Long-term monitoring of Mn and Fe removal in biofilters from a converted plant
Conversion from physicochemical to biological treatment in water treatment plants has received increased attention due to the potential benefits of biofiltration. However, information is limited about the operational performance of converted water treatment plants for iron (Fe) and manganese (Mn) re...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-06-01
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| Series: | Water Supply |
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| Online Access: | http://ws.iwaponline.com/content/22/6/6059 |
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| author | José A. Araya-Obando Virginia Pacini Rubén G. Fernández Luis G. Romero-Esquivel |
| author_facet | José A. Araya-Obando Virginia Pacini Rubén G. Fernández Luis G. Romero-Esquivel |
| author_sort | José A. Araya-Obando |
| collection | DOAJ |
| description | Conversion from physicochemical to biological treatment in water treatment plants has received increased attention due to the potential benefits of biofiltration. However, information is limited about the operational performance of converted water treatment plants for iron (Fe) and manganese (Mn) removal over a long-term period. In this study, Fe and Mn removal from biofilters was investigated in a converted plant from November 2011 until April 2021. The plant comprises an aeration unit followed by a modified up-flow roughing filter (URF) and by two rapid sand filters (RSF) in parallel. Data analysis was based on Fe and Mn concentrations collected from 222 water analysis reports. Results showed that 98% of Fe and 95% of Mn concentrations in treated water were below the local regulatory limits of Fe < 0.2 mg/L and Mn < 0.1 mg/L. Fe was mainly removed in the URF (68%), and Mn was removed nearly equally by the URF (46%) and the RSF (47%). The combination of the URF with RSF produced total Fe and Mn removal efficiencies of 95% and 88%, respectively. No significant differences between the seasonal variation of Fe and Mn concentrations in the URG and RSF were found. The effectiveness of biofiltration technology without the use of chemical reagents or nutrient substrate additions, was demonstrated over a long-term period of monitoring. HIGHLIGHTS
The effectiveness of biofiltration technology in a converted WTP during 114 months was demonstrated.;
The combination of the URF with RSF produced total Fe and Mn removal efficiencies of 95% and 88%, respectively.;
98% of Fe and 95% of Mn concentrations in treated water were below the local regulation.;
The performance of Las Toscas WTP was mainly influenced by Fe loading fluctuations in the feed water.; |
| first_indexed | 2024-12-10T17:09:50Z |
| format | Article |
| id | doaj.art-783d76b895184a2f9666217e3669dba6 |
| institution | Directory Open Access Journal |
| issn | 1606-9749 1607-0798 |
| language | English |
| last_indexed | 2024-12-10T17:09:50Z |
| publishDate | 2022-06-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Supply |
| spelling | doaj.art-783d76b895184a2f9666217e3669dba62022-12-22T01:40:21ZengIWA PublishingWater Supply1606-97491607-07982022-06-012266059606910.2166/ws.2022.209209Long-term monitoring of Mn and Fe removal in biofilters from a converted plantJosé A. Araya-Obando0Virginia Pacini1Rubén G. Fernández2Luis G. Romero-Esquivel3 Centro de Investigación en Vivienda y Construcción (CIVCO), Escuela Ingeniería en Construcción, Tecnológico de Costa Rica Cartago, Costa Rica Centro de Ingeniería Sanitaria (CIS), Universidad Nacional de Rosario, Rosario, Argentina Centro de Ingeniería Sanitaria (CIS), Universidad Nacional de Rosario, Rosario, Argentina Environmental Protection Research Center (CIPA), School of Chemistry, Tecnológico de Costa Rica Cartago, Costa Rica Conversion from physicochemical to biological treatment in water treatment plants has received increased attention due to the potential benefits of biofiltration. However, information is limited about the operational performance of converted water treatment plants for iron (Fe) and manganese (Mn) removal over a long-term period. In this study, Fe and Mn removal from biofilters was investigated in a converted plant from November 2011 until April 2021. The plant comprises an aeration unit followed by a modified up-flow roughing filter (URF) and by two rapid sand filters (RSF) in parallel. Data analysis was based on Fe and Mn concentrations collected from 222 water analysis reports. Results showed that 98% of Fe and 95% of Mn concentrations in treated water were below the local regulatory limits of Fe < 0.2 mg/L and Mn < 0.1 mg/L. Fe was mainly removed in the URF (68%), and Mn was removed nearly equally by the URF (46%) and the RSF (47%). The combination of the URF with RSF produced total Fe and Mn removal efficiencies of 95% and 88%, respectively. No significant differences between the seasonal variation of Fe and Mn concentrations in the URG and RSF were found. The effectiveness of biofiltration technology without the use of chemical reagents or nutrient substrate additions, was demonstrated over a long-term period of monitoring. HIGHLIGHTS The effectiveness of biofiltration technology in a converted WTP during 114 months was demonstrated.; The combination of the URF with RSF produced total Fe and Mn removal efficiencies of 95% and 88%, respectively.; 98% of Fe and 95% of Mn concentrations in treated water were below the local regulation.; The performance of Las Toscas WTP was mainly influenced by Fe loading fluctuations in the feed water.;http://ws.iwaponline.com/content/22/6/6059biofilter performanceconverted plantgroundwaterironlong-term monitoringmanganese |
| spellingShingle | José A. Araya-Obando Virginia Pacini Rubén G. Fernández Luis G. Romero-Esquivel Long-term monitoring of Mn and Fe removal in biofilters from a converted plant Water Supply biofilter performance converted plant groundwater iron long-term monitoring manganese |
| title | Long-term monitoring of Mn and Fe removal in biofilters from a converted plant |
| title_full | Long-term monitoring of Mn and Fe removal in biofilters from a converted plant |
| title_fullStr | Long-term monitoring of Mn and Fe removal in biofilters from a converted plant |
| title_full_unstemmed | Long-term monitoring of Mn and Fe removal in biofilters from a converted plant |
| title_short | Long-term monitoring of Mn and Fe removal in biofilters from a converted plant |
| title_sort | long term monitoring of mn and fe removal in biofilters from a converted plant |
| topic | biofilter performance converted plant groundwater iron long-term monitoring manganese |
| url | http://ws.iwaponline.com/content/22/6/6059 |
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