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Derivation of consolidation partial differential equations with non-linear flow characteristics on organic soil example

100%

Malinowska E. E., Bursa B. A., Szymanski A.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2014

tom 46

nr 4

Derivation of consolidation partial differential equation with non-linear flow characteristics is proposed. The non-linear flow characteristics are obtained from flow-pump test on organic soil and described with empirical relationship. Several reasons were crucial to perform tests on organic soil. Firstly organic soils are very compressible, so that results in high permeability changes. Even with small stresses organic soil deforms a lot. Secondly road embankments, flood control levees, dykes and dams are very often located on organic soil, so it is important to model deformations under these constructions. Thus to model consolidation process in soft organic soil one should consider as follows: physical and mechanical properties, non-linear stress-strain relationship, non-linear flow characteristics, and creep strains. This paper is focused mainly on non-linear flow characteristics that change with porosity and hydraulic gradient variations.

Determination of chlorite in drinking water and related aspects of environment protection

84%

Herman M., Wieczorek M., Matuszek M., Tokarczyk J., Stafinski M., Koscielniak P.

Journal of Elementology

2006

tom 11

nr 4

One possible method of drinking water treatment is chlorine dioxide disinfection. This technology, however, requires reliable control of its byproducts, including chlorite ions., which pose a threat to human health. In this paper an original procedure for flow indirect determination of chlorite in drinking water was described. This method relies on oxidization of chlorite ions by iron(III) in acid environment measurement of the spectrophotometric signal for the phenanthroline/iron(II) complex. The determinations were carried out by flow analysis with the use of a dedicated set of flow instruments. The method was used for analysis of natural samples collected from various water intakes in Kraków. The new analytic approach was compared with the routinely applied ion chromatography method.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Journal of Elementology

1 Bursa B. A.

1 Herman M.

1 Koscielniak P.

1 Malinowska E. E.

1 Matuszek M.

1 Stafinski M.

1 Szymanski A.

1 Tokarczyk J.

1 Wieczorek M.

1 2014

1 2006

Wyniki wyszukiwania

Derivation of consolidation partial differential equations with non-linear flow characteristics on organic soil example

Determination of chlorite in drinking water and related aspects of environment protection