Ana Galvão

Ana Galvão
Technical University of Lisbon | UTL · Centre for Hydrosystems Studies (CEHIDRO)

PhD

About

50
Publications
14,339
Reads
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847
Citations
Additional affiliations
January 2015 - present
Instituto Superior Técnico
Position
  • Researcher
January 2009 - present
Instituto Superior Técnico
Position
  • Professor (Assistant)
November 2003 - January 2009
Instituto Superior Técnico
Position
  • Professor (Assistant)

Publications

Publications (50)
Article
Full-text available
A pilot-scale study on sludge treatment reed beds investigated the combined effects of earthworms and Arundo donax on sewage sludge dewatering and residual sludge quality. Four units were tested: one planted with earthworms, one planted without earthworms, one unplanted with earthworms, and one control, each unit replicated. Over a year, 24 cycles...
Article
Full-text available
Sludge treatment reed bed planted (STRB) with Phragmites australis (P.australis) and Arundo donax (A.donax) was assessed in the presence of Eisenia fetida under control condition during the dry season. Worm-planted units were fed with mixed sewage sludge (dry and volatile solids of 29.44 g DS.L⁻¹ and 24.23 g VS.L⁻¹). Sludge loading rates (SLR) of 5...
Article
A one-year study of sludge treatment reed bed assisted with earthworms (W-STRB) was conducted in a temperate climate. The effects of using Eisenia fetid and Arundo donax on W-STRB water balance (WB) and dewatering efficiency (DE) were investigated. Four different bed configurations were tested: worm-planted (WP), planted (P), worm-control (W), and...
Article
Full-text available
To ensure the successful implementation of Nature-Based Solutions (NBS), it is essential to assess the perception of key stakeholders. To visualize the perception of NBS key stakeholders and to identify potential opportunities and eventual conflicting interests, five groups of stakeholders were identified: i) academics, ii) governments, iii) NGOs,...
Article
Full-text available
The treatment of greywater (GW, wastewater share excluding toilet flush) through green walls can be beneficial for urban areas, favouring the diffusion of urban vegetation and reducing potable water consumption. Multiple challenges hinder the treatment performance of green walls, including the composition of the filtering material, the number of le...
Article
Full-text available
Assessing the Nature-Based Solutions (NBS) contribution to urban resilience, along with developing tools capable of demonstrating their long-term value, comprises a most needed step forward. Nevertheless, the NBS contribution to urban resilience has been yet slightly explored. Given the urban resilience complexity and multiple NBS capabilities, spe...
Article
Full-text available
Ponds are a common feature in urban parks to provide aesthetic and recreational functions, but also deliver a wide range of ecosystem services. The objective of this study was to assess the water quality of six urban ponds in the city of Lisbon, Portugal, to determine the factors that influence it and consider remediation measures for them. Besides...
Article
The integration of performance assessment may be determinant for water utilities and municipalities to improve their management practices regarding storm water systems (SWS). The use of performance assessment in the SW sector has been incipient, and the need to develop a performance assessment framework (PAF) that constitutes a reference for SWS wa...
Article
Full-text available
The continuous growth of urban areas in the last decades has resulted in an increase in water consumption, contributing to larger volumes of urban and domestic wastewater. Thus, stakeholders have been seeking for efficient alternatives for wastewater management, namely looking for new forms of treatment and reuse. The present work provides new insi...
Article
Sludge Treatment Reed Beds (STRBs) have been used worldwide over the past few decades. This review aims to overarchingly identify and appraise the currently available knowledge of STRB technology and discern climatic patterns through Meta-Analysis (MA). We systematically searched Google Scholar, Scopus, and Web of Science databases (up to Dec 2021)...
Article
Performance assessment is recognized as an important management tool for urban water systems. This article describes the application of a performance assessment framework for storm water systems, in collaboration with two Portuguese urban water utilities. A performance assessment system was built for each water utility, including objectives, assess...
Article
Nature-Based Solutions (NBS) provide a systemic approach to promote the maintenance, enhancement, and restoration of biodiversity and ecosystem services (ES) in urban areas, helping to enhance urban resilience in the water sector. Within the sustainable development goals proposed by UNHABITAT, resilience in cities was established as a critical issu...
Article
Decentralized water reuse in cities is a prominent alternative to mainstream top-down models for urban water treatment, which are based on centralized, linear dynamics of resource management. In this sense, Nature-based Solutions (“green” technologies) coupled with advanced technologies (“grey” technologies) constitute a promising approach for fome...
Article
According to the European Research and Innovation Policy Agenda, nature-based solutions (NBSs) are key technologies to improve the sustainability of urban areas. Among NBSs, green walls have been recently studied for several applications, among the others the treatment of lowly polluted wastewater flows as greywater (GW, e.g. domestic wastewater ex...
Article
Full-text available
Water in the city is typically exploited in a linear process, in which most of it is polluted, treated, and discharged; during this process, valuable nutrients are lost in the treatment process instead of being cycled back and used in urban agriculture or green space. The purpose of this paper is to advance a new paradigm to close water cycles in c...
Thesis
Full-text available
Over the past two decades, performance assessment (PA) has been one of the areas show-ing the greatest advancement in the water sector. PA aims to measure effectiveness and/or efficiency of an activity or process using performance metrics, supporting the decision-making process and the continuous improvement of water utilities. Despite the potentia...
Article
Full-text available
Graywater (GW), i.e., the portion of household wastewater that excludes toilet flushes, is an interesting wastewater type because it requires only mild treatment. Green walls have been proposed as example of a nature-based solution for GW treatment due to low energy requirement and high ecological/societal benefits; however, indications about their...
Article
Full-text available
Cities face unprecedented demographic, environmental, economic, social, and spatial challenges. In recent years, the implementation of nature-based solutions (NBS) is becoming more relevant in cities to improve urban resilience and to cope with climate change. NBS represent cost effective solutions that simultaneously provide environmental, social,...
Article
Full-text available
Microplastics are widely recognized as a category of emergent pollutants that can cause complex ecotoxicological effects. Synthetic fibers released during the washing of textiles are a relevant source of microplastics, which reach aquatic ecosystems from sewer discharges, even when there is retention in wastewater treatment plants. In this paper, w...
Article
Full-text available
Performance assessment is an important management tool in the water sector, and it is recognised that its integration on storm water systems’ management would bring benefits to storm water utilities. In this context, it has been identified the need to develop a performance assessment framework for urban storm water systems, that is comprehensive, o...
Article
Full-text available
Urban waters represent a crucial component for the enhancement of urban resilience due to their importance in cities. Nature-based solutions (NBS) have emerged as sustainable solutions to contribute to urban resilience in order to meet the challenges of climate change. In order to promote the use of NBS for increasing urban resilience, tools that d...
Article
Full-text available
Recognizing greywater as a relevant secondary source of water and nutrients represents an important chance for the sustainable management of water resource. In the last two decades, many studies analysed the environmental, economic, and energetic benefits of the reuse of greywater treated by nature-based solutions (NBS). This work reviews existing...
Conference Paper
RESUMO Um dos objetivos do desenvolvimento sustentável, propostos pela UNHABITAT, estabelece a resiliência nas cidades como uma questão crítica. A resiliência urbana é definida como a capacidade de uma cidade de absorver as perturbações, aprender com o passado, adaptar-se, transformar-se e preparar-se para o futuro. As soluções baseadas na natureza...
Article
Full-text available
Soil improvement using ureolytic bacteria or other biological agents is a promising technique currently under investigation. It is based on the precipitation of calcium carbonate (biocement) due to the enzymatic hydrolysis of urea. The biocement produced clogs the soil pores, consequently bonding the soil grains and increasing overall strength and...
Article
This study investigated the occurrence of storage mechanisms in biofilm from constructed wetlands (CWs) through respirometric studies and calculated the corresponding heterotrophic growth yields. Respirometric tests were performed in biofilm extracted from horizontal sub-surface flow CWs batch loaded with three different COD mass loads: 7.0., 15.6...
Article
Full-text available
Over the past two decades, performance assessment based on performance indicators (PI) has been one of the areas showing the greatest advancement in the water sector. This practice may be defined as any approach that aims to measure effectiveness and/or efficiency of an activity or process using PI, supporting the decision-making process and encour...
Conference Paper
A resiliência é usualmente entendida como a capacidade de um sistema de absorver uma perturbação e reorganizar-se enquanto sofre mudanças, de modo a manter a mesma função, estrutura, identidade e capacidade de resposta (Folke, 2006). A resiliência emergiu como uma perspetiva interessante para as cidades, teorizadas como sistemas adaptativos altamen...
Article
Full-text available
This study aimed at analysing the performance of horizontal subsurface flow constructed wetlands (CWs) to treat combined sewer overflow (CSO). Four horizontal subsurface flow CWs, organized in two groups (A and B) each with a planted (Phragmites australis) and a non-planted bed, were loaded with simulated CSO, with group B receiving twice the hydra...
Article
This study investigated the possibility of measuring yield coefficient values for the biomass of a laboratory-scale horizontal sub-surface flow constructed wetland (HSSF-CW) using a static respirometer. The respirometric tests used 300 mL bulk volume of biomass-laden gravel samples from the HSSF-CW, from which the biomass was detached by a vigorous...
Conference Paper
Full-text available
The main goal of this paper is to present the assessment of clogging degree of two horizontal subsurface flow constructed wetlands. The horizontal subsurface flow constructed wetlands of Martinlongo WWTP, located in Algarve, are currently suffering from water insurgences which expose the wastewater to the surface, an undesirable phenomena due to th...
Article
Although horizontal flow constructed wetlands (HF CWs) are usually subjected to unsteady loads in real application, the modelling of HF CW response to time-variable loads has been scarcely studied in literature yet. The aim of this study is to test the capability of HYDRUS-CWM1 to simulate the behavior of HF CWs subjected to unsteady loads. Hence,...
Article
The use of constructed wetlands as a valuable and attractive method for combined sewer overflow (CSO) treatment has been demonstrated in several studies. In Portugal, a Mediterranean country having usually a long dry period, there are still no applications of this technology. The purpose of this research is to gather information and know-how requir...
Article
The aim of this study is to evaluate the buffering capacity of constructed wetlands by analyzing the response to sudden organic load changes. Nine horizontal flow experimental beds were divided into three equal groups and monitored in a three-phase experiment. Influent COD mass loads during Phase I were 11.4, 5.3 and 0 g/m2/day for Groups A–C, resp...
Article
Although the application of complex integrated models to wastewater systems is useful, it is often difficult to implement and not always suitable for the design of new systems or for their rehabilitation. Integrated simple approaches that allow assessing the environmental performance of urban wastewater systems may be advantageous, especially durin...
Article
Constructed wetlands are wastewater treatment technologies based in natural systems, and their environmental and hydraulic behaviour is influenced by weather conditions like temperature, solar radiation and precipitation. In this paper, a one-dimensional dynamic model applicable to horizontal flow constructed wetlands is presented. The structure of...
Article
Full-text available
Portugal is a small Mediterranean country. Where wastewater treatment is concerned, the Portuguese levels of service in 2000 and 2006 were, respectively, 55% and 80%.These levels of service will continue to increase until 2013. Because of economic, environmental, and energy concerns, the design, construction, and operation of wastewater treatment p...
Article
Full-text available
Wastewater treatment plants serving low flows require special attention in many countries, where a significant part of the total population lives in small agglomerations. This may be especially relevant in interior regions, where agglomerations are generally scattered and there is no economy of scale in centralised systems, thus suggesting local an...
Article
In a significant number of European countries, the need for providing appropriate treatment for the effluents of small rural communities is still especially relevant. In fact, in countries like Portugal, Spain, and many others, significant amounts of investment will be addressed in the next few years to the construction of small Wastewater Treatmen...
Conference Paper
A presente comunicação pretende contribuir para o desenvolvimento de ferramentas de apoio à gestão técnica de sistemas interceptores de águas residuais, através da apresentação de uma metodologia sistematizada de avaliação do desempenho, identificando medidas ou indicadores de desempenho. A metodologia apresentada contempla as componentes da rede d...
Article
Full-text available
This report aims at studying the economic development of the Lisbon and Tagus Valley Region in the context of economy of the Portuguese continental territory and the development observed inside the Lisbon Metropolitan Area (LMA), which is a part of the Lisbon and Tagus Valley Region. A historical overview will be made in order to better understand...

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