Technological model of water contact iron removal

Abstract

Different types of filters are used to remove iron from underground water, one of them is foam polystyrene. Depending on the chemical water composition, tasks for water supply and other working conditions of iron-removing filters, it is necessary to define an exact grain size, specific granulometric composition, the thickness of the layer and the adequate rate of filtration. This kind of problems is multifactorial and its solution is based on the mathematical modelling.As a rule, two parallel processes considered during iron removal of underground water in filters: efficiency of water treatment and growth of head losses. Therefore, the model of water iron removal based on two main blocks, clarifying block takes into account the material balance and kinetics of the process; hydrodynamic block describes the dynamics of head loss in the granular loading. The kinetics of the detention of iron compounds in granular loading consists of two mutually opposite processes. With an increase of the amount of adsorption-catalytic precipitate, the rate of sorption of iron compounds and oxidation of ferric iron increases and the efficiency of iron-removing increases. On the other hand, with decreasing porosity of loading the true velocity of the fluid increases, that reduces the intensity of adhesion of iron compounds.Developed mathematical model allows for determining optimal values of structural and technological parameters of iron-removing filters taking into consideration the specific filtering conditions.

Modeling of the Contact Removal of Iron From Groundwater

“…p is pressure. Unlike to (see [13]) for the more general case the pressure p = p (x, t) should be determined by solving equation ∂ ∂x κ (ρ) ∂p ∂x = ∂σ(ρ)p ∂t which is obtained on the base of the mentioned above equation of continuity and state div v = ∂σ(ρ)p ∂t for boundary p (0, t) = p * (t), p (L, t) = p * (t) (0 < t < ∞) and initial p (x, 0) = p * * (x) (0 < x < L) conditions rather smooth and coherent in corner points G = {(x, t) : 0 < x < L, 0 < t < ∞} functions are defined. During solving task it is possible to calculate the value of grad p, in particular the pressure difference ∆P = p * (t) − p * (t) between the filter inlet and outlet.…”

Limiting horizontal water filtration using drainage-screened modules

“…When calculating parameters, the DSM was based on the assumption that loss of water pressure when it comes from the undrained area [MARTYNOV et al 2018;SAFONYK et al 2018]: 1) losses on groundwater filtration (losses per distance); 2) losses for creating a resistance on the AFS (local losses) that can be determined using the basic law of laminar filtration (Darcy's formula). The motion of groundwater under the AFS laminar and is consistent with Darcy's law, in addition, it is steady, uneven, that is characterized by the presence of curvilinear living cross sections.…”

Improvement technology of water regulation and methods of calculating the parameters of modular drainage systems on the lands of the humid zone

“…Climate change must also be taken into account. So, the current state of water management systems in the humid zone requires new effective approaches to both construction and reconstruction [1][2][3][4], as well as to the design of regulatory drainage networks [5].…”