Experimental Research on Flocculation-Settling Property of Silt in Rivers and Lakes

WANG Xi; ZHU Yong-hui; CHAI Zhao-hui; LI Ling-yun

doi:10.11988/ckyyb.20180972

PDF(1903 KB)

Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (1) : 13-17. DOI: 10.11988/ckyyb.20180972

RIVERLAKE SEDIMENTATION AND REGULATION

Experimental Research on Flocculation-Settling Property of Silt in Rivers and Lakes

WANG Xi^1,2, ZHU Yong-hui^1,2, CHAI Zhao-hui^1,2, LI Ling-yun^1,2

Author information +

History +

Abstract

Flocculation-settling property is an important research subject to be improved in the treatment of river and lake dredging silt. The effects of particle size distribution, initial sediment concentration, and high-molecular polymer on flocculation and settling property of dredging silt were examined through settling experiments with the settling velocity of interface between clear and turbid liquid and turbidity of supernatant as indexes. The dredging silts from the Shahu Lake, Nanhu Lake, and Guanqiao Lake in Wuhan were taken as research object. Besides, the influence of settling column size on experiment result was also investigated. Results reveal that the smaller the particle size is, the slower the silt flocculates and settles, and the clearer the supernatant fluid is. The settling velocity decreases with the increase of initial sediment concentration; but the influence of initial sediment concentration weakens when it reaches a threshold value. High-molecular polymer promotes the flocculation-settling property of dredging silt. In addition, the size of settling column has little impact.

Key words

silt in river and lake / flocculation and settling / settling experiment / settling velocity of interface between clear and turbid liquid / turbidity of supernatant

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

WANG Xi, ZHU Yong-hui, CHAI Zhao-hui, LI Ling-yun. Experimental Research on Flocculation-Settling Property of Silt in Rivers and Lakes[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(1): 13-17 https://doi.org/10.11988/ckyyb.20180972

References

[1] ZHANG J F, ZHANG Q H, MAA J P Y, et al. Lattice Boltzmann Simulation of Turbulence-induced Flocculation of Cohesive Sediment[J]. Ocean Dynamics, 2013, 63(9/10): 1123-1135.
[2] WINTERWERP J C. A Simple Model for Turbulence Induced Flocculation of Cohesive Sediment [J]. Journal of Hydraulic Research, 1998, 36(3): 309-326.
[3] 王党伟, 吉祖稳, 邓安军, 等. 絮凝对三峡水库泥沙沉降的影响[J]. 水利学报, 2016, 47(11): 1389-1396.
[4] GUO L C, HE Q. Freshwater Flocculation of Suspended Sediments in the Yangtze River, China[J]. Ocean Dynamics, 2011, 61(2/3): 371-386.
[5] FANG H W, HUANG L, WANG J Y, et al. Environmental Assessment of Heavy Metal Transport and Transformation in the Hangzhou Bay, China[J]. Journal of Hazardous Materials, 2016, 302: 447-457.
[6] FU J J, CAI W M. Application of a Well-designed Cationic Polyelectrolyte for Activated Sludge Dewatering[J]. Journal of Chemical Engineering of Japan, 2007, 40(12): 1113-1120.
[7] 高健磊,闫怡新,吴建平,等.城市污水处理厂污泥脱水性能研究[J].环境科学与技术, 2008,31(2):108-111.
[8] 朱伟,闵凡路,吕一彦,等. “泥科学与应用技术” 的提出及研究进展[J]. 岩土力学,2013, 34(11): 3041-3054.
[9] KIM A S, STOLZENBACH K D. Aggregate Formation and Collision Efficiency in Differential Settling[J]. Journal of Colloid and Interface Science, 2004, 271(1): 110-119.
[10]SON M,HSU T J. Flocculation Model of Cohesive Sediment Using Variable Fractal Dimension[J]. Environmental Fluid Mechanics, 2008, 8(1): 55-71.
[11]XU W Y,GAO B Y,YUE Q Y,et al. Effect of Shear Force and Solution pH on Flocs Breakage and Re-growth Formed by Nano-Al₁₃ Polymer[J]. Water Research, 2010, 44(6): 1893-1899.
[12]MAGGI F, TANG F H M. Analysis of the Effect of Organic Matter Content on the Architecture and Sinking of Sediment Aggregates[J]. Marine Geology, 2015,363:102-111.
[13]ANNANE S, ST-AMAND L, STARR M, et al. Contribution of Transparent Exopolymeric Particles (TEP) to Estuarine Particulate Organic Carbon Pool[J]. Marine Ecology Progress Series, 2015, 529: 17-34.
[14]陈洪松, 邵明安. NaCl对细颗粒泥沙静水絮凝沉降动力学模式的影响[J]. 水利学报,2002(8):63-67.
[15]吴荣荣,李九发,刘启贞,等. 钱塘江河口细颗粒泥沙絮凝沉降特性研究[J]. 海洋湖沼通报,2007(3):29-34.
[16]汤德意, 翁浩轩, 史燕南. 水库疏浚底泥絮凝沉降室内试验研究[J]. 长江科学院院报, 2018, 35(4): 31-36.
[17]李享,雷学文,孟庆山,等. 淤泥絮凝脱水的室内试验研究[J]. 人民长江,2013, 44(13): 67-70.
[18]王诗妮,蒋雪中,何青. 长江口不同河段表层细颗粒泥沙絮凝特性[J]. 泥沙研究,2017, 42(2): 47-53.
[19]杨铁笙,熊祥忠,詹秀玲,等. 粘性细颗粒泥沙絮凝研究概述[J]. 水利水运工程学报,2003(2): 65-77.