Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/86284
PROJECTS Table 1: Effect of Carlsbad NF-SWRO Hybrid plant operation variables on plant water production Feed NF Permeate SWRO Water SWRO MED (MGD) (MGD) @ 85% Recovery from Recovery Ratio (%) SWRO (MGD) 60% Water Feed (%) (MGD) Recovery (MGD) (MGD) 16 19 22 24 27 79 77 76 74 72 106 90 106 90 106 90 106 90 106 90 70.00% 63 65.00% 59 60.00% 54 55.00% 50 50.00% 45 27 32 36 41 45 74.80% 73.10% 71.40% 69.70% 68.00% Reject Water @ Total Water/ Water/ Water Water/ Design (%) Plant Ratio Ratio Total Wastewater (%) Plus 50% Recovery (MGD) 158.58% 154.97% 151.37% 147.76% 144.16% 119 116 114 111 108 237.86% 232.46% 227.05% 221.65% 216.24% l The new MED distillate operations. As noted in Table 1, the two variables of water production from the SWRO and MED operations have reverse effects on water production: the water production contribution of the SWRO operation declines as the SWRO water-recovery decreases, while that of the MED water- recovery rose, since the operation increased the SWRO reject. It is important to emphasize that the last MED operation variable was not permitted prior to this NF-Hybrid invention. Large benefits can be gained from this l The two water production variables from the SWRO Ratio Design Figure 4 – Bacteria count at different sampling points in NF pilot plant 50,000 45,000 40,000 35,000 30,000 25,000 20,000 16,438 15,000 10,000 220 5,000 0 TDS Cl- Hardness Total SO4-- Mg++ Ca++ HC03- Figure 5 – Effect of New Pretreatment Process on Removal of Hardness Ions and TDS at Umm Lujj NF-SWRO Unit | 20 | Desalination & Water Reuse | May-June 2012 <2 29 489 40 39 17 10,000 0 1,527 3,100 30,000 20,000 28,260 21,587 45,460 38% 24% Ionic 97% Hardness 7,500 Seawater NF Nitrate 99.9% 98% 100,000 92% 56 90,000 80,000 70,000 60,000 50,000 40,000 observation by deciding how to safely control the operation of these two variables without a maximum change in water flow, by varying the SWRO operation from 70% down to 50% by controlling, for example, the SWRO pressure, while continuing to maintain MED operation fixed at 60%. Varying these five variables, even from 70% down to a 50% ratio, still provides a total water production minimum of 72.5 MGD (274,400 m3 in water production of 144% over the SWRO design. Nearly half of the above domestic /d) for an increase drinking water added to the San Diego County supply, from both the designed SWRO case or the proposed upgraded NF-SWRO Hybrid, can be further recovered as wastewater, which can be cheaply treated for an available increase in total county water resources. The present anticipated water increase of the upgraded plant, Figure 2 is 79.3 MGD (300,000 m3 /d), or the added for wastewater reuse, the equivalent of 39.6 MGD (150,000 m3 total 118.9 MGD (450,000 m3 /d). When 50% is /d), to bring the Ions concentration (ppm)