In order to select two candidate membranes for pilot-skid testing, a laboratory testing protocol was developed to investigate the viability of commercially available RO, ULPRO and NF membranes for treating wastewater effluents during indirect potable reuse projects. Parameters relevant to indirect potable reuse projects were chosen as criteria for the evaluation and identification of membranes that could be used to efficiently treat wastewater effluents. The testing protocol evaluated membranes based on the rejection of relevant solutes and constituents present in wastewater effluents (TOC, nutrients (NH3 and NO3 -), conductivity, and selected trace organics), as well as operational performance (specific flux, and flux decline due to fouling).
Based on the results from the membrane testing, membranes were ranked in order of how well they performed and the highest ranking membrane was chosen for installation on the pilot-skid operated at the WBWRP. The purpose of this paper is to present the membrane testing protocol used to evaluate the candidate membranes and the selection criteria that were used to select membranes for installation on the pilot-skid operated at the WBWRP.