Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/86284
PROJECTS equivalent of 238% of the Carlsbad plant's designed water production. On the other hand, the average SWRO recovery ratio of 50% yields 72.5 MGD (274,400 m3 this latter value by adding to it 50% for reuse, leads to a net water value of 108.7 MGD (411,400 m3 of 217% of the plant design value. /d) of water (Table 1). Raising /d), the equivalent UPGRADING CARLSBAD PLANT San Diego County is continually trying to prevent water shortage by urging reduced wastage of water use as well as customarily raising the water price. Now, the county can suggest that the desalination plant owners, Poseidon Resources, convert the present plant design to NF-SWRO Hybrid with MED addition to produce an anticipated average water quantity increase to the County of 228% compared with that from the present design. Such a complete conversion and upgrading of Carlsbad is not anticipated to be very expensive. It can be done by the many San Diego desalination companies. GE performed such an upgrade by converting the commercial Ummlujj SWRO plant in Saudi Arabia to NF- SWRO Hybrid, to increase water production capacity by 48% converting only one of the plant's two trains, which then received only two thirds of the NF permeate instead of the full total feed according to plant design, ie, 204 m3 instead of the pump design value of 360 m3 The price of < US$ 2 million included the total cost of acquisition of both the NF membrane assembly lines for the entire plant plus the cost of the NF membranes themselves, again for the two-line plant. Upgrading the plant is anticipated potentially to produce up to 14,380 m3 /d. which is 326 % of the plant production of 4,412 m3 /d, includes the addition of MED treatment of SWRO reject in order to benefit from the added water production by the MED operation. To obtain the added capacity of 9,968 m3 This proposed upgrading process /d as built in 1986. production capacity using conventional SWRO would have required much more money. Additionally, building SWRO would have required more time. The above mentioned low price of < $2 million, however, does not include the MED unit price. To support such a proposal in California /d by building the same May-June 2012 | Desalination & Water Reuse | 21 | /h, would still require, as is customary, assurance and confirmation from pilot- plant operational results. Pilot-plant operation is also required to establish accurately NF and SWRO TDS yield and rejection limits at the site. Such a pilot plant can be built by one of the many local San Diego SWRO companies, and in turn be fully integrated with the present SWRO pilot plant design at the Carlsbad site, in collaboration with the concerned parties. Project3 27/4/12 2:55 pm Page 1 design, which has proved to have a much superior performance than that of traditional conventional SWRO/Thermal design processes, deserves to be promoted and commercially known not only in San Diego but also to all communities worldwide that need more water to cover their water shortages. This Dual Tri-NF-SWRO Hybrid