“…The presence of sulphide, ammonia and other volatile compounds are toxic to environment. At the same time, it also results in solid waste, including animal skin trims, animal hairs, flesh wastes, and keratin wastes, whose protein content is responsible for dangerous pollution problems to environment (Jaouadi et al, 2018;Călin et al, 2017). There are many countries where leather industry brings social and economic benefits in daily lives, but on the other hand, the industry has a negative impact on environment (Kanagaraj et al, 2015;Elhoul et al, 2020;Wu et al, 2017).…”