(全英文)水处理课件——过滤
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
.01 .1 1 5 10 50 90 95 99 99.9 99.99
0.1 1
10
Percent of Media with Smaller Diameter
Naturally Occurring Sand Processed Filter Sand
20 30 70 80 P a r t i c l e D i a m e t e r , m m Size Distribution of Typical Naturally Occurring and Processed Filter Sand
Figure by MIT OCW.
Adapted from: MWH, J. C. Crittenden, R. R. Trussell, D. W. Hand, K. J. Howe, and G. Tchobanoglous.Water Treatment: Principles and Design . 2nd ed. Hoboken, NJ: John Wiley & Sons, 2005, p. 881.
Typical properties of filter media used in rapid filters*
PROPERTY UNIT GARNET LLMENITE SAND ANTHRACITE GAC Effective Size, ES mm 0.2 - 0.4 0.2 - 0.4 0.4 - 0.8 0.8 - 2.0 0.8 - 2.0 Uniformity Coefficient,
UC UC 1.3 - 1.7 1.3 - 1.7 1.3 - 1.7 1.3 - 1.7 1.3 - 2.4 Density, �� g/mL 3.6 - 4.2 4.5 - 5.0 2.65 1.4 - 1.8 1.3 - 1.7
Porosity, � % 45 - 58 Not available 40 - 43 47 - 52 Not
available Hardness Moh 6.5 -7.5 5.6 7 2 - 3 Low
* = Not Available
Figure by MIT OCW.
Adapted from: MWH, J. C. Crittenden, R. R. Trussell, D. W. Hand, K. J. Howe, and G. Tchobanoglous. Water Treatment: Principles and Design. 2nd ed. Hoboken, NJ: John Wiley & Sons, 2005, p. 882.
Figure by MIT OCW.
Adapted from: Binnie, C., M. Kimber, and G. Smethurst. Basic Water Treatment. 3rd ed. Cambridge, UK: Royal Society of Chemistry, 2002.
100
10-1
10-2
10-3 10-4 10-5
10-6
10-8 10-7 10-6 10-5 10-4
Sedimentation �� = 2650 kg/m 3
Sedimentation �� = 1050 kg/m 3
Sum 2 Sum 1
Interception
c = 0.5 mm, v = 5 m/h, o C)
Particle Diameter, m
Diffusion
Influence of Particle Size and Density on Filtration Transport Efficiency (d and T = 25T r a n s p o r t E f f i c i e n c y Figure by MIT OCW.
Adapted from: MWH, J. C. Crittenden, R. R. Trussell, D. W. Hand, K. J. Howe, and G. Tchobanoglous.Water Treatment: Principles and Design . 2nd ed. Hoboken, NJ: John Wiley & Sons, 2005, p. 912.
Figure by MIT OCW. Adapted from: Yao, K.-M., M. T. Habibian, and C. R. O'Melia. "Water and Waste Water Filtration: Concepts and Applications." Environmental Science & Technology 5, no. 11 (November 1971): 1105-1112.
Figure by MIT OCW.
Adapted from: O'Melia, C. R., and J. Y. Shin. Removal of particles using dual media filtration: modeling and experimental studies." Water Science and Technology: Water Supply 1, no. 4, (2001): 73-79.
Figure by MIT OCW.
Adapted from: Binnie, C., M. Kimber, and G. Smethurst. Basic Water Treatment. 3rd ed. Cambridge, UK: Royal Society of Chemistry, 2002.