Water. desalination + reuse

August-September 2012

Water. Desalination + reuse

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TECHNOLOGY 120 0.35 IK-110 20 mg/L x3h/24h IK-110 20 mg/L 0.30 0.25 80 0.20 60 40 flux (m/d) perminate flow (m3/h) 100 Blank 20 0 0 10 20 30 40 50 60 70 80 Blank 0.15 0.10 0.05 0.00 90 100 0 10 20 Operation time (days) 30 40 Figure 3. Comparison of permeate flow in Blank and in lines with IK-110 added. 50 recovery rate (%) p (mpa) 0.2 IK-110 20 mg/L x3h/24h 0.1 0 10 20 70 80 90 100 IK-110 20 mg/L x 3h/24h 40 0.3 0.0 60 Figure 4. Comparison of flux*1) in Blank lines and in lines with IK-110 added Flux (m/d) = Permeate flow (m3/d) ÷ membrane area (m2) Blank 0.4 50 Operation time (days) 30 40 50 60 70 80 90 100 30 Blank 20 10 0 0 10 20 Operation time (days) SummarY Of rESuLTS The line to which the slime inhibitor, Kuriverter IK-110, was added required cleaning once every three months, while the Blank line required cleaning every month. This means that IK-110 could reduce the frequency of cleaning to onethird. Adding IK-110 ensured a recovery ratio 35 days after the start of operation that was 12% higher than in the case of the Blank line. In addition, the line with IK-110 added could achieve a higher recovery ratio and a high flux in spite of higher load conditions than the Blank line. mEriTS ObTaiNEd bY appLYiNG iK-110 l Effects obtained from application of IK-110 in Seawater Desalination RO plant: l Prevention of reduction of flux and recovery ratio l Increase in power efficiency due to increase in flux l Reduction of frequency of RO membrane cleaning 40 50 60 70 80 90 100 Operation time (days) Figure 5. Changes in module differential pressure water quality was stable. TOC was found to be relatively higher at 3.9 mg/L than the general seawater TOC of Japan at 2 mg/L. 30 Figure 6. Changes in recovery ratio Table 3. Result of water quality analysis 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Date of sampling Conditions Water type pH (16°C) Electric conductivity (mS/m) Chloride ions Sulfate ions TOC CODMN Ammonium ions Nitrite ions Nitrate ions Total nitrogen Total phosphorus Sodium Potassium Calcium Magnesium Copper Manganese Iron Aluminum Nickel Cobalt Molybdenum Strontium 8/23 Blank Feedwater 8.1 39,400 15,500 2,092 8/30 Blank Feedwater 7.8 40,300 16,816 2,662 ND <0.06 5.6 47 <0.1 8,912 216 339 1,081 0.1> 0.1> 0.1> 0.18 0.1> 0.02 0.1> 3.93 <0.2 <0.06 6.8 9.9 <0.1 8,666 238 356 993 0.1> 0.1> 0.1> 0.1> 0.1> 0.1> 0.1> 4.78 CONCLuSiON IK-110 is a unique slime control agent for RO systems. In this report, the effectiveness of IK-110 is verified in a seawater desalination plant. The treatment has following primary merits: l Differential pressure is stable. 9/22 Blank Feedwater 7.7 34,800 14,000 2,260 220 740 <0.1 1/19 Blank Feedwater 7.8 40,900 14,600 2,544 3.9 4.1 <0.2 <0.1 5.1 1.0 <0.1 8,637 248 347 1,070 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 4.8 l Flux decrease is improved and recovery ratio is maintained. l Cleaning frequency is reduced, or cleaning effect is enhanced. l Polyamide membrane deterioration risk is reduced. l Power efficiency is increased due to increase in flux. l August-September 2012 | Desalination & Water Reuse | 39 |

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