The Evoqua Water Technologies solution was to bring in mobile demineralizer (MODI) trailers. Three 500 gpm MODI trailers were brought online to polish the RO permeate and reduce silica levels. Each trailer contained both a lead set of ion exchange vessels, as well as a polishing set of ion exchange vessels to ensure final water quality. A fourth trailer was supplied as a reserve for change-outs, based upon the need for replacing exhausted on-line units. The installed MODI trailer system, consisting of MT5500 units, was designed for a total of 1,500 gpm. Each trailer contains a total of six 60"-vessels, each housing 70-90 cubic feet of mixed-bed resin.
Before the polishing was implemented, the silica levels ranged between 500-1300 parts per billion (ppb). With a two-year contract and an option to extend, Evoqua Water Technologies began polishing the RO permeate to reduce the levels of silica to below 20 ppb.
This customer was able to dedicate part of a large gravel lot adjacent to the RO plant for the trailers, allowing for easy connection and change out. Mobile trailers provide customers optimum flexibility.