DOI 10.35776/VST.2021.01.01
UDC 628.167.069.84
Tcherkesov A. Yu., Shchukin S. A., Denisova Irina
Study of the catalytic iron oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator
Summary
The results of studies of the catalytic iron oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator are presented. The studies were carried out in a laboratory setup. An artificially prepared model hydrogen sulfide-containing water served as the object of study. The laboratory setup was a reactor vessel where hydrogen sulfide was oxidized by air oxygen in the presence of iron hydroxide that acted as a catalyst for the process. The separation of purified water and Fe (OH)3 was carried out by ultrafiltration. All the experiments were executed under the conditions recommended for the iron catalytic oxidation of hydrogen sulfide: concentration of iron (III) hydroxide 2 g/dm3, pH 7–8, residence time in the reactor 1 hour, air consumption 2 m3/m3, temperature 20–23 ºС. The oxidizing ability of the method has been experimentally confirmed at the above standard values of the indicators. A regression equation has been obtained that describes the catalytic oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator. The presented method can be recommended in the process flow schemes of natural hydrogen sulfide-containing water purification for the purposes of drinking water supply.
Key words
ultrafiltration , sulfide-alkaline wastewater , hydrogen sulfide , membrane separation , air oxygen , iron hydroxide
|
DOI 10.35776/VST.2021.07.04
UDC 628.32:66.081.63
Il’ina Marina, Kurichkin Ivan
Optimization of the process of membrane separation of MSW landfill leachate with a high concentration of hardness saltsOptimization of the process of membrane separation of MSW landfill leachate with a high concentration of hardness salts
Summary
The aspects of optimizing the process of reverse osmosis membrane separation of the leachate of a municipal solid waste landfill with a high concentration of hardness salts is considered. The research was carried out in an experimental two-stage reverse osmosis unit. To study possible increasing the efficiency of the membrane reverse osmosis separation of the leachate and, in particular, of the membrane flux, various inhibitors of sediment formation were added to the feed clarified percolating water (before the membrane separation): Avista Vitec 3000, Clarofos 381, and sodium tripolyphosphate. Percolating water of the Mar’inskii solid waste landfill (Vladimir region) with a high concentration of hardness salts was used as a researchable aqueous solution. Based on the results of the executed studies, the effect of various inhibitors of sediment formation on the process of membrane reverse osmosis separation was estimated in terms of the membrane flux. The positive effect on membrane separation of the inhibitors of the sediment formation of hardness salts on the membrane surface added into the feed clarified leachate of the solid waste landfill has been proven. The best results in increasing the membrane flux during the purification of clarified percolating water were obtained with the use of the Avista Vitec 3000 inhibitor. The executed studies have shown that while choosing a sediment formation inhibitor, the specific composition of the feed water, the operating mode of the membrane equipment and the special requirements of the purification technology should be taken into account.
Key words
high concentrated wastewater , membrane separation , scaling inhibitors , two-stage reverse osmosis unit , hardness salts , membrane flux , concentration grade
|
bbk 000000
УДК 628.16.094.3:66.074.371
FESENKO L. N., Tcherkesov A. Yu., Ignatenko S. I., Shchukin S. A.
Purification of hydrogen sulfide containing natural water
by iron-catalytic oxidation in a reactor with unltrafiltration separation
Summary
Currently purification of hydrogen sulfide containing water has been still a bottleneck in water treatment and demands advanced high-efficient technologies, equipment and plants providing for solving at the same time drinking and environmental aspects. The technology based on iron-catalytic oxidation of sulfides in the presence of atmospheric oxygen and combined with membrane treatment is proposed as an advanced technology of hydrogen sulfide removal from natural water. The data on practical testing the proposed technology in a laboratory unit is presented. Subsequent to the results of the experimental studies the area of the developed technology application in purification of hydrogen sulfide containing natural water is substantiated. The absence of accompanying hydrogen sulfide emission from the reactor in the process of water purification and environmental safety has been noted. Based on the obtained results the technology is considered for today as possible and essential. Herewith further study with investigations directed at determining the optimal process parameters is needed.
Key words
natural water , water treatment , hydrogen sulfide , iron-catalytic oxidation of sulfides , membrane separation
|
UDC 628.161:66.081.63
DOI 10.35776/VST.2023.12.03
Tsabilev O. V., Uglov Sergei, Vasil’chenko Vladimir, Kopytin Iurii
Pilot tests of VSEP technology to minimize the amount
of reverse osmosis concentrate
Summary
The results of pilot tests of the VSEP vibromembrane liquid separation technology for concentrating wastewater with high salinity from an industrial reverse osmosis plant are presented. VSEP technology provides for achieving high filtrate yields from salty wastewater eliminating pre-treatment and the use of antiscalants. As a result of membrane separation, demineralized water (filtrate) is obtained, that can be reused in the production cycle, as well as a highly concentrated solution of salts (concentrate), that also includes insoluble sludge. The tests were carried out at an industrial facility using a pilot plant of the VSEP Auto-LP series using reverse osmosis membranes. Procedures for choosing the brand of a polymer membrane and determining the optimal operating pressure were carried out. The experimental data on wastewater concentration cycles are presented to determine the conditions for the stability of the separation process and the duration of the installation flushing interval. The test results provide for designing an industrial wastewater return system for reuse.
Key words
reverse osmosis , pilot tests , membrane separation , VSEP technology , concentration polarization , reverse osmosis membrane
|
|
