Screening of Heavy Metal Tolerant Microbes in Sludge and Removal Capability of Lead

摘要

The sludge in solid waste dismantling area is often seriously polluted by heavy metals, while some microbes are resisting to heavy metal pollutants due to their life activities such as gene mutations, secretion change and physiology adjustment. This paper identifies two kinds of microorganisms, namely Penicillium citrinum and Aspergillus niger, which can resist heavy metals in the sludge in solid waste dismantling area. By discussing the removal capacity of these two microorganisms on Pb2+ under different conditions of pH value, microbial quantity and initial concentration. Results show that these factors have great influence on adsorption of Pb2+, when the initial concentration is 30 mg/L and the bacterium fluid volume is 2 ml. The removal rate is the highest under such condition. The comparative experiments show that removal capacity of Penicillium citrinum is better than Aspergillus niger. Heavy metal ions can be effectively removed by both types of microorganisms.