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9831 41 32
Langelier Ryznar3
1 2 2 2 2 1- : E-mail: [email protected] 2- 3-
: . . : 8831 21 . pH . ) (LSI ) (RSI . : LSI 32/0- 64/0- 89/7 73/8 . LSI 9 RSI 6 01 . : pH ... . :
: 91/5/98
: 02/3/98
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63 . . 06 ]3[. 4408 ISO ]4[. pH ) ( . . . ]5[. ]6[.
. . . ]1[. . . . ]2[. . ) (Bench scale 5791 Battelle-NBS 07 2/4 ) (GNP
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(RSI) Ryznar . RSI LSI . RSI . LSI RSI )3 (mg/l.CaCO )3 (mg/l.CaCO ) pH (mg/l ) ( C . ]11[. pH pH )3 (CaCO ]21[. EPA ]9[. ]31[. . ) ( o
. ]7[. ]8[. ]9[. . ]01[. . . ]1[. ) (LSI . LSI pH . LSI pH
]11[.
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0 < :LSI 3 CaCO )( 0 = :LSI ) ( 0 > :LSI ) 3.(CaCO :RSI RSI = 2(pHs) - pH
. ) ( . 21 42 . 5/0 . pH TDS . Water Stability Analyzer LSI RSI
:RSI 6 > :RSI . 8>> :RSI 1 2 . WHO . . LSI RSI . LSI 9 . 32/0- 64/0- .
. ]11[: :LSI LSI = pH pHs
pHs pH :)pHs = (9.3 + A + B) - (C + D 01 / )1 - ]A = (Log10 [TDS 55.43 + )372 + B = -13.12 x Log10 (oC 4.0 - ]3C = Log10 [Ca2+ as CaCO ]3D = Log10 [alkalinity as CaCO
LSI :
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8 73/8 . 1 2 .
RSI 6 2 89/7
1. ) 1 (
RSI 20/8 71/8 48/7 72/8 33/8 17/7 86/7 15/7 12/8 48/7 49/7 13/8 89/7
LSI 91/0- 52/0- 70/0- 15/0- 95/0- 00/0 10/0 71/0 84/0- 21/0- 41/0- 75/0- 32/0-
pHs 38/7 29/7 77/7 67/7 47/7 17/7 96/7 86/7 37/7 27/7 08/7 47/7 57/7
EC )(S/cm 089 5101 567 5341 0431 398 067 028 0631 5101 217 5201 0101
)( C 5/81 81 2/71 5/71 5/71 51 3/61 71 5/81 71 91 5/61 52/710
pH 46/7 76/7 7/ 7 52/7 51/ 17/7 7/ 7 58/7 52/7 6/ 7 66/7 71/7 35/7
)3(mg/L.CaCO 632 212 612 042 062 812 022 222 442 602 402 822 5/522
)3(mg/L.CaCO 8/001 09 6/921 621 2/331 8/451 1/251 8/541 531 441 4/131 6/831 577/131
1S 2S 3S 4S 5S 6S 7S 8S 9S 01S 11S 21S
2. ) 2 (
RSI 59/7 94/8 33/8 95/8 91/8 65/8 06/8 36/8 58/7 81/8 55/8 35/8 73/8
LSI 41/0- 65/0- 33/0- 55/0- 44/0- 25/0- 15/0- 26/0- 43/0- 44/0- 84/0- 46/0- 64/0-
pHs 18/7 39/7 00/8 40/8 57/7 40/8 90/8 10/8 15/7 47/7 70/8 98/7 9/ 7
EC )(S/cm 065 559 898 548 0921 039 899 365 5521 0911 067 6021 2/459
)( C 61 8/01 4/11 1/01 4/11 8/8 8/7 8/51 2/31 2/31 1/11 2/8 84/110
pH 76/7 73/7 76/7 94/7 13/7 25/7 85/7 93/7 71/7 3/ 7 95/7 52/7 44/7
)3(mg/L.CaCO 281 091 261 051 081 441 641 631 012 661 241 461 33/461
)3(mg/L.CaCO 441 4/041 2/331 6/831 522 8/451 441 6/021 4/203 2/322 6/921 4/302 6/171
1S 2S 3S 4S 5S 6S 7S 8S 9S 01S 11S 21S
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. pH . )9 (S . . EC 55/0 . . 57% LSI 71% 8% 001% . RSI 05% 8 8- 7 3,38% 7,61% 8- 7 . ) ( . . . 02% ]31[. 2. ) (RSI 1. ) (LSI
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AI LSI RSI 3 ]51[. 6002 AimanE. Al-Rawajfeha Ehab M. Al-Shamaileh
6831 LSI RSI 24/0+ 7/6 . 59% LSI . %82 RSI 21% . . ]31[. 7831 LSI . . RSI . ]01[. 8731 %57 LSI . RSI . ]41[. 88
Tafila LSI RSI . LSI 93/0- 5/1- RSI 7/8 8/9 CCPP 1/77- 67/61- . 2 CO ]61[. 8991 G. Ptzaya ]71[.1
1. Calcium Carbonate Precipitation Potential
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1. " " 88312. Crittenden JC, Trussell RR, Hand DW, Howe KJ, Tchobanoglous G, "Water treatment principals and 5002 ,design", New York: Jon Wiley and Sons 6002 ,3. Pierre R. Roberge, "Corrosion Basics: An Introduction", 2nd Edition, NACE Press book 4. "
" 5831 82 59-09..6991 ,5. Geldriech E., "Microbial quality of water supply in distribution systems", Florida: CRC Press 6. "
7831" 8831 7. " " 15 1831 56-068. ASTM, "Standard test methods for corrosivity of water in the Absence of heat transfer", designation 4991 ,29-8862:D
.2991 ,9. Kerri k, "water treatment plant operation", third edition, vol.1, office of drinking water01. " " 7831.5002 11. Standard method for the examination of water & wastewater, Edition 21. " " 5831.
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31. " ". 7831. 41. " "GIS - 7831. 51. " " 3 8831 061 55116. Aiman E. Al-Rawajfeha, Ehab M. Al-Shamaileh, "Assessment of tap water resources quality and its potential of scale formation and corrosivity in Tafila Province, South Jordan", Desalination Volume 233-223 206, Issues 1-3, 5 February 2007, Pages 17. G. Ptzaya, G. Sthlb, F. H. Krmnb and E. Klmnb, "Modeling of scale formation and corrosion 741-731 from geothermal water", Electrochimica Acta, Volume 43, Issues 1-2, 1998, Pages
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Evaluation of Corrosion and Precipitation Potential in Ardebil Drinking Water Distribution System by Using Langelier & Ryznar IndexesMokhtari S.A.1, Aalighadri M.2, Hazrati S.2, Sadeghi H.2, Gharari N.2, Ghorbani L.31. Instructor of Environmental Health, Ardabil University of Medical Sciences, E-mail: [email protected] 2. Environmental Health Department, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran 3. BSc in Environmental Health, Ardabil University of Medical Sciences
ABSTRACTBackground and Objectives: Corrosion and sedimentation potential is one of the main factors in water quality control issues. Water tendency towards each of them, can be play very effective role in the transmission and distribution of drinking water in terms of economic and health aspects. The purpose of this study was evaluation of chemical quality, corrosive and sedimentation rate of drinking water in Ardabil water supply network and providing relevant solutions for probable problems. Methods: In a cross-sectional research conducted in autumn 2009, the city was divided into 12 blocks and water samples were taken in two instances (in the first half of October and the second half of December). Parameters of alkali, calcium hardness, electrical conductivity, temperature and pH were determined. Water samples were handled according to standard procedures, and corrosion and sedimentation potential were estimated using indicators Lanzhlyh (LSI) and Rayznr (RSI) . Results: The results of tests and calculations showed that the respective value for average of LSI index in the first and 2nd stage of water sampling was -0.23 and -0.46, and the average for RSI index in the first and 2nd stage of sampling was 7.98 and 8.24, respectively. Based on LSI index, drinking water in the water supply system has a tendency to corrosion in 9 and 12 stations in the first and second sampling campaigns, respectively; with the other stations tending to have sedimentation. However, according to RSI index six stations had tendency to corrosion and others was balanced in the first samples. For the second samples, ten stations tend to have corrosive property and the others had conditions of relative equilibrium. Conclusion: Based on the results obtained, water in Ardabil drinking water supply have slight tendency to corrosion and water quality must be controlled for the relevant parameters e.g. pH, alkali, and hardness. Application of corrosion-resistant pipes and materials should be considered in drinking water networks. Key words: Corrosion, precipitation, Langelier & Ryznar Index, distribution system, Drinking Water, Ardabil