Investigation of the mechanism of microplasma impact on iron and aluminum load using solutions of organic substances

The paper reports on the study of mechanism of electroeffects on iron and aluminum and pellets with using solutions of organic substances. Methylene blue solution, furacilin and eosin were used. It is observed the reactions of the pulse at the time and after switching off the voltage source. It is shown that there are two developing process in the conditions studied. The first process depends on material of electrodes and pulse parameters. The second process occurs spontaneously and it is determined by the redox reaction and sorption processes. The products of electrode erosion and active particles react in the redox reactions. Active particles are formed in solution by the action of pulsed electric discharge in water. The highest efficiency of the process was demonstrated on an iron pellets

Study of Sorption Properties of Aluminium Oxides and Hydroxides Powders Obtained by Electro-Impulse Methods

Experimental results of physicochemical and sorption properties of material samples obtained by electro-spark dispersion in water and by conductor electric explosion in argon are shown in the paper. Due to comparison of investigated samples sorption activity under static conditions, it was able to determine the most effective samples in the process of extraction of Cu{2+} ions from aqueous solutions

Electropulse treatment of water solution of humic substances in a layer iron granules in process of water treatment

The present work is a part of a continuations study of the physical and chemical processes complex in natural waters containing humic-type organic substances at the influence of pulsed electrical discharges in a layer of iron pellets. The study of humic substances processing in the iron granules layer by means of pulsed electric discharge for the purpose of water purification from organic compounds humic origin from natural water of the northern regions of Russia is relevant for the water treatment technologies. In case of molar humate sodium - iron ions (II) at the ratio 2:3, reduction of solution colour and chemical oxygen demand occur due to the humate sodium ions and iron (II) participation in oxidation-reduction reactions followed by coagulation insoluble compounds formation at a pH of 6.5. In order to achieve this molar ratio and the time of pulsed electric discharge, equal to 10 seconds is experimentally identified. The role of secondary processes that occur after disconnection of the discharge is shown. The time of contact in active erosion products with sodium humate, equal to 1 hour is established. During this time, the value of permanganate oxidation and iron concentration in solution achieves the value of maximum permissible concentrations and further contact time increase does not lead to the controlled parameters change

Destruction of humic substances by pulsed electrical discharge

Currently, the water recourses in the territory of Tomsk region are groundwater which is limited to the high concentration of iron and manganese ions and organic substances. These impurities present in water in different forms such as soluble salts ant the colloid forms. Therefore, the present work is a part of a continuations researcher of the processes in natural waters containing humic substances at the influence of pulsed electrical discharges in a layer of iron pellets. It is shown that the main stage of water purification process of humic substances during treatment by pulsed electric discharge in the layer of iron granules is a difficult process including several stages such as formation of iron oxyhydroxide colloid particles, sorption and coagulation with humic macromolecules substances, growth of particle dispersed phase and precipitation. The reason for the formation and coagulation of the dispersed phase is a different state of charge of the colloid particles (zeta potentials of (Fe (OH)3) is +8 mV, zeta potentials of (Humic substances) is -70 mV. The most intense permanganate oxidation reduction to the maximum permissible concentration occurs at the processing time equal to 10 seconds. The contact time of active erosion products with sodium humate is established and it equals to 1 hour. The value of permanganate oxidation achieves maximum permissible concentration during this time and iron concentration in solution achieves maximum permissible concentration after filtration

Electropulse treating of humic substance aqueous solutions in a layer of iron granules at water purification

The authors have studied the processing of humic substances in a layer of iron pellets with pulsed electric discharge for natural water purification from organic compounds of humic origin in northern regions of Russia, that is relevant for water treatment technologies. The aim of the research is to determine the quantitative characteristics of water purification from humic substances in electric pulse processing in the layer of iron pellets. Methods: photocolorimeter, pH-meter, catalytic oxidation, titrometry. Results. The authors determined the quantitative characteristic of critical micelle concentration in the system sodium humate - iron ions (II), which corresponds to a mole ratio of the components of 2:3. The color of solution and demand of chemical oxygen occur at the specified ratio due to the participation of sodium humate and iron ions (II) in oxidation-reduction reactions with further coagulation and formation of insoluble compounds at pH of 6,5. It is shown that sodium humate increases the efficiency of Fe (II) oxidation in Fe (III). In order to achieve this molar ratio, the action time of pulsed electric discharge was determined experimentally. It is 10 seconds. The paper demonstrates the role of the secondary processes after discharge disconnection. The authors determined the contact time of erosion active products with sodium humate, which is 1 hour. During this time, the values of permanganate oxidation and iron ions concentration in solution achieve the value of maximum permissible concentrations and further increase of the contact time does not result in changing the controlled parameters

Electropulse treating of humic substance aqueous solutions in a layer of iron granules at water purification

The authors have studied the processing of humic substances in a layer of iron pellets with pulsed electric discharge for natural water purification from organic compounds of humic origin in northern regions of Russia, that is relevant for water treatment technologies. The aim of the research is to determine the quantitative characteristics of water purification from humic substances in electric pulse processing in the layer of iron pellets. Methods: photocolorimeter, pH-meter, catalytic oxidation, titrometry. Results. The authors determined the quantitative characteristic of critical micelle concentration in the system sodium humate - iron ions (II), which corresponds to a mole ratio of the components of 2:3. The color of solution and demand of chemical oxygen occur at the specified ratio due to the participation of sodium humate and iron ions (II) in oxidation-reduction reactions with further coagulation and formation of insoluble compounds at pH of 6,5. It is shown that sodium humate increases the efficiency of Fe (II) oxidation in Fe (III). In order to achieve this molar ratio, the action time of pulsed electric discharge was determined experimentally. It is 10 seconds. The paper demonstrates the role of the secondary processes after discharge disconnection. The authors determined the contact time of erosion active products with sodium humate, which is 1 hour. During this time, the values of permanganate oxidation and iron ions concentration in solution achieve the value of maximum permissible concentrations and further increase of the contact time does not result in changing the controlled parameters

Electropulse treating of humic substance aqueous solutions in a layer of iron granules at water purification

Проведено исследование процесса обработки гуминовых веществ в слое железных гранул импульсным электрическим разрядом с целью очистки природных вод от органических соединений гумусового происхождения, что является актуальным для технологий водоподготовки. Цель работы: определить количественные характеристики процесса водоочистки от гуминовых веществ при электроимпульсной обработке в слое железных гранул. Методы исследования: фотоколориметрия, рН-метрия, каталитическое окисление, титрометрия, фотометрия. Результаты. Определена количественная характеристика критической концентрации мицеллообразования в исследуемой системе гумат натрия - ионы железа (II), которая соответствует мольному соотношению компонентов 2:3. При указанном соотношении происходит снижение цветности и химического потребления кислорода раствора за счет участия гумата натрия и ионов железа (II) в окислительно-восстановительных реакциях с последующей коагуляцией и образованием нерастворимых соединений при рН, равном 6,5. Показано, что гумат натрия увеличивает эффективность протекания процесса окисления Fe (II) в Fe (III). Для достижения данного мольного соотношения экспериментально установлено время воздействия импульсного электрического разряда, которое составило 10 с. Экспериментально установленное время обработки является достаточным для достижения мольного соотношения гуминовые вещества - ионы железа, равного 2:3 и дальнейшее увеличение времени обработки можно считать нецелесообразным. Показана роль вторичных процессов, протекающих после отключения разряда. Установлено время контакта активных продуктов эрозии с гуматом натрия, которое составляет 1 ч. В течение этого времени значения перманганатной окисляемости и концентраций ионов железа в растворе достигают предельно допустимых концентраций и дальнейшее увеличение времени контакта не приводит к изменению контролируемых параметров.The authors have studied the processing of humic substances in a layer of iron pellets with pulsed electric discharge for natural water purification from organic compounds of humic origin in northern regions of Russia, that is relevant for water treatment technologies. The aim of the research is to determine the quantitative characteristics of water purification from humic substances in electric pulse processing in the layer of iron pellets. Methods: photocolorimeter, pH-meter, catalytic oxidation, titrometry. Results. The authors determined the quantitative characteristic of critical micelle concentration in the system sodium humate - iron ions (II), which corresponds to a mole ratio of the components of 2:3. The color of solution and demand of chemical oxygen occur at the specified ratio due to the participation of sodium humate and iron ions (II) in oxidation-reduction reactions with further coagulation and formation of insoluble compounds at pH of 6,5. It is shown that sodium humate increases the efficiency of Fe (II) oxidation in Fe (III). In order to achieve this molar ratio, the action time of pulsed electric discharge was determined experimentally. It is 10 seconds. The paper demonstrates the role of the secondary processes after discharge disconnection. The authors determined the contact time of erosion active products with sodium humate, which is 1 hour. During this time, the values of permanganate oxidation and iron ions concentration in solution achieve the value of maximum permissible concentrations and further increase of the contact time does not result in changing the controlled parameters