Developing a Technology for the Regeneration of Active Coal after Pyridine Adsorption from Wastewater

Results are presented for chemical and low-temperature thermal regeneration by air and nitrogen of commercial active coal of AG-OV-1 and SKD-515 trademark spent after pyridine adsorption from model solutions and real wastewaters. Inexpediency of chemical regeneration is demonstrated. Basing on the data of thermogravimetric analysis, an optimum temperature value has been chosen for the regeneration of the active coals by means of nitrogen and air flow. A comparative analysis has been performed concerning the efficiency of low-temperature thermal regeneration in inert and oxidizing media. The results obtained have allowed the low-temperature thermal regeneration by means of an inert gas (nitrogen) to be recommended for practical purposes.