Izvleček
V članku je obravnavan disperzijski model za reaktor z vzdolžnim odtokom in z zmesjo dveh komponent substanc (vode in tuje substance). Sestav zmesi je prikazan s pomočjo koncentracije C, ki definira razmerje ene od substanc, ki "prihaja" v sestav druge, proti skupni masi tekočine v danem elementu prostornine. V primerjavi z idealnimi reaktorji s popolnim mešanjem, ko je difuzija lahko zanemarljiva, je treba za neidealne reaktorje upoštevati difuzijo in konvektivno (turbulentno) mešanje tekočin. To so lahko usedalniki z vzdolžnim odtokom ali oksidacijski jarki, kjer lahko spreminjamo usedanje in razgradnjo organskih snovi (porabo kisika) ter nitrifikacijo. Pri projektiranju je treba poznati časovno porazdelitev koncentracije v reaktorju, da lahko na ta način ocenimo porabo oziroma proizvodnjo v reaktorju. Upoštevani so različni vhodni (začetni) in robni pogoji

Ključne besede: reaktor, difuzija, disperzija, koncentracija, pretok, mešanje, usedalniki
Izvirni znanstveni članek   UDK 628.34

Abstract
The paper discusses a dispersion model for a reactor with a longitudinal outlet and a mixture of two component substances (water and a foreign substance). The composition of the mixture is given using the concentration C, which is defined as the relationship between one of the substances that combines with the other, compared to the total mass of liquid in a given volume element. With regard to ideal reactors with perfect mixing, when diffusion is negligible, for non-ideal reactors it is necessary to take into account the diffusion and convectional (turbulent) mixing of the liquids. These are the horizontal flow sedimentation tanks or oxidation ditch, where the sedimentation, biodegradation of organic matter (oxygen consumption) and nitrification occur. In project design, the time distribution of the concentration in the reactor must be known, so that, in this way, the consumption or production in the reactor can be estimated. Various entry (initial) and boundary conditions are considered.

Key words: reactor, diffusion, dispersion, concentration, fiow, mixing, sedimentation tank
Scientific paper   UDK 628.34