حذف کروم شش ظرفیتی از محیطهای آبی با استفاده از فرآیند الکتروکوآگولاسیون

Document Type : Original Research

Author
abbas rezaee
دانشیار دانشگاه تربیت مدرس
Abstract
The purpose of this study was to investigate the effect of thioglycolic acid on the coagulation process used in the removal of hexavalent chromium. Experiments were conducted in a 250-ml batch reactor. Steel electrodes with monoplore arrangement were used as anode and cathode (× 1 × 4 × 5 × 5 cm) for electrical coagulation. The effect of effective operating indicators such as pH (3-9), concentrations of tioglycolic acid (0.0.03-0.1 ml), inductive flow rate (25- 200 mA), initial concentrations of chromium 25 mg / L) and the amount of supporting electrolyte (25-25 mg / L) were evaluated. No significant difference was found between the removal efficiency of chromium at different pH values by addition of thioglycolic acid, and in all cases, the removal efficiency was 100%. However, the initial pH 3 was chosen as optimal pH due to the final pH 7 after the reaction and no need to neutralize. With increasing concentration of thioglycolic acid, the removal efficiency of chromium increased by 30 minutes. In the concentration of 0.05 tioglycolic acid, less sludge was produced. The use of 200 mA current intensity showed the highest removal efficiency of chromium. By reducing the density of the flow, we have a decrease in the removal efficiency. Based on the results obtained from this study, it can be concluded that the use of Tioglucic Acid in the coagulation process can have a significant effect on the removal of hexavalent chromium

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Coradduzza D, Congiargiu A, Azara E, 2024, Heavy metals in biological samples of cancer patients: a systematic literature review. Biometals 37, pp: 803–817. 10.1007/s10534-024-00583-4
Daneshvar N, Khataee A, Ghadim AA, Rasoulifard M, (2007, Decolorization of CI Acid Yellow 23 solution by electrocoagulation process: Investigation of operational parameters and evaluation of specific electrical energy consumption (SEEC), J Hazard Mater, 148, pp:566-72, 10.1016/j.jhazmat.2007.03.028
Dermentzis K., Christoforidis A., Valsamidou E., Lazaridou A., Kokkinos N., 2011, Removal of hexavalent chromium from electroplating wastewater by electrocoagulation with iron electrodes. Global Nest J, 13, pp:412-8,
Gabisa EW, Ratanatamskul C, 2024, Effects of operating conditions on removal of microplastics (PET, PP, PS) from wastewater by electrocoagulation systems and kinetics of chromium removal in the presence of microplastics, J Water Process Eng, 61, pp: 105313, 10.1016/j.jwpe.2024.105313
Gao P, Chen X, Shen F, Chen G, 2005, Removal of chromium (VI) from wastewater by combined electrocoagulation–electroflotation without a filter. Sep. Purif. Technol, 43, pp:117-23. 10.1016/j.seppur.2004.10.008
Hojabri S, Rajic L, Zhao Y, Alshawabkeh AN, 2024, Simulation of hexavalent chromium removal by electrocoagulation using iron anode in flow-through reactor, J Hazard Mater, 476, pp:135195, 10.1016/j.jhazmat.2024.135195
Hossini H, Shafie B, Niri AD,2022, A comprehensive review on human health effects of chromium: insights on induced toxicity. Environ Sci Pollut Res 29, pp: 70686–70705. https://doi.org/10.1007/s11356-022-22705-6
Kerur SS, Bandekar S, Ratnamala, GM, Hegde PG, 2021, Removal of hexavalent Chromium-Industry treated water and Wastewater: A review, Mater Today 42, pp:1112-1121, 10.1016/j.matpr.2020.12.492.
Khandegar V, Saroha AK, 2013, Electrocoagulation for the treatment of textile industry effluent–A reviw, J Environ Manag, 128, pp:949-63, 10.1016/j.jenvman.2013.06.043
Kobya M, Can OT, Bayramoglu M, 2003, Treatment of textile wastewaters by electrocoagulation using iron and aluminum electrodes. J Hazard Mater, 100, pp:163-78, 10.1016/S0304-3894(03)00102-X
Lakshmipathiraj P, Raju GB, Basariya MR, Parvathy S, Prabhakar S (2008) Removal of Cr (VI) by electrochemical reduction. Sep Purif Technol 60,pp:96-102, 10.1016/j.seppur.2007.07.053
Liu C, Yu X, Ma C, Guo Y, Deng T, 2021, Selective recovery of strontium from oilfield water by ion-imprinted alginate microspheres modified with thioglycollic acid, Chem Eng J, 410, pp: 128267, 10.1016/j.cej.2020.128267
Mouedhen G, Feki M, De Petris-Wery M, Ayedi HF, 2009, Electrochemical removal of Cr(VI) from aqueous media using iron and aluminum as electrode materials: Towards a better understanding of the involved phenomena, J Hazard Mater 168, pp: 983-991. 10.1016/j.jhazmat.2009.02.117.
Muñoz M, Aller A, Littlejohn D, 2014, The bonding of heavy metals on nitric acid-etched coal fly ashes functionalized with 2-mercaptoethanol or thioglycolic acid. Mater Chem Physics, 143, pp:1469-80, 10.1016/j.matchemphys.2013.12.002
Parida L, Patel TN, 2023, Systemic impact of heavy metals and their role in cancer development: a review. Environ Monit Assess 195, pp:766-779. 10.1007/s10661-023-11399-z
Pradhan D., Beharisukla L., Sawyer M., Rahman K.S.M, 2017, Recent bioreduction of hexavalent chromium in wastewater treatment: A review. J Ind Eng Chem 55, pp: 1-20. https://doi.org/10.1016/j.jiec.2017.06.040
Schlautman MA, Han I, 2001, Effects of pH and dissolved oxygen on the reduction of hexavalent chromium by dissolved ferrous iron in poorly buffered aqueous systems. Water Res, 35, pp:1534-46, 10.1016/S0043-1354(00)00408-5
Soliman EM, Mahmoud ME, Ahmed SA, 2002, Reactivity of thioglycolic acid physically and chemically bound to silica gel as new selective solid phase extractors for removal of heavy metal ions from natural water samples. Int J Environ Anal Chem, 82, pp:403-13, 10.1080/03067310290007831
Un UT, Onpeker U.S., Ozel E, 2017, The treatment of chromium containing wastewater using electrocoagulation and the production of ceramic pigments from the resulting sludge. J Environ Manag 200, pp:196-203. https://doi.org/10.1016/j.jenvman.2017.05.075
Zaroual Z, Chaair H, Essadki A, El Ass K, Azzi M, 2009, Optimizing the removal of trivalent chromium by electrocoagulation using experimental design. Chem Eng J, 148, pp:488-95, https://doi.org/10.1016/j.cej.2008.09.040
Zewail T, Yousef N, 2014, Chromium ions (Cr 6+ & Cr 3+) removal from synthetic wastewater by electrocoagulation using vertical expanded Fe anode. J Electroanalytical Chem, 735, pp:123-8, 10.1016/j.jelechem.2014.09.002