WWT system can be executed as a continuous flow system or as a batch system (only for a small waste water amount to be treated).