Treatment of metals-contaminated wastewaters by use of natural zeolites
This paper assesses the potential of natural zeolite utilization as a low-cost in exchange material for heavy metals removal. Two natural zeolites, clinoptilohte and chabazite, have been evaluated with respect to their selectivity and removal performance for the treatment of effluents contaminated w...
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| Veröffentlicht in: | Water science and technology 1999, Vol.39 (10-11), p.115-122 |
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| creator | Ouki, S.K. Kavannagh, M. |
| description | This paper assesses the potential of natural zeolite utilization as a low-cost in exchange material for heavy metals removal. Two natural zeolites, clinoptilohte and chabazite, have been evaluated with respect to their selectivity and removal performance for the treatment of effluents contaminated with mixed heavy metals (Pb, Cd, Cu, Zn, Cr, Ni and Co). The effects of relevant parameters such as chemical treatment, metals concentration, pH, and presence of competing ions were examined. The results showed that the received zeolites contained exchangeable K, Ca and Na ions, but exposing them to concentrated NaCl solutions converted them to a homoionic state in the Na form which improved their exchange capacity. Chnoptilolite and chabazite exhibited different selectivity profiles for all metals studied except for Pb for which both zeolites performed exceptionally well.
The results also showed that chabazite exchange capacity is superior to that of clinoptilohte mainly due to the higher Al substitution of Si which provides chabazite with a negative framework favourable to higher exchange capability. The pH was found to have an effect on metal removal as it can influence both the character of the exchanging ions and the zeolite itself. Overall, the removal mechanism was controlled by ion exchange and precipitation was proven negligible. |
| doi_str_mv | 10.1016/S0273-1223(99)00260-7 |
| format | Article |
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The results also showed that chabazite exchange capacity is superior to that of clinoptilohte mainly due to the higher Al substitution of Si which provides chabazite with a negative framework favourable to higher exchange capability. The pH was found to have an effect on metal removal as it can influence both the character of the exchanging ions and the zeolite itself. Overall, the removal mechanism was controlled by ion exchange and precipitation was proven negligible.</description><identifier>ISSN: 0273-1223</identifier><identifier>ISBN: 0080428185</identifier><identifier>ISBN: 9780080428185</identifier><identifier>EISSN: 1996-9732</identifier><identifier>DOI: 10.1016/S0273-1223(99)00260-7</identifier><identifier>CODEN: WSTED4</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Aluminum ; Applied sciences ; Cadmium ; Calcium ; Capacity ; Chemical treatment ; Chromium ; Clinoptilolite zeolites ; Copper ; Effluent treatment ; Effluents ; Exact sciences and technology ; Exchange capacity ; Frameworks ; Heavy metals ; Industrial wastewaters ; ion exchange ; Ions ; Lead ; Metal concentrations ; Metals ; Natural zeolites ; Nickel ; pH effects ; Pollution ; Profiles ; Removal ; removal efficiency ; Selectivity ; Sodium chloride ; Solutions ; Wastewater pollution ; Wastewaters ; Water treatment and pollution ; Zeolites ; Zinc</subject><ispartof>Water science and technology, 1999, Vol.39 (10-11), p.115-122</ispartof><rights>1999 International Association on Water Quality</rights><rights>1999 INIST-CNRS</rights><rights>Copyright IWA Publishing May 1999</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a457t-1da75229ca5d6e978386cbb1ff66e29da8aca049df5caa9cc2cba8853956b56b3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>309,310,314,780,784,789,790,4021,4047,4048,23928,23929,25138,27921,27922,27923</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1824372$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><contributor>Nyholm, N (eds)</contributor><contributor>Englande, AJ Jr</contributor><creatorcontrib>Ouki, S.K.</creatorcontrib><creatorcontrib>Kavannagh, M.</creatorcontrib><title>Treatment of metals-contaminated wastewaters by use of natural zeolites</title><title>Water science and technology</title><description>This paper assesses the potential of natural zeolite utilization as a low-cost in exchange material for heavy metals removal. Two natural zeolites, clinoptilohte and chabazite, have been evaluated with respect to their selectivity and removal performance for the treatment of effluents contaminated with mixed heavy metals (Pb, Cd, Cu, Zn, Cr, Ni and Co). The effects of relevant parameters such as chemical treatment, metals concentration, pH, and presence of competing ions were examined. The results showed that the received zeolites contained exchangeable K, Ca and Na ions, but exposing them to concentrated NaCl solutions converted them to a homoionic state in the Na form which improved their exchange capacity. Chnoptilolite and chabazite exhibited different selectivity profiles for all metals studied except for Pb for which both zeolites performed exceptionally well.
The results also showed that chabazite exchange capacity is superior to that of clinoptilohte mainly due to the higher Al substitution of Si which provides chabazite with a negative framework favourable to higher exchange capability. The pH was found to have an effect on metal removal as it can influence both the character of the exchanging ions and the zeolite itself. Overall, the removal mechanism was controlled by ion exchange and precipitation was proven negligible.</description><subject>Aluminum</subject><subject>Applied sciences</subject><subject>Cadmium</subject><subject>Calcium</subject><subject>Capacity</subject><subject>Chemical treatment</subject><subject>Chromium</subject><subject>Clinoptilolite zeolites</subject><subject>Copper</subject><subject>Effluent treatment</subject><subject>Effluents</subject><subject>Exact sciences and technology</subject><subject>Exchange capacity</subject><subject>Frameworks</subject><subject>Heavy metals</subject><subject>Industrial wastewaters</subject><subject>ion exchange</subject><subject>Ions</subject><subject>Lead</subject><subject>Metal concentrations</subject><subject>Metals</subject><subject>Natural zeolites</subject><subject>Nickel</subject><subject>pH effects</subject><subject>Pollution</subject><subject>Profiles</subject><subject>Removal</subject><subject>removal efficiency</subject><subject>Selectivity</subject><subject>Sodium chloride</subject><subject>Solutions</subject><subject>Wastewater pollution</subject><subject>Wastewaters</subject><subject>Water treatment and pollution</subject><subject>Zeolites</subject><subject>Zinc</subject><issn>0273-1223</issn><issn>1996-9732</issn><isbn>0080428185</isbn><isbn>9780080428185</isbn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqN0ltrFTEQAODgBTyt_gRhQZH6sDX3y5NIaatQ6IP1OcxmZyFlLzXJtrS_3pyeouDLKQQSyDczITOEvGf0mFGmv_yk3IiWcS6OnPtMKde0NS_IhjmnW2cEf0kOKLVUcsusekU2f_0bcpDzNaXUCEk35PwqIZQJ59IsQzNhgTG3YZkLTHGGgn1zB7ngXT2m3HT3zZpxK-vdmmBsHnAZY8H8lrweaii-e9oPya-z06uT7-3F5fmPk28XLUhlSst6MIpzF0D1Gp2xwurQdWwYtEbuerAQgErXDyoAuBB46MBaJZzSXV3ikHza5b1Jy-8Vc_FTzAHHEWZc1uy5c0oqKZ4BDZdcur2QGW0Nt_oZUNSHSrUfSsUM1dvSH_6D18ua5vp_njkpJGNU2qrUToW05Jxw8DcpTpDuPaN-Ow3-cRr8trveOf84Dd7UuI9P2SEHGIcEc4j5X7DlUhhe2dcdw9q224jJ5xBxDtjHhKH4fol7Cv0BCJzFtA</recordid><startdate>1999</startdate><enddate>1999</enddate><creator>Ouki, 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of metals-contaminated wastewaters by use of natural zeolites</title><author>Ouki, S.K. ; Kavannagh, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a457t-1da75229ca5d6e978386cbb1ff66e29da8aca049df5caa9cc2cba8853956b56b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Aluminum</topic><topic>Applied sciences</topic><topic>Cadmium</topic><topic>Calcium</topic><topic>Capacity</topic><topic>Chemical treatment</topic><topic>Chromium</topic><topic>Clinoptilolite zeolites</topic><topic>Copper</topic><topic>Effluent treatment</topic><topic>Effluents</topic><topic>Exact sciences and technology</topic><topic>Exchange capacity</topic><topic>Frameworks</topic><topic>Heavy metals</topic><topic>Industrial wastewaters</topic><topic>ion exchange</topic><topic>Ions</topic><topic>Lead</topic><topic>Metal concentrations</topic><topic>Metals</topic><topic>Natural zeolites</topic><topic>Nickel</topic><topic>pH effects</topic><topic>Pollution</topic><topic>Profiles</topic><topic>Removal</topic><topic>removal efficiency</topic><topic>Selectivity</topic><topic>Sodium chloride</topic><topic>Solutions</topic><topic>Wastewater pollution</topic><topic>Wastewaters</topic><topic>Water treatment and pollution</topic><topic>Zeolites</topic><topic>Zinc</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ouki, S.K.</creatorcontrib><creatorcontrib>Kavannagh, M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Aqualine</collection><collection>Water Resources Abstracts</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest SciTech 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science and technology</jtitle><date>1999</date><risdate>1999</risdate><volume>39</volume><issue>10-11</issue><spage>115</spage><epage>122</epage><pages>115-122</pages><issn>0273-1223</issn><eissn>1996-9732</eissn><isbn>0080428185</isbn><isbn>9780080428185</isbn><coden>WSTED4</coden><abstract>This paper assesses the potential of natural zeolite utilization as a low-cost in exchange material for heavy metals removal. Two natural zeolites, clinoptilohte and chabazite, have been evaluated with respect to their selectivity and removal performance for the treatment of effluents contaminated with mixed heavy metals (Pb, Cd, Cu, Zn, Cr, Ni and Co). The effects of relevant parameters such as chemical treatment, metals concentration, pH, and presence of competing ions were examined. The results showed that the received zeolites contained exchangeable K, Ca and Na ions, but exposing them to concentrated NaCl solutions converted them to a homoionic state in the Na form which improved their exchange capacity. Chnoptilolite and chabazite exhibited different selectivity profiles for all metals studied except for Pb for which both zeolites performed exceptionally well.
The results also showed that chabazite exchange capacity is superior to that of clinoptilohte mainly due to the higher Al substitution of Si which provides chabazite with a negative framework favourable to higher exchange capability. The pH was found to have an effect on metal removal as it can influence both the character of the exchanging ions and the zeolite itself. Overall, the removal mechanism was controlled by ion exchange and precipitation was proven negligible.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0273-1223(99)00260-7</doi><tpages>8</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0273-1223 |
| ispartof | Water science and technology, 1999, Vol.39 (10-11), p.115-122 |
| issn | 0273-1223 1996-9732 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_29954543 |
| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Aluminum Applied sciences Cadmium Calcium Capacity Chemical treatment Chromium Clinoptilolite zeolites Copper Effluent treatment Effluents Exact sciences and technology Exchange capacity Frameworks Heavy metals Industrial wastewaters ion exchange Ions Lead Metal concentrations Metals Natural zeolites Nickel pH effects Pollution Profiles Removal removal efficiency Selectivity Sodium chloride Solutions Wastewater pollution Wastewaters Water treatment and pollution Zeolites Zinc |
| title | Treatment of metals-contaminated wastewaters by use of natural zeolites |
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