Экономика и менеджмент \ Организация и планирование производства

Induction times induced in an RO system by antiscalants delaying. Induction time model, страница 6

Antiscalant

Recovery 72%

Recovery 75%

Recovery 78%

Exp. no.

Ind. time, h

Sb/Sw, %

Exp. no.

Ind. time, h

Sb/Sw, %

Exp. no.

Ind. time, h Sb/Sw, %

Blank

41

40

36

42

0.625

0.875

0.75

0.25

2.9/3.7

3.1/3.9

3.1/4.0

3.2/4.0

44

0.25

3.4/4.3

A, 6 ppm

32

48

1.5

0.7

2.9/3.8

3.1/3.9

43

1

3.4/4.0

46

1.5

3.8/5.2

A, 12 ppm

68

158

155

6.75

4.38

8.75

3.0/4.1

3.0/4.5

3.1/4.1

59

157

3.5

3.25

3.6/4.4

3.6/4.8

60

63

156

5

5.25

2.13

4.1/4.6

4.0/4.6

4.1/5.1

B, 6 ppm

51

2

2.9/4.0

47

1.125

3.6/4.4

45

0.75

3.8/4.9

B, 12 ppm

152

153

10.5

11

3.2/3.9 3.2/3.9

105

154

9

3.3/4.1

64

149 95

4.25

3

2.5

4.0/4.7

3.8/5.0

3.6/4.7

SHMP, 6 ppm

115

116

21.5 18.5

3.3/4.4 3.1/4.2

58a

56

12

>10

3.5/4.3 3.4/4.4

57a

97

6.5

>9.5

3.9/4.7 4.2/4.7

SHMP, 12 ppm

99a

131

132

>9.5

34±5 43

3.2/4.1

3.2/4.4

3.1/4.3

87a a

100

133

>9.5

>9.5 23

3.6/4.6

3.7/4.5

3.5/4.5

74 a

104

8.25

>9.5

4.1/5.0 4.3/4.8

C, 6 ppm

78a

117

160

>10

16.5

9.9

3.1/4.2

3.1/4.3

3.1/4.4

79

147

162

5.5

8

4.75

3.9/4.6

3.9/4.7

3.6/4.6

119

161

2.75

3.74

4.1/5.6

4.3/5.5

C, 12 ppm

120 159

166

7.5

12.5

9

3.2/4.5

3.2/4.4

3.2/4.3

122

165

167

7.25

5.33

6

3.6/4.6

3.6/4.9

3.6/4.9

75

3

4.3/5.5 4.0/4.8

D, 6 ppm

124a 140

170

>12

29

15.5

3.2/4.4

2.7/4.3

3.3/4.4

84aa

88

171

>6

>9.5

8.5

3.4/4.2

3.6/4.1

3.6/4.9

98

168

8.5

2.5

4.0/5.0

4.2/5.6

D, 12 ppm

173

176

11.5

12

3.2/4.4

3.1/4.4

103a

178

>9

5

3.5/4.6 3.5/5.2

111

123

6 3.25

3.7/4.8 4.2/5.5

aRun terminated before the onset of membrane scaling.


surface. Membrane wall super-saturation ratios were in the range of 3.7–4.4 (for 72% recovery), 4.1–4.9 (for 75% recovery) and 4.6– 5.5 (for 78% recovery).

In several runs marked with a star (*), the

Fig. 3. The effect of the CaSO4 supersaturation ratio on the severity of flux decline (blank, no antiscalant).

Fig. 5. Relative effectiveness of various antiscalants at a water recovery of 72% and antiscale dosage of 6 ppm.

onset of scaling was not detected during the time of the experiment; in these runs the magnitude of the induction period has a higher value than the experimental time. Inspection of results of repeat runs shows that reproducibility of induction time measurements was satisfactory in most cases.

Fig. 4. The effect of the CaSO4 supersaturation ratio on the severity of flux decline (antiscalant B, 6 ppm).

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