biological leaching of plating residue using penicillium simplicissimum

The management of industrial wastes is an important aspect of environmental engineering that not paying attention to it can cause so many problems including loss of valuable metals, pollution of the environment and human health risks# among them, plating residue (pr) is classified as hazardous waste# biological leaching is an efficient method of recovering metals from pr and can decrease heavy metal toxicity# in this research, at first, the optimal culture medium among four culture mediums (czapek dox broth, czapek dox broth-modified, bosshard and malt extract) was investigated# finally, bosshard was chosen as appropriate culture medium for leaching of pr# in the next stage, bioleaching of ni, cr, and cu from pr was conducted in different pulp density of 5, 10, 20 and 40 g/l# eventually, the highest recovery of heavy metals (ni: 186000 mg/kg, cr: 45000 mg/kg and cu: 12000 mg/kg) happens in the pulp density of 5 g/l#