摘要：研究在CO2曝气过程中，废液 pH值变化，Cu自身形成的碳酸盐沉淀与氢氧化物沉淀，以及形成的碳酸钙，氢氧化铁和氢氧化铝对其的吸附。向高碱性废液中逐渐通入CO2，测量废液的pH，用电感耦合等离子体分析仪（ICP）测量过滤后废液中Cu的含量，用X射线衍射分析仪（XRD）分析过滤后的沉淀。利用PHREEQC模拟CO2曝气过程高碱性废液中Cu的混合沉淀特性。结果表明：通入CO2后，能有效的中和溶液的pH，Cu的去除率逐渐增高。沉淀物的主要成分是碳酸钙，并且沉淀物中含有Cu。在高pH时铜主要生成氢氧化物沉淀，继续通入CO2，主要与CaCO3生成共沉淀。氢氧氧化铁、铝胶体对铜具有吸附作用，但由于胶体含量低吸附效果不明显。

Abstract: The change of wastewater pH value, the characteristics of formation of insoluble metal hydroxide precipitate and metal Carbonate precipitate, the adsorption and coprecipitation characteristics of heavy metal ions with the hydrated oxides of iron and aluminium and calcite have been researched by bubbling of CO2. After CO2 was gradually bubbled to the high alkaline waste, the value of waste pH was measured and the metal ion in waste water was measured by Inductively Coupled Plasma (ICP). Moreover, the precipitated sediments principally CaCO3 was inspect by X-ray powder diffraction (XRD).The complicated precipitation characteristics of Cu in high alkaline wastewater by addition of CO2 was simulated by PHREEQC. The results showed that the amount of Cu was significantly decreased after CO2 was gradually bubbled to the high alkaline waste. The outcome showed that the sediment primarily consisted of CaCO3 and the other heavy metals are Cu. The adsorption of Cu on Fe and Al colloid and co-precipitation with CaCO3 was investigated in detail. Iron and aluminum hydroxide can adsorbent copper, but the effect is not obvious because the amount of colloid is low.