DOI 10.35776/VST.2021.06.05
УДК 628.16.081.32
Ahmed Sameh Abdelfattah Araby, Gogina Elena
Phenol adsorption on industrial activated carbon: evaluation of efficiency
Summary
The adsorption of phenol on activated carbon is considered one of the most efficient wastewater treatment systems. In this regard, the effectiveness of two Russian manufactured industrial activated carbon types in removing phenol from wastewater has been studied. The samples included powdered activated carbon (made from birch charcoal) and crushed activated carbon (made from coconut shells). The study was carried out under the conditions of pH variation and the effect of contact time and different initial concentrations of phenol on the adsorption process. The study was further expanded to clarify the adsorption kinetics and the Langmuir and Freundlich isotherm model. The results showed that activated carbon retained the maximum adsorption capacity over a wide pH range of 2 to 9. This fact proves the usability of coal for removing phenol from various wastewater types. The adsorption mechanism using both activated carbon samples followed the pseudo-second order and corresponded to the Langmuir isotherm model. The maximum adsorption capacity was 185.19 and 172.41 mg/g for powdered and crushed coal, respectively, suggesting a high efficiency of phenol removal from wastewater.
Key words
wastewater , phenols , adsorption , activated carbon , adsorption kinetics and isotherms
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UDC 628.316.12
Rublevskaya O. N., PANKOVA G. A., Leonov L. V., Kolosov D. E.
Approbation of Glint artificial aluminosilicate sorbent for tertiary treatment of biologically treated domestic wastewater
Summary
The results of pilot tests of synthetic aluminosilicate sorbent under Glint trademark in comparison with AG-3 granulated activated carbon are presented. The study was carried out with effluent from the North Wastewater Treatment Plant of SUE «Vodokanal of St. Petersburg». The following parameters were determined in the effluent samples: рН, suspended solids concentration, phosphate as P, anionic surfactants, ions of iron, zinc, aluminium, nickel, copper and manganese. Glint sorbent is aluminosilicate granular material with effective surface and contains exchangeable ions of calcium and magnesium. Glint material proved itself in the treatment of industrial wastewater contaminated with heavy metal ions but not contaminated with organics and complexing compounds.
Key words
filtration , wastewater , aftertreatment , heavy metals , activated carbon , aluminosilicate sorbent
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UDC 628.35
Stepanov S. V., Stepanov A. S., Gabidullina L. A., Dubov O. V.
Biological treatment of oil refinery wastewater in a biosorption membrane reactor
Summary
The basic process and kinetic regularities of biomembrane and biosorption membrane treatment of fuel and lube refinery wastewater are presented. The enhancement of denitrification process is suggested by reducing the dissolved oxygen concentration in the circulating flow of activated sludge by vacuum treatment. Summarizing the results of operating a pilot vacuumizing unit the more efficient use of biosorption membrane technology compared to the biomembrane method is shown. Single dosing of 1 g of powdered activated carbon per 1 liter of mixed liquor provided for reducing the mean monthly concentration of pollutants in permeate: in COD – from 68 to 49 mg/l; in BODfull – from 6 to 3.5 mg/l; in oil products – from 0.65 to 0.21 mg/l. The kinetic constants of the processes of eliminating the basic pollutants in membrane and biosorption membrane reactors were determined. It was stated that the specific oxidation rate in biosorption membrane reactors exceeded the similar indicators of membrane bioreactors only for easily sorbed substances – oil products and organic pollutants evaluated in BODfull. Vacuum treatment of circulating activated sludge during 5 minutes at minus 90 kPa pressure in a membrane bioreactor provided for 2-fold reduction of the dissolved oxygen concentration, improvement of the sedimentation properties of activated sludge (compared to the flow scheme without vacuum treatment) and the dissolved oxygen concentration less than 0.5 mg/l in the anoxic zone of the membrane bioreactor.
Key words
wastewater , nitrification , activated sludge , membrane bioreactor , denitrification , oil refinery , kinetic constant , activated carbon , biosorption membrane reactor
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DOI 10.35776/VST.2022.09.07
UDC 628.16.081.32
Ahmed Sameh Abdelfattah Araby, Gogina Elena
Study of the competitive adsorption of a mixture of phenol and ammonia nitrogen on activated carbon
Summary
Phenol and ammonia nitrogen are considered typical pollutants present in industrial wastewater from various industries. Application of the response surface methodology (RSM) was used to develop a mathematical model for the simultaneous adsorption of phenol and ammonia nitrogen on activated carbon. The combined effect of pH, carbon doses, the initial concentration of phenol, and the initial concentration of ammonia nitrogen on the efficiency of adsorption was studied. Simulation using RSM gave a nontransformed quadratic model for phenol removal and a square root transformed linear model for ammonia nitrogen removal. The results of the study showed a positive effect of increasing the carbon dose on the adsorption of phenol, while an increase in the initial concentration of phenol had a negative effect on the efficiency of its adsorption. Almost complete removal of phenol was achieved within 90 minutes at pH4. In addition, the adsorption of ammonia nitrogen improved with increasing pH and carbon dose. The presence of ammonia nitrogen adversely affected the removal of phenol with pH increasing. However, the presence of phenol does not affect the adsorption of ammonia nitrogen.
Key words
wastewater , simulation , phenols , adsorption , ammonia nitrogen , activated carbon
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UDC 628.168
Bobinkin V. V., Ershov A. G., Kasatochkin A. S., Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Semin M. M., Shilov Mikhail
Commercial plant for removing chloroorganic compounds from underground water
Summary
The existing technology of removing chloroorganic compounds from underground water allowed designing a relatively simple and reliable flow scheme. Within the shortest possible time a commercial plant with a capacity of up to 250 m3/h (4000 m3/day) of water cleaned off volatile chloroorganic compounds at the «Zalineinyi» water intake in Podolsk city, Moscow Area, was designed. This allowed commissioning temporally abandoned water wells and improving the municipal water supply. At the first stage of reconstruction the process flow scheme of water treatment was upgraded with a system of enhanced aeration-air stripping of volatile chloroorganic compounds, a first lift pumping station, a mechanical filters block charged with granulated activated carbon. After purification the concentration of volatile chloroorganic compounds in water was lower then the regulatory requirements. The second reconstruction stage envisages commissioning a reverse osmosis plant to eliminate water hardness to the optimal level.
Key words
potable water , ground water , water treatment , activated carbon , volatile chlororganic compounds , aeration-air stripping
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UDC 628.161:661.183.2
Khotchenkov V. P, Strikhar Yu. V., Stolyarova E. A., Zaitchik B. Ts., Rouzhitsky A. O.
Comparing the terminology and methods of activated carbon analyses according to the standards – GOST (State Standard) and ASTM, TM, AWWA
Summary
The comparison of international and Russian methods of activated carbon analyses is presented. The comparison of the terms used was made on the basis of the standards – GOST, ASTM, AWWA, EN and standards adopted by certain activated carbon manufacturers. It is shown that the methods of activated carbon evaluation according to the international standards ensure more definite results, and provide for overall estimation of activated carbon application properties. The attention is draw to the fact that while considering similar parameters with the use of domestic and international standards there is certain difference between testing methods which makes the comparison of the results problematic.
Key words
activated carbon , criterion of quality estimation , method of analysis , harmonization of standards
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