Identification of infiltration/inflow origin and quantity in Queensborough´s sewer system

Submitter: Vodovody a kanalizace Hradec Králové a.s.
Duration: 2002 - ???
Contact person: Ing. David Stránský

Goal: To identify quantity and origin of infiltration/inflow, which affect treatment efficiency of waste water treatment plant (temperature drop of waste water, dilution of waste water) and increasing costs of treatment (due to pumping of greater amount of waste water).

Optimalization of Prague´s Central treatment plant screw-feeder pumping stations

Submitter: Pražské vodovody a kanalizace a.s.
Duration: 1/1999 - 6/1999
Contact person: Doc.Ing. Zdeněk Koníček

Evaluation of pumping stations behaviour and its optimalization is next study focusing on Prague´s Central Treatment Plant. Optimal operation scheme has been proposed for both, dry weather and wet weather conditions. The measures have been suggested with respect to decrease of negative effects of Prague´s urban drainage on receiving waters (Vltava River).

Influence of highway Slivenec - Jesenice on surface waters

Submitter: PROJEKTIV s.r.o. ing. J. Knotek
Duration: 2001 - 2003
Contact person: Mgr. Jana Nábělková

Separation of steel roll flakes using vortex separator - experimental study

Submitter: Sigma Lutín s.r.o.
Duration: 2001 - 2002
Contact person: Prof.Ing. Jaroslav Pollert, DrSc.

Water used for washing off and cooling of metal plate contains roll scales (small particles of steel), but this water needs to be recycled.
For separation of scales has been used gravitation vortex separation (vortex separator). Vortex moves scales to bottom center of a circular tank, where concentrated solution of scales is being drained out. Vortex separator was propose diameter 5,5 m, maximal inflow was 2708 l/s.
The separation efficiency was physically modeled in 1:5 size model and also mathematically by program FLUENT v5.4. Full size scale was modeled mathematically only. With help of 3D model the flow of water inside of vortex separator (splitting of inflow discharge to overflow and outflow) was simulated. For computer calculation of water flow was used k- model RNG (Renormalization Group) with Swirl Dominated Flow extension. Free surface was done with VOF (Volume of Fluid) model of multiphase flow.

Flow resistance of fiber-glass sewer pipe

Submitter: HOBAS a.s.
Duration: 2001
Contact person: Ing. Jaroslav Pollert ml., Ph.D.