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The change of pH value in the wastewater, the characteristics of Carbonate precipitation and hydroxide precipitate by Pb, the adsorption and co-precipitation characteristics with the hydrated oxides of iron and aluminum and calcite have been researched by CO2 bubbling. After CO2 was bubbled to the high alkaline wastewater, showed the pH value of waste and the content of Pb after filtering was measured by Inductively Coupled Plasma (ICP), and then analyzed the precipitate by X-ray powder diffraction (XRD). The co-precipitation characteristics of Pb in highly alkaline waste by CO2 bubbling was simulated by PHREEQC. The results showed that CO2 neutralized the high alkaline waste effectively, and the content of Pb was significantly decreased. The outcome showed that the sediment mainly consisted of CaCO3 and Pb in it. Hydroxide made in high pH value, and co-precipitation with CaCO3 created by CO2 continuing through into. Iron and aluminum hydroxide can adsorbent copper, but the phenomenon is not obvious because the amount of colloid is low. Keywords-co-precipitation; adsorption; wastewater; CO2; PHREEQC

The Co-precipitation Characteristics of Pb in Highly Alkaline Wastewater by CO2 Bubbling