AMMONIA-FREE DELIMING USING GLYCOLIC ACID AND EDTA AND ITS EFFECT ON TANNERY EFFLUENT AND QUALITY OF LEATHER
In leather processing, deliming is traditionally carried out using ammonium salt which generates a huge amount of ammonia in tannery waste water resulting in toxic effect on aquatic organisms. This research work is an attempt to develop an alternative deliming agent using mixture of glycolic acid and EDTA, which evolves no ammonia and relatively cheap. Deliming value, buffer capacity and calcium solubility of the deliming agent were determined to assess its effectiveness. Sulphide content, NH3-N content, BOD and COD values of the resulting discharge water were analyzed. The developed deliming agent was applied on leather and its physical properties were compared to conventionally delimed leather as well as standard.
TUSHAR UDDIN, MURSHID JAMAN CHOWDHURY, ABDUR RAZZAQ, AL- MIZAN AND ARIFUL HAI QUADERY