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Application Of Numerical Modeling In Quantitative Assessment Of BHT Dispersion In PE-HD Pipes

100%
Musz A., Kowalska B.
Ecological Chemistry and Engineering S
|
2015
|
vol. 22
|
issue 2
219-229
EN
PE-HD water pipes are exposed to adverse environmental conditions, both during production and their subsequent use in the civil engineering. Several organic compounds migrating into water may lead to deterioration of water quality, especially its taste and odour. Commonly used antioxidant BHT and its products of degradation are leached into water as a result of degradation of the PE-HD pipes material. This paper presents the results of laboratory tests of BHT concentration changes in water circulating in the PE-HD close loop pipe of 30 m length as well as of numerical studies based on data obtained by the laboratory measurements. Numerical calculations were performed using the commercial software Fluent, Ansys Inc., based on the computational fluid dynamics (CFD) principles. The analysis of water samples confirmed the migration of the antioxidant from the pipe material into the water. The results of numerical analysis gave good agreement with the measured values.
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Water Quality Correction Within Water Distribution System

81%
Kowalski D., Kowalska B., Hołota E., Choma A.
Ecological Chemistry and Engineering S
|
2015
|
vol. 22
|
issue 3
401-410
EN
Water suppliers can be treated as production companies whose main product is water delivered to their customers. The article presents problems connected with management of such companies in the conditions of secondary contamination in water distribution systems. This phenomenon exists in water networks all over the world. Its’ presence is particularly visible in countries of former communistic block. In the article particular attention was devoted to the issue of water quality correction in the analysed systems. In the case of water distribution systems, former quality correction methods consisted in special treatment of water pumped into the system, flushing and cleaning of water pipes. In both these cases identification of water quality deficiencies resulted in significant water loss. The situation reflects management processes applied in the manufacturing industry of the 1940s. The authors of this paper put forward the concept of three water quality correction methods which would not entail such considerable water loss. The methods in question are intended for different network types. The implementation of proposed solutions could set new standards in management of distribution systems of water providers.
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