An analysis of electrochemical degradation of organic compounds, in particular EDTA is presented. The influence of the nature of the anode and the nature of the oxidizing agent on the degradation of organic compounds is showed. Anode materials are classified based on their oxidizing power in an acidic environment. It is shown that direct oxidation of EDTA effectively occurs on the anodes Ti/PbO2 and Ti/SnO2. In the presence of NaCl EDTA is effectively oxidized on the anodes Ti/RuO2-TiO2 by the formation of hypochlorite. Examples of destruction of EDTA under the influence of ultraviolet radiation are given. Degradation products (nitro acetic acid, amino diacetic acid) form CO2, H2O, NO3-ions at full decomposition. It is noted that the neutralization of wastewater containing copper and EDTA is carried out in two stages: destruction of EDTA and the extraction of copper hydroxide. The extraction of copper ions from the system H2O-Cu2+-EDTA-electrolyte with different ratios of metal-ligand is investigated. The effect of EDTA concentration on the flotation process for extracting copper hydroxide is analyzed. The kinetics of flotation of copper extraction in the presence of two complexing agents - NH3 and EDTA is considered. The presented results allow to assess the degree of extraction of copper from solution copper-EDTA at different coal sorbents and resins. It is shown that the use of anion exchange resin Purolite A500 and anion exchange resin AB-17-8 is effective when the copper concentration is 25 mg/l. It is established that the sorption process is slow: stationary values are set for several hours. The degree of extraction of EDTA reaches 30-40%. When the ratio of copper-EDTA 1:1.0-1.5 it is possible to reach flotation copper extraction up to 80%. Under additional sorption treatment the extraction degree reaches to 99%. It is shown that the use of highly dispersed carbon materials (coal powders) allows extracting ligands from wastewater, increasing the efficiency of copper hydroxides electroflotation.
Presents an analysis of electrochemical degradation of organic compounds, in particular EDTA. Shows the influence of the nature of the anode and the nature of the oxidizing agent on the degradation of organic compounds. Anode materials are classified based on their oxidizing power in an acidic environment. It is noted that the neutralization of wastewater containing copper and EDTA is carried out in two stages: destruction of EDTA and the extraction of copper hydroxide. Investigated the extraction of copper ions from the system H2O-Cu2+-EDTA-electrolyte with different ratios of metal-ligand. The effect of EDTA concentration on the flotation process for extracting copper hydroxide, considers the kinetics of flotation of copper extraction in the presence of two complexing agents - NH3 and EDTA. The presented results allow to assess the degree of extraction of copper from solution copper-EDTA at different coal sorbents and resins. The degree of extraction of EDTA reaches 30-40%. When the ratio of copper-EDTA 1:1.0-1.5 is possible flotation copper recovery of 80%, an additional sorption treatment of up to 99%.
Представлен анализ электрофлотационного извлечения смеси ионов меди и цинка из растворов, приготовленных смешением исходных растворов сульфата меди и гидроксида аммония. Показано, что извлечение ионов меди из аммиакатных систем протекает недостаточно эффективно в широком диапазоне pH. Установлено, что при увеличении концентрации аммония, в несколько раз превышающей содержание меди, остаточная концентрация меди после электрофлотации увеличивается до 5 -10 мг/л. Отмечено отрицательное влияние аммиачной среды на скорость электрофлотационного процесса и степень очистки. Показано влияние лиганда NH3 на снижение размера частицы в 8 -10 раз по сравнению с раствором Na2SO4. Установлено, что введение в систему с комплексообразователем (Cu, Zn) катионного ПАВ приводит к смещению ξ-потенциала в положительную сторону. При 10-кратном избытке лиганда по отношению к комплексообразователям катионов Cu, Zn степень электрофлотационного извлечения смеси труднорастворимых соединений меди и цинка снижается. Введение катионного флокулянта Zetag-8160 существенно интенсифицирует процесс электрофлотации (в 2 -3 раза). Показано положительное влияние на процесс фильтрационного извлечения смеси труднорастворимых соединений меди и цинка присутствие в системе катионного ПАВ и флокулянта. Установлено, что в присутствии в системе 10-кратного избытка лиганда (NH3), процесс электрофлотационного извлечения дисперсной фазы гидроксидов меди и цинка протекает наиболее эффективно с катионным флокулянтомZetag-8160, достигая высоких степеней извлечения.
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