The presence and composition of ash in solid waste streams produced by the thermochemical processes can affect the further disposal or use of the waste. This study characterised the chemical species, mineralogy and trace element mobilisation in laboratory-produced ashes arising from different municipal solid waste (MSW) streams processed under reducing and oxidising atmospheres.

The composition of cumulative ash samples produced under oxidising conditions was very similar to the composition of the industrial bottom ash samples produced during MSW incineration. We identified differences in mineral phase compositions and in some trace element concentrations of ashes produced under combustion and gasification conditions. Differences in concentrations of boron, barium, cadmium, chromium, copper, chlorine, molybdenum, antimony, lead, thorium and zinc in ashes associated with different MSW streams were also observed. On the basis of the concentrations of trace elements in ashes, we evaluated each MSW stream in terms of potential management strategies and use of the mineral matter remaining after combustion and gasification. Most of ashes produced from MSW can be at least classified as Class IV (secure) waste according to an Australian standard regulation guideline.

由热化学过程产生的固体废物流中灰分的存在和组成会影响废物的进一步处置或使用。这项研究的特点是，在还原和氧化气氛下处理的不同城市固体废物（MSW）流产生的实验室生产的灰中的化学物种，矿物学和微量元素迁移。

在氧化条件下产生的累积灰分样品的组成与垃圾焚烧过程中产生的工业底灰分样品的组成非常相似。我们确定了矿物相组成的差异以及在燃烧和气化条件下产生的一些灰烬中微量元素浓度的差异。还观察到了与不同城市固体废弃物流相关的灰烬中硼，钡，镉，铬，铜，氯，钼，锑，铅，or和锌的浓度差异。根据灰烬中微量元素的浓度，我们根据潜在的管理策略和燃烧和气化后剩余矿物质的使用情况评估了每个城市固体废弃物流。