1.0 Introduction
Lead (Pb) is non-bioessential persistent and hazardous heavy metal pollutant of environmental concern. Bioremediation has, become a potential alternate to the existing technologies for the removal and recovery of toxic lead from motor battery dumping area. (Amini et al., 2008).
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 line 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 (Amini et al.,2008). Indigenous microbial specie that has high resistance to lead have been isolated from the waste water sample, which was characterized and identified as Staphylococcus species. Maximum lead tolerance up to 100mg/ml was evidenced by isolated Staphylococcus species, effect on pH on lead degradation by Staphylococcus shows the rate of lead removal was maximum at pH6, optimum temperature of 30o
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 300mg/l and then after it decreased. Under optimum process conditions Staphylococcus is able to degrade lead up to 83% in 48 hours, (Amini, et al., 2008). In microbiology, the term isolation refers to the separation of a strain from a natural, mixed population of living microbes as present in the environment, for example in soil flora water, or from living being with skin flora, oral flora or gut flora, in order to identify the microbes of interest. Historically, the laboratory techniques of isolation first developed on the field of bacteriology and Parastiology (during the 19th
century before those in virology during the 20th
century. Methods of microbial isolation have drastically changed over the past 50 years from a labor perspective with increasing mechanization and in regard to the technology involved. Environmental biotechnology strategies must address and solve in a long-term perspective, the formidable environmental problem facing the world, such as soil contamination with pesticides, metals or hydrocarbon, disposal of animal manures, treatment of waste waters or recovery of revisable products and energy from wastes (Singh et al., 2010).There is therefore a need to isolate, identify and characterize the microorganisms that exist and interact in contaminated environment. (Singh et al., 2010).
To isolate and characterize highly lead tolerant microorganism.
To determine the lead content of soil samples.
To determine the pH (acidity and alkalinity) of the soil samples.