Benassi Laura, Franchi Federica, Catina Daniele, Cioffi Flavio, Rodella Nicola, Borgese Laura, Pasquali Michela, Depero Laura E, Bontempi Elza
INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, Brescia 25123, Italy.
Contento Trade srl, Via Vieris 11, Terenzano (UD) 33050, Italy.
Materials (Basel). 2015 Oct 9;8(10):6868-6879. doi: 10.3390/ma8105346.
A new technology was recently developed for municipal solid waste incineration (MSWI) fly ash stabilization, based on the employment of all waste and byproduct materials. In particular, the proposed method is based on the use of amorphous silica contained in rice husk ash (RHA), an agricultural byproduct material (COSMOS-RICE project). The obtained final inert can be applied in several applications to produce "green composites". In this work, for the first time, a process for pre-treatment of rice husk, before its use in the stabilization of heavy metals, based on the employment of Instant Pressure Drop technology (DIC) was tested. The aim of this work is to verify the influence of the pre-treatment on the efficiency on heavy metals stabilization in the COSMOS-RICE technology. DIC technique is based on a thermomechanical effect induced by an abrupt transition from high steam pressure to a vacuum, to produce changes in the material. Two different DIC pre-treatments were selected and thermal annealing at different temperatures were performed on rice husk. The resulting RHAs were employed to obtain COSMOS-RICE samples, and the stabilization procedure was tested on the MSWI fly ash. In the frame of this work, some thermal treatments were also realized in O2-limiting conditions, to test the effect of charcoal obtained from RHA on the stabilization procedure. The results of this work show that the application of DIC technology into existing treatment cycles of some waste materials should be investigated in more details to offer the possibility to stabilize and reuse waste.
最近开发了一种基于使用所有废弃物和副产品材料的城市固体废物焚烧（MSWI）飞灰稳定化新技术。具体而言，所提出的方法基于使用稻壳灰（RHA）中含有的无定形二氧化硅，稻壳灰是一种农业副产品材料（COSMOS - RICE项目）。所获得的最终惰性产物可应用于多种用途以生产“绿色复合材料”。在这项工作中，首次测试了一种基于瞬间压降技术（DIC）的稻壳预处理工艺，该工艺用于在稻壳用于稳定重金属之前。这项工作的目的是验证预处理对COSMOS - RICE技术中重金属稳定化效率的影响。DIC技术基于由高蒸汽压力突然转变为真空所引起的热机械效应，从而使材料发生变化。选择了两种不同的DIC预处理方法，并对稻壳进行了不同温度的热退火处理。将所得的稻壳灰用于制备COSMOS - RICE样品，并在MSWI飞灰上测试稳定化程序。在这项工作的框架内，还在限氧条件下进行了一些热处理，以测试从稻壳灰中获得的木炭对稳定化程序的影响。这项工作的结果表明，应更详细地研究将DIC技术应用于某些废料的现有处理循环中，以便为稳定和再利用废料提供可能性。
