In compliance to European Union directives to reuse urban wastes as secondary fuels, the aim of present work was to investigate and control the environmental impact from disposal of ashes generated by combustion of a bio-solid, an olive by-product and their blend. Two waste materials were admixed with the ash and their performance as potential stabilizers was assessed. Metals and ions leached through a soil were measured.

The results showed that dissolution of some alkaline substances raised the pH of water effluents, decreasing the extractability of heavy metals from the ashes. In some cases Cr and As leached reached hazardous levels. Upon addition of waste materials to ash, the concentration of Cr in liquid extracts was reduced by 35–97%, while that of Cu and As by 100%. All heavy metal values measured in the leachates were decreased to values below legislation limits. The mineralogy, the chemistry and the pH of solids involved were key factors for the retention of elements.

根据欧洲联盟关于将城市废物作为二次燃料再利用的指令，当前工作的目的是调查和控制由于生物固体，橄榄副产物及其混合物燃烧产生的灰烬的处置对环境的影响。将两种废料与灰烬混合，评估它们作为潜在稳定剂的性能。测量了通过土壤浸出的金属和离子。

结果表明，某些碱性物质的溶解会提高废水的pH值，从而降低灰烬中重金属的提取能力。在某些情况下，铬和砷的浸出达到危险水平。将废料添加到灰中后，液体提取物中的Cr浓度降低了35-97％，而Cu和As的浓度降低了100％。渗滤液中测得的所有重金属值均降至低于法律规定的限值。所涉及的固体的矿物学，化学性质和pH是保留元素的关键因素。