Enhancing arsenic removal from groundwater at household level with naturally occurring iron

  • Anitha Kumari Sharma Instituição/Afiliação DTU Environment, Technical University of Denmark, Miljoevej, Building 113, 2800 Kgs., Lyngby, Denmark
  • Sabrina Sorlini Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia
  • Barbara Marianna Crotti A.S.Mare S.r.l., Mortara (Pavia)
  • Maria Cristina Collivignarelli University of Pavia, Pavia, Italy, Department of Civil and Architectural Engineering.
  • Jens Christian Tjell DTU Environment, Technical University of Denmark, Building 113, room 152
  • Alessandro Abbà University of Pavia, Pavia, Italy
Palabras clave: aluminum, metal removal, oxidation

Resumen

A supply of drinking water low in Arsenic (As) prevents arsenic poisoning. The presence of high concentrations of iron (Fe) in groundwater under the alluvial plains of the large rivers in Southeast Asia is a prerequisite for the simple removal of As. This study investigated the mechanisms and possibilities for enhancing As removal with naturally occurring Fe in a reliable, low cost and sustainable way. The results of the study show that As removal with Fe is greatly enhanced by the addition of an oxidizing agent (preferably KMnO4) immediately after the pumping of groundwater. Further enhancement of As removal in the presence of Fe can be achieved by adding a small volume of a concentrated basic solution of MnO4- and AlO2-, which has a combined oxidation, coagulation and buffering capacity. Best results were obtained when this solution was mixed with the groundwater immediately after its pumping until a pale pink color appeared. Maximum required reaction time was 10 minutes and subsequent filtration of the water was able to reduce the As concentration to near zero. Concentrations of MnO4- and AlO2- can be varied in the solution to achieve sufficient As removal to suit different Fe/As ratios and the presence of interfering co-occurring anions.

Biografía del autor/a

Anitha Kumari Sharma, Instituição/Afiliação DTU Environment, Technical University of Denmark, Miljoevej, Building 113, 2800 Kgs., Lyngby, Denmark

DTU Environment, Technical University of Denmark, Miljoevej, Building 113, 2800 Kgs., Lyngby, Denmark.

Sabrina Sorlini, Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia

drinking water (treatments, distribution, specific contaminants removal, etc.), zootechnical manure treatment and biogas reuse; municipal and industrial waste reuse and recovery, appropriate environmental technologies for developing countries.

Barbara Marianna Crotti, A.S.Mare S.r.l., Mortara (Pavia)
Brief description of area of expertise: removal of conventional and non conventional pollutants from drinking water; research on AOPs and electrochemical treatment for liquid wastes.
Maria Cristina Collivignarelli, University of Pavia, Pavia, Italy, Department of Civil and Architectural Engineering.

chemical and biological processes for treatment of industrial wastewater/aqueous wastes, appropriate technologies for drinking water in developing countries.

Jens Christian Tjell, DTU Environment, Technical University of Denmark, Building 113, room 152

Technical University of Denmark Building 113, room 152

Alessandro Abbà, University of Pavia, Pavia, Italy

Laurea in Ingegneria Civile (indirizzo Idraulico) conseguita nel febbraio 2005 presso l’Università degli Studi di Pavia con votazione 107/110. Dottorato di Ricerca in Ingegneria Civile (curriculum sanitario) conseguito il 03/02/2009 presso l’Università degli Studi di Pavia, con una tesi dal titolo “Il recupero dei rifiuti speciali nel settore delle costruzioni: studio delle possibilità di recupero e valutazione dei meccanismi di lisciviazione”. Dal 2009 è Assegnista di Ricerca in Ingegneria Sanitaria presso il Dipartimento di Ingegneria Civile e Architettura (DICAR) dell’Università degli Studi di Pavia. Abilitazione all’esercizio della professione di Ingegnere conseguita nel 2005.

Publicado
23/06/2016
Número
Vol. 11 Núm. 3 (2016)
Sección
Articulos

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