Development of complex wastewater treatment of galvanizing lines

The prospective of increasing of environmental safety level for industrial enterprises as a result of the implementation of new complex wastewater treatment technology are considered. An analysis of literary sources was carried out regarding the effectiveness of the existing methods of wastewater treatment that contain compounds of heavy metals. The efficiency of iron ion extraction was investigated by processing of steel pickling solutions using the ferritization with various activation methods of the reaction mixture. X-ray phase analysis of the obtained ferritization sediments confirmed the presence of highly dispersed ferromagnetic phases of iron oxides and oxyhydroxides. The sorption capacity of magnetite sediment obtained by ferritization on the efficiency of zinc ion extraction from the wastewater of the galvanic line was studied. The influence of pH value and ultrasound on sorption treatment of washing wastewater by magnetite sediment was determined. When using ultrasound for sorbent treatment and raising the pH to 10, the residual concentration of zinc ions in the washing wastewater decreases to 0.31 mg/dm3, the degree of purification is 98.9%. Such water meets the standards for its use in the operations of washing parts at electroplating facilities or discharge into the city's central sewage system. The prospects for the utilization of spent sorbents in powder paint and varnish materials as a result of the inclusion in their composition of ferritization products obtained from electroplating waste are considered. The use of ferromagnetic waste from sorption treatment improves the corrosion resistance of the resulting coatings compared to traditional ones. The implementation of research results at enterprises will prevent environmental pollution by toxic substances, change outdated production technologies and obtain from production waste materials for corrosion protection of metal construction.