Alteration Kinetics of Cementitious Matrices Containing Ashes from Waste of Moukondo Landfill (Brazzaville, Republic of Congo) in Acid and Neutral Media

Mithé Brice Mabiala Loubilou¹, Kiele Molingo Mbemba^1, and Jean Maurille Ouamba¹

¹Université Marien NGOUABI, Unité de Chimie du Végétal et de la Vie, Faculté des Sciences et Techniques, B.P. 69, Brazzaville, Congo

Cite this paper:
Mithé Brice Mabiala Loubilou, Kiele Molingo Mbemba and Jean Maurille Ouamba. Alteration Kinetics of Cementitious Matrices Containing Ashes from Waste of Moukondo Landfill (Brazzaville, Republic of Congo) in Acid and Neutral Media. American Journal of Environmental Protection. 2023; 11(2):34-40. doi: 10.12691/env-11-2-1

Abstract

Household waste management remains a delicate problem in the Republic of Congo due to the lack of household waste management infrastructure. Several wild landfills arise in outlying districts of the city of Brazzaville. The proliferation of uncontrolled landfills leads to household waste burning which essentially generates two (02) residue-type products: smoke and ashes. The objective of this study is to develop cementitious matrices containing burn ashes, sufficiently efficient to retain in their structure heavy metals contained in these ashes. To do this, we carried out static leaching tests at pH=4 and 7 and at 25°C in distilled water, cementitious matrices synthesized with different ash/cement/lime ratios (P0, P1, P2, P3, P4, P5 and P6). The static leaching tests carried out on monoliths for 30, 90 and 180 days made it possible to evaluate alteration kinetics of these cementitious matrices through cementitious matrices monitoring of leachate solution pH, of mass losses and dissolution rates. The results obtained show that the pH of all leaching solutions which contained cementitious matrices tend towards a basification causing a significant drift in the pH from the first stages of alteration at pH=4 and 7. The normalized total mass losses of cementitious matrices are higher in neutral medium (pH=7) rather than in acid medium (pH=4) except for the reference cementitious matrice P0. The P5 cementitious matrice (70% Ash + 20% Cement + 10% Lime) presents the lowest mass losses and dissolution rates, while the P0 reference matrice (100% cement) presents the highest mass losses and dissolution rates

Keywords:
heavy metals cement ashes leaching stabilization solidification

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References:

[1]	Kimbatsa F.G., Mouthou, J.L., Bakanahonda, S.F.L. 2018. The household waste management by pre-collection operators in Makélékélé, Bacongo and Talangai districts (Brazzaville, Congo). The journal of Social Sciences "Kafoudal", 2, pp. 12-27.
[2]	Mekhous, S. 2011. Feasibility study of an assessment of health risks associated with the practice of burning waste in the Badamiers gross landfill (Petite-Terre) in Mayotte. School of Advanced Studies in Public Health. Mayotte Island.
[3]	Ouiza Ould A. 2018. Impact of open landfills on Oued Cheliff (Algeria) environmental quality. Thesis from Abdelhamid Ibn Badis Mostaganem University. Algeria. 193p.
[4]	Bouchelaghem, A., 1994. Stabilization and solidification of special industrial waste. Technique, Science and Methods, n°4, 9-13.
[5]	Conner J.R. 1990. Chemical fixation and solidification of hazardous wastes. New York: Van Nostand Reinhold, 692.
[6]	Ecole d’Avignon. 2016. Techniques and practices of Avignon lime. Eyrolles bookstores. France.
[7]	Deschamps T., Benzaazoua M., Bussière B., Belem T. et Mbonimpa M. 2006. Retention mechanism of heavy metals in solid phase: case of stabilization of contaminated soils and industrial waste. Vertigo-the Journal of Environmental Science, 7(2). 11p.
[8]	Jebli, M.B., Youssef, S.B. et Ozturk, I. 2015. The Role of Renewable Energy Consumption and Trade: Environmental Kuznets Curve Analysis for Sub-Saharan Africa Countries. African Development Review, 27(3): 288-300.
[9]	EL Kharmouz M., Sbaa M., Chafi A.et Saadi S. 2013. Study of leachate impact from the former public landfill of city of Oujda (eastern Morocco) on the physicochemical quality of groundwater and surface water. Larhyss Journal, ISSN 1112-3680, No. 16, pp. 105-119.
[10]	Manceau A., Marcus M. A. and Tamura N. 2002. Quantitative speciation of heavy metals in soils and sediments by synchrotron X-ray techniques. In Applications of Synchrotron Radiation in Low-Temperature Geochimistry and Environmental Science. Reviews in mineralogy and Geochimistry, Mineralogical society of America, 49,341-428p.
[11]	Kimbatsa F.G., Mahoungou, E. et Berton Ofouemé Y. 2018. The importance of horticulture in the fight against food insecurity, poverty and environmental protection in Brazzaville (Republic of Congo). OpenEdition Journals Caribbean Studies. 38-40, pp. 1-47.
[12]	Tait J. C., Jensen C. D. 1982. The effect of Zn (II) ion adsorption on the durability of sodium borosilicate glasses, Journal of Non-Crystalline Solids 49, 363-377.
[13]	Mbemba, K. M. 2010. Study of the chemical durability of alkali-resistant glasses of the Cemfil type synthesized from REFIOM with a view to enhancing it as reinforcements in cementitious matrices. Thesis from Marne-la-Vallée University. France. 259p.
[14]	Sterpenich, J. 1998. Alteration of medieval stained glass: Contribution to the study of long-term behavior of confinement glasses. Doctoral thesis from Henri Poincaré University, Nancy I. 464p.
[15]	Chiang, W.S., Ferraro, G., Fratini, E., Ridi, F., Y., Yeh,c Y.Q., Jeng, U.S., Chen, S.H. et Baglioni, P. 2014. Multi-scale structure of calcium and magnesium silicate-hydrate gels. J. Mater. Chem., 2.32.
[16]	Ruiz, A.I., Reyes, E., Argiz, C.,Rubia, M.A. and Moragues, A. 2022. Nano-scale aluminium interaction in synthetic hydrated calcium silicate gel studied by 29Si MAS-NMR. Bol. Soc. Esp. Cerám. Vidr.
[17]	Ahmed Hisseini, B.H. 2021. Treatment by alkali-activation and geopolymerization of clay soils: physicochemical, geotechnical and environmental characterizations. Thesis presented to obtain the Doctor degree from the University of Paris-Est. 222p.
[18]	Bellagh, K. 2017. Valorization of urban soil in the road sector: mobility of pollutants in treated and/or compacted soils. Paris-Est University thesis, 282p.