Destruction of Azo Dye Procion Red MX-5B in Flowing Plazma-Chemical Reactor

Background. Wastewater treatment from dyes is an actual and not fully resolved environmental problem. Insufficiently purified wastewater disrupts the ecological balance of natural reservoirs that are sources of water supply and increases the negative man-made impact on the environment. The existing purification technologies have a number of limitations both scientific and technical, and economic nature. Therefore, the innovative technology of plasma-chemical destruction in a liquid medium is proposed in the work. Objective. The aim of the paper is study of the plasma-chemical destruction of azo dye Procion red MX-5B. Methods. A plasma electrochemical unit with a modified plasmogenesis module was used to purify waste water contaminated with the dye. The concentration of Procion red MX-5B in the process of plasma-chemical treatment was determined by UV spectroscopy and spectroscopy in the visible region. Spectra of solutions of Procion red MX-5B were recorded on the Schimadzu UV2450 spectrophotometer, the wavelength range λ = 200–700 nm. Results. It was established that plasma-chemical treatment of azo dye Procion red MX-5B causes rapid destruction of its molecule. In the first stage, the molecule is split into two aromatic fragments. Subsequently, the degradation of intermediate aromatic compounds begins. Conclusions. It was determined that azo dye Procion red MX-5B can be successfully neutralized in the plasma chemical device. The resulting decomposition products have low toxicity and can be successfully neutralized by biological purification methods. In the future there are plans to study in more detail the degradation of the dye semiproducts and the possibility of their neutralization by combining plasmochemical destruction with subsequent biological purification