Ismael Vera-Puerto , Gianfranco Moris , Hugo Valdés , Marco Quiroz , Francisco Encina , Pascal Molle , Miguel Martín-Monerris , Carmen Hernández-Crespo , Carlos A. Arias
{"title":"Implementation of an experimental vertical flow treatment wetland for combined sewer overflow in the south of Chile","authors":"Ismael Vera-Puerto , Gianfranco Moris , Hugo Valdés , Marco Quiroz , Francisco Encina , Pascal Molle , Miguel Martín-Monerris , Carmen Hernández-Crespo , Carlos A. Arias","doi":"10.1016/j.jwpe.2025.107484","DOIUrl":null,"url":null,"abstract":"<div><div>This work aims to evaluate the performance of Vertical flow (VF) treatment wetlands (TWs) operated in parallel and sequentially for the treatment of combined sewer overflow (CSO) in Chile during the first operative period. An experimental plant was operated at three outflow rates: 0.01 L/(s*m<sup>2</sup>), 0.03 L/(s*m<sup>2</sup>) and 0.05 L/(s*m<sup>2</sup>). Influent and effluent samples from VF TWs were taken every 24 h for a period of 72 h. The water quality parameters that were evaluated included pH, Electrical Conductivity (EC), turbidity (TU), total suspended solids (TSS), 5-day biological oxygen demand (BOD<sub>5</sub>), chemical oxygen demand (COD, total and dissolved), forms of nitrogen (NH<sub>4</sub><sup>+</sup>-N, NO<sub>3</sub><sup>−</sup>-N, TN), total phosphorus (TP), and <em>E. coli</em>. Reductions in pH value below 1.0 and no significant reductions (<em>p</em> > 0.05) on EC were observed in effluents. Furthermore, removals above 75 % for TSS, TU, BOD<sub>5</sub>, and CODt, were stable during the 4-day operational time and for the three outflow rates. In terms of nutrients, similar behavior was observed for the three outflow rates. NH<sub>4</sub><sup>+</sup>-N was effectively removed, without complete transformation into NO<sub>3</sub><sup>−</sup>-N, and TN removal was enhanced after 2-day of operation. TP removal was above 60 % and related to Ca-content in sand used in the wetland bed. Significantly improved results were achieved at 0.03 L/(s*m<sup>2</sup>). However, <em>E. coli</em> showed low removals of 1 log-unit across the three outflow rates, necessitating an effluent disinfection system. Hence, the system based on VF TWs with parallel operation and sequential feeding, is a promising technology for CSO treatment in the Chilean context.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"72 ","pages":"Article 107484"},"PeriodicalIF":6.3000,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714425005562","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This work aims to evaluate the performance of Vertical flow (VF) treatment wetlands (TWs) operated in parallel and sequentially for the treatment of combined sewer overflow (CSO) in Chile during the first operative period. An experimental plant was operated at three outflow rates: 0.01 L/(s*m2), 0.03 L/(s*m2) and 0.05 L/(s*m2). Influent and effluent samples from VF TWs were taken every 24 h for a period of 72 h. The water quality parameters that were evaluated included pH, Electrical Conductivity (EC), turbidity (TU), total suspended solids (TSS), 5-day biological oxygen demand (BOD5), chemical oxygen demand (COD, total and dissolved), forms of nitrogen (NH4+-N, NO3−-N, TN), total phosphorus (TP), and E. coli. Reductions in pH value below 1.0 and no significant reductions (p > 0.05) on EC were observed in effluents. Furthermore, removals above 75 % for TSS, TU, BOD5, and CODt, were stable during the 4-day operational time and for the three outflow rates. In terms of nutrients, similar behavior was observed for the three outflow rates. NH4+-N was effectively removed, without complete transformation into NO3−-N, and TN removal was enhanced after 2-day of operation. TP removal was above 60 % and related to Ca-content in sand used in the wetland bed. Significantly improved results were achieved at 0.03 L/(s*m2). However, E. coli showed low removals of 1 log-unit across the three outflow rates, necessitating an effluent disinfection system. Hence, the system based on VF TWs with parallel operation and sequential feeding, is a promising technology for CSO treatment in the Chilean context.
期刊介绍:
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies