Phenol is a major pollutant in the waste waters coming from coal processing. Hydrodynamic cavitation presents a novel technology for phenol removal from waste waters. Hydrodynamic cavitation device with a cavitator of Ventury type for waste water purification was constructed. The hydraulic characteristic of the device were determined: the dependences of flow and cavitation number on inlet pressure. The effects of cavitation number, phenol concentration, pH, temperature, time, and quantity of added H 0 on the degree of phenol reduction in the waste water was investigated. The optimal 2 2 technological parameters of the investigated cavitation purification process of waste waters from phenol were determined.
Polychlorinated biphenyls are of great importance in the production of plastics, synthetic solvents, pesticides and synthetic transformer oils, in the production of insulating materials, paints, varnishes, lubricants, adhesives, hydraulic oil oils, printing colors, working fluids for heat transfer and other . Transformer oils are non-degradable and belong to extremely hazardous environmental pollutants and are classified into group 2A chemicals with probably carcinogenic effects per person. By penetrating the soil permanently pollute the soil and groundwater. By burning them outdoors, a large number of toxic carcinogens are released. It is permitted to use transformers operating in normal operating mode without disturbance and leakage of oil and contain pyralene or polychlorinated biphenyls between 50 and 500 ppm, but their decontamination is required by 2025. Therefore, the obligation was imposed on appropriate procedures to destroy or dehlorinate the transformer oils with dielectric fluids (pyralene, polychlorinated biphenyls). The decontamination product should be a transformer oil with a concentration of dielectric fluid below 50 ppm. The aim of the work is to apply the appropriate degradation technology, ie, decontamination of pyralene or polychlorinated biphenyls. The results of decontamination of transformer oil of PCB at concentrations of about 500 ppm, using base catalyzed destruction, contain all the elements of the best available technology and the best ecological practices of pyralene desertification. The decomposition of pyralene is a dependable process from the concentration of the applied neogene base. In order to purify the treated transformer oil, adsorbents are used: zeolite and activated carbon.
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