SVIBOR - Project code: 2-08-180


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 2-08-180


Main researcher: MUSTAPIĆ, MIJO (32854)

Type of research: applied
Duration from: 01/01/91. to 12/31/94.

Papers on project (total): 55
Institution name: Fakultet strojarsva i brodogradnje, Zagreb (120)
Department/Institute: Department of Power Engineering Laboratory for Water, Fuel and Lubricant
Address: I. Lučića 5
City: 10000 - Zagreb, Croatia
Phone: 385 (0)1 6111-944
Fax: 385 (0)1 514-535

Summary: Concentrations of same gases, especially oxygen, carbon dioxide and ammonia, have a major influence on character of water in which they are dissolved. Processes of aeration and degasation, or generally said transportation of gas in or out of liquid phase, depends on various conditions. These conditions are consisted of temperature, pressure, but also of aeration/degasation system that is used. The investigation of gas transportation from phase to phase is partly theoretical but mostly experimental.

Keywords: oxigen, carbon dioxide, ammonia, scaling, corrosion, degasation, aeration, difusion, Ficks law

Research goals: Besides the basic convection in convenient conditions, the outlet of same gas from e.g. drop of liquid could be realized only if concentration gradient is present (Fick's law). Therefore, the diffusion constant depends on gas and liquid type, temperature, pressure, surface tension and most of all on degasation system. Special cases are degasation by spraying fluid into air or steam, system of counter-stream fluid leading over the contact plates or in other words spraying gas or steam in liquid. Consequently, degasation effect is changed with contact area and liquid layer depth. The purpose of this research is an investigation of the process, mechanism of transport gas-liquid, and especially, the energy spending analysis particularly for each degasation system. An additional aim is investigation of boundary conditions of gas concentration alternation due to disturbances in water solubility equilibrium. Therefore, it is to define boundary concentrations, especially, of carbon dioxide when scale formation is up to occur. Of special interest is influence of other mineral salts, beside calcium, on solubility of calcium carbonates and carbon dioxide. Besides mentioned, the matter of research is process of dissolvation gasses in water, especially aeration systems, - effect and degree of saturation with oxygen, and influence of different concentrations on oxidation process of iron, manganese and ammonia. Expected scientific contribution is based upon closer comprehension about gas transportation from one to another phase and understanding how disturbances leads from an old to a new equilibrium.


  1. Name: Idejno rješenje povećanja kapaciteta i poboljšanja kvalitete vode Vodovoda Osijek
    Type of achievement: Technology
    Authors: Prof.dr. Mijo Mustapić, Doc.dr. Nikola Ružinski

  2. Name: Studija o mogućnosti čišćenja generatora pare koji ima naslage loživog ulja - koksa
    Type of achievement: Studies of conduct
    Authors: Prof.dr. Mijo Mustapić

  3. Name: Moderni postupak pripreme pitke vode koja ima arsena i povećani sadržaj mikroba i organskih tvari Vodovoda Garešnica
    Type of achievement: Technology
    Authors: Prof.dr. Mijo Mustapić, Doc.dr. Nikola Ružinski

  4. Name: Moderni postupci pripreme dodatne rashladne vode za hlađenje tehnološke vode u DI Bjelovar
    Type of achievement: Technology
    Authors: Prof.dr. Mijo Mustapić. Doc.dr. Nikola Ružinski

  5. Name: Idejno rješenje pripreme bunarske vode koja sadrži metan, mangan i željezo - Vodovod Vinkovci
    Type of achievement: Technology
    Authors: Prof.dr. Mijo Mustapić, Doc.dr. Nikola Ružinski

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Last update: 10/09/95