Environmental Engineering

Integrated constructed wetlands for rural domestic wastewater treatment: A full-scale study in Ireland

by Mawuli Dzakpasu

Mawuli Dzakpasu, Valerie McCarthy, Miklas Scholz, Siobhán N. Jordan
World congress on Water, Climate and Energy, International Water Association, Dublin, Ireland, May 13-18, 2012.

Abstract
The paper reports the treatment performance capability, during an on-going full-scale study, which was... more Abstract
The paper reports the treatment performance capability, during an on-going full-scale study, which was set to evaluate the novel concept of integrated constructed wetlands (ICW) for domestic wastewater treatment in Ireland. The ICW at the center of this study is located at Glaslough in Co. Monaghan, Ireland. The 3.25 ha ICW comprises of two sludge cells and a sequence of five shallow vegetated wetland cells, and receiving primary domestic wastewater. Overall, mass removal rates greater than 90% were achieved for suspended solids, organic matter and nutrients during the monitoring period (February 2008 to June 2011). A direct correlation of organic loading on its removal rates was sustained over the entire period of monitoring, and indicated that the ICW had capacity for increased organic loads and could still be operated beyond the maximum ranges received during the course of this study. Nutrients removal, however, was slightly variable. Kinetic coefficients estimated for nutrients removal in the ICW indicated that nutrients removal was largely dependent on temperature, and showed a reduced removal rate under freezing conditions and under higher hydraulic loading rates. Enlarging the system to provide a longer hydraulic retention time can therefore, optimize the nutrient removal during such periods.

Facilitating Ecological Enhancement of Coastal Infrastructure: the Role of Policy, People and Planning.

by Martin Coombes

Naylor, L.A., Coombes, M.A., Venn, O., Roast, S., Thompson, R.C. (In Press). Facilitating Ecological Enhancement of Coastal Infrastructure: the Role of Policy, People and Planning. Environmental Science and Policy.

Urbanisation is recognised as a major pressure on coastal biodiversity. Increasing risks of flooding and erosion... more Urbanisation is recognised as a major pressure on coastal biodiversity. Increasing risks of flooding and erosion associated with future climate change indicate that new hard infrastructure will have to continue to be built—and existing structures upgraded—in areas of high social and economic value. Ecological enhancement involves undertaking management interventions at the design stage to improve the ecological potential of these structures, or to improve the ecological value of existing structures. While scientific research into ecological enhancement methods and designs is growing, there has been limited discussion of the non-science drivers and mechanisms by which ecological enhancements can be successfully implemented in coastal infrastructure projects. We explore the science-policy-practice interfaces of the ecological enhancement of hard coastal structures from three perspectives. First, we outline the growing number of European and UK policies and legislative instruments that are increasing the need to consider ecological enhancement in coastal developments. These serve as a facilitative tool for making enhancement projects happen, constituting a significant ‘policy push’ for research and application in this area. Second, we examine the role of people in influencing the uptake of ecological enhancements. The critical role of ‘knowledge brokers’ and the need for effective and sustained collaboration between a range of groups and individuals to get research approved and operational trials off the ground is discussed. Third, we examine where in the typical planning, design and build process current enhancement projects have been embedded, serving to illustrate how the science can be used in practice.

Drainage network detection and assessment of network storage capacity in agrarian landscape

by Paolo Tarolli

Published in Hydrological Processes, 2012. Co-authored with Federico Cazorzi, Giancarlo Dalla Fontana, Alberto De Luca, Giulia Sofia

Drainage networks in agrarian landscape within floodplains constitute surface's discontinuities that are expected to... more Drainage networks in agrarian landscape within floodplains constitute surface's discontinuities that are expected to affect hydrological response during floods. Drainage network recognition and quantification of water storage capacity within channels are, therefore, crucial for watershed planning and management. These evaluations require accurate spatial information for the area of interest and in most cases, when studying large catchments, broad datasets of ditches locations and descriptions are not available. In order to characterize drainage networks for large areas, the availability of high resolution topography derived by airborne laser scanner (LiDAR) represents a new and effective tool. Nowadays LiDAR DTMs covering large areas are readily available for public authorities, and there is a greater and more widespread interest in the application of such information for the development of automated methods aimed at solving geomorphological and hydrological problems. While LiDAR DTMs reliability in steep landscape has been proven by several recent studies, only few researches have been conducted to take into account the effectiveness of these data in agrarian low relief landscapes. The goal of this research is to propose a semi-automatic approach based on a LiDAR DTM to (1) detect drainage networks in agrarian/floodplain contexts, and (2) to estimate some of the network summary statistics (network length, width, drainage density and storage capacity). The procedure is applied in two typical alluvial-plain areas in the North East of Italy, and tested comparing automatically derived network with surveyed ones. The results underline the capability of high resolution DTMs for drainage network detection and characterization in the context of agrarian landscapes within floodplains, opening at the same time new challenges to evaluate some hydrological processes in these areas

Отражение экологической политики Индии и Китая в научном и общественно-политическом дискурсе [Reflexions of Indian and Chinese environmental policies in scientific and socio-political discourse]

by Ivan Sablin

published in Terra Humana: Общество, Среда, Развитие, no. 3, 2011, pp. 204–208.

Перед Китаем и Индией сегодня стоит сложная задача решения экологических проблем. Усилия правительств в данном... more Перед Китаем и Индией сегодня стоит сложная задача решения экологических проблем. Усилия правительств в данном направлении рассматриваются представителями научных и общественно-политических кругов двух стран как неэффективные, хотя в целом КНР добилась некоторых успехов. В научной литературе и в прессе предлагается целый ряд рекомендаций по совершенствованию экологической политики двух стран. Именно им и посвящена настоящая статья.

Теоретические аспекты экологической политики [Environmental policy: Theoretical aspects]

by Ivan Sablin

published in Молодой ученый, no. 6-2, 2011, pp. 58–65.

Экологическая проблематика стала предметом интереса целого ряда общественных наук в конце 1960-х – начале 1970-х... more Экологическая проблематика стала предметом интереса целого ряда общественных наук в конце 1960-х – начале 1970-х годов. Экологические направления появились в рамках многих дисциплин, включая экономику, социологию и политологию. Обращение экономистов, политологов и социологов к взаимоотношениям общества и природы обусловлено, прежде всего, теми социальными и политическими процессами, которые начались в западном мире в 1960-х годах. Всплеск общественного интереса к экологическим проблемам и все более широкое осознание глобального характера происходящих в окружающей среде изменений не только привели к появлению новой области исследований, но и стали вызовом для тех, кто принимает политические и экономические решения. В рамках различных научных дисциплин, а также на междисциплинарном уровне был разработан целый ряд концепций экологической политики.

Ilmu Teknologi Lingkungan - tulisan tahun 2011

by mochammad luthfi ardyanto

Removal of organic matter and nitrogen in an horizontal subsurface flow (HSSF) constructed wetland under transient loads.

by Antonio Albuquerque

A Albuquerque, M Arendacz, M Gajewska, H Obarska-Pempkowiak, P Randerson, P Kowalik
Water Science and Technology, 2009, V. 60, 7, 1677-1682.

A monitoring campaign in a horizontal subsurface flow constructed wetland under the influence of transient loads of... more A monitoring campaign in a horizontal subsurface flow constructed wetland under the influence of transient loads of flow-rate, organic matter, nitrogen and suspended solids showed an irregular removal of COD and TSS and lower both removal efficiencies and mass removal rates than the ones observed in other studies for similar operating conditions. This circumstance is associated to the presence of large amount of particulate organic matter from non-point sources. The mass removal rate of ammonia increased 39% as both the water and soil temperatures increased from weeks 1–8 to weeks 9–14. A good correlation between mass load and mass removal rate was observed for all measured parameters, which attests a satisfactory response of the bed under to transient loads.

Influence of bed media characteristics on ammonia and nitrate removal in shallow horizontal subsurface flow constructed wetlands

by Antonio Albuquerque

A Albuquerque, J Oliveira, S Semitela, L Amaral
Bioresource Technology. 2009, V. 100, 6269–6277.

Two bed media were tested (gravel and Filtralite) in shallow horizontal subsurface flow (HSSF) constructed wetlands in... more Two bed media were tested (gravel and Filtralite) in shallow horizontal subsurface flow (HSSF) constructed wetlands in order to evaluate the removal of ammonia and nitrate for different types of wastewater (acetate-based and domestic wastewater) and different COD/N ratios. The use of Filtralite allowed both higher mass removal rates (1.1 g NH4–N m2 d1 and 3 g NO3–N m2 d1) and removal efficiencies (>62% for ammonia, 90–100% for nitrate), in less than 2 weeks, when compared to the ones observed with gravel. The COD/N ratio seems to have no significant influence on nitrate removal and the removal of both
ammonia and nitrate seems to have involved not only the conventional pathways of nitrification–denitrification.
The nitrogen loading rate of both ammonia (0.8–2.4 g NH4–N m2 d1) and nitrate (0.6–3.2 g NO3–N m2 d1) seem to have influenced the respective removal rates.

Willows and reeds for bioremediation of landfill leachate: redox potential in the root zone

by Antonio Albuquerque

P. Randerson, L. Davies, A. Albuquerque, A. Bialowiec
Proc. International Conference ECO-TECH’10, 22-24 November 2010, Kalmar, Sweden, 877-886. (2) p. 877-886

Constructed wetlands can be used for bioremediation of landfill leachate (LL) making it safe to discharge into the... more Constructed wetlands can be used for bioremediation of landfill leachate (LL) making it safe to discharge into the environment. Wetland plants (reed and willow), contribute to pollutant removal, particularly of organic and nitrogen loads. Root exudates stimulate microbial activity and elevate oxygen levels in the rhizosphere which promotes nitrification. This study investigated the effects of reed and willow on bioremediation of LL in comparison with an unplanted control by measuring redox potential levels in the rhizosphere of microcosm systems in a greenhouse. Redox potential in the reed rhizosphere was consistently the highest, with the willow rhizosphere consistently the lowest. Redox potential fluctuated in the willow rhizosphere during daylight hours, with large decreases in the morning. Levels of NH4+ decreased dramatically in the first day of the experiment and remained at similar low levels in all tanks. Removal of ammonia took place in the control tank with peaks in NO2- and NO3-, but levels of NO3- remained high. Removal of ammonia was also observed in the reed tank with a peak in NO2-, but there was no peak in NO3-, as well as in the willow tank, but there were no peaks in NO2- or NO3-. Final levels of total-nitrogen, nitrate and chemical oxygen demand where considerably lower in the reed and willow tank than the unplanted control.

Evaluation of the effectiveness of horizontal subsurface flow constructed wetlands for different media

by Antonio Albuquerque

A. Albuquerque, J. Oliveira, S. Semitela, L. Amaral
Journal of Environmental Sciences, 2010, V. 22, 6, 820-825.

Two media bed (gravel and Filtralite NR) were tested in a mesocosm to evaluate the removal of organic matter (as... more Two media bed (gravel and Filtralite NR) were tested in a mesocosm to evaluate the removal of organic matter (as chemical oxygen demand (COD)), ammonia (NH4-N), nitrite, nitrate and solid matter (as total suspended solids (TSS)) for a synthetic wastewater (acetate-based) and a domestic wastewater. The use of Filtralite allowed average removal rates (6–16.8 g COD/(m2·day), 0.8–1.1 g NH4 -N/(m2·day) and 3.1 g TSS/(m2·day)) and removal efficiencies (65%–93%, 57%–85% and 78% for COD, NH4-N and TSS, respectively), higher than that observed in the experiments with gravel. The applied loads of COD, ammonia, nitrate and TSS seem to influence the respective removal rates but only for the treatment of domestic wastewater with higher correlation coefficients for Filtralite. Regardless the type of media bed and the type of wastewater, nitrate was completely removed for nitrogen loading rates up to
1.3 g NO3-N/(m2·day). There was no evidence of the influence of nitrate loads on the removal of organic matter.

Recycling pulp mill sludge to improve soil fertility using GIS tools

by Antonio Albuquerque

P. Ribeiro, A. Albuquerque, L. Quinta-Nova, V. Cavaleiro
Resources, Conservation & Recycling, 2010, V. 54, 12, 1303–1311.

Pulp mill sludge produced in the Cova da Beira region (Portugal) contains organic matter (11–47%), nitrogen (38–2560mg... more Pulp mill sludge produced in the Cova da Beira region (Portugal) contains organic matter (11–47%), nitrogen (38–2560mg N/kg) and phosphorus (167–370mg P/kg), which may be valuable for increasing soil productivity. The levels of heavy metals are below the limits recommended by legislation and the
amount of nitrogen and phosphorous to be introduced in soils does not present a risk for nutrient leaching.
After identifying the environmental and technical restrictions on its application, an area of 1650 ha was identified where the sludge can be applied in forage crops, fruit trees, olive groves and vineyards. A suitable area was also found for a biosolids storage centre. The use of GIS allowed to define a sludge
application index and to produce land-use suitability maps, which can be useful for sludge management.

Evaluation of the stability of waste-based geopolymeric artificial aggregates for wastewater treatment processes under different curing conditions

by Antonio Albuquerque

I. Silva, J. Castro-Gomes, A. Albuquerque
Advances in Science and Technology, 2010, V. 69, 86-91.

Waste geopolymeric artificial aggregates (WGA) with different atomic ratios of mining waste mud/Na2SiO (4 to 5) and... more Waste geopolymeric artificial aggregates (WGA) with different atomic ratios of mining waste mud/Na2SiO (4 to 5) and Na2SiO/NaOH (1.25 to 5) were produced using curing temperatures of 20ºC and 130ºC and its structural stability and pH variation after immersion in water was observed during 3 months. Results showed that WGA with mud/Na2SiO and Na2SiO/NaOH of 5 and 4, respectively, cured at 20ºC presented good stability in water and pH decreased from 10 to 7
in 24 days. Compressive strength was determined in additional samples cured at 20ºC and 80ºC in dry conditions, for 13 curing ages and 15 water immersion periods (up to 14 weeks). Results of this second stage showed that increasing temperature to 80ºC accelerated compressive strength gain but
only during the first 3 weeks (up to 15.4 MPa). After 24 h in water compressive strength decreased to half of the initial values determined in dry conditions in all samples and, therefore, the increase of temperature did not bring benefits to WGA strength in water. Regardless the curing temperature and the dry curing age comprehensive strength stabilizes between 1 MPa and 2 MPa after 4 weeks immersion in water, which are values that makes WGA suitable to be used as bed material for wastewater treatment processes.

Analysis of constructed wetland performance for irrigation reuse

by Antonio Albuquerque

H. Marecos do Monte, A. Albuquerque
Water Science and Technology, 2010, V. 61, 7, 1699-7105.

Most of the wastewater treatment systems in small rural communities of the Cova da Beira region (Portugal) consist of... more Most of the wastewater treatment systems in small rural communities of the Cova da Beira region (Portugal) consist of constructed wetlands (CW) with horizontal subsurface flow (HSSF). It is believed that those systems allow the compliance of discharge standards as well as the production of final effluents with suitability for reuse. Results obtained in a nine-month campaign in an HSSF bed pointed out that COD and TSS removal were lower than expected. A discrete sampling also showed that removal of TC, FC and HE was not enough to fulfill international irrigation goals. However, the bed had a very good response to variation of incoming nitrogen loads presenting high removal of nitrogen forms. A good correlation between mass load and mass removal rate was observed for BOD5, COD, TN, NH4-N, TP and TSS, which shows a satisfactory response of the bed to the variable incoming loads. The entrance of excessive loads of organic matter and solids contributed for the decrease of the effective volume for pollutant uptake and therefore, may have negatively influenced the treatment capability. Primary treatment should be improved in order to decrease the variation of incoming organic and solid loads and to improve the removal of COD, solids and pathogenic. The final effluent presented good physical–chemical quality to be reused for irrigation, which is the most likely application in the area.

Analysis of the reclamation treatment capability of a constructed wetland for reuse

by Antonio Albuquerque

F. Pedrero, A. Albuquerque, L. Amado, H. Marecos do Monte, J. Alarcón
Water Practice & Technology, 2011, V. 6, 3, 9 p.

A research project was conducted during 2008-2009 in Portugal to evaluate the potential of reclaimed water from... more A research project was conducted during 2008-2009 in Portugal to evaluate the potential of reclaimed water from constructed wetlands for irrigation reuse. A 21 month monitoring campaign was set up in a Filtralite-based horizontal subsurface flow bed. Results showed a significant fluctuation of the hydraulic loading rate that has influenced the hydraulic retention time and the wastewater characteristics over time and, therefore, the removal efficiencies for BOD5, COD, TSS, nitrogen and phosphorus were lower than the reported values for CW performance. If the hydraulic loading rate could be properly controlled the treatment performance, as well as the quality of the reclaimed water, can be improved considerably. The effluent concentrations of conductivity (EC), BOD5, COD, TN, K, Ca, Mg and phytotoxic elements (Na, Cl and B), showed a suitable quality for irrigation reuse according to different international standards, although it is necessary to improve the removal of phosphorous and a final disinfection must be implemented to decrease the pathogenic content.

Application of GIS-based multi-criteria analysis for site selection of aquifer recharge with reclaimed water

by Antonio Albuquerque

F. Pedrero, A. Albuquerque, H. Marecos do Monte, V. Cavaleiro, J. Alarcón
Resources, Conservation and Recycling, 2011, V. 56, 105– 116.

Reclaimed water from small wastewater treatment facilities in the rural areas of the Beira Interior region (Portugal)... more Reclaimed water from small wastewater treatment facilities in the rural areas of the Beira Interior region (Portugal) may constitute an alternative water source for aquifer recharge. A 21-month monitoring period in a constructed wetland treatment system has shown that 21,500 m3 year−1 of treated wastewater
(reclaimed water) could be used for aquifer recharge. A GIS-based multi-criteria analysis was performed, combining ten thematic maps and economic, environmental and technical criteria, in order to produce a suitability map for the location of sites for reclaimed water infiltration. The areas chosen for aquifer
recharge with infiltration basins are mainly composed of anthrosol with more than 1 m deep and fine sand texture, which allows an average infiltration velocity of up to 1 m d−1. These characteristics will provide a final polishing treatment of the reclaimed water after infiltration (soil aquifer treatment (SAT)),
suitable for the removal of the residual load (trace organics, nutrients, heavy metals and pathogens).
The risk of groundwater contamination is low since the water table in the anthrosol areas ranges from 10 m to 50 m. On the other hand, these depths allow a guaranteed unsaturated area suitable for SAT. An area of 13,944 ha was selected for study, but only 1607 ha are suitable for reclaimed water infiltration.
Approximately 1280 m2 were considered enough to set up 4 infiltration basins to work in flooding and
drying cycles.

Influence of stormwater infiltration on the treatment capacity of a LECA-based horizontal subsurface flow constructed wetland

by Antonio Albuquerque

L. Amado, A. Albuquerque, A. Espirito Santo
Ecological Engineering, 2012, V. 39, 16-23.

This research work evaluates the impact of stormwater infiltration on the removal of organics, solids, nitrogen and... more This research work evaluates the impact of stormwater infiltration on the removal of organics, solids, nitrogen and phosphorus in a LECA-based horizontal subsurface flow constructed wetland. Stormwater runoff for the period between January 2008 and June 2010 (30 months) was estimated for the drainage basin of the Vila Fernando wastewater treatment plant (constructed wetland system) and it was observed proportionality between the increase in surface runoff and the infiltration flow rate that reached the plant. The average stormwater infiltration rate that reached the plant was 67.4 m(3) d(-1) (77% of the influent flow rate into the plant). The 30 month monitoring campaign set up at one of the reed beds showed that stormwater infiltration led to a high variation of the hydraulic loading rate (HLR) throughout the bed, which affected its performance in the removal of organic matter, suspended solids and nitrogen. For a HLR below 20 cm d-1 the removal efficiencies for BOD5, COD and TSS doubled. The removal of nitrogen was too low and was associated with the weak development of nitrifying biofilm and the poor growth of reeds. However, it was observed a good relationship between the applied and removed loads for most of the parameters, which seems to indicate that the organic, solid, nitrogen and phosphorus loading rates influenced the respective removal rates. The use of a bed material with high specific surface area, such as LECA, can only improve the treatment capacity of horizontal subsurface flow systems if the organic and solid loading rates, as well as the HLR, can be effectively controlled.

The influence of plants on nitrogen removal from landfill leachate in discontinuous batch shallow constructed wetland with recirculating subsurface horizontal flow

by Antonio Albuquerque

A. Białowiec, L. Davies, A. Albuquerque, P. Randerson
Ecological Engineering, 2012, V. 40, 44-52

Three discontinuous batch shallow constructed wetland systems with recirculating subsurface horizontal flow with reed,... more Three discontinuous batch shallow constructed wetland systems with recirculating subsurface horizontal flow with reed, willow, and without plants were used to assess the removal of nitrogen from landfill leachate in relation to hydraulic retention time and climatic conditions. In all systems redox potential in the beds increased asymptotically from negative anoxic conditions to +67 (reed bed), −2 (willow bed), and +17 mV (control bed), reaching a plateau in two wk. During the first 24 h after feeding the beds all forms of nitrogen decreased significantly. It has been shown that plants release O2 and Norg which was then hydrolyzed to ammonia. Plant-available radiation significantly (p < 0.05) increased the release of Norg and removal of ammonia after the 9th day of the experiment. Low, and relatively constant concentrations of nitrite and nitrate indicated that denitrification had taken place in the beds.

Potential for reuse of tungsten mining waste-rock in technical-artistic value added products

by Antonio Albuquerque

J. Castro-Gomes, A. Silva, R. Cano, J. Suarez, A. Albuquerque
Journal of Cleaner Production, 2012, V. 25, 34-41

Mining and quarrying activities in Europe generate approximately 55% of total industrial wastes, according to a recent... more Mining and quarrying activities in Europe generate approximately 55% of total industrial wastes, according to a recent Eurostat report. Most of these wastes are directly dumped on land or deposited in landfill sites. The first solution may lead to negative environmental impacts on land (removal of vegetation, deforestation, land slope changes and increased risk of erosion), water (pollutant transport through surface runoff, soil infiltration and contamination of water resources), may lead to the contamination of agricultural goods and may impose risks on human health. In Portugal, about 20% of industrial waste produced originates from mines and quarries, particularly from Panasqueira mining, one of the largest tungsten mines in the world. Currently, Panasqueira mining generates almost 100 tonnes of waste-rock, per day. Such waste-rock have accumulated over a number of years into very large heaps and it is desirable to seek new economic solutions that can contribute towards their reuse. In this context, this work discusses the potential for reuse of waste-rock piles of Panasqueira tungsten mine, which may be a case statement to be followed. The proposed solution described in this paper consists in developing innovative polymer-based composite materials, obtained from non-contaminated waste-rock tailings. Such materials must have suitable properties for technical-artistic value added applications, such as conservation, restoration and/or rehabilitation of historic monuments, sculptures, decorative and architectural intervention, or simply as materials for building revetments.

Mineral wastes geopolymeric artificial aggregates as alternative materials for wastewater-treatment processes - Study of structural stability and pH variation in water

by Antonio Albuquerque

Silva I., Castro-Gomes J. & Albuquerque A.
Journal of Materials in Civil Engineering, V. 24, Nº 6, 1-6.

Artificial aggregates produced from mine waste geopolymeric binders were studied as a potential substrate for... more Artificial aggregates produced from mine waste geopolymeric binders were studied as a potential substrate for fixed-film
wastewater-treatment processes (biofilm reactors). Waste geopolymeric artificial aggregates (WGA) of 2–3 cm in size were produced using geopolymeric mine waste mud as a precursor and both sodium silicate and sodium hydroxide as alkaline activators. Seven mixtures were produced with different atomic ratios of sodium silicate to sodium hydroxide (S/H) and of precursor (waste mud) to sodium silicate (P/S), using curing temperatures of 20°C and 130°C, for a total of 112 samples. Structural stability and pH variation after immersion in water were observed over an 18-week period. The results showed that the initial water pH decreased with the increase of the curing time, taking between 17 and 42 days to reach pH 8. The mixture cured at 20°C for 28 days appears to be suitable for use as a substrate for biofilm reactors because the initial water pH was one of the lowest (approximately pH 10), and the time necessary to stabilize it to approximately pH 8 was only 17 days.

Effect of immersion in water partially alkali-activated materials obtained of tungsten mine waste mud

by Antonio Albuquerque

Silva I., Castro-Gomes J. & Albuquerque A.
Construction and Building Materials, V. 35, 117-124.

Alkali-activated binders can be obtained using several sources of alumino-silicate materials, from calcinatedmore Alkali-activated binders can be obtained using several sources of alumino-silicate materials, from calcinated
clays, like kaolin, to industrial by-products, such as fly ash and, more recently, to calcinated waste mud from mining activities. The technology to obtain alkali-activated binders, also designated as geopolymers, is gaining increasing interest, since, in some cases, the properties of geopolymeric materials
are superior to other existing cementitious systems. The research presented in this paper intends to deepen
the knowledge regarding the properties of geopolymeric materials obtained using tungsten mining waste mud, particularly to study its behaviour after being immersed in water. However, in the current work, focus is given to follow compressive strength results in partially alkali-activated samples immersed in water, during different curing periods of time. Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy analysis (FTIR) were also utilised to investigate changes in the microstructure at different conditions of water immersion. A significant decrease in compressive strength occurring after 24 h of immersion in water was found out, of specific partially alkali-activated materials, despite of its initial high compressive strength after 35 days curing, at different temperatures.