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Abstract

To improve dye retention, there is a concurrent interest in the development and optimization of an alternative and promising method for the dye recovery in aqueous solutions. In this regard, considerable attention was paid to the polyoxometalates (POMs) assisted ultrafi ltration (POMAUF). The aim of the present study is to eliminate toluidine blue (TB) dye by ultrafi ltration membrane using keggin polyoxometalates (POMs) as complexing agents. In the fi rst step, the keggin polyoxometalates K3[PW12O40]∙6H2O(PW12) and K7[PW) were prepared. Then, the obtained powders were characterized by X-ray diffraction and infrared spectroscopies. Afterwards, the removal of toluidine blue (TB) using polyoxometalates assisted ultrafi ltration (POMAUF) was studied. Factors affecting the retention of dye and permeate fl ux such as transmembrane pressure, operating time, polyoxometalates concentration, ionic strength, surfactant and pH were investigated. All results of both compounds have been presented and discussed. The results reveal that the addition of POMs leads to an increase in dye retention from 11 to 95% for the PW 12 and to 98% for the PW . The results of this work have thus suggested the promising enhancement of ultrafi ltration membrane selectivity for the dye removal using new complexing agents such as POMs in place of polyelectrolytes and surfactants.

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Authors and Affiliations

Malak Kahloul
Jalila Chekir
Amor Hafiane
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Abstract

The partial solution for the growing contamination of the environment is the implementation of new technologies. The most of the currently operated systems for surface and groundwaters treatment as well as for wastewater treatment characterize with complex technological arrangements based on a number of unit operations. In water-wastewater management membrane processes are more often applied, especially those in which the difference of pressure at both membrane sites is used as a driving force. As an example of such application is the use of nanofi ltration for groundwaters treatment at Water Treatment Plant Zawada near Dębica or the treatment of municipal landfi ll leachate and industrial wastewater at Eko Dolina Waste Utilization Plant in Łężyce near Gdynia (reverse osmosis unit capacity of 120 m /d). Municipal wastewater treatment based on membrane technologies has already been implemented at domestic wastewater treatment plant. It is especially profi table, when the load of contaminant present in a wastewater varies within a year. In the case of membrane systems use, this issue can be neglected. As an example of membrane based system may serve WWTP in Rowy n/Ustka started up in 2013 and modernized in 2017. The latest trends and developments of selected suppliers of membrane systems are also presented.

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Authors and Affiliations

Krystyna H. Konieczny
Małgorzata Wszelaka-Rylik
Bartłomiej Macherzyńsk
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Abstract

Polymer mixed-matrix nanocomposite membranes were prepared by a wet-phase inversion method and used in ultrafiltration processes to treat wastewater treatment plant effluent spiked with organic micropollutants. The effects of halloysite (Hal), TiO2, and functionalized single-walled carbon nanotube (SWCNT-COOH) nanofillers on the treatment efficiency, permeability loss, and fouling behavior of polyethersulfone (PES) membranes were investigated and compared with those of a pristine PES membrane. The nanocomposite membranes exhibited lower porosity and stronger negative surface charge because of the added hydrophilic nanofillers. The PES-Hal membrane achieved the optimal balance of permeability and micropollutant removal owing to enhanced pollutant adsorption on the membrane surface and the creation of an easily removable cake layer (i.e., reversible fouling). The PES-SWCNT-COOH membrane demonstrated the highest treatment efficiency, but also the high permeability loss. In contrast, PES-TiO2 exhibited excellent antifouling properties, but poorer treatment capabilities.
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Bibliography

  1. Adeniyi, A., Mbaya, R., Popoola, P., Gomotsegang, F., Ibrahim, I. & Onyango, M. (2020). Predicting the fouling tendency of thin film composite membranes using fractal analysis and membrane autopsy, Alexandria Engineering Journal, 59, 6, pp. 4397-4407. DOI:10.1016/j.aej.2020.07.046
  2. Arif, Z., Sethy, N.K., Mishra, P.K. & Verma, B. (2019). Antifouling behaviour of PVDF/TiO2 composite membrane: a quantitative and qualitative assessment, Iranian Polymer Journal, 19, 28, pp. 301-312. DOI:10.1007/s13726-019-00700-y
  3. Bassyouni, M., Abdel-Aziz, M.H., Zoromba, M.Sh., Abdel-Hamid, S.M.S. & Drioli, E. (2019). A review of polymeric nanocomposite membranes for water purification, Journal of Industrial and Engineering Chemistry, 73, pp. 19-46. DOI:10.1016/j.jiec.2019.01.045
  4. Bodzek, M., Konieczny, K. & Kwiecińska-Mydlak, A. (2021). New generation of semipermeable membranes with carbon nanotubes for water and wastewater treatment: Critical review, Archives of Environmental Protection, 47, 3, pp. 3-27, DOI:10.24425/aep.2021.138460
  5. Bohdziewicz, J., Dudziak, M., Kamińska, G. & Kudlek, E. (2016). Chromatographic determination and toxicological potential evaluation of selected micropollutants in aquatic environment - analytical problems, Desalination and Water Treatment, 57, pp. 1361-1369. DOI:10.1080/19443994.2015.1017325
  6. Bu, F., Gao, B., Yue, Q., Liu, C., Wang, W. & Shen, X. (2019). The Combination of Coagulation and Adsorption for Controlling Ultrafiltration Membrane Fouling in Water Treatment, Water, 11, pp. 1-13. DOI:10.3390/w11010090
  7. Buruga, K., Song, H., Shan, J., Bolan, N., Thimmarajampet Kalathi, J. & Kim, K-H. (2019). A review on functional polymer-clay based nanocomposite membranes for treatment of water, Journal of Hazardous. Materials, 379, pp. 1-27. DOI:10.1016/j.jhazmat.2019.04.067
  8. Dudziak, M. & Burdzik-Niemiec, E. (2017). Ultrafiltration through modified membranes in wastewater treatment containing 17β-estradiol and bisphenol A, Przemysł Chemiczny, 96, pp. 448-452, DOI: 10.15199/62.2017.2.35 (in Polish).
  9. Esfahani, M.R., Aktij, S.A., Dabaghian, Z., Firouzjaei, M.D., Rahimpour, A., Eke, J.; Escobar, I.C., Abolhassani, M., Greenlee, L.F., Esfahani, A.R., Sadmani, A. & Koutahzadeh, N. (2019). Nanocomposite membranes for water separation and purification: Fabrication, modification, and applications, Separation and Purification Technolology, 213, pp. 465-499. DOI:10.1016/j.seppur.2018.12.050
  10. Farjami, M., Vatanpour, V. & Moghadassi, A. (2020). Effect of nanoboehmite/poly(ethylene glycol) on the performance and physiochemical attributes EPVC nano-composite membranes in protein separation, Chemical Engineering Research and Design, 156, pp. 371-383. DOI:10.1016/j.cherd.2020.02.009
  11. Gamoń, F., Tomaszewski, M., Cema, G. & Ziembińska-Buczyńska, A. (2022). Adsorption of oxytetracycline and ciprofloxacin on carbon-based nanomaterials as affected by pH, Archives of Environmental Protection, 48, 2, pp. 34-41. DOI:10.24425/aep.2022.140764
  12. Ghaemi, N., Madaeni, S.S., Alizadeh, A., Rajabi, H. & Daraei, P. (2011). Preparation, characterization and performance of polyethersulfone/organically modified montmorillonite nanocomposite membranes in removal of pesticides, Journal of Membrane Science, 382, pp. 135-147. DOI:10.1016/j.memsci.2011.08.004
  13. Haas, R., Opitz, R. & Grischek, T. (2019). The AquaNES Project: Coupling Riverbank Filtration and Ultrafiltration in Drinking Water Treatment, Water, 11, pp. 1-14. DOI:10.3390/w11010018.
  14. Hao, S., Jia, Z., Wen, J., Li, S., Peng, W., Huang, R. & Xu, X. (2021). Progress in adsorptive membranes for separation – A review, Separation and Purification Technology, 255, 117772. DOI:10.1016/j.seppur.2020.117772.
  15. Inurria, A., Cay-Durgun, P., Rice, D., Zhang, H., Seo, D.-K., Lind, M.L. & Perreault, F. (2019). Polyamide thin-film nanocomposite membranes with graphene oxide nanosheets: Balancing membrane performance and fouling propensity, Desalination, 451, pp. 139-147. DOI:10.1016/j.desal.2018.07.004.
  16. Kamińska, G. (2022). Modification of ultrafiltration membranes with nanoparticles and their application, Wydawnictwo Politechniki Śląskiej, Gliwice 2022. (in Polish)
  17. Kamińska, G. & Bohdziewicz, J. (2018). Separation of selected organic micropollutants on ultrafiltration membrane modified with carbon nanotubes.Ochrona. Środowiska, 40, 4, pp. 37-42. (in Polish)
  18. Kamińska, G., Bohdziewicz, J., Calvo, J.I., Prádanos, P., Palacio, L. & Hernández, A. (2015). Fabrication and characterization of polyethersulfone nanocomposite membranes for the removal of endocrine disrupting micropollutants from wastewater. Mechanisms and performance, Journal of Membrane Science, 493, pp. 66-79. DOI:10.1016/j.memsci.2015.05.047
  19. Kamińska, G., Bohdziewicz, J., Palacio, L., Hernández, A. & Prádanos, P. (2016). Polyacrylonitrile membranes modified with carbon nanotubes: characterization and micropollutants removal analysis, Desalination and Water Treatment, 57, pp. 1344-1353. DOI:10.1080/19443994.2014.1002277
  20. Kamińska, G., Pronk, W. & Traber, J. (2020). Effect of coagulant dose and backflush pressure on NOM membrane fouling in inline coagulation-ultrafiltration, Desalination and Water Treatment, 199, pp. 188-197. DOI:10.5004/dwt.2020.25657.
  21. Leo, C.P.; Chai, W.K.; Mohammad, A.W., Qi, Y., Hoedley, A.F.A. & Chai, S.P. (2011). Phosphorus removal using nanofiltration membranes, Water Science and Technology 64, pp.199-205. DOI:10.2166/wst.2011.598.
  22. Mao, Y., Huang, Q. Meng, B., Zhou, K., Liu, G., Gigliuzza, A., Drioli, E. & Jin, W. (2020). Roughness-enhanced hydrophobic graphene oxide membrane for water desalination via membrane distillation, Journal of Membrane Science, 611, 118364. DOI:10.1016/j.memsci.2020.118364.
  23. Marszałek, A. (2022). Encapsulation of halloysite with sodium alginate and application in the adsorption of copper from rainwater, Archives of Environmental Protection, 48, 1, pp. 75-82. DOI:10.24425/aep.2022.140546.
  24. Maximous, N., Nakhla, G., Wan, W. & Wong, K. (2009). Preparation, characterization and performance of Al2O3/PES membrane for wastewater filtration, Journal of Membrane Science, 341, pp. 67–75. DOI:10.1016/j.memsci.2009.05.040.
  25. Mozia, S.; Grylewicz, A.; Zgrzebnicki, M.; Darowna, D. & Czyżewski, A. (2019). Investigations on the properties and performance of mixed matrix polyethersulfone membranes modified with halloysite nanotubes, Polymers-Basel. 11, 671, pp. 1-18. DOI:10.3390/polym11040671.
  26. Muthumareeswaran, M.R. & Agarwal, G.P. (2014). Feed concentration and pH effect on arsenate and phosphate rejection via polyacrylonitrile ultrafiltration membrane, Journal of Membrane Science, 468, pp. 11-19. DOI:10.1016/j.memsci.2014.05.040.
  27. Nasir, A., Masood, F., Yasin, T. & Hammed, A. (2019). Progress in polymeric nanocomposite membranes for wastewater treatment: Preparation, properties and applications, Journal of Industrial and Engineering Chemistry, 79, pp. 29-40. DOI:10.1016/j.jiec.2019.06.052.
  28. Nguyen, M.N., Trinh, P.B., Butkhardt, C.J. & Schafer, A.I. (2021). Incorporation of single-walled carbon nanotubes in ultrafiltration support structure for the removal of steroid hormone micropollutants, Separation and Purification Technology, 264, 118405. DOI:10.1016/j.seppur.2021.118405.
  29. Niedergall, K., Bach, M., Hirth, T., Tovar, G.E.M. & Schiestel, T. (2014). Removal of micropollutants from water by nanocomposite membrane adsorbers, Separation and Purification Technology, 131, 27, pp. 60-68. DOI:10.1016/j.seppur.2014.04.032.
  30. Rogowska, J., Cieszynska-Semenowicz, M., Ratajczyk, W. & Wolska, L. (2020). Micropollutants in treated wastewater, Ambio, 49(2), pp. 487-503. DOI:10.1007/s13280-019-01219-5
  31. Saki, H., Alemayehu, E., Schomburg, J. & Lennartz, B. (2019). Halloysite nanotubes as adsorptive material for phosphate removal from aqueous solution, Water 11, 2, 203. DOI:10.3390/w11020203.
  32. Shaban, M., AbdAllah, H., Said, L. & Ahmed, A.M. (2019). Water desalination and dyes separation from industrial wastewater by PES/TiO2NTs mixed matrix membranes, Journal of Polymer Research, 26, 181, pp. 1-12. DOI:10.1007/s10965-019-1831-4.
  33. Shakak, M., Rezaee, R., Maleki, A., Jafari, A., Safari, M., Shahmoradi, B., Daraei, H. & Lee, S-M. (2019). Synthesis and characterization of nanocomposite ultrafiltration membrane (PSF/PVP/SiO2) and performance evaluation for the removal of amoxicillin from aqueous solutions, Environmental Technology & Innovation, 17, 100529. DOI:10.1016/j.eti.2019.100529.
  34. Suhalim, N.S., Kasim, N., Mahmoudi, E., Shamsudin, I.J., Mohammad, A.W., Zuki, F.M. & Jamari, N. (2022). Rejection Mechanism of Ionic Solute Removal by Nanofiltration Membranes: An Overview, Nanomaterials, 12, 437. DOI:10.3390/nano12030437.
  35. Vatanpour, V., Mansourpanah, Y., Soroush Mousavi Khadem, S., Zinadini, S., Dizge, N., Reza Ganjali, M., Mirsadeghi, S., Rezapour, M., Reza Saeb, M. & Karimi-Male, H. (2021). Nanostructured polyethersulfone nanocomposite membranes for dual protein and dye separation: Lower antifouling with lanthanum (III) vanadate nanosheets as a novel nanofiller, Polymer Testing, 94, pp. 107040. DOI:10.1016/j.polymertesting.2020.107040.
  36. Vatanpour, V., Madaeni, S.S., Rajabi, L., Zinadini, S. & Derakhshan, A.A. (2012). Boehmite nanoparticles as a new nanofiller for preparation of antifouling mixed matrix membranes, Journal of Membrane Science, 401-402, pp. 132-143. DOI:10.1016/j.memsci.2012.01.040.
  37. Wang, S., Yao, S., Du, K., Yuan, R., Chen, H., Wang, F. & Zhou, B. (2021). The mechanisms of conventional pollutants adsorption by modified granular steel slag, Environmental Engineering Research, 26, 1, 190352. DOI:10.4491/eer.2019.352.
  38. Zhang, J., Nguyen, M.N., Li, Y., Yang, C. & Schafer, A.I. (2020). Steroid hormone micropollutant removal from water with activated carbon fiber-ultrafiltration composite membranes, Journal of Hazardous Materials, 391, 122020. DOI:10.1016/j.jhazmat.2020.122020.
  39. Zhang, X., Wang, D.K., Lopez, D.R.S. & Diniz da Costa, J. (2014). Fabrication of nanostructured TiO2 hollow fiber photocatalytic membrane and application for wastewater treatment, Chemical Engineering Journal, 236, pp. 314-322. DOI:10.1016/j.cej.2013.09.059.
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Authors and Affiliations

Gabriela Kamińska
1
ORCID: ORCID

  1. Institute of Water and Wastewater Engineering, Gliwice, Poland
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Abstract

Linden honey ultrafiltration (15 kDa MWCO ceramic membrane) was performed as honey solution pre-treatment before spray drying. Feed and retentate solutions with the addition of maltodextrin as a carrier were spray dried. Drying yield and physical properties of powders were studied (after drying and after 12 weeks of storage). During ultrafiltration it was possible to remove some amount of sugars responsible for honey low glass transition temperature, while keeping protein compounds. Yet, it did not have a significant impact on the drying performance and improvement of powder physical properties immediately after drying and after storage. However, the possibility to remove sugars from honey solution by ultrafiltration can be an encouragement for further research.

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Authors and Affiliations

Katarzyna Samborska
Alicja Barańska
Daria Bodel
Aleksandra Jedlińska
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Abstract

The paper presents the results of studies on the changes in the PAHs concentration during pre-filtration and ultrafiltration (UF) processes. In the study, biologically treated wastewater (after denitrification and nitrification processes), discharged from the biological treatment plant and used in coke plant, was used. A gas chromatography-mass spectrometry (GC-MS) was used in order to qualify and quantify the PAHs. Sixteen PAHs listed by EPA were determined. The wastewater samples were collected three fold and initially characterized for the concentration of nitrate nitrogen, ammonium nitrogen, COD, TOC and pH. In the first step, wastewater was filtrated on the sand bed. Total concentration of 16 PAHs in the treated wastewater before initial filtration was in the range of 44.8‒53.5 mg/L. During the process the decrease in the concentration of the most studied hydrocarbons was observed. Concentration of PAHs after initial filtration ranged from 21.9 to 38.3 μg/L. After the initial filtration process the wastewater flew to the ultrafiltration module and then was separated on the membrane (type ZW-10). The total concentration of 16 PAHs in the process of ultrafiltration was in the range of 8.9‒19.3 mg/L. The efficiency of removal of PAHs from coke wastewater in the process of ultrafiltration equaled 66.6%. Taking into account the initial filtration, the total degree of removal of PAHs reached 85%. The obtained results indicate the possibility of using the ultrafiltration process with the initial filtration as additional process in the coke wastewater treatment.

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Authors and Affiliations

Marzena Smol
Maria Włodarczyk-Makuła
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Abstract

This paper presents ultrafiltration results of model BSA (bovine serum albumin) and MB (myoglobin) solutions prepared with or without NaCl addition. The protein concentrations in the solutions were equal to 0.05 gdm􀀀3 for MB and 0.5 gdm􀀀3 for BSA. The ultrafiltration tests were performed using a laboratory scale unit equipped with 90 mm ceramic disc membranes with a filtration area of 5:610􀀀3 m2 and cut-off of 50 or 150 kDa. The tests were run under constant process conditions, i.e. a cross flow volume (CFV) of 5 ms􀀀1, transmembrane pressure (TMP) of 0.2 MPa, temperature of 20 ◦C and NaCl concentration of 0 or 10 wt%. The installation worked in a semi-open mode with a continuous permeate discharge and retentate recycle. The performance of the membranes was measured with the permeate volumetric flow rate, JV (m3m􀀀2s􀀀1) while their selectivity was determined by the protein rejection, R. The paper evaluates and discusses the protein rejection mechanisms as well as the influence of the membrane cut-off and sodium chloride concentration in the feed on the flux decline during the ultrafiltration of BSA and MB. Moreover, it provides an analysis of the first fouling phase by applying usual filtration laws.
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Authors and Affiliations

Konrad Ćwirko
Elwira Tomczak
Daniela Szaniawska
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Abstract

Easy-to-handle and effective methods of juice clarification and concentration by membrane technologies are still under exploration. The current article presents results of research on the technological development of an alternative natural sweetener of high biological value and improved organoleptic properties. Sorghum saccharatum stem juice is used in research. It is pre-clarified enzymatically with α-amylase and glucoamylase, clarified by ultrafiltration, and concentrated by the direct contact membrane distillation in various temperature ranges. The study shows the efficacy of membrane methods for improving juice purity, total soluble solids ( TSS), and total sugar (TS) content in the syrup obtained. Clarification depends on membrane characteristics at the beginning of the process, as there are no differences at the end of it. Juice concentration at high-temperature differences allows to accelerate the process by approx. 60% comparing to low-temperature differences. A lower temperature difference ( ΔТ = 20–30°С) in the concentration process results in a longer process and syrup acidisation, whereas a higher temperature difference ( ΔТ = 70°С) affects physicochemical properties of syrup due to local overheating and formation of Maillard reaction products. The juice concentration at ΔТ = 50–60°С allows to obtain high values of total soluble solids without significant degradation of physicochemical and organoleptic properties.
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Authors and Affiliations

Vadym Chibrikov
1 2
ORCID: ORCID
Polina Vakuliuk
2
ORCID: ORCID
Nataliia Hryhorenko
3
Sergiy Gunko
4
ORCID: ORCID
Henryk Sobczuk
5
ORCID: ORCID

  1. Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland
  2. National University of Kyiv-Mohyla Academy, Kyiv, Ukraine
  3. Institute of Bioenergy Crops and Sugar Beet of the NAAS of Ukraine, Kyiv, Ukraine
  4. National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine
  5. Institute of Technology and Life Sciences – National Research Institute, Ave. Hrabska, 3, 05-090, Falenty, Poland
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Abstract

This paper presents an experimental study on chicken egg white solution ultrafiltration, where membrane fouling has been the main point of concern. Separation process has been performed with a 150 kDa tubular ceramic TiO2/Al2O3 membrane. The operating parameters have been set as follows: transmembrane pressure 105–310 kPa, cross-flow velocity 2.73–4.55 m/s, pH 5 and constant temperature of 293 K. Resistance-in-series model has been used to calculate total resistance and its components. The experimental data have been described with four pore blocking models (complete blocking, intermediate blocking, standard blocking and cake filtration). The results obtained show that the dominant fouling mechanism is represented by cake filtration model.

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Authors and Affiliations

Martyna Borysiak
Elżbieta Gabruś
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Abstract

The post-processes coke wastewater treatment was carried out using flat ultrafiltration membranes

with a variable polysulfone concentration in membrane solution (15 wt% - 17% wt.) and variable evaporation

time of the solvent from the polymer film surface (0s, 2s, 5s). The ultrafiltration process was carried out with the

transmembrane pressure of 0.4 MPa and the linear speed of water flow over the surface of the membrane at 2

m / s. For all the membranes transport characteristic of de-ionized water describing the dependence of the volumetric flow on the transmembrane pressure was done. Since none of the ultrafiltration membranes prepared had

provided a sufficiently high degree of pollutants removal from wastewater, it was post-treated by RO method.

The wastewater treated this way can be used as technical water for coke quenching. The calculations based on

the assumptions of the hydraulic model of filtration resistance allowed to predict the efficiency of ultrafiltration membranes used in the process. To that end, for each of the membranes, the following parameters were

determined experimentally: the alterations of effluent stream volume over the time of the low-pressure filtration,

the total hydraulic resistance and the resistance constituents such as „new” membrane resistance, the resistance

generated by polarization layer and the resistance caused by fouling - reversible and irreversible.

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Authors and Affiliations

K. Mielczarek
J. Bohdziewicz
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Abstract

The increasingly stringent requirements for wastewater treatment enforce the adoption of technologies that reduce pol-lution and minimize waste production. By combining the typical activated sludge process with membrane filtration, biolog-ical membrane reactors (MBR) offer great technological potential in this respect. The paper presents the principles and ef-fectiveness of using an MBR at the Głogów Małopolski operation.Physicochemical tests of raw and treated wastewater as well as microscopic analyses with the use of the FISH (fluorescence in situ hybridization) method were carried out. More-over, the level of electric energy consumption during the operation of the wastewater treatment plant and problems related to fouling were also discussed. A wastewater quality analysis confirmed the high efficiency of removing organic impurities (on average 96% in case of BOD5 and 94% in case of COD) and suspension (on average 93%).

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Authors and Affiliations

Magdalena Domańska
Anna Boral
Kamila Hamal
Magdalena Kuśnierz
Janusz Łomotowski
Paulina Płaza-Ożóg
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Abstract

In the study, particle size distribution of the MIEX® resin was presented. Such analyses enable to determinate whether presence of fine resin fraction may be the reason for unfavorable membrane blocking during water purification by the hybrid MIEX®DOC – microfiltration/ultrafiltration systems. Granulometric analysis of resin grains using the laser diffraction particle size analyzer (laser granulometer) was carried out as well as the microscopic analysis with scanning electron microscope. The following samples were analyzed: samples of fresh resin (a fresh resin – not used in water treatment processes) and samples of repeatedly used/regenerated resin that were collected to analysis during mixing and after sedimentation process. Particle size distribution was slightly different for fresh resin and for repeatedly used/regenerated resin. The grains sizes of fresh resin reached approximately 60 μm (d10), 120 μm (d50) and 220 μm (d90). Whereas the sizes of repeatedly used/regenerated resin were about 15 μm (d10), 40 μm (d50) and 115-130 μm (d90). The smallest resin grains sizes were in the range of 0.3-0.45 μm. This ensures that the ultrafiltration membranes retain all resin grains, even the smallest ones. Whereas the microfiltration membranes must be appropriately selected to guarantee full separation of the resin grains and at the same time to exclude a membrane pores blocking.

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Authors and Affiliations

M. Rajca
R.T. Bray
K. Fitobór
K. Gołombek

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