“…It was observed that at 7 days of incubation, 71%, 69%, and 96.4%, of the heavy metals present in the water contaminated were removal, respectively ( Figure 2 ). The metal removal capability by the biomass of A. niger is equal to or greater than the other biomasses that have been studied, like the removal of mercury, cadmium, an copper (4.79%, 10.25%, and 5.49%, respectively), using R. mucilaginosa planktonic cells during 48 hours [ 17 ], the metal removals during two-step process using A. niger reached 84.3%, 84.4%, 25%, and 14.4% for copper, cadmium, lead, and zinc, respectively [ 12 ], the removal of cadmium (II) (95%), lead (II) (88%), iron (III) (70%), copper (II) (60%), nickel (II) (48.9%), manganese (II) (37.7%), and zinc (II) (15.4%), from industrial wastewater in batch systems by immobilized cells of A. niger [ 20 ], the use of the extracellular media of Alternaria alternata- containing organic acids and siderophores for the metal leaching (vanadium, aluminum, molybdenum, magnesium, iron, nickel, arsenic, and chromium) [ 32 ], the removal of 67% of arsenic (III) from samples of groundwater contaminated with 1 mg/L from the metalloid, coming from Zimapan, Hidalgo's state, Mexico [ 36 ], the 99.35% removal of copper with pure and modified chitosan hydrogels from shrimp shell, from copper leachate [ 37 ], Saccharomyces cerevisiae and Torulaspora delbrueckii decrease in 98.1%, 83.0%, 60.7%, 60.5%, and 54.2% for turbidity, sulphates, BOD, phosphates, and COD, respectively, of the tannery effluent [ 38 ], C. tropicalis removed 40% of cadmium (II) from the wastewater after 6 days and was also able to remove 78% from the wastewater after 12 days [ 28 ], and S. cerevisiae “wild-type” (WT) parental strain BY4741, very efficient in removing manganese (II), copper (II), and cobalt (II) from synthetic effluents containing 1-2 mM cations [ 39 ]. Industrial effluents often contain more than one type of metal ion; these may interfere in the removal/recovery of the metal ion of interest.…”