Reducing the risks of water and territory pollution by toxic metal-containing effluents of machine-building industry

The article is devoted to the baromembrane method for cleaning washing waters of degreasing sites and for the bright nickel plating of galvanic productions. The authors analyzed specific features of technologies for part metallization in terms of the formation and separation of washing wastewater flows for their separate cleaning. Studies were carried out on the membrane extraction of nickel sulfate and sodium phosphate compounds on two types of membranes: nanofiltration OPMN-P and reverse osmosis Hydranautics ESPA-1. High selectivity (98-99,9%) and specific productivity of OPMN-P membranes (25 l/m2 per hour) were proved during the extraction of nickel sulfate and sodium phosphate at concentration ranging from 50 to 200 mg/l specific to washing water of the processes of degreasing and bright nickel plating. The advantage of using nanofiltration membranes OPMN-P over reverse osmosis Hydranautics ESPA-1 membranes was substantiated. A technological scheme to create a closed water supply system at these sites was developed. © 2019 Published under licence by IOP Publishing Ltd