Rodella N, Pasquali M, Zacco A, Bilo F, Borgese L, Bontempi N, Tomasoni G, Depero L E, Bontempi E
INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, Brescia 25123, Italy.
University of Brescia, via Branze 38, Brescia 25123, Italy.
Heliyon. 2016 Sep 20;2(9):e00163. doi: 10.1016/j.heliyon.2016.e00163. eCollection 2016 Sep.
A sustainable economy can be achieved only by assessing processes finalized to optimize the use of resources. Waste can be a relevant source of energy thanks to energy-from-waste processes. Concerns regarding the toxic fly ashes can be solved by transforming them into resource as recycled materials. The commitment to recycle is driven by the need to conserve natural resources, reduce imports of raw materials, save landfill space and reduce pollution. A new method to stabilize fly ash from Municipal Solid Waste Incinerator (MSWI) at room temperature has been developed thanks to COSMOS-RICE LIFE+ project (www.cosmos-rice.csmt.eu). This process is based on a chemical reaction that occurs properly mixing three waste fly ashes with rice husk ash, an agricultural by-product. COSMOS inert can replace critical raw materials (i.e. silica, fluorspar, clays, bentonite, antimony and alumina) as filler. Moreover the materials employed in the stabilization procedure may be not available in all areas. This paper investigates the possibility of substituting silica fume with corresponding condensed silica fume and to substitute flue-gas desulfurization (FGD) residues with low-cost calcium hydroxide powder. The removal of coal fly ash was also considered. The results will be presented and a possible substitution of the materials to stabilize fly ash will be discussed.
只有通过评估旨在优化资源利用的流程，才能实现可持续经济。由于垃圾焚烧发电工艺，垃圾可成为一种重要的能源来源。通过将有毒飞灰转化为回收材料等资源，可解决对其的担忧。回收利用的承诺源于保护自然资源、减少原材料进口、节省填埋空间和减少污染的需求。得益于COSMOS-RICE LIFE+项目（www.cosmos-rice.csmt.eu），已开发出一种在室温下稳定城市固体废弃物焚烧炉（MSWI）飞灰的新方法。该工艺基于一种化学反应，即通过将三种废弃飞灰与稻壳灰（一种农业副产品）适当混合而发生。COSMOS惰性材料可替代关键原材料（如二氧化硅、萤石、粘土、膨润土、锑和氧化铝）作为填料。此外，稳定化程序中使用的材料并非在所有地区都有。本文研究了用相应的硅灰石替代硅灰以及用低成本氢氧化钙粉末替代烟气脱硫（FGD）残渣的可能性。同时也考虑了去除煤飞灰的问题。将展示结果并讨论稳定飞灰材料的可能替代方案。
