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17.4.1 Wastewater Treatment

Recent research demonstrated that bacteria can enable recovery of valuable elements or further containment of highly toxic or radioactive species [15,20,58]. It is clear that some microbiological methods for the treatment of metal-containing wastes offer potentially efficient and cost-effective alternatives [59]. Actually, the high removal efficiency (almost 99%) of heavy metals could be obtained by using bacteria in batch system containing mixture metal solution (Figure 17.8). To increase the removal efficiency of heavy metal, the sequent bioreactor can be conducted in bacterial biosorption or adjunct to existing treatment technologies.

Contacting large volumes of metal-bearing aqueous solutions with microbial biomass in con-vectional unit processing operation is not typical because of the solid and liquid separation problems. Recent cell immobilization technology is therefore often studied for its potential to improve

Bioreactor

Metal removal from wastewater

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