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Keywords = Loh Kar Woon

  • Open Access Research Article
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    Trends Journal of Sciences Research 2021, 1(1), 9-22. http://doi.org/10.31586/wastewater101002
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    Abstract
    Among natural materials, clays occupy a prominent position being low cost, available in abundance, environmentally friendly, and having good adsorption properties. Bentonite, which has strong affinity towards cationic dyes such as methylene blue (MB) is able to remove dye effectively. It is very economical if the spent adsorbent can be
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    Among natural materials, clays occupy a prominent position being low cost, available in abundance, environmentally friendly, and having good adsorption properties. Bentonite, which has strong affinity towards cationic dyes such as methylene blue (MB) is able to remove dye effectively. It is very economical if the spent adsorbent can be recovered and reused for many cycles. Hence, this study investigated the ability of sodium persulfate (Na2S2O8) (SPS) to regenerate bentonite loaded with MB. The modification of raw bentonite with SPS was also investigated. The results showed that after added with SPS, the bentonite and MB adsorbed and flocculated together to form large flocs that were firm and compact. The process adsorption and flocculation was very efficient and equilibrium was reached within one hour. However, the modification of raw bentonite may not be a good option as the flocs formed were loose and less compact. High water retention of the flocs would cause disposal issue during dewatering process. The flocculation mechanism of MB-loaded bentonite can be explained in macroscopic and microscopic level. In macroscopic level, charge neutralization and bridge formation are the main mechanism while in microscopic level, increase in interlayer spacing and extensive cation exchange with MB are the one that contribute to flocs formation. Besides that, dimerization and trimerization also contribute to total MB adsorption which also allow bigger flocs formed. However, the ability of SPS to degrade MB adsorbed to bentonite through oxidation process does remain uncertain. Instead of regeneration, flocculation of MB-loaded bentonite upon addition of SPS occurred to remove the dye effectively. For reusability study, the MB-loaded bentonite can be used up to 3 cycles with percentage removal of 95%. Hence, SPS, as a flocculation promoting agent can be further studied and investigated, to be used in large scale in colour wastewater treatment.  Full article
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    References
    [1]
    Liang, C. J., Bruell, C. J., Marley, M. C. & Sperry, K. L. (2003) Thermally Activated Persulfate Oxidation of Trichloroethylene (TCE) and 1,1,1-Trichloroethane (TCA) in Aqueous Systems and Soil Slurries. Soil and Sediment Contamination: An International Journal, 12, 207-228.
    [2]
    Krzemińska, D., Neczaj, E. & Borowski, G. (2015) Advanced oxidation processes for food industrial wastewater decontamination. Journal of Ecological Engineering, 16, 61-71.
    [3]
    Ghauch, A., Tuqan, A. M. & Kibbi, N. (2012a) Ibuprofen removal by heated persulfate in aqueous solution: A kinetics study. Chemical Engineering Journal 197, 483–492.
    [4]
    Mckay, G., Ramprasad, G. & Mowli, P. 1987. Desorption and regeneration of dye colours from low-cost materials. Water Research, 21, 375-377.
    [5]
    Ghauch, A., Tuqan, A. M., Kibbi, N. & Geryes, S. (2012b) Methylene blue discoloration by heated persulfate in aqueous solution. Chemical Engineering Journal, 213, 259-271.
    [6]
    Antoniou, M. G., De La Cruz, A. A. & Dionysiou, D. D. (2010) Degradation of microcystin-LR using sulfate radicals generated through photolysis, thermolysis and e− transfer mechanisms. Applied Catalysis B: Environmental, 96, 290-298.
    [7]
    Rickman, K. A. & Mezyk, S. P. 2010. Kinetics and mechanisms of sulfate radical oxidation of β-lactam antibiotics in water. Chemosphere, 81, 359-365.
    [8]
    Yuan, R., Ramjaun, S. N., Wang, Z. & Liu, J. (2011) Effects of chloride ion on degradation of Acid Orange 7 by sulfate radical-based advanced oxidation process: Implications for formation of chlorinated aromatic compounds. Journal of Hazardous Materials, 196, 173-179.
    [9]
    Gürses, A., Doğar, Ç., Yalçın, M., Açıkyıldız, M., Bayrak, R. & Karaca, S. (2006) The adsorption kinetics of the cationic dye, methylene blue, onto clay. Journal of Hazardous Materials 131(1), 217-228.
    [10]
    Doğan, M., Özdemir, Y. & Alkan, M. (2007) Adsorption kinetics and mechanism of cationic methyl violet and methylene blue dyes onto sepiolite. Dyes and Pigments, 75, 701-713.
    [11]
    Li, Z., Chang, P. H., Jiang, W. T., Jean, J. S. & Hong, H. (2011b) Mechanism of methylene blue removal from water by swelling clays. Chemical Engineering Journal, 168, 1193-1200.
    [12]
    He, J., Hong, S., Zhang, L., Gan, F. & Ho, Y. S. (2010) Equilibrium and thermodynamic parameters of adsorption of methylene blue onto rectorite. Fresenius Environmental Bulletin, 19, 2651-2656.
    [13]
    Azha, S. F., Ahmad, A. L. & Ismail, S. (2014) Thin coated adsorbent layer: characteristics and performance study. Desalination and Water Treatment, 55, 956-969.
    [14]
    Doulia, D., Leodopoulos, C., Gimouhopoulos, K. & Rigas, F. (2009) Adsorption of humic acid on acid-activated Greek bentonite. Journal of Colloid and Interface Science, 340, 131-41.
    [15]
    Liang, C., Huang, C.-F. & Chen, Y.-J. (2008) Potential for activated persulfate degradation of BTEX contamination. Water Research, 42, 4091-4100.
    [16]
    Huling, S. G., Ko, S., Park, S. & Kan, E. (2011) Persulfate oxidation of MTBE- and chloroform-spent granular activated carbon. J. Hazard. Mater., 192, 1484-1490.
    [17]
    Mora, V. C., Rosso, J. A., Mártire, D. O. & Gonzalez, M. C. (2011b) Phenol depletion by thermally activated peroxydisulfate at 70C. Chemosphere, 84, 1270-1275.
    [18]
    Leodopoulos, C., Doulia, D. & Gimouhopoulos, K. (2014) Adsorption of Cationic Dyes onto Bentonite. Separation & Purification Reviews, 44, 74-107.
    [19]
    Tahir, S. S. & Rauf, N. (2006) Removal of a cationic dye from aqueous solutions by adsorption onto bentonite clay. Chemosphere, 63, 1842-8.
    [20]
    Li, Z., Chang, P.-H., Jiang, W.-T., Jean, J.-S. & Hong, H. (2011a) Mechanism of methylene blue removal from water by swelling clays. Chemical Engineering Journal, 168, 1193-1200.
    [21]
    Wang, Y., Gao, B., Xu, X., Xu, W. & Xu, G. (2013) Characterization of floc size, strength and structure in various aluminum coagulants treatment. China postdoctoral Science Foundation, 5, 1-34.
    [22]
    Renault, F., Sancey, B., Badot, P. M. & Crini, G. (2009) Chitosan for coagulation/flocculation processes – An eco-friendly approach. European Polymer Journal, 45, 1337-1348.
    [23]
    Belter, P. A. (1988) Bioseparations: downstream processing for biotechnology, New York, John Wiley & Sons, Inc.
    [24]
    Luckham, P. F. & Rossi, S. (1999) The colloidal and rheological properties of bentonite suspensions. Advances in Colloid and Interface Science 82, 43-92.
    [25]
    Villar, M. V., Gómez-Espina, R. & Lloret, A. (2009) Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite Journal of Rock Mechanics and Geotechnical Engineering, 2(1), 71-78.
    [26]
    Jarvis, P., Jefferson, B. & Parsons, S. A. (2005b) measuring Floc Structural Characteristics. Reviews in Environmental Science and Biotechnology, 4(1-2), 1-18.
    [27]
    Bushell, G. C., Yan, Y. D., Woodfield, D., Raper, J. & Amal, R. (2001) On techniques for the measurement of the mass fractal dimension of aggregates. Adv. Colloid Interface Science, 95, 1-50.
    [28]
    Mengel, D. B. (2011) Fundamentals of Soil Cation Exchange Capacity (CEC). Department of Agronomy, Purdue University.
    [29]
    Jarvis, P., Jefferson, B. & Parsons, S. A. (2005a) Breakage, regrowth, and fractal nature of natural organic matter flocs. Envtion. Sci. Technl., 39, 2307-2314.
    [30]
    Biggs, C. A. & Lant, P. A. (2000) Activated sludge floccualtion : on-line determination of floc size and the effect of shear. Water Researh, 34, 2542-2550.
    [31]
    Veroni, M. (1995) Clays: Controlling the Environment, Australia, CSIRO.
    [32]
    Cenens, J. & Schoonheydt, R. A. (1998) Visible spectroscopy of methylene blue on hectorite, laponite b, and barasym in aqueous suspension. Clays Clay Miner, 36, 214–224
    [33]
    Schoonheydt, R. A. & Heughebaert, L. (1992) Clay adsorbed dyes: methylene blue on laponite. Clay Minerals, 27, 91-100.
    [34]
    Avena, M. J., Valenti, L. E., Pfaffen, V. & Pauli, C. P. D. (2001) Methylene blue dimerization does not interfere in surface-area measurements of kaolinite and soils. Clays Clay Miner, 49, 168–173.
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