Abstract The present study aims at development of a mathematical model for the fixed-bed column adsorption that relates reactor parameters with breakthrough curve. Effects operating like bed height, flow rate, initial adsorbate concentration on were investigated by using various curves. arbitrary constants developed found to be dependent kinetics. proposed showed incredible results (Breakthroug...

This paper presents the results of a study aimed at estimating groundwater pollution source location from observed breakthrough curves using neural networks. Two different methods of presenting the breakthrough curves to the ANN are investigated. The feed-forward multi-layer perceptron (MLP) type artificial neural network (ANN) models are employed. The ANNs were trained using the back-propagati...

Microbial breakthrough curves of 12 soils, generated by the application of dairy shed effluent followed by continuous artificial rainfall for one pore volume at 5 mm h(-1) onto large undisturbed soil cores, have been ranked as high, medium, or low potential for microbial bypass flow. The ranking is based on the position of the peak in the breakthrough curve. Knowledge of soil properties that af...

The biosorption of copper by inactivated biomass of the brown seaweed Sargassum baccularia, immobilized onto polyvinyl alcohol (PVA) gel beads, was investigated using a laboratory-scale packed bed column. Continuous-flow column tests were performed to determine breakthrough curves at two different column lengths. In both cases, a very broad trailing edge of the breakthrough curve was observed, ...

Understanding the dynamics of fixed-bed adsorption columns for modeling is a demanding task due to the strong nonlinearities in the equilibrium isotherms, interference effects of competition of solutes for adsorbent sites, mass transfer resistances between fluid phase and solid phase, and fluid-dynamic dispersion phenomena. The interplay of these effects produces steep concentration fronts, whi...

Conservative-tracer data are used for the parameterization of mixing-controlled reactive transport. Temporal moments of the tracer breakthrough curve integrated over the outflow boundary of the domain yield the average velocity and the path-averaged macrodispersion coefficient. On the basis of this information alone, no distinction is possible between spreading and mixing of the tracer. Analyzi...

PURPOSE We constructed a risk prediction instrument stratifying patients with primary vesicoureteral reflux into groups according to their 2-year probability of breakthrough urinary tract infection. MATERIALS AND METHODS Demographic and clinical information was retrospectively collected in children diagnosed with primary vesicoureteral reflux and followed for 2 years. Bivariate and binary log...

People spend most of their time indoors. The volatile organic compounds (VOCs) in indoor air represented by toluene inevitably affect people's health. Activated carbon can effectively reduce VOCs pollution. experiments the previous studies were carried out at concentration tens or hundreds ppm, which could not reflect actual adsorption performance activated conditions. In this study, a method w...