Bioremediation of waste water sludge from heavy metals
Remediation of water waste sludge ( WWS) contaminated by heavy metals is very important standpoint of safety environment, as well as for its application in agriculture as a fertilizer. Tens of millions tons of dry sludge is produced annually in the world. The WWS usually contains numerous contaminants; heavy metals, nitrogen, phosphorus and different organic compounds. The significant amount of heavy metals in WWS represents a major waste-management problem. The objective of this research work is to evaluate the efficiency of the bioremediation technology using chemolithotrophic bacteria for removing of heavy metals from WWS. The bioleaching of heavy metals from WWS of Yerevan, Kuryanovsk (Moscow) and Austrian waste water treatment stations have been carried out. The existence of various heavy metals such as As, Cd, Cu, Hg, Co, Ca, PI, Zn, Fe, Mn, Al in WWS in amount prevailing over the permissible quantities for using it as fertilizer have been shown. For the purpose of bioleaching of heavy metals from WWS the strains of sulfur-and iron-oxidizing bacteria (A, ferrooxidans, L. ferrooxidans, A. thiooxidans) including thermophiles (S. thermosulfooxidans) from sulfide deposits of Armenia have been isolated. Their morphophysiological, biochemical and metal leaching properties have been studied. Bioleaching of heavy metals from WWS by isolated strains of chemolithotrophic bacteria in different conditions; pulp concentrations, temperature, additional energy sources, etc. have been carried out. It was shown that sulfur-oxidizing bacteria in comparison with iron-oxidizing bacteria are much more active in the solubilisation of heavy metals from WWS. Our investigations showed the effectiveness and perspectives of application of microbial leaching technology for the remediation of heavy metals contaminated waste water sludge.
bioremediation heavy metals chemollthotrophic bacteria
Levon Markosyan Narine Vardanyan
Center of Microbiology and Microbial Depository of NAS of Armenia, 2201, Abovian city, Armenia Center of Microbiology and Microbial Depository of NAS of Armenia, 2201, Abovian city, Armeni
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
1096-1105
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）