Removal of Drugs in Polluted Waters with Char Obtained by Pyrolysis of Hair Waste from the Tannery Process

This study shows how the pyrolysis process applied to the treatment of hair, which is currently disposed in landfills, helps improve conditions and obtain a product that could be applied in other processes such as adsorption of contaminants

Francisco Rodríguez; Carolina Montoya-Ruiz; Idoia Estiati; Juan F. Saldarriaga

2020

Scholarcy highlights

  • The presence and final destination of active pharmaceutical compounds in water constitute one of the emerging events in current environmental chemistry
  • In the preliminary tests of heavy metals carried out on tannery hair, a high concentration of calcium was observed. This is because of the conventional process of treating the skin with sodium sulfide, and lime, causing the sulfide to dissolve keratin, and the hydrated lime converts the aqueous buffer to an alkaline pH. Some authors have found that the most important structural components of hair are lipids, fats, and proteins like keratin, biotin, etc., which are mostly composed of minerals such as calcium, zinc, potassium, iron, and magnesium. the chars from the pyrolysis process have undergone an analysis of heavy metals to determine if after the pyrolysis process these metals are deposited in the char or, transformed into the gas or liquid state
  • Four chars have been obtained from different temperatures, finding that C4 is the one with the best properties
  • It can be concluded that the pyrolysis of cow hair from tanneries in a fixed-bed reactor and a temperature of 450 °C produces a material with interesting physical and chemical conditions to be used as an adsorbent both activated and nonactivated in API removal
  • This study could be the beginning of the use of hair residues in pyrolysis to obtain a char with properties for the removal of compounds that are problematic for the environment
  • The concns. in a major tributary to a lake were significantly higher than those in the outflow of this lake. It is estd. that more than 90% of the diclofenac entering the lake is eliminated in the lake, most likely by photolytic degrdn
  • A clear selection of a proper BET linear region was possible for the material possessing only ultra-micropores. These results indicate that the BET surface areas detd. from CO2 isotherms at 273 K may be considered reasonable for adsorbents contg. only ultra-micropores where the BET surface areas based on N2 or Ar isotherms at cryogenic temps. are not available

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