Dr inż. Marek Kalenik

Mgr inż. Dariusz Morawski

The experimential research on the turbidity and effectiveness of aerating water in pipe aerator with the Białecki rings

This article presents an analysis of results of the research on the turbidity and oxygen content in water after the pipe aerator. Turbidity and oxygen content in water, measurements was conducted in conditions of technical exploitation of water treatment plant. The research embraced the pipe aerator with the Białecki rings which was made of stainless steel about the diameter of 12 mm. It was found that together with the growth of the flow of air at the given flow of water, the content of oxygen in water and her turbidity is increasing proportionally. However together with the growth of the flow of water at the given flow of air, the content of oxygen in water and her turbidity is decreasing. ...

Dr inż. Marek Kalenik

Dr inż. Piotr Wichowski

Mgr inż. Dariusz Morawski

Dr inż. Marek Chalecki

KINETICS OF WATER OXYGENATION IN PIPE AERATOR

The paper presents the results of investigations of the oxygen content in oxygenated water in a co-current pipe aerator with the diameter of 200 mm, with stainless steel Białecki rings with the diameter of 12 mm, for two cases: when the air is supplied by a compressor and when it is supplied by a jet pump. The oxygen content in the oxygenated water was assayed using an LDO oxygen sensor. The investigations of water oxygenation in the aerator were carried out during technical exploitation of the Scientific Research Water Station of Warsaw University of Life Sciences. The oxygen content O2 in the oxygenated water was measured for the set air flow rate Qp equal to 50, 100 and 150 dm3h1 and water flow rate Qw equal to 10, 15 and 20 m3h1. During the tests, the temperature T of the air supplied to the aerator was also measured. The water temperature was constant during the tests and it was equal to 12C. The oxygen content O2 in the oxygenated water and the temperature T of the air supplied to the aerator were measured every 10 seconds. For each air flow rate Qp and water flow rate Qw being set, three ...

Dr inż. Piotr Wichowski

Dr inż. Marek Kalenik

Dr hab. inż. Tadeusz Siwiec

Mgr inż. Dariusz Morawski

Determine of linear losses coefficients in PE and PVC pipes used in the pressure sewage system

To designing of the pressure sewage systems, built of pipes PE and PVC, essential are hydraulic calculations, which would consider physical properties of sewage. In the applying norm [PN-EN 1671 2001], missing right formulae which would consider these properties. In connection with it, in this article, remained introduced methodology and results of experimental researches, which was a pur-pose, determine empirical relation for calculate linear losses coefficients in pipes PE and PVC, during the pressure flow sewages. Showed that the flow of sewage had character in pipes of PVC and PE of flow in pipes hydraulic smooth, and linear losses coefficients s determined from experimental research in pipes of PVC and PE is taking comparable value, which in the range for the recommended speed v are bigger to value sBlasius calculated from the Blasiusa formula.     ...

Dr inż. Piotr Wichowski

Dr hab. inż. Tadeusz Siwiec

Dr inż. Marek Kalenik

Mgr inż. Dariusz Morawski

Tests of the application range of Colebrook-White formula for the calculation of linear hydraulic resistance in pressure sewage systems

The article compares linear hydraulic losses calculated from Colebrook-White, Prandtl-Karman and Blasius formulas with the measured on a test pressure in pipelines with the diameter of 63, 75 and 90 mm, made of PVC and PE. The pipelines were arranged in loops through which flew sewage with the suspension contents of about 460mg/dm3. As a result of the tests it was established that the accuracy of the Colebrook-White formula is higher than that of Prandtl-Karman and Blasius formulas (the only exception being the diameter of PVC63). However, it does not reflect properly the character of changes of linear pressure losses that accompany the increase of the speed. This character is better reflected by formulas for hydraulically smooth pipes, particularly by the Prandtl-Karman formula. Differences between values measured and calculated for the tested scope of diameters and speeds do not exceed 10%. In most cases, however, the calculated values are smaller than the measured ones.     ...