Potable Water Supply Research Articles

Suitability of rainwater harvesting in saline and arsenic affected areas of Bangladesh

A major portion of Bangladesh is currently experiencing a scarcity of safe drinking water because of arsenic contamination, high salinity and human-induced pollution. The objectives of this study were to identify locations with a high scarcity of drinking water and suitability of harvesting rainwater. Kriging interpolation algorithms of Geographical Information System (GIS) was employed to identify the probable water scarce zones as well as suitable zones of harvesting rain water from the available data of secondary sources. Statistical methods were employed to cluster, correlate, and regress variables such as rainfall, salinity, and As. The results showed that groundwater quality in the southwestern parts of Bangladesh is saline with high concentration (>10000 μS/cm). On the other hand, the northeastern and southwestern parts of Bangladesh are also vulnerable to arsenic contamination (60 %–97 % of tubewells), compared to other regions. The rainfall zonation map, covering the years 1951–2022, indicated that the Sylhet division had the highest potential for rainfall (ranging from 2600 to 3900 mm). From this study it was demonstrated that Sylhet, Noakhali, Bhola, Barishall, Patuakhali, Bagerhat, and Khulna were identified as suitable places for sustainable rainwater harvesting (RWH). The findings of this study may play significant role towards achieving sustainable potable water supply in vulnerable zones, if they receive attention from policymakers.

Effect of Micro Economic Factors on Residential Property Value in Birnin Kebbi, Kebbi State, Nigeria

The research aims to assess the microeconomic factors affecting residential property values in Birnin Kebbi. Property serves as an asset for any individual, as real estate is one of life's primary goals. Besides the need to eat and drink, property also plays a crucial role in daily life. Property values are influenced by various factors, which can be either microeconomic or macroeconomic in nature, or both. Many microeconomic variables are related to property attributes and buyer demographic profiles. To achieve this aim, two objectives were formulated: (i) to examine the types of property and microeconomic factors affecting property values in the study area, and (ii) to assess the effect of microeconomic factors on residential property values. Both primary and secondary sources of data were used for data collection. Out of 377 questionnaires administered, 321 were retrieved. Simple random sampling and stratified random sampling methods were employed. Quantitative methods were used for data analysis, and all data gathered were analysed using descriptive statistics and the Likert scale. The study found that physical characteristics of residential properties, such as types of materials used, building design, room sizes, parking spaces, building age, and landscape, significantly influence property values. Additionally, the types of finishes (roofs, walls, ceilings, and floors), infrastructural facilities, and social amenities (number of toilets, electricity fittings, waste disposal and sewage, potable water supply, and various sanitation facilities) also play a role. The effects of microeconomic variables on property values in the study area include insecurity, increased traffic, property price changes, nuisances, environmental quality, property demand, and time consumption. The study recommends that prospective property developers ensure the use of standard building finishes to maximize returns on their investment in property value. Additionally, the government should introduce policies to ease difficulties in importing housing materials and promote the manufacture of local ones.

Who Gets Water? Governance Failures & Persistent Drinking Water and Sanitation Issues

he sustainable provision of potable water and sanitation services presents a multitude of fundamental challenges concerning access and allocation. These challenges extend beyond water resources themselves, encompassing the allocation of rights, responsibilities, and associated risks. Disparities in water supply and sanitation services are stark, both geographically and socioeconomically. A thorough analysis requires examining the international governance instruments that guide access, the property rights frameworks that dictate allocation, and the scales at which these rights and frameworks operate. Additionally, the responsibilities vested in various authorities and stakeholders must be scrutinized. Water insecurity, particularly with respect to drinking water and sanitation, is not solely attributable to natural phenomena. This paper presents a literature review (2008-2023) encompassing research from the Earth Systems Governance community and beyond, focusing on water supply services and sanitation. Access and allocation were interpreted broadly, encompassing issues of inclusive development, justice, sustainability, and additional themes identified through the review process. The findings suggest a significant role for governments in facilitating access and allocation, with failures in these areas leading to long-term consequences. This will necessitate a holistic approach that considers water access and allocation alongside interconnected issues like sanitation, development, climate change, energy, and food security, all within a multi-level governance framework.

The challenge of closing the climate adaptation gap for water supply utilities

Many drinking water utilities face immense challenges in supplying sustainable, drought-resilient services to households. Here we propose a quantified framework to perform drought risk analysis on ~5600 potable water supply utilities and evaluate the benefit of adaptation actions. We identify global hotspots of present-day and mid-century drought risk under future scenarios of climate change and demand growth (namely, SSP1-2.6, SSP3-7.0, SSP5-8.5). We estimate the mean rate of unsustainable or disrupted utility supply at 15% (interquartile range, 0–26%) and project a global increase in risk of between 30–45% under future scenarios. Implementing the most cost-effective adaptation action identified per utility would mitigate additional future risk by 75–80%. However, implementing the subset of cost-effective options that generate sufficient tariff revenue to provide a benefit-cost ratio that is greater than 1 would only achieve 5–20% of this benefit. The results underline the challenge of attracting the financing required to close the climate adaptation gap for water supply utilities.

Prevalence and risk factors of intestinal parasitoses among residents of Ekemkpon and Idim Ita of Cross River State, Nigeria

Background: intestinal parasitic infections are the most common infections in the world, with the most prevalent burden occurring in poverty-stricken areas. Intestinal parasitic infections are endemic in certain parts of Nigeria as a result of poor hygiene practices and pollution, which result in contamination of food and water. In semi-urban and rural communities where the dwellers are generally poor and uneducated and lack basic amenities like potable water supply and good sanitary facilities, intestinal parasitic infections cause major health problems. This study was to evaluate the influence of socio-demographic factors in the transmission of intestinal parasitoses among the residents of Ekemkpon and Idim Ita Communities of Cross River State, Nigeria. Materials and Methods: this was a cross-sectional survey between April 2019 and August 2019. Samples were obtained from 359 participants in the study areas and examined for stool analysis using direct microscopy and brine floatation technique. Socio-demographic data of the study subjects were obtained using questionnaires. Results: the prevalence of intestinal parasites was higher in Ekemkpon (41.0%) than in Idim Ita (14.9%). Participants with mixed infections in Ekemkpon were 7.9%, while those in Idim Ita were 2.2%. The study has shown that level of education had an influence on the transmission of intestinal parasites in Ekemkpon (p<0.05). Open defecation played a major role as a source of contamination of domestic water and farm products in the Ekemkpon community. The overall helminthic infections in the two study areas were higher than the protozoan infections observed in this study. The only intestinal protozoa in Ekemkpon was Entamoeba histolytica/dispar while hookworm species were the commonest helminthic parasites in Ekemkpon. Balantidium coli (4.4%) was the most prevalent intestinal protozoan parasites in Idim Ita while hookworm and Ascaris lumbricoides (2.8%) were the most occurring helminthic parasites in Idim Ita. Conclusions: it is recommended that strategies aimed at health education, diagnosing and treating those positive for intestinal parasite infections, and improving the general well-being of the masses be encouraged.

Projected energy and hydrological budgets over the Indus River Basin under a CORDEX-SA regional climate model framework

The Indus River is one of the largest transboundary rivers in Asia originating from Tibet autonomous region of China. This supplies water to the great plains of Punjab, significantly influencing agricultural productivity and shaping the socioeconomic conditions of the region's inhabitants. The present study investigates the potential impact of climate change on the water resources of the Indus River Basin (IRB). The study utilized the output from a regional climate model, REMO, to examine the projected change in energy and hydrological budget at 1.5, 2 specific warming levels and at the end of the century over IRB under three different representative concentration pathways (RCPs). The projected rise in the temperature from the historical period to the end of the century (both summer and winter) can be attributed to the increase in net downward energy flux compared to net upward energy flux. In the mid-century, the downward longwave radiation flux (sensible and latent heat flux) plays a dominant role in determining the surface energy balance during winter (summer). While, the combined impact of the energy components becomes more dominant at the end of the century for both seasons. Rainfall is projected to increase in the mountains of the upper Indus basin and gradually decline on the plains of the lower Indus basin till the end of the century. The projected decline in water storage over the plains of IRB can be attributed to the combination of declining rainfall and increasing evaporation. This will exert significant pressure on agriculture, industry and more importantly on the potable water supply. The IRB is found to be highly susceptible to climate extremes such as floods and drought. Climate change information is crucial for policy planners, governance, decision-makers, management authorities, etc. as it enables the implementation of better management practices, Additionally, it provides both short-term and long-term goals for a mitigation-based approach to reduce the impact of climate change.

Smart Water Management Grid

The Smart Water Management Grid (SWMG) lever- age the power of the Internet of Things (IoT) to revolutionize water management, ensuring efficiency, sustainability, and reliability in water distribution systems. By integrating sensors such as level monitoring, pressure monitoring, leakage control, and pH sensors, these grids enable real-time monitoring and intelligent decision-making to optimize water usage and minimize wastage. One crucial aspect of smart water grids is level monitoring, which tracks water levels in reservoirs, tanks, and pipelines. By continuously monitoring water levels, authorities can ensure optimal storage and distribution, preventing shortages or over- flows. Pressure monitoring sensors further enhance efficiency by maintaining optimal pressure throughout the distribution network, minimizing energy consumption and reducing the risk of pipe bursts. Leakage control is another significant feature facilitated by IoT sensors in smart water grids. Advanced leak detection sensors can pinpoint even minor leaks in the system, enabling swift repairs and preventing significant water losses. This proactive approach not only conserves water but also reduces operational costs and mitigates potential damage to infrastructure and the environment. Moreover, integrating pH sensors into the water grid allows for real-time monitoring of water quality. Maintaining proper pH levels is critical for ensuring safe and potable water supply. By detecting variations in pH levels, authorities can promptly identify and address potential contamination issues, safeguarding public health and preventing waterborne diseases.

Water scarcity in the fast‐growing megacity of Lagos, Nigeria and opportunities for managed aquifer recharge

AbstractIn the last three decades, the world has experienced a rapid emergence of megacities. The increasing demographics, urbanization, and water demand brought severe and undesired effects on the quantity and quality of their water resources. A prime example is Lagos (Nigeria, West Africa), which is projected to become the world's largest city by 2100, and faces water scarcity challenges common to other megacities of developing countries. A literature review reveals the vast gap between water demand and regulated supply, inadequate knowledge and information on the current state of water (re)sources, and major, yet unregulated, use of groundwater. It further highlights the impacts of uncontrolled wastewater discharge into surface waters and aquifers, the role of increasing paved surfaces and blocked drainages on flooding, the inadequate supply of potable water, and the unsustainable abstraction of groundwater. Here, we examine the potential of managed aquifer recharge (MAR) to address these recurrent challenges across the megacity. The analysis reveals the opportunities and potential risks associated with the capture of wastewater, storm water, and brackish surface water for MAR. These waters, after appropriate treatment and subsurface storage may bridge the growing water supply–demand gap and mitigate the effects of groundwater (over)exploitation, including aquifer depletion, saltwater intrusion and land subsidence. Immediate efforts should focus on improving the conceptual and quantitative knowledge of Lagos' hydrogeology and groundwater resources through comprehensive spatial–temporal groundwater monitoring and socio‐economic studies of groundwater access and use. The insights provided may inform other fast‐growing coastal megacities in Africa and the wider developing world.This article is categorized under: Science of Water > Water and Environmental Change Engineering Water > Water, Health, and Sanitation Human Water > Value of Water Science of Water > Hydrological Processes

TIO2-MOS2 PAPER BASED MEMBRANE FOR SOLAR EVAPORATION

Clean water scarcity is a critical issue faced by the world. It was caused by insufficient potable water supply and a high cost of water purification systems. As a result, a photothermal evaporator system with the property to absorb light/solar energy and then convert it to heat energy has been rapidly developed. In this work, a solar-driven water evaporation was designed for desalination. The solar evaporator comprises a photothermal molybdenum disulfide-titanium dioxide (MoS2-TiO2) composite layer supported onto a cheap filter paper attached. The filter paper was attached to polystyrene foam for support and cotton thread in the centre of the filter paper for water transportation. MoS2-TiO2 composite was synthesized and coated onto the filter paper using a simple vacuum-assisted method. Before the solar-driven water evaporation testing, the MoS2-TiO2 composite was first characterized using XRD and Raman spectroscopy. The characterization results indicate that MoS2 introduction into the TiO2 structure improved the photosensitivity due to the reduction of the bandgap energy from 3.1 eV for TiO2 to 1.6 eV. The performance of the developed solar evaporator was tested using 35,000 ppm NaCl solution under sunlight for 24 h intermittently. The TiO2-MoS2 solar evaporator was observed to have the highest photothermal ability, with 0.807 kg‧m-2‧h-1 evaporation performance and 55.9 % photothermal efficiency compared to other solar evaporators. This indicated that introducing the photothermal MoS2-TiO2 layer could enhance the solar evaporator performances, making it promising for the desalination application, particularly in impoverished areas with water scarcity.

Determinants of undernutrition among settled pastoralists' children aged 6-59 months in Kenya.

The transition from nomadism to sedentary lifestyle has introduced changes in diets and undernutrition is endemic among settled pastoral households. This study aimed to investigate the underlying factors affecting stunting, underweight, and wasting of children aged 6-59 months in Marsabit County, Kenya. A cross-sectional household survey was conducted in six wards capturing pastoral, agro-pastoral, and urban livelihood practices. Using multistage sampling method, 394 children aged 6-59 months participated with written consent from the caregivers. A pretested questionnaire and anthropometric measures were used during data collection. Population characteristics were summarized into means and proportions, while chi-square and analysis of variance were used to evaluate associations between variables. Backward logistic regressions were used to explore predictors of stunting, underweight, and wasting, respectively. The results showed that the mean Height for Age Z-score, Weight for Age Z-score, and Weight for Height Z-score were -1.51, 1.54, and 1.02, respectively. The prevalence of stunting, underweight, and wasting was 38.1%, 23.0%, and 18.5%, respectively. The age of child, source of drinking water, and waste disposal were some of the main factors influencing stunting among children. In conclusion, the prevalence of undernutrition was high compared to the World Health Organization recommended cutoffs. Water sources hygiene, and caregiver's income were some of the main predictors of undernutrition among children. Development agencies need to focus on the supply of potable water, access to toilet facilities, in addition to nutrition education on hygienic complementary feeding practices among pastoral caregivers.

Study on Response of Evapotranspiration Consumption of Forest and Grass Vegetation to Natural Precipitation in Northwest Loess Plateau

In this paper, the evapotranspiration balance of forest and grass vegetation in the Loess Plateau of Northwest China in different regions was analyzed using 6 indexes in 3 categoriess, namely, evapotranspiration ratio (Ea/Q, Ep/Q), evapotranspiration difference (Q-EA, Q-EP), and actual (potential) water supply ratio (1-Ea/Q, 1-Ep/Q). It is used to objectively reflect the suitability of different types of vegetation in different periods of growth based on precipitation. In another words this suitability reflects the support capacity of natural rainfall to vegetation consumed water through evapotranspiration under the specific climate environment of the Loess Plateau. The results show that: (1) The actual evapotranspiration water consumption of all types of vegetation in this region increased significantly in the first three months of the growth period from April to June, resulting in a relatively high moisture dryness index of vegetation with an average k value of 0.44. The main reason was that natural precipitation was less at this stage, and the gradually rising temperature strengthened the transpiration of most vegetation. The forest was the most stressed. At the end of May and the beginning of June, with the increase of natural precipitation, the average k value of all types of vegetation began to decline. From July to September, due to the flood season in this region, the precipitation increased sharply, and the moisture dryness index was in the lowest range of the whole growth period, and the average k value varied between 0.26 and 0.30 with the lowest value was 0.26 at the end of August and the beginning of September. (2) It is obvious that the water stress of forest is higher than that of shrub and grassland. It is fully indicated that the difference of transpiration caused by the difference of vegetation types leads to the difference of actual evapotranspiration water consumption of different vegetation types.

Review on recent advancements of 2D MXene-based nanostructures on different possible approaches for wastewater treatment

In this review, a brief perspective of MXene (since 2011) with recent research for new and advanced applications for wastewater treatments through various approaches have been discussed. Current information’s about MXenes are summarized to fully understand their nature, promising properties and reduce the challenges that have opened the new era of their uses. Primarily, the existing modest problem is the availability of potable water to sustain healthy human-chain and entire ecosystem, as contaminated water has harsh consequences and poses serious threats to human-health worldwide. In the current stage, supply of potable water for society with cheap and low-cost technology has become the key requirement for the growing economy. Efficient techniques to remove several contaminants (including dyes, heavy metal ions, pharmaceutical or organic products) from wastewater have been transformed gradually to mitigate this scarcity. In this direction, MXene based nanostructures have become a promising material for the wastewater treatment. These structures have unique hydrophilicity, high surface area, a good photocatalytic activity, and wonderful adsorption capacity for contaminates. Numerous advanceshavebeen observed in the optimized rational designs of MXene-derived nanocomposites and their applications in wastewater purification. Hence, timely updates are necessary to emphasize on toxic removals and characterizations including merits and demerits of these MXene-based nanostructures. Thus, this study summarizes the guidelines for the synthesis and applications of MXene-based nanocomposites in wastewater purification, which may stimulate the scientific community to develop a variety of MXene-derived nanostructures with well-defined structures, constitution, and enhanced physicochemical properties for effectively removal of noxious pollutants from wastewater using cost-effective and feasible techniques.

Heavy Metal Ion Adsorbent in Aqueous Solution: A Review on Chitosan and Chitosan Composites

One prominent contributor to environmental degradation is the presence of heavy metal ions, which are commonly introduced into ecosystems through diverse channels, including mining operations, paint manufacturing, battery production, and agricultural practises. The unprocessed waste from these industries typically undergoes direct discharge into rivers and seas, thereby adversely influencing the potable water supply and marine ecosystem. This results in the accumulation of heavy metals within living organisms and subsequent environmental degradation that poses a significant risk to human health, as their prolonged consumption can harm various organs and the nervous system. Therefore, the United States Environmental Protection Agency (US-EPA) and the World Health Organisation (WHO) have established stringent regulations regarding the allowable levels of heavy metal intake, particularly concerning potable water consumption. The imperative lies in surmounting this challenge by discovering the optimal technique for extracting heavy metals. This paper examines the primary methods of eliminating heavy metal ions using chitosan-based materials. Specifically, the methods under scrutiny include electrocoagulation (E.C.), bioremediation, ion-exchange, membrane filtration (purification), and adsorption. Adsorption, as a highly efficient method, presents itself as a viable strategy for the remediation of dyes in textile wastewater due to its advantageous characteristics. Notably, this approach obviates the need for extensive spatial requirements and exhibits a commendably swift treatment duration. Chitosan exhibits promising adsorptive characteristics owing to its advantageous physical attributes, including crystalline structure, porous nature, and particle dimensions, all of which synergistically enhance the adsorption capacity of chitosan. Research findings indicate that the adsorption characteristics of chitosan are subject to variation contingent upon the distinct heavy metal ions under consideration and the specific experimental parameters employed. Hence, optimising these parameters becomes imperative to attain enhanced chitosan adsorption capabilities for heavy metal ion removal.

There is no place to go in “America's Finest City”: Basic sanitation deprivation is punishment in San Diego, California, USA

Safe and consistent access to water, sanitation, and hygiene (WaSH) resources is an internationally recognized human right. Yet in the U.S., access to public toilets, handwashing facilities, potable water, and menstrual supplies is grimly limited, especially for unhoused people. This article develops the concept of “sanitation justice” and argues for its urgent consideration alongside calls for racial, gender, social, and environmental justice. We advance this argument via a case study analyzing three novel data sources on WaSH access in San Diego, California's second-largest city, with a focus on public restrooms: geospatial data on facility locations, infrastructure assessments, and interviews with unhoused people on their restroom needs and challenges. We present a conceptual model, informed by the prior literature and our data, for visualizing how deliberate sanitation deprivation in the U.S. urban environment functions as a punishment regime inflicted on city residents, unhoused residents especially, to the detriment of public health and safety. As our data show, WaSH access is the most basic way governments can support not only public health but also social and economic mobility. We conclude with a vision of sanitation justice that centers the voices of those most affected by sanitation deprivation.

Physical quality and antibiotic susceptibility profile of <i>Escherichia coli</i> isolates from roof-harvested rainwater: A microcosm study

Owing to the inadequate supply of potable water in rural settlements in developing countries, roof-harvested rainwater (RHRW) has been favoured as an alternative source of water supply. The present study investigated the physical characteristics and microbial quality of 10 RHRW samples collected from storage tanks in Ikwo community of Ebonyi State, Nigeria. Triplicate water sampling was performed over a 3-month sampling regime. Onsite determination of odour, colour, pH and temperature, and isolation and enumeration of Escherichia coli were done using standard procedures. The identity of the isolates was confirmed using molecular techniques, and the susceptibility of the isolates to 11 antibiotics was determined following the Kirby-Bauer disc diffusion assay. Multiple antibiotic resistance phenotypes and indices (MARPs and MARI) were equally determined. Our findings revealed that the RHRWs had unobjectionable odour and were colourless. Across the 3-month o sampling, the pH ranged from 6.9 to 7.8 while the temperature was between 24 °C and 29 C. While E. coli was absent in samples E (September), H (August and October) and J (August, September, and October), the highest E. coli count in August, September, and October was 37, 32, and 38 cfu/100 mL, respectively. The antibiotic susceptibility test on 40 E. coli isolates showed high resistance to ampicillin (100%), aztreonam (98%), cefotetan (97%), nitrofurantoin (90%), imipenem (83%), streptomycin (72%), and ertapenem (69%). Interestingly, the ighest MARP, 11 (AK/S/ETP/IMI/OFX/NOR/AMP/CTT/ATM/F/TE) (sample B), and the least, 4 (IMI/AMP/CTT/ATM) were recorded in samples B and D, respectively in September. MARI was from 0.42 to 1.00. The physical parameters conform with WHO standards, on the other hand, detection of E. coli poses risks of water-borne illness(es) and transmission of antimicrobial resistance. Hence stringent measures including proper treatment, sanitation and hygiene are advocated to safeguard the health of dwellers who depend on this water source for daily life activities.

Vulnerability Analysis of Potable Water Supply and Sanitation Services in The Municipality of Rio Branco-Acre Applied to The Sunshine Regulation Model

Resumo estruturado – Objetivo: avaliar o desempenho e a vulnerabilidade dos serviços de água e esgoto no município de Rio Branco, Acre, no período de 2018 a 2019, aplicados ao modelo Sunshine. Referencial teórico: A realidade do saneamento básico no Brasil é marcada por desigualdades regionais e sociais na prestação dos serviços de abastecimento de água potável e sistema de esgoto. A fim de melhorar o acesso aos serviços de Saneamento Básico no Brasil, foi estabelecido o Novo Marco Regulatório, sancionado pela Lei nº 14.026/2020, atualizando a Lei Federal. A cidade de Rio Branco é marcada por um forte processo de diversificação da produção rural e de infraestrutura urbana marcando, fortemente, a dinâmica de implementação dos serviços de saneamento na cidade. Método: Foram utilizadas informações do primeiro ciclo de auditoria, conforme metodologia ACERTAR, dos serviços prestados pelo então Departamento Estadual de Água e Saneamento do Acre - DEPASA. A avaliação ocorreu com base nos indicadores de desempenho, em suas dimensões de acesso, eficiência e qualidade. Resultados e conclusão: As informações obtidas através dos indicadores analisados revelaram que a prestação dos serviços de água e esgoto em todas as dimensões avaliadas é insatisfatória, muito aquém do que se pretende para a universalização dos serviços, necessitando de um aperfeiçoamento no que tange aos mecanismos e procedimentos de avaliação e monitoramento dos serviços prestados.

Empowered machine learning algorithm to identify sustainable groundwater potential zone map in Jashore District, Bangladesh

Groundwater is a crucial natural resource that supplies potable water to the local population in Jashore, Bangladesh. In recent years, the district has experienced groundwater scarcity during the summer season, significantly affecting both domestic and agricultural usage, thereby impacting the local populace. However, accurately assessing its availability and quality remains a challenge. Our objective was to identify groundwater prospect zones in Jashore and provide valuable insights for management and decision-making through Explainable Artificial Intelligence (XAI). This study used 15 groundwater conditioning factors for potential zone mapping. The k-Nearest Neighbors (KNN), Neural Networks (NNET), Gradient Boosting Machines (GBM), Random Forest (RF), and Support Vector Machines (SVM) models were applied to assess groundwater suitability, resulting in the identification of five distinct areas with different levels of potential. The areas with very low suitability covered 39.37, 14.95, 107.23, 291.59, and 300.24 km2, while areas with very high suitability covered 1255.61, 969.49, 1221.99, 1958.85, and 1211.03 km2, respectively. Notably, the RF and NNET models exhibited higher accuracy, with Area Under Curve (AUC) values of 90%. The KNN, GBM, and SVM models achieved AUC values of 85%, 86%, and 88% respectively. The study reveals that the northeastern region has the greatest groundwater potential, while the southern and southwestern regions have lower capacities. The researcher's also utilized Partial Dependence Plots (PDP) technique, to analyze parameter behavior in predicting groundwater suitability. This approach provided valuable insights into the impact of various factors on groundwater potential, aiding management decisions. The study findings inform to policymakers and water resource managers in Jashore, enabling sustainable groundwater management by identifying high-potential areas. This knowledge optimizes resource allocation, ensuring sufficient supply for sustainable development.

Green synthesis of nanocomposite based on magnetic hydroxyapatite using Falcaria vulgaris Bernh leaf extract to remove tartrazine dye from aqueous solution

To mitigate the adverse impacts of water pollution, the application of nanotechnology in dye removal and by-product reduction has the potential to establish a sustainable potable water supply. For these methodologies, the materials must involve exhibit qualities such as simplicity, high efficiency, eco-friendliness, reusability, and affordability. This study presents a novel porous magnetic hydroxyapatite nanocomposite coated with zinc oxide (Fe3O4@HAP@ZnO). Initially, zinc oxide nanoparticles were generated via a green synthesis method, where a zinc nitrate solution was combined with an aqueous extract from the Falcaria Vulgaris Bernh plant, serving as a reducing and stabilizing agent. These were then coated onto the magnetic hydroxyapatite.Verification of successful nanocomposite synthesis was obtained through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray spectroscopy (EDS), vibrating-sample magnetometer (VSM), High-resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM) images further substantiated these results. The synthesized nanocomposite exhibited a normal particle size distribution of approximately 89 nm. To achieve maximal decolorization efficiency, pertinent parameters were scrutinized and optimized through a detailed experimental design. Under optimal conditions, the nanocomposite's ability to decolorize tartrazine dye in an aqueous solution was evaluated. Remarkably, the highest observed efficiency approached 98 %, employing 0.07 g of the nanocomposite at 90 degrees Celsius, pH 6.4, over a span of 30 min. Further exploration of the nanocomposite's reusability revealed it could sustain an efficiency exceeding 90 % across 11 successive cycles, boasting an impressive capacity of 1398 (mgg-1).

Analysis of Land Use Change and Hydrogeological Parameters in the Andean Semiarid Region of Ecuador

Access to freshwater in developing regions remains a significant concern, particularly in arid and semiarid areas with limited annual precipitation. Groundwater, a vital resource in these regions, faces dual threats—climate change and unsustainable exploitation. This study analyzes changes in land use, vegetation cover, and hydrogeological parameters in Catacocha parish, situated in the southern Ecuadorian Andes region. The methodology incorporates the integration of data from the Paltas Municipality, Ministerio del Ambiente, Agua y Transición Ecológica—MAATE—and Instituto Geográfico Militar—IGM. Utilizing GIS tools, vegetation analysis is combined with a comparative assessment of discharge data spanning from 2000 to 2022. The data from the MAATE and IGM play an instrumental role in evaluating alterations in vegetation cover across the years. The study also examines the characteristic curves of the wells and their coefficient of storage. Additionally, it assesses the role of vegetation in facilitating infiltration and explores the potential relationship with precipitation patterns in the study area. In semiarid regions, prioritizing the management of natural vegetation is essential, either through conservation projects or reforestation plans throughout the year. Moreover, population emigration has revitalized land use, reserving specific areas for conservation. The transformation observed in the wells supplying the parish of Catacocha and its vegetation cover from 2000 to 2022 serves as a demonstration of this change. Discharge data remain essential for monitoring variations in well discharge and ensuring a consistent daily supply of potable water.

Water security consequences of the Russia-Ukraine war and the post-war outlook

Russian forces have destroyed one-third of Ukraine’s freshwater storage since February 2022 to 2024. Potable, industrial and irrigation water supplies have been cut across the south and east of the country. Overall, social, economic and ecological damages are estimated in the tens of billions of $US, while the loss of Ukraine’s economic potential and necessary investments in restoration reach $600 billion. We consider the current eco-economic efficiency of irrigated crops, as well as damage to commercial and recreational fisheries including losses of littoral areas and spawning grounds. Alternative water supplies for the war-torn regions by construction of wells to tap groundwater are presented and justified; various scientific opinions and approaches to ecosystem management and options for the future reconstruction of the Kakhovka Reservoir are discussed; and, finally, strategic development options for the water sector are considered to ensure water security in the post-war development period.