Research on Treatment of Leaded Wastewater by Process Combined Fe/C Micro-Electrolysis with Microbial Adsorbent-Flocculant

The various affecting factors have been researched in this paper that the leaded wastewater was treated by means of the processing combined Fe-C micro-electrolysis with microbial adsorbent-flocculant. After that combined process, a greater percentage of lead removal was observed. The results showed that under the condition that initial PH of the infall wastewater is 3, the Fe/C mass ratio is 2:1, and the hydraulic retention time is 40 min for the micro electrolysis processing. The PH is 9, the microbial adsorbent-flocculant (ZX-1) dosage is 0.5g/L, and adsorption time is 90 min for subsequent microbial adsorption-flocculation. Under these optimal conditions, the removal rates of lead ion reached 99.958%,and their concentrations in wastewater were 0.042mg/L, which their ion concentrations in the outlet wastewater are under the class III of Surface Water Quality Standards(GB3838-2002) in China. That combined process achieved zero discharge of lead. It has been also showed that Pb ions are mainly removed by Fe/C micro-electrolysis, and the following microbial adsorption-flocculation excels at treating leaded wastewater of low concentration.