Research Papers by Gyula Vatai

In this paper, nanofiltration (NF) combined with continuous variable volume diafiltration (CVVD) of cottage cheese whey (also known as acid whey) was investigated to simultaneously concentrate and partially demineralize it. The experiments were carried out in a laboratory NF equipment using a flat s

In this study the applicability of membrane distillation (MD) was investigated to produce black-currant juice concentrate. For the experiments enzyme treated, pre-filtered by microfiltration and pre-concentrated by reverse osmosis fruit juice was applied. The measurements were carried out in a hollo

The results in case of concentration by nanofiltration are favorable, so it is worth to go on G.J. McDougall, S. Gordon and R. Brennan, et al., Anthocyanin-flavanol condensation products from black currant (Ribes nigrum L.), J. Agric. Food Chem., 53(25) (2005) 7878–7885. R. Bagger-Jorgensen, A.S. Me

From the experiments and the mass transfer model the following inferences can be drawn: • The calculated diffusion coefficient of humic acid is in a good agreement with the literature value. • The Mulder-equation in laminar flow regime fits well the ultrafiltration measurements of humic acid contain

Red wine contains many compounds which have a beneficial effect on human health. The aims of this study were to concentrate the valuable components of wine by nanofiltration, to describe the mathematical model of the permeate flux and to estimate the cost of the process. Laboratory-size equipment wi

Currently it is very important that good-quality products are produced at an adequate price. In the case of instant coffee there are several production technologies. Some of these technologies do not provide good quality, and others — while the quality of the product is good — the cost is too high a

Whey is a by-product of cheese production which is used mainly as animal feed or released into the wastewater treatment process, although it is rich in valuable components. Recent developments in membrane filtration have provided exciting new opportunities for large-scale protein and lactose fractio

The aim of this study was to investigate membrane filtration for must processing and to carry out a complex method for preservation and concentration of grape must. In the experiments white and red grape-juice samples were used. After the transportation of the samples in to the laboratory the impact

The importance of wastewater treatment in the food industry is growing nowadays, because of the rising cost of water and because of environmental pollution. The aim of this study was to decrease the chemical oxygen demand (COD) of two different wastewaters originated from the food industry. If the t

To produce healthy drinking water is the main problem almost all over the world. The aim of this study is to find an efficient method to remove humic substances (HS) from water, because HS cause some types of cancer when they react with chlorine or other disinfection materials composing disinfection