Ceolito miltelių adsorbcijos efektyvumo organinių medžiagų iš požeminio vandens šalinimui eksperimentiniai tyrimai ir skaitmeniniai apskaičiavimai

Abstract

The mathematical modelling of any environmental engineering process is made up minimally of the following two steps: 1. After studying the physical, chemical process, identify the essential and dominant mechanisms, e.g. adsorption of organic matters dependent on the initial concentration and amount of adsorbent (Fig. 2/. 2. Develop a mathematical expression for the system. Typically, this may he as simple as a single algebraic or differential equation or as complex as a set of differential equations, e.g. the Freundlich Isotherm [Qs = AfCs bf], where aF and bF are the Freundlich constants. • aF expresses the adsorbent capacity (l/g); • bF (unitless) is the heterogeneity factor. Its value ranges between 0 and 1, the more heterogeneousthe surface, the closer bF value is to 0. This izotherm is widely recommended due to its accuracy. It gives more accurate results than the Langmuir izotherm for a wide variety of this izotherm is widely recommended due to its accuracy. It gives more accurate results than the Langmuir izotherm for a wide variety of heterogeneous adsorption systems. Though accurate and mathematically convenient, one drawback is that the Freundlich izotherm does not converge to Henry's law at low surface coverage and there fore fails to describe equilibrium as q ->0 and is thermodynamically inconsistent (Fig. 2). Figure Nr.2 is illustrates the adsorption equilibrium plots as proposed by Freundlich. Tables Nr1-2 evaluates the Langmuir and Freundlich constants. The effectiveness of organic matter removal via the adsorption by natural zeolites are aF=6l,506 mgO2/l (Chemical Oxygen Demand Bichromate Method).