Mathematical modelling of regeneration the filtering media bed of granular filters

摘要

© 2018 AMSE Press. All rights reserved.The work of predominant majority of filters in technological schemes of water treatment is based on alternation of two processes, filtering and washing. The presence of multi-component impurities in washing waters has a negative impact on the processes of their treatment and leads to a significant deterioration of the waste effluent quality. The solution of the problem is achieved by separating the contamination of washing water at a phase-dispersed state reducing the concentration of ferruginous compounds and bringing their concentration in washing waters to a level that is acceptable to discharging into waste water treatment facilities or reservoirs. Developed a mathematical model of the process of the liquid treating from multi-component contaminations, which takes into account the interaction of hydrodynamic parameters, change of hydraulic properties of the medium, initial and boundary conditions of modelling problem of the beds regeneration taking into account the appropriate values of the concentrations of contamination in the liquid and deposit, the reverse effect on the filtration components, in particular, to the porosity and the coefficient of the separated deposit particles. Determined the time of the protective action of the filter media bed and the time of its regeneration, taking into account the values of the concentrations of contaminations in the water submitted for purification, the filters media bed height and the speed of the washing water movement.