Events

The purpose of this capstone project is to develop a treatment system to recycle water from the Analog Devices’ CMP wastewater stream. A design of a wastewater recycle system will include all equipment specifications of utilities and chemicals required to get the desired exit concentrations by Analog Devices. The design must recycle 80% of the incoming 150 GPM wastewater during plant operation hours and fit in an area that is around 1500 square feet. Additionally, the system must consider an N+1 redundancy as a safety consideration during shutdown and unexpected challenges. 

The design starts with the solid removal where the wastewater will be first treated with coagulant in one mixing tank, and then flocculant in another mixing tank. The coagulant separates the solids from the water and then the flocculant groups all the solids together for easier removal from the stream. The stream will then be sent through ultrafiltration membranes to reduce the solids to below 1 ppm.

Following the large solid removal, the stream will be sent through two RO membrane systems where the pressure gradient will be insured by having a permeate pump that will increase efficiency of the membrane, hopefully close to a 90% conversion. Adjustments to the pH will be made before the coagulation/flocculation unit, as well as before the RO membrane unit to ensure that they are within the ranges that work best for those units.