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原文传递 Delaying Effect of Extracellular Polymer Substances on Fluid Mud Consolidation and Application for Nautical Depth

题名：	Delaying Effect of Extracellular Polymer Substances on Fluid Mud Consolidation and Application for Nautical Depth
其他题名：	Akkache,S.,Seyssiecq,I.,and Roche,N.(2013)."Effect of exopolysaccharide concentration in the rheological properties and settling ability of activated sludge."Environ.Technol.,34(22),2995-3003.
正文语种：	英文
作者：	Qi Xiu Pang
关键词：	Cohesive sediment;Fluid mud;Extracellular polymer substance (EPS);Consolidation;Nautical depth;Critical EPS contents
摘要：	Microorganisms have been used to delay fluid mud consolidation and to keep fluid mud navigable. However, bacteria and extracellular polymer substances (EPSs) that delay sediment consolidation have not been studied widely, and it has taken many years to make inorganic chemoautotroph bacteria and EPSs effective. To understand the effect of EPSs on consolidation and to find new methods of applying EPSs at nautical depths, a strain of bacteria, Burkholderia vietnamiensis, was recently isolated and screened from sediment; it was cultured to secrete EPSs to be added directly to fluid mud in a series of consolidation experiments. The experimental results showed that the EPS consisting of polysaccharides as the main component can greatly reduce sediment settling and consolidation velocity. Also, when the EPS content was relatively high, the fluid mud consolidated at a slower rate. A self-weight consolidation in the settling regime was best predicted by an exponential equation, and a permeability regime was best predicted by a logarithmic equation. The equilibrium density of mud in the effective stress regime decreased exponentially with increasing EPS content. The application time of the nautical depth might be delayed greatly by adding 0.68 g/L EPS directly into the Cangnan Power Plant Harbor, Zhejiang Province, China. The new concept of direct EPS addition into fluid mud might be a solution to the problem of slow growth of inorganic chemoautotroph bacteria and EPSs, and it might be helpful to promote the application of EPSs at nautical depths in new harbors.
出版年：	2018
论文唯一标识：	P-108Y2018V144N03002
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/(ASCE)WW.1943-5460.0000441
期刊名称：	Journal of Waterway, Port, Coastal, and Ocean Engineering
拼音刊名(出版物代码)：	P-108
卷：	144
期：	03
页码：	1-6