Polymeric encapsulation of heavy metal bearing sludge
1996
Tio, B.DJ. | Arellano, F.A. (Department of Science and Technology, Bicutan, Taguig, Metro Manila (Philippines). Industrial Technology Development Inst.)
The study attempted to use polymeric encapsulation as a viable alternative for the handling of heavy metal bearing sludges produced from the wastewater treatment operations of semiconductor firm. Two encapsulation materials were used in the experiments; a thermoplastic and a thermoset. Virgin polypropylene resin was used for the thermoplastic encapsulation and the unsaturated polyester resin was used in the thermoset encapsulation. For thermoplastic encapsulation, a 30 percent concentration was found to be an ideal value during blending/compounding. The thermoplastically encapsulated experimental slabs were subjected to tensile, impact, morphological, and leaching tests. Results of these tests showed that tensile strength of the materials is decreased as the sludge content is increased while that of impact test almost remain unchanged. Morphological analyses revealed that binding of sludge particles was merely physical entrapment through encapsulation. For the thermoset encapsulation, mixture with 60 percent sludge gave satisfactory results based on its consistency, moldability and smooth appearance of the uncapsulated artwares. The artwares were stored at varying conditions for one month and was found to have no remarkable change. Leaching test confirmed that polymeric encapsulation immobilized heavy metal content of the sludge
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