Clean up of acidic leachates using fly ash barriers: Laboratory column studiesView Crossref metadata(active tab) <div id="edit-xml" class="form-item form-type-item"> <?xml version="1.0"?> <doi_batch version="4.4.1" xmlns="http://www.crossref.org/schema/4.4.1" xmlns:jats="http://www.ncbi.nlm.nih.gov/JATS1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.crossref.org/schema/4.4.1 http://www.crossref.org/schemas/crossref4.4.1.xsd"><head><doi_batch_id>000696</doi_batch_id><timestamp>1714041850</timestamp><depositor><depositor_name>University of the Aegean</depositor_name><email_address>uoa@university.com</email_address></depositor><registrant>Global NEST Journal</registrant></head><body><journal><journal_metadata><full_title>Global NEST Journal</full_title><full_title>Global NEST: the international Journal</full_title><issn media_type="print">1790-7632</issn><issn media_type="electronic">2241-777X</issn></journal_metadata><journal_issue><titles><title>Issue 1</title></titles><publication_date><month>03</month><year>2024</year></publication_date><journal_volume><volume>6</volume></journal_volume><issue>1</issue></journal_issue><journal_article><titles><title>Clean up of acidic leachates using fly ash barriers: Laboratory column studies</title></titles><abstract xmlns="http://www.ncbi.nlm.nih.gov/JATS1"><p>Laboratory column tests were conducted to study the efficiency of lignite fly ash barriers in removing heavy metal ions, such as Fe, Zn, Mn, Ni, Cd, Co, Al and Cu, present in high concentrations in acidic leachates produced in mining and waste disposal sites. The experimental configuration comprised two 40 cm long plexiglas continuous flow columns installed in series. An upward flow of synthetic acidic solutions spiked with high concentrations of contaminants was maintained in order to simulate field flow rates and residence times. Sampling ports fitted along the column walls allowed sampling and provided information on geochemical mechanisms within the barrier and contaminant degradation rates in the presence of the reactive material. The geochemical speciation/mass transfer computer code PHREEQC and the MINTEQ database were used for geochemical modeling of the process. The experimental results underline the potential of lignite fly ash permeable reactive barriers to remove almost completely, over a long period, high loads of inorganic contaminants from very acidic leachates. The main mechanisms involved in contaminants removal are adsorption at the surface of fly ash and the produced hydrous iron oxides, precipitation and co-precipitation. The toxicity of the reactive material at the end of the treatment period, regarding all heavy metals studied, is limited.</p></abstract><publication_date><month>04</month><day>29</day><year>2013</year></publication_date><pages><first_page>81</first_page><last_page>89</last_page></pages><publisher_item><identifier id_type="pii">252</identifier></publisher_item><doi_data><doi>10.30955/gnj.000252</doi><timestamp>1714041850</timestamp><resource>https://journal.gnest.org/publication/252</resource></doi_data></journal_article></journal></body></doi_batch> </div>
