THE STUDY OF TREATMENT OF WATER WITH A HIGH CONCENTRATION OF COD BY PULSE DIELECTRIC BARRIER DISCHARGE ON THE SURFACE OF THE LIQUID
DOI:
https://doi.org/10.15407/geotech2020.32.065Keywords:
plasma, dielectric barrier discharge, water, ozone, hydroxyl radical, dinitrotoluene, meth-ylene, surfactants, energy efficiency.Abstract
Progressive water pollution due to anthropogenic impact on the environment is one of the current problems. One of the main types of wastewater pollutants is organic matter. A relatively simple and cheap method of purifying water from them is its biological treatment with aerobic bacteria. However, there are many highly toxic organic impurities, for the decomposition of which this method is in any case in its aerobic guise is unsuitable, and anaerobic processes require too much time and temperature control of processing processes and also become questionable given the required energy costs. Such complex substances, from the point of view of their biological treatment, include organic dyes, which according to world statistics make up 15% of all harmful substances that must be neutralized before entering the aquatic ecosystem. For such waters, their pre-treatment becomes relevant, which will reduce the load on biological treatment plants by oxidation of toxic substances and a general reduction of the organic component, ie reduction of dichromate chemical oxygen demand (HSC). Water treatment with such contaminants can be carried out using technologies that use advanced oxidation processes (AOP). In our work we studied the efficiency of plasma oxidation of wastewater barrier discharge of dye manufacturers, the main component of which is technical 2,4-dinitrotoluene, as well as models of the organic component of NPP wastewater, the main component of which is a phosphate-based detergent containing South Africa - 26.8%. Water films with a thickness of ~ 0.1 mm were treated at a rate of growth of discharge voltage pulses ≈3 • 1011V / s. The energy efficiency of the pulsed barrier discharge at different modes of water treatment with different impurities of organic substances has been studied. To obtain high energy efficiency, water treatment should be carried out at such parameters of the pulse barrier discharge (energy and pulse repetition frequency) and air velocity, so that the specific energy input to the air passing through the chamber does not exceed ~ 100 / l. The highest energy yield of the pulsed barrier discharge, for wastewater samples, at specific energy inputs does not exceed ≈10J / ml.
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