WASTEWATER TREATMENT PLANTS - WATER RECOVERY PLANTS

Zero Liquid Discharge

When a customer desires to comply with certain company policies or local regulations requiring him to avoid any final discharge, a series of treatments need to be considered in order to recycle the water and dispose of the residual matter.

First of all, Panta Rei provides a proper biological treatment in order to carry out the degradation and reduction of the main pollutants such as BOD, COD and suspended solids. Following this, a filtration and preliminary treatment stage is set. Then, a membrane treatment follows the process line. The first section is made of an ultrafiltration treatment to guarantee a fine removal of the suspended solids and protect the following membrane treatment steps.

Finally, a reverse osmosis section removes the color, reduces the total dissolved solids concentration and all the residual pollutants in order to produce a high quality water whose characteristics make it suitable to be reused in the dyeing process, the boilers or any other application requiring high purity water.

It is possible to configure the reverse osmosis stage in order to obtain a larger recovery percentage, which ranges from 60 to 92 percent accordingly if one, two or three steps are installed. Panta Rei provides a process analysis to determine the cost and benefits as a function of the recycled water amount, capital cost and power consumption. We can treat the reject of the reverse osmosis membranes with natural, multi-stage or vacuum evaporators in order to close the zero discharge process loop and thus guarantees full compliance with the most constringent environmental laws.