Treatability studies on secondary treated domestic wastewater for indirect potable reuse

Abstract

The rapid depletion of water resources and its availability in water, has forced industries to reconsider their activities in water management. To date, several treated wastewater reuse applications have developed including direct potable reuse (DPR)/indirect potable reuse (IPR). Constant research effort has been put forwarded to simultaneously remove the organics and pathogens. In such regard, the advanced oxidation processes (AOPs) are having the significant potency to degrade the toxic pollutants along with disinfection of pathogens in the biologically treated wastewater. There is no well-developed technology to implement in the field, although various possible techniques have been studied so far on a lab-scale. Hence, the proposed research work focused on the AOPs as a tertiary treatment process to improve treated water quality to achieve the IPR of wastewater. newlineThe objectives of the present study include sample collection and characterization of wastewater, conducting lab-scale treatability studies based on various AOPs in batch and continuous scale, and identifying the best treatment for IPR application through techno-economic analysis. The treatment of secondary biologically treated wastewater (SBTW) was studied using a lab-scale reactor with a working volume of 2.2 L. The reactor (135 mm (D) x 285 mm (L)) was assembled in stainless steel (SS 316) vessel provided with a low-pressure mercury 12W UV-lamp, emitting monochromatic light at 254 nm with a length of 240 mm. A laboratory-scale packed bed reactor was designed with Schott glass with a total capacity of 1 L and a working volume of 450 mL, with dimensions of an inner diameter of 60 mm and a height of 345 mm. newline newline newline