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Materials 2015, 8(10), 6868-6879; doi:10.3390/ma8105346

Rice Husk Ash to Stabilize Heavy Metals Contained in Municipal Solid Waste Incineration Fly Ash: First Results by Applying New Pre-treatment Technology

1
INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, Brescia 25123, Italy
2
Contento Trade srl, Via Vieris 11, Terenzano (UD) 33050, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Marco Morreale
Received: 26 August 2015 / Revised: 25 September 2015 / Accepted: 29 September 2015 / Published: 9 October 2015
(This article belongs to the Special Issue Green Composites)
View Full-Text   |   Download PDF [2669 KB, uploaded 9 October 2015]   |  

Abstract

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. View Full-Text
Keywords: fly ash; rice husk ash; DIC; heavy metals stabilization; COSMOS-RICE fly ash; rice husk ash; DIC; heavy metals stabilization; COSMOS-RICE
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Benassi, L.; Franchi, F.; Catina, D.; Cioffi, F.; Rodella, N.; Borgese, L.; Pasquali, M.; Depero, L.E.; Bontempi, E. Rice Husk Ash to Stabilize Heavy Metals Contained in Municipal Solid Waste Incineration Fly Ash: First Results by Applying New Pre-treatment Technology. Materials 2015, 8, 6868-6879.

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