The Leaching Behavior of Zinc Oxide in Medical Waste of Dental Clinics
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Abstract
Zinc Oxide is an indispensable substance in the field of dental treatment. It is used daily and intensively in all governmental and private dental clinics, leading to the disposal of very high concentrations of zinc with waste and eventually in landfill sites as a final destination for solid waste removal. This indicates the urgent need to investigate its behavior upon disposal due to the surrounding conditions. Approximately 4195 g of mixed dental waste samples were collected from (17) healthcare centers in Baghdad Al-Karkh. The leaching behavior of ZnO powder was investigated through batch reactors using makeup dental solid waste samples. The ZnO leaching was tested with 3 conditions; acidic, alkaline, and Ionic Strength (IS). The acidic condition was considered the most hazardous condition compared with basic and salinity due to the increasing tendency of ZnO to release Zn ion within waste leachate. In solutions with low pH, the dissolution of ZnO tends to produce zinc ions due to the attack of the ZnO surface by proton. In solutions of pH more than 9, the degradation of zinc oxide produces hydroxide complexes. Increasing (IS) decreased zinc concentration in leachate samples with time by promoting solids aggregation, decreasing the repulsive forces of ZnO particles, and accumulating in the bottom of reactors.
Article received: 07/12/2022
Article accepted: 29/04/2023
Article published: 01/05/2023
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Alameen, M., and Majeed, N., 2020. Removal of cadmium from industrial wastewater using electrocoagulation process. Journal of Engineering, 26(1), 24-34. doi:10.31026/j.eng.2020.01.03
AL-Saedi, Z., and Ibrahim, J. A. K ., 2019. Evaluation of Heavy Metals Content in Simulated Solid Waste Food Compost. Journal of Engineering, 25(9), 62-75. doi:10.31026/j.eng.2019.09.6
Altin, S., Altin, A., Elevli, B. and Cerit, O. R. H. A. N ., 2000. Determination of hospital waste composition and disposal methods: a case study. Polish Journal of Environmental Studies, 12(2), 251-255.
Basel Convention, 2017. Healthcare or medical waste fact sheet. secretariat of the Basel, Rotterdam and Stockholm Conventions, Conference of the Parties in its decision BC-13/2 in 2017.
Bian, S. W., Mudunkotuwa, I. A., Rupasinghe, T., and Grassian, V. H ., 2011. Aggregation and dissolution of 4 nm ZnO nanoparticles in aqueous environments: influence of pH, ionic strength, size, and adsorption of humic acid. Langmuir, 27(10), 6059-6068. doi:10.1021/la200570n
Bolyard, S. C ., 2012. Fate of coated Zinc Oxide in municipal solid waste landfills. MSc. Thesis, Department of Civil, Environmental, and Construction Engineering, College of Engineering and Computer Science, University of Central Florida Orlando, USA.
Ebrahim, S.E., and Alhares, H.S., 2015. Competitive removal of Cu2+, Cd2+ and Ni2+ by iron oxide nanoparticle (Fe3O4). Journal of Engineering, 21(4), 98-122. doi:10.31026/j.eng.2015.04.06
Haynes, W. M., Lide, D. R. and Bruno, T. J ., 2016. CRC handbook of chemistry and physics. 97th Edition. CRC press.
Jabbar, M.F.A., 2020. Preparation of nano Zinc oxide and its application in the photocatalytic degradation of Ampicillin. Journal of Engineering, 26(11), 133-149. doi:10.31026/j.eng.2020.11.09
Moradpoor, H., Safaei, M., Mozaffari, H.R., Sharifi, R., Imani, M.M., Golshah, A., and Bashardoust, N., 2021. An overview of recent progress in dental applications of zinc oxide nanoparticles. RSC Advances, 11(34), pp. 21189-21206. doi:10.1039/D0RA10789A
Poynton, H.C., Chen, C., Alexander, S.L., Major, K.M., Blalock, B.J., and Unrine, J.M., 2019. Enhanced toxicity of environmentally transformed ZnO nanoparticles relative to Zn ions in the epibenthic amphipod Hyalella azteca. Environmental Science: Nano, 6(1), 325-340. doi:10.1039/C8EN00755A
Ryan, J., Estefan, G., and Rashid, A., 2001. Soil and plant analysis laboratory manual. ICARDA (International Center for Agricultural Research in the Dry Areas) & NARC (National Center for Agricultural Research.
Sakallioglu, T., Bakirdoven, M., Temizel, I., Demirel, B., Copty, N. K., Onay, T. and Karanfil, T ., 2016. Leaching of nano-ZnO in municipal solid waste. Journal of hazardous materials, 317, 319-326. doi:10.1016/j.jhazmat.2016.05.094
Tchobanoglous, G and Kreith, F ., 2002. Handbook of solid waste management. McGraw-Hill Education, New York.
Townsend, T., Jang, Y. C and Tolaymat, T ., 2000. A guide to the use of leaching tests in solid waste management decision making (pp. 03-01). The University of Florida, The Florida Center for Solid and Hazardous Waste Management.
Vimercati, L., Cavone, D., Caputi, A., De Maria, L., Tria, M., Prato, E., and Ferri, G.M ., 2020. Nanoparticles: An experimental study of zinc nanoparticles toxicity on marine crustaceans. General overview on the health implications in humans. Frontiers in Public Health, 8, 192. doi:10.3389/fpubh.2020.00192
Wang, X., Sun, T., Zhu, H., Han, T., Wang, J., and Dai, H., 2020. Roles of pH, cation valence, and ionic strength in the stability and aggregation behavior of zinc oxide nanoparticles. Journal of Environmental Management, 267, 110656. doi:10.1016/j.jenvman.2020.110656