Double Pyrolysis of Chrome Tanned Leather Solid Waste for Safe Disposal and Products Recovery
نویسنده
چکیده
Disposal of chrome tanned leather waste (CTLW) generated in leather processing industries has many environmental implications. This paper presents a double pyrolysis (PI & PII) method to dispose hazardous chrome tanned leather solid waste by converting it into useful products. When CTLW was subjected to double pyrolysis, three major products obtained were; (i) an energy enriched combustible gas (32.01% PI & 42.45% PII ); (ii) a high fraction condensate (33.32% (PI & PII)) and (iii) a carbonaceous residual ash containing trivalent chromium (34.67%PI & 24.23% -PII). In addition, 2.73% of liquid fuel, 75.24% of nitrogen enriched liquid and 22.03% distillate tar as sub-products from the high fraction condensate. SEM, GC-MS, H & C NMR and TGA revealed that the products were free from toxic chromium species and contains both aliphatic and aromatic hydrocarbons. The residual ash displayed high thermal stability when run under nitrogen atmosphere (simulating 1 pyrolysis). The observations on generation of no toxic compounds upon double pyrolysis, suggests the suitability of this process towards achieving safe disposal of hazardous leather solid waste and to recover useful products.
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