Advanced Search

Journal Navigation

Journal Home

Subscriptions

Archive

Contact Us

Table of Contents

Sign In to gain access to subscriptions and/or personal tools.
Waste Management & Research
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to Saved Citations
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Right arrow Add to My Marked Citations
Citing Articles
Right arrow Citing Articles via Google Scholar
Right arrow Citing Articles via Scopus
Google Scholar
Right arrow Articles by Parapar, J. F. V.
Right arrow Articles by Fernández Pereira, C.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Parapar, J. F. V.
Right arrow Articles by Fernández Pereira, C.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Stabilization/solidification of hazardous metallic wastes: prediction of leach test performance to optimize S/S mixtures

J. F. Vale Parapar

Departamento de Ingenieria Química y Ambiental, Universidad de Sevilla, Sevilla, Spain

C. Ruiz de Elvira Francoy

Departamento de Ingenieria Química y Ambiental, Universidad de Sevilla, Sevilla, Spain

M. Rodríguez-Piñero

Departamento de Ingenieria Química y Ambiental, Universidad de Sevilla, Sevilla, Spain

L. Salvador Martínez

Departamento de Ingenieria Química y Ambiental, Universidad de Sevilla, Sevilla, Spain

C. Fernández Pereira

Departamento de Ingenieria Química y Ambiental, Universidad de Sevilla, Sevilla, Spain

The main tool available for ascertaining the effectiveness attained by a hazardous waste stabilization/solidification (S/S) process is the chemical analysis of the leachate of the solid product obtained. Moreover, it is a well-known fact that the pH of the leachate is the most significant factor in con trolling the leachability of solidified metal bearing wastes, so the lowest concentrations in the leachate of many important metals appear within an optimum range of this pH. In this paper, a methodology is proposed for predicting the final pH of the leachate of different formulations used in the treatment of metallic industrial wastes. This methodology allows us to adjust the proportion of agents used in the S/S processes. In this method, the neutralization curves must first be obtained by acetic acid titration (GANC) of the mixture components. Based on the GANC curves of the components, the alkaline buffer capacity of the S/S solid can be defined and the final pH of the leachate can be predicted. Excellent concordance has been seen between predicted values and test results. How ever, we have also noticed discrepancies for some wastes and S/S agents. These discrepancies can be attributed to internal alkali-consuming reactions that produce lower final leachate pHs than predicted. The methodology proposed helps iden tify the reactions responsible for this process and helps study the evolution over time of the solids obtained.

Key Words: Stabilization/solidification • metallic wastes • hazardous materials • industrial waste treatment • leaching test • leachate pH

Waste Management & Research, Vol. 16, No. 2, 175-182 (1998)
DOI: 10.1177/0734242X9801600209
Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?