APPLICABILITY OF CRUSHED CLAY BRICK AND MUNICIPAL SOLID WASTE SLAG AS LOW-COST ADSORBENTS TO REFINE HIGH CONCENTRATE Cd (II) AND Pb (II) CONTAMINATED WASTEWATER

Authors

  • G.M.P. Kumara
  • Ken Kawamoto

Keywords:

Added value, Deprotonation, Desorption, Metal systems, MSW slag

Abstract

Along with population growth, rapid urbanization, and industrialization, the generation of waste
and industrial by-products is increasing enormously and causing many environmental and social issues. In
order to examine effective applications of waste and industrial by-products, this study aimed to investigate the
effective use of crushed waste clay bricks (CCB) and municipal solid waste slag (MSWS) as low-cost
adsorbents to treat high concentrated wastewater. A series of batch adsorption experiments were carried out to
investigate the effects of contact time, initial concentration, pH, ionic strength, and competitive metals on Cd2+
and Pb2+ adsorption onto the tested adsorbents. The Langmuir model performed well by the fitting Cd2+ and
Pb2+ adsorption isotherms. The maximum adsorption capacity of Pb2+ (3.4-5.5 mg/g) was higher than the Cd2+
(2.3-3.2 mg/g) for both adsorbents. CCB showed high removal of metals, but a higher dependency on the metal
system (single, binary, or multi-metals). Interestingly, MSWS showed lower removal of metals but less
dependency on the metal system for Cd2+ and Pb2+. Adsorption of tested adsorbents was mainly controlled by
deprotonation or ion exchange at the natural pH, and at the higher pH (>9 for Cd2+ and >7 for Pb2+), surface
precipitation was the predominant mechanism for Cd2+ and Pb2+ removal (>60%). Overall, tested adsorbents
were showed comparatively good performance in treating high concentrated wastewater, but future studies
under different conditions and with modification to apply CCB and MSWS fines as better low-cost adsorbents
to treat wastewater are essential.

 

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Published

2019-04-20

How to Cite

G.M.P. Kumara, & Ken Kawamoto. (2019). APPLICABILITY OF CRUSHED CLAY BRICK AND MUNICIPAL SOLID WASTE SLAG AS LOW-COST ADSORBENTS TO REFINE HIGH CONCENTRATE Cd (II) AND Pb (II) CONTAMINATED WASTEWATER. GEOMATE Journal, 17(63), 133–142. Retrieved from https://geomatejournal.com/geomate/article/view/2157