Performance of Rock Filters

(m3/m3d)

Run

T(°C)

PH

(mg/L)

H2S (mg/L

Influent

-

1

25.7

7.7-8.3

3.2

0.02

-

2

21.0

7.4-8.1

4.8

0.02

-

3

14.0

7.9-8.0

4.0

0.30

-

4

15.0

7.3-7.9

3.5

0.02

First Train

Rock filter 1

0498

1

25.1

7.3-8.3

1.2

0.18

Average

0.634

2

20.0

7.0-7.9

1.5

0.02

diameter =

18 cm

Voids = 49%

0.5-0.58

3

13.4

7.8-8.0

1.0

0.30

Surface area

0.5-0.58

4

13.0

7.0-7.9

2.1

0.02

= 17 m2/m3

Wadi gravel

0.386

1

25.2

7.5-8.5

1.9

0.63

filter 1

Average

0.634

2

19.9

7.1-7.8

1.4

0.02

diameter = 11.6 cm diameter = 11.6 cm

Parameter

85

201

161

93

234

182

97

213

179

71

101

88

89

131

113

96

200

146

96

156

133

72

76

97 161 118

TP BOD5 COD

23

95

334

21

105

341

19

122

398

14

108

323

21

61

272

20

81

300

18

100

317

13

77

18 66 263

2.2E+03 57E+04

8.1E+05 14E+04

1.00E+03

4.2E+04

Surface area = 25 m2/m3

Second Train

Rock filter 2

Average diameter = 18 cm

Surface area = 17 m2/m3

Coarse aggregate filter 2

Average diameter = 2.4 cm

Surface area = 150 m2/m3

0.311 1

0.634 2

0.333 1

0.634 2

97 129 71 66

89 130

98 203

98 164

71 88

89 102

98 154

96 134

71 60

114 16 60 13

110 21

144 20

137 17

79 13

92 15

117 16

115 16 52 11

77 306

74 263

53 263

79 301

87 336

92 293

51 223

65 257

73 285

87 246

47E+05 l.lOE+04

1.5E+03

3.2E+04

54E+05 6.5E+03

0 0

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