Water reuse in plastic pipe manufacturing process

Evopipes company manufactures plastic pipes through the extrusion process. The total water consumption for production purposes of the plant is between 500 and 750 cubic meters per day, which is around 200-250 thousand cubic meters per annum. To stay competitive and sustainable, the company needs to keep fresh water abstraction to the minimum.
The water in the production process is included in the closed cycle. The water is filled into a 25m3 reservoir/tank, from which it is cycled through the production plant and equipment cooling system. The mentioned volume of water is reused/recycled 25-30 times per day, amounting to the total consumption between 500 and 750 cubic meters of water per day. This process is repeated for around 4 months. In such way the single volume of water is recycled between 2500 and 3500 times. In order to make it possible, a special 3D TRASAR™ technology by Nalco company is used that employs a mix of chemical additives to water that limit scaling and corrosion of plant equipment and fouling (microbiological contamination) of water. Water quality is monitored continuously by the automatic process and chemicals are added only in case the water contamination reaches certain threshold and until the water reaches necessary quality. Then water is changed and the used water is settled for a period of several days, in order for the active chemicals in water (including biocides)to partly biodegrade and the water to become safe for discharge into the environment.