Zin O. Principles of energy-saving cavitation technology for the wastewater treatment from aromatic compounds.

Zin O.I. Principles of energy-saving cavitation technology for the wastewater treatment from aromatic compounds. – Manuscript. Dissertation for a Candidate degree in Technical Sciences in specialty 05.17.21 – technology of water treatment – Lviv Polytechnic National University. Lviv, 2019. The dissertation presents the results of research aimed at establishing an effective method of treatment of aqueous media from aromatic compounds, especially benzene and toluene. The influence of cavitation processing on the treatment of aqueous media has been investigated. In particular, the influence of the temperature regime and the duration of treatment on the process of cavitation destruction of aromatic compounds in aqueous media has been established. The positive influence of oxygen on the course of the cavitational decomposition of benzene has been revealed. It has been established that in the presence of oxygen, the decomposition of benzene continues after the cavitation excitation has ceased if the amount of energy introduced into the system by ultrasound exceeds a certain threshold value, that is, the mechanism of cavitation initiation of the aromatic compounds decomposition is realized. It was first discovered that a high degree of treatment of wastewater from aromatic compounds is achieved by mixing cavitational treated and raw (untreated) wastewaters. The high efficiency of the gravitational decomposition of benzene has been confirmed by studies carried out using a hydrodynamic jet cavitator. On the basis of UV-spectroscopic studies, regularities of cavitation oxidation of benzene with hypochlorite waste waters were revealed. On the basis of the analysis of the dependence of the potential of carbon steel corrosion on the time of exposure in the environment, corrosion aggressiveness of the investigated aqueous media is established in relation to the material existing on the equipment and communications production. The approbation of the developed energy-saving cavitation technology for the treatment of wastewater from the aromatic compound has been carried out. The technological principles of the process of cavitational wastewater treatment of aromatic compounds are formulated, in particular, the technological parameters of this process are determined. The generalized energy and techno-economic calculations of energy-saving cavitation technology of wastewater treatment from aromatic compounds have been fulfilled. Key words: cavitation, wastewater treatment, destruction, aromatic compounds, sonochemical analysis, aqueous media.