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Studies on Bioremediation of Lead by Lead-resistant Microorganisms

机译:耐铅微生物对铅的生物修复研究

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Environmental contamination by toxic metals is a serious problem worldwide due to their incremental accumulation in the food chain and continued persistence in the ecosystem. Conventional technologies, such as ion exchange or lime precipitation, are often ineffective and/or expensive, particularly for the removal of heavy metal ions. The use of microorganisms to destroy, or reduce the concentration of, hazardous waste on a contaminated site is called bioremediation. Such a biological treatment system has various applications, including, cleanup of contaminated sites such as water, soils, sludge, and waste streams. In the present study, bacteria are isolated from effluent collected from an industry located around Hyderabad. An indigenous microbial specie that have high resistance to Lead have been isolated from the wastewater sample which was characterized and identified as Staphylococcus species. Maximum Lead tolerance up to 1000mg/l was evidenced by isolated staphylococcus species, Effect of pH on Lead degradation by Staphylococcus shows the rate of Lead removal was maximum at pH 6, optimum temperature of 30°C and incubation time at 48 hours. Effect of initial metal concentration on Lead degradation by Staphylococcus shows the rate of Lead degradation was constantly high until 300 mg/l and then after it decreased. Under optimum process conditions Staphylococcus is able to degrade Lead up to 83% in 48 hours..
机译:由于有毒金属在食物链中的累积积累和在生态系统中的持续存在,有毒金属对环境造成的污染在全世界范围内都是一个严重的问题。常规技术,例如离子交换或石灰沉淀,通常是无效的和/或昂贵的,特别是对于去除重金属离子而言。使用微生物破坏受污染场地上的有害废物或降低其浓度被称为生物修复。这样的生物处理系统具有各种应用,包括净化受污染的部位,例如水,土壤,污泥和废物流。在本研究中,细菌是从位于海得拉巴附近的一家工厂收集的污水中分离出来的。从废水样本中分离出了对铅具有高抗性的本地微生物,该样本已被鉴定为葡萄球菌。分离的葡萄球菌可证明最大铅耐受性高达1000mg /l。pH对葡萄球菌降解铅的影响表明,在pH 6,最佳温度30°C和48小时孵育时间下,铅去除率最大。初始金属浓度对葡萄球菌对铅的降解的影响表明,铅的降解速率一直很高,直到300 mg / l,然后降低。在最佳工艺条件下,葡萄球菌能够在48小时内降解铅达83%。

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