Review of Waste Water Reuse with using a Combination Adsorption-Gel Resin Filtration as a Hybrid Process

Abstract

The “adsorption-ion exchange” system is a newly developed process in water and wastewater treatment operations where the adsorption process in active carbon and silica sand beds as well as the ion-exchange process in resin beds (Gel resins) are used in combination to reduce contamination to acceptable levels suitable for reuse. This system has various applications including in power plants where the beds are of the “fixed” type. By utilizing the adsorption-ion exchange technology which has a high potential for processing a wide volume of wastewater as well as generating a high economic value, this hybrid system can be used to provide clean drain wastewater (wastewater exiting boilers and blow down boilers) with high purity for the water cycle in the power plants. In this study, the mentioned system is used for wastewater treatment in Neyshabour Power Plant to reduce sodium ion level from 1250 mg/lit to 1.9 mg/lit and the COD level from 411 mg/lit to zero. Also, conductivity was reduced from 2180 µS/cm to 560µS/cm. The system demonstrated the capability of eliminating sodium ion up to 99.6%.

Keywords: Silica beds, active carbon filter, resin filter, Gel resin