Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water
Groundwater contamination with arsenic (As) has been recognized as a serious problem and there are various reports from different regions, especially from Kurdistan Providence, indicating the presence of As in the from of arsenate and arsenite in water recourses. Removal of these compounds can be ac...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Water and Wastewater Consulting Engineers Research Development
2009-09-01
|
| Series: | آب و فاضلاب |
| Subjects: | |
| Online Access: | http://www.wwjournal.ir/article_1634_6e36e2fc25ff0e29634a37eb94648a53.pdf |
| _version_ | 1819275679650283520 |
|---|---|
| author | AliReza Asgari Simin Nasseri Amir Hossein Mahvi Aghdas Kheiri Azar Qasri Forough Vaezi |
| author_facet | AliReza Asgari Simin Nasseri Amir Hossein Mahvi Aghdas Kheiri Azar Qasri Forough Vaezi |
| author_sort | AliReza Asgari |
| collection | DOAJ |
| description | Groundwater contamination with arsenic (As) has been recognized as a serious problem and there are various reports from different regions, especially from Kurdistan Providence, indicating the presence of As in the from of arsenate and arsenite in water recourses. Removal of these compounds can be accomplished by various methods but they are all expensive. In this study, three concentrations (0.5, 1, and 1 mg/L) of iron filings (0.25, 0.5, 1 and 1.5 grams) were used as a cheap and available material for adsorption of As and the effects of contact time and pH as well as chloride and sulfate ion concentrations on removal efficiency were determined. Description of adsorption isotherms (Ferundlich and Langmuir) was accomplished. Finally, the data obtained were analyzed using the Excel softwere. The results indicate that iron filings show a high capability in adsorbing both arsenate and arsenic compounds from polluted water samples at pH 7 over a short contact time of 30 minutes. In fact, this cheap adsorbent shows good treatment when used at doses as low as 1g/L with no considerable interference by interfering anions (SO42- and Cl-). It appears that the absorbability of both arsenate and arsenite by iron filings can be expressed by Ferundlich isotherm with R2>0.96, whereas arsenate adsorption (with a R2 value of more than 0.96) can be better described by Langmuir isotherm than arsenite (with R2 value of more than 0.91). Results also indicate that the amount of iron added to water is much more than the standard value of 0.3mg/L set for dinking water. Nevertheless, this method has far greater advantages in terms of costs and availability than similar methods. Besides, as removal by this method is efficient without pH modification, iron filing treatment of drinking water may, therefore, be recomnended as a convenient solution to the problem of water resources polluted with As in Iran. |
| first_indexed | 2024-12-23T23:28:10Z |
| format | Article |
| id | doaj.art-d29fdd3ebc7a4b0a8cca98695ace3940 |
| institution | Directory Open Access Journal |
| issn | 1024-5936 2383-0905 |
| language | English |
| last_indexed | 2024-12-23T23:28:10Z |
| publishDate | 2009-09-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
| record_format | Article |
| series | آب و فاضلاب |
| spelling | doaj.art-d29fdd3ebc7a4b0a8cca98695ace39402022-12-21T17:26:10ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052009-09-0120318251634Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking WaterAliReza Asgari0Simin Nasseri1Amir Hossein Mahvi2Aghdas Kheiri3Azar Qasri4Forough Vaezi5M.Sc., Faculty of Health, Shahroud University of Medical SciencesProf., Faculty of Health, Tehran University of Medical SciencesAssist. Prof., Faculty of Health, Tehran University of Medical SciencesEnvironmental health Expert, Faculty of Health, Tehran University of Medical SciencesEnvironmental health Expert, Faculty of Health, Tehran University of Medical SciencesAssoc. Prof., Faculty of Health, Tehran University of Medical SciencesGroundwater contamination with arsenic (As) has been recognized as a serious problem and there are various reports from different regions, especially from Kurdistan Providence, indicating the presence of As in the from of arsenate and arsenite in water recourses. Removal of these compounds can be accomplished by various methods but they are all expensive. In this study, three concentrations (0.5, 1, and 1 mg/L) of iron filings (0.25, 0.5, 1 and 1.5 grams) were used as a cheap and available material for adsorption of As and the effects of contact time and pH as well as chloride and sulfate ion concentrations on removal efficiency were determined. Description of adsorption isotherms (Ferundlich and Langmuir) was accomplished. Finally, the data obtained were analyzed using the Excel softwere. The results indicate that iron filings show a high capability in adsorbing both arsenate and arsenic compounds from polluted water samples at pH 7 over a short contact time of 30 minutes. In fact, this cheap adsorbent shows good treatment when used at doses as low as 1g/L with no considerable interference by interfering anions (SO42- and Cl-). It appears that the absorbability of both arsenate and arsenite by iron filings can be expressed by Ferundlich isotherm with R2>0.96, whereas arsenate adsorption (with a R2 value of more than 0.96) can be better described by Langmuir isotherm than arsenite (with R2 value of more than 0.91). Results also indicate that the amount of iron added to water is much more than the standard value of 0.3mg/L set for dinking water. Nevertheless, this method has far greater advantages in terms of costs and availability than similar methods. Besides, as removal by this method is efficient without pH modification, iron filing treatment of drinking water may, therefore, be recomnended as a convenient solution to the problem of water resources polluted with As in Iran.http://www.wwjournal.ir/article_1634_6e36e2fc25ff0e29634a37eb94648a53.pdfArsenateArseniteIron FilingsAdsorption ProcessDrinking water |
| spellingShingle | AliReza Asgari Simin Nasseri Amir Hossein Mahvi Aghdas Kheiri Azar Qasri Forough Vaezi Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water آب و فاضلاب Arsenate Arsenite Iron Filings Adsorption Process Drinking water |
| title | Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water |
| title_full | Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water |
| title_fullStr | Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water |
| title_full_unstemmed | Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water |
| title_short | Effectiveness of Iron Filings in Arsenate and Arsenite Removal from Drinking Water |
| title_sort | effectiveness of iron filings in arsenate and arsenite removal from drinking water |
| topic | Arsenate Arsenite Iron Filings Adsorption Process Drinking water |
| url | http://www.wwjournal.ir/article_1634_6e36e2fc25ff0e29634a37eb94648a53.pdf |
| work_keys_str_mv | AT alirezaasgari effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater AT siminnasseri effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater AT amirhosseinmahvi effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater AT aghdaskheiri effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater AT azarqasri effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater AT foroughvaezi effectivenessofironfilingsinarsenateandarseniteremovalfromdrinkingwater |