The digestive system of a worm is capable of heavy metal ions detaching from aggregates between these ions and humic substances in the waste as it rots (Pattnaik and Reddy, 2012). I the process of enzymes activation the assimilation of metal ions is mediated by worms. I another research conducted by Turpeinen (2002) it is claimed that different bacteria, fngi, agae and actinomycetes are able to consume large amount of heavy metals. Te researcher underlines a special ability of Chlorella, Aabaena inaequalis, Wstiellopsis prolifica, Sigeoclonium tenue, Snechococcus sp. pcify Nvertheless it is always difficult to choose appropriate strategies for heavy metals extraction.
Atually, te scientists of previous years were focused on biosorption (a combination of absorption and adsorption). Tere was a higher level of Cd++ and Ni++ I in comparison with laboratory cells. Fngi are able to absorb heavy metals by their cells too (Malik, 2004). Dfferent types of cells are effective in a serious struggle against heavy metals presence in soil and water. Frstly, i is possible to remove heavy metals in accordance with the following mechanisms: () Independent accumulation metals in the process of metabolism.
Te positive charge of ions attracts negative charges of heavy metals. It is possible to illustrate this process by the following example: “hizopus arrhizus adsorption depends on ionic radius of Li3+, M2+, C2+, Z2+, C2+, B2+, H2+ and Pb2+. Hwever, bnding of Hg2+, A2+, C2+, 13+, N2+, C2+ and Pb2+ strongly depends on concentration of yeast cells” (Jayabarath, Sndar, Aulmurugan, Gridhar, 2009). () Dependent accumulation of heavy metals in the process of metabolism. Havy metal ions are transferred to cells basing on the cell membrane. Nvertheless, ins precipitated the cells, ad are collected intracellularly as compared with metal-binding proteins.
Tere are many external factors, wich exert a serious influence on heavy metals absorption. Tese are: p, aions, ctions and organic materials etc (Environmental Biotechnology). Mreover, i another study microbial strains were isolated from the soil of metallurgical environment. I the result of heavy metals bioremediation 72 acidothermophilic autotrophic microbes were isolated obtained bioabsorption potentiality. Havy metals were checked for their biosolubilization ability. Tus, i...
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