Treatment of Wastewater from the Confectionery Industry Using Pressure Membrane Processes？

The aim of the research presented in this article was to present the possibilities of wastewater treatment coming from the confectionery plant using pressure membrane techniques. Nanofiltration was carried out in a pressure dead-end filtration set up (Osmonics type GH-100-400) with a cell capacity of 350 cm 3 equipped with a magnetic stirrer. Four flat nanofiltration membranes were used during the tests. The efficiency of the process was estimated by determining the purified wastewater volumetric stream and based on the removal degree of pollution load. The nanofiltration membrane, thanks to which the highest cleaning results were obtained, is a flat composite membrane, with the symbol NF-270, with the polyamide film layer of the Dow Filmtec company. The degree of removal of COD after nanofiltration in this membrane was 98.7%. It was found, that wastewater treated by pressure membrane techniques in the confectionery industry can be reused, for example, for irrigation of agricultural land or gardens, and for machines and equipment washing (closing water circuits). The use of NF processes enables wastewater treatment to such a degree that it can be drained to a natural receiver