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Village of West Jefferson
Equipment used and capabilities:
Project Profile
The Village of West Jefferson currently owns and operates a 1.2 mgd iron removal and ion-exchange softening groundwater treatment facility, with a current average water production of approximately 0.40 mgd. The source water for this facility has elevated levels of total dissolved solids including sodium and chlorides, as well as a hardness in excess of 300 mg/L. The current softening process utilized, ion-exchange, is operated such that hardness is reduced to only 200 mg/L in an effort to limit the increase in sodium concentration associated with ion-exchange treatment.
In 2005, Reiss Environmental provided pilot equipment for a five month study to collect information regarding the feasibility of reverse osmosis as a cost-effective and viable treatment option. The REI Skid-Mounted pilot system selected for this project included a 2:1 array unit designed for seven 4-inch spiral wound elements per pressure vessel. The pilot equipment package included an Antiscalent feed system, two cartridge filters, and a high pressure pump. The Skid-Mounted pilot was housed in a moderately sized structure constructed by West Jefferson staff on site. This system was designed to provide representative flux and recovery settings consistent with full-scale designs.
Performance of the reverse osmosis membranes was studied during operations of 2,000 hours during the 5-month pilot study period. A continuous 200-hour operational demonstration was conducted between November 22, 2005 and December 1, 2005 during which operating parameters were held constant to reflect conditions proposed for the full-scale plant.
The pilot study results indicated that operation of the reverse osmosis membranes fell within standard engineering practice for operation and maintenance of a membrane softening facility. The pilot program clearly confirmed the need of the addition of an Antiscalent and pH adjustment through acid feed to the feed water stream prior to the membranes, as evident by the cleanings required prior to acid addition to the pretreatment regime. Design efforts for the full-scale improvements to the West Jefferson facility were initiated after the pilot information was submitted and reviewed by the City.
Membrane equipment at work
These project profiles demonstrate specific applications where our equipment was used as a test pilot or for a temporary purpose.