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环境科学学报 2009
Comparison of two different combined bioleaching-electrokinetic remediation processes
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Abstract:
The combination of bioleaching and electrokinetic remediation has proven to be an effective method to remove heavy metals from municipal sewage sludge. In our study, a simulation was conducted to compare the efficiency of heavy metal removal rates of two different combination processes. Using electrokinetic remediation after bioleaching for 4 d, the contents of Cu and Zn in sewage sludge decreased to 60.5 mg·kg-1 and 170 mg·kg-1, respectively. Simultaneous bioleaching and electrokinetic remediation, on the other hand, reduced the concentration of Cu and Zn to 122.8 mg·kg-1 and 110 mg·kg-1, respectively. Both combined processes allowed the concentrations of Cu and Zn to reach the Chinese standard for land application of sewage sludge. Compared to simultaneous bioleaching and electrokinetic remediation, electrokinetic remediation after bioleaching is preferred because it consumes less energy.
