Recycling of the incinerator bottom ash, which is discharged from solid waste treatment plants, is important since the landfilling capacity is limited, and if it is left untreated, it would generate a great environmental burden. Besides, the incinerator bottom ash has a similar chemical composition to that of cement and therefore it can be used as a substitute raw material in cement manufacturing. This recycling method would, in turn, reduce the consumption of natural resources, such as limestone and clay. Generally speaking, a high concentration of chloride leads to severe corrosion of steel, which can damage the reinforced concrete structure. The removal of chloride ions from the ash should, therefore, be carried out in advance to use it as a raw material for cement production. Thus, this study aims to find an effective method for eluting chloride ion from the incinerator bottom ash for recycling. One of the main findings of this work was that the residual chloride concentration in the incinerator bottom ash was reduced to 1.70 g/kg, eluting 87.78% of initial Cl concentration, when the ash was washed with an acetic acid solution (concentration: 1.5 mol/L) saturated with CO₂ micro-bubbles.

固体废物处理厂排放的焚化炉底灰的回收非常重要，因为其填埋能力有限，如果不加以处理，将会产生巨大的环境负担。此外，焚烧炉底灰的化学组成与水泥相似，因此可以用作水泥制造的替代原料。反过来，这种回收方法将减少自然资源的消耗，例如石灰石和粘土。一般而言，高浓度的氯化物会导致钢材严重腐蚀，从而损坏钢筋混凝土结构。因此，应事先从灰分中除去氯离子，以将其用作水泥生产的原料。从而，这项研究旨在找到一种有效的方法，从焚烧炉底灰中洗脱氯离子，以进行回收利用。这项工作的主要发现之一是，当用乙酸溶液（浓度：1.5 mol）洗涤灰烬时，焚烧炉底灰中的残留氯化物浓度降低至1.70 g / kg，洗脱出最初的Cl浓度为87.78％。 / L）充满CO_2个微气泡。