Ettringite and monosulfate formation to reduce alkalinity in reactions of alum-based water treatment residual with steel slag
•Steel slag can create highly alkaline leachates detrimental to aquatic life.•Degree of alkalinity mitigation was proportional to the reductions in Ca release.•Water treatment residual addition to steel slag mitigated alkalinity.•Ettringite and monosulfate formation can explain the reduced Ca(II) an...
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| Veröffentlicht in: | Waste management (Elmsford) 2019-02, Vol.84, p.1-12 |
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| creator | Özkök, Enes Davis, Allen P. Aydilek, Ahmet H. |
| description | •Steel slag can create highly alkaline leachates detrimental to aquatic life.•Degree of alkalinity mitigation was proportional to the reductions in Ca release.•Water treatment residual addition to steel slag mitigated alkalinity.•Ettringite and monosulfate formation can explain the reduced Ca(II) and OH− release.
Aged steel slag has a potential use as a highly durable aggregate in roadway construction; however, its high capacity for creating alkaline leachates (pH > 12.4) poses a severe environmental risk. In batch and column leach tests, 10% alum-based water treatment residual (WTR) addition to aged steel slag resulted in a 67% decrease in acid neutralizing capacity of steel slag and leachate alkalinity, but this alkalinity mitigation effect was accompanied with markedly increases in dissolved Al concentrations in the leachates ( |
| doi_str_mv | 10.1016/j.wasman.2018.11.018 |
| format | Article |
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Aged steel slag has a potential use as a highly durable aggregate in roadway construction; however, its high capacity for creating alkaline leachates (pH > 12.4) poses a severe environmental risk. In batch and column leach tests, 10% alum-based water treatment residual (WTR) addition to aged steel slag resulted in a 67% decrease in acid neutralizing capacity of steel slag and leachate alkalinity, but this alkalinity mitigation effect was accompanied with markedly increases in dissolved Al concentrations in the leachates (<4.6 mM) compared to steel slag-only samples. Measurements of dissolved ions, saturation index evaluations, and results of geochemical modeling analysis indicated that ettringite and monosulfate formations were favored and that it is probably the responsible mechanism for the observed mitigation of alkalinity and Ca release under alkaline conditions.</description><identifier>ISSN: 0956-053X</identifier><identifier>EISSN: 1879-2456</identifier><identifier>DOI: 10.1016/j.wasman.2018.11.018</identifier><identifier>PMID: 30691880</identifier><language>eng</language><publisher>United States: Elsevier Ltd</publisher><subject>Alkalinity ; Alum Compounds ; Basic oxygen furnace steel slag ; Ettringite ; Industrial Waste ; Minerals ; Monosulfate ; Steel ; Water Pollutants, Chemical ; Water Purification ; Water treatment residual</subject><ispartof>Waste management (Elmsford), 2019-02, Vol.84, p.1-12</ispartof><rights>2018 Elsevier Ltd</rights><rights>Copyright © 2018 Elsevier Ltd. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c399t-6215c992af3fa98ebcb5b4a685511fa0f7ce49ef126147b9aa46ab5579d9e03f3</citedby><cites>FETCH-LOGICAL-c399t-6215c992af3fa98ebcb5b4a685511fa0f7ce49ef126147b9aa46ab5579d9e03f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.wasman.2018.11.018$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27926,27927,45997</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/30691880$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Özkök, Enes</creatorcontrib><creatorcontrib>Davis, Allen P.</creatorcontrib><creatorcontrib>Aydilek, Ahmet H.</creatorcontrib><title>Ettringite and monosulfate formation to reduce alkalinity in reactions of alum-based water treatment residual with steel slag</title><title>Waste management (Elmsford)</title><addtitle>Waste Manag</addtitle><description>•Steel slag can create highly alkaline leachates detrimental to aquatic life.•Degree of alkalinity mitigation was proportional to the reductions in Ca release.•Water treatment residual addition to steel slag mitigated alkalinity.•Ettringite and monosulfate formation can explain the reduced Ca(II) and OH− release.
Aged steel slag has a potential use as a highly durable aggregate in roadway construction; however, its high capacity for creating alkaline leachates (pH > 12.4) poses a severe environmental risk. In batch and column leach tests, 10% alum-based water treatment residual (WTR) addition to aged steel slag resulted in a 67% decrease in acid neutralizing capacity of steel slag and leachate alkalinity, but this alkalinity mitigation effect was accompanied with markedly increases in dissolved Al concentrations in the leachates (<4.6 mM) compared to steel slag-only samples. Measurements of dissolved ions, saturation index evaluations, and results of geochemical modeling analysis indicated that ettringite and monosulfate formations were favored and that it is probably the responsible mechanism for the observed mitigation of alkalinity and Ca release under alkaline conditions.</description><subject>Alkalinity</subject><subject>Alum Compounds</subject><subject>Basic oxygen furnace steel slag</subject><subject>Ettringite</subject><subject>Industrial Waste</subject><subject>Minerals</subject><subject>Monosulfate</subject><subject>Steel</subject><subject>Water Pollutants, Chemical</subject><subject>Water Purification</subject><subject>Water treatment residual</subject><issn>0956-053X</issn><issn>1879-2456</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kEFv1DAQhS0EokvhHyDkI5cETxIn8QUJVW1BqsSFSr1ZE2dcvCR2sR1WPfDf8WoLR05PM_O9Gc1j7C2IGgT0H_b1AdOKvm4EjDVAXeQZ28E4qKrpZP-c7YSSfSVke3fGXqW0FwK6EcRLdtaKXsE4ih37fZlzdP7eZeLoZ74GH9K2WCy1DXHF7ILnOfBI82YKs_zAxXmXH7nzpYnmCCQebBltazVhopkfij3yXMZ5JZ8Ll9y84cIPLn_nKRMtPC14_5q9sLgkevOk5-z26vLbxefq5uv1l4tPN5VplcpV34A0SjVoW4tqpMlMcuqwH6UEsCjsYKhTZKHpoRsmhdj1OEk5qFmRaG17zt6f9j7E8HOjlPXqkqFlQU9hS7qBQXVd24IoaHdCTQwpRbL6IboV46MGoY_B670-Ba-PwWsAXaTY3j1d2KaV5n-mv0kX4OMJoPLnL0dRJ-PIG5pdJJP1HNz_L_wBj3WZmA</recordid><startdate>20190201</startdate><enddate>20190201</enddate><creator>Özkök, Enes</creator><creator>Davis, Allen P.</creator><creator>Aydilek, Ahmet H.</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20190201</creationdate><title>Ettringite and monosulfate formation to reduce alkalinity in reactions of alum-based water treatment residual with steel slag</title><author>Özkök, Enes ; Davis, Allen P. ; Aydilek, Ahmet H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c399t-6215c992af3fa98ebcb5b4a685511fa0f7ce49ef126147b9aa46ab5579d9e03f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Alkalinity</topic><topic>Alum Compounds</topic><topic>Basic oxygen furnace steel slag</topic><topic>Ettringite</topic><topic>Industrial Waste</topic><topic>Minerals</topic><topic>Monosulfate</topic><topic>Steel</topic><topic>Water Pollutants, Chemical</topic><topic>Water Purification</topic><topic>Water treatment residual</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Özkök, Enes</creatorcontrib><creatorcontrib>Davis, Allen P.</creatorcontrib><creatorcontrib>Aydilek, Ahmet H.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Waste management (Elmsford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Özkök, Enes</au><au>Davis, Allen P.</au><au>Aydilek, Ahmet H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ettringite and monosulfate formation to reduce alkalinity in reactions of alum-based water treatment residual with steel slag</atitle><jtitle>Waste management (Elmsford)</jtitle><addtitle>Waste Manag</addtitle><date>2019-02-01</date><risdate>2019</risdate><volume>84</volume><spage>1</spage><epage>12</epage><pages>1-12</pages><issn>0956-053X</issn><eissn>1879-2456</eissn><abstract>•Steel slag can create highly alkaline leachates detrimental to aquatic life.•Degree of alkalinity mitigation was proportional to the reductions in Ca release.•Water treatment residual addition to steel slag mitigated alkalinity.•Ettringite and monosulfate formation can explain the reduced Ca(II) and OH− release.
Aged steel slag has a potential use as a highly durable aggregate in roadway construction; however, its high capacity for creating alkaline leachates (pH > 12.4) poses a severe environmental risk. In batch and column leach tests, 10% alum-based water treatment residual (WTR) addition to aged steel slag resulted in a 67% decrease in acid neutralizing capacity of steel slag and leachate alkalinity, but this alkalinity mitigation effect was accompanied with markedly increases in dissolved Al concentrations in the leachates (<4.6 mM) compared to steel slag-only samples. Measurements of dissolved ions, saturation index evaluations, and results of geochemical modeling analysis indicated that ettringite and monosulfate formations were favored and that it is probably the responsible mechanism for the observed mitigation of alkalinity and Ca release under alkaline conditions.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><pmid>30691880</pmid><doi>10.1016/j.wasman.2018.11.018</doi><tpages>12</tpages></addata></record> |
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| ispartof | Waste management (Elmsford), 2019-02, Vol.84, p.1-12 |
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| language | eng |
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| source | MEDLINE; Access via ScienceDirect (Elsevier) |
| subjects | Alkalinity Alum Compounds Basic oxygen furnace steel slag Ettringite Industrial Waste Minerals Monosulfate Steel Water Pollutants, Chemical Water Purification Water treatment residual |
| title | Ettringite and monosulfate formation to reduce alkalinity in reactions of alum-based water treatment residual with steel slag |
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