Estimation of settling velocities

被引:23
作者
Chancelier, JP [1 ]
Chebbo, G [1 ]
Lucas-Aiguier, E [1 ]
机构
[1] Ecole Natl Ponts & Chaussees, Cergrene, F-77455 Marne La Vallee 2, France
关键词
settling velocity; density function; identification; sedimentation model; suspended solids; settling columns; sewage;
D O I
10.1016/S0043-1354(98)00114-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This paper deals with settling velocities estimation, which is of major importance as settling velocities estimation is a prerequisite for properly dimensioning settling tanks. Several measurement procedures are presented and analyzed here. A general framework for identification which includes modelisation of the settlers and identification techniques is developed hers-in. In this paper, we demonstrate that for a parametric set of settling density functions rho(d nu) = Sigma(i=1)(N) theta(i)rho(i)(d nu) the mathematical relation between the measures M(t(i))(i)=(1,N) and the unknown quantities (theta(i))(i=1,N) take the following linear form M(t(i)) = Sigma(k=1)(N) theta(k)integral(R)phi(x)(t(i), nu)rho(k)(d nu) This relation makes it possible to have access to statistical errors in settling velocity estimates (theta(i)) in assuming that a statistical model of measurement errors (M(t(i))) exists. The consequences of the choice of sampling times (t(i))(i)=(1,N) on the quality of the estimation are also investigated. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3461 / 3471
页数:11
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