This paper presents the results from the full-scale testing of aluminum chlorohydrate (ACH) that is underway and describe lessons learned relevant to facilities that face similar challenges associated with variable water quality....

The City of Tucson AZ are planning for potable reuse using a municipal secondary wastewater effluent. The technologies piloted were Soil Aquifer Pretreatment (SAT), nanofiltration (NF), ozonation, Biological Activated Carbon (BAC) and Granular Activated Carbon (GAC). The system goal is reduction of permeate TDS to less than 500 mg/l, reduction of T...

This paper will focus specifically on the performance of soil aquifer treatment and Nanofiltration and the benefits they provide in the alternative potable reuse scheme for the City of Tucson Arizona rather than microfiltration followed by reverse osmosis and ultraviolet treatment. The treatment scheme piloted included short term soil aquifer trea...

On-line integrity monitoring of NF and RO membranes for demonstrating pathogen removal using the Nalco TRASAR(TM) fluorescently-tagged antiscalant was evaluated at pilot scale. The results showed that 2.5- and 3-log removal can be achieved for NF and RO membranes, respectively; significantly greater than can be achieved using conventional monitorin...

Drought conditions and imbalances between supply and demand in the Colorado River watershed have demonstrated the need for the development of long-range measures to manage and stretch the system's water supplies. One of the options to address this issue is operation of the Yuma Desalting Plant (YDP), which has been mostly out of service since its c...