scholarly journals Global potential for harvesting drinking water from air using solar energy

Nature ◽  
2021 ◽  
Vol 598 (7882) ◽  
pp. 611-617
Author(s):  
Jackson Lord ◽  
Ashley Thomas ◽  
Neil Treat ◽  
Matthew Forkin ◽  
Robert Bain ◽  
...  
Keyword(s):  
Drinking Water ◽  
Technological Development ◽  
Google Earth ◽  
Water Harvesting ◽  
Atmospheric Water ◽  
Tropical Regions ◽  
Global Challenge ◽  
Trade Offs ◽  
Sorbent Materials ◽  
The Impact

AbstractAccess to safely managed drinking water (SMDW) remains a global challenge, and affects 2.2 billion people1,2. Solar-driven atmospheric water harvesting (AWH) devices with continuous cycling may accelerate progress by enabling decentralized extraction of water from air3–6, but low specific yields (SY) and low daytime relative humidity (RH) have raised questions about their performance (in litres of water output per day)7–11. However, to our knowledge, no analysis has mapped the global potential of AWH12 despite favourable conditions in tropical regions, where two-thirds of people without SMDW live2. Here we show that AWH could provide SMDW for a billion people. Our assessment—using Google Earth Engine13—introduces a hypothetical 1-metre-square device with a SY profile of 0.2 to 2.5 litres per kilowatt-hour (0.1 to 1.25 litres per kilowatt-hour for a 2-metre-square device) at 30% to 90% RH, respectively. Such a device could meet a target average daily drinking water requirement of 5 litres per day per person14. We plot the impact potential of existing devices and new sorbent classes, which suggests that these targets could be met with continued technological development, and well within thermodynamic limits. Indeed, these performance targets have been achieved experimentally in demonstrations of sorbent materials15–17. Our tools can inform design trade-offs for atmospheric water harvesting devices that maximize global impact, alongside ongoing efforts to meet Sustainable Development Goals (SDGs) with existing technologies.

scholarly journals FEATURES OF GEODETIC MAINTENANCE FOR WATER SUPPLY PROJECTS IN AZERBAIJAN

2018 ◽  
Vol XLII-5 ◽  
pp. 63-67
Author(s):  
M. H. Gojamanov ◽  
C. Z. Gurbanov
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Coordinate System ◽  
Detailed Examination ◽  
Google Earth ◽  
Drinking Water Supply ◽  
Sewerage System ◽  
Large Cities ◽  
Geodetic Measurements ◽  
The Impact

<p><strong>Abstract.</strong> Drinking water supply and sewerage system designing and reconstruction projects are being extensively conducted in Azerbaijan Republic. During implementation of such projects, collecting large amount of information about the area and detailed investigations are crucial. Joint use of the aerospace monitoring and GIS play an essential role for the studies of the impact of environmental factors, development of the analytical information systems and others, while achieving the reliable performance of the existing and designed major water supply pipelines, as well as construction and exploitation of the technical installations. With our participation the GIS has been created in “Azersu” OJSC that includes systematic database of the drinking water supply and sewerage system, and rain water networks to carry out necessary geo information analysis. The system software was developed based on “Microstation” platform, which identifies the coordinate system and cartographic projection along with the geo-referencing through direct connection to Google Earth platform.</p><p> Should be mentioned that, in the country, specifically in large cities (i.e. Baku, Ganja, Sumqait, etc.,) drinking water supply pipelines cross regions with different physico-geographical conditions, geo-morphological compositions and seismotectonics. Therefore, constant control of the plan-height positioning, geodetic measurements for the detailed examination of the dynamics, repetition of the geodetic measurements for certain time intervals, or in other words regular monitoring is very important. During geodetic monitoring using the GIS has special significance. Given that, collecting geodetic monitoring measurements of the main pipelines on the same coordinate system and processing these data on a single GIS system allows the implementation of overall assessment of plan-height state of major pipes.</p>

scholarly journals Assessing the Impact of a Risk-Based Intervention on Piped Water Quality in Rural Communities: The Case of Mid-Western Nepal

2018 ◽  
Vol 15 (8) ◽  
pp. 1616 ◽  
Author(s):  
Dorian Tosi Robinson ◽  
Ariane Schertenleib ◽  
Bal Kunwar ◽  
Rubika Shrestha ◽  
Madan Bhatta ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Rural Communities ◽  
Rural Areas ◽  
Universal Access ◽  
Water Safety ◽  
Household Water Treatment ◽  
Microbial Water Quality ◽  
Global Challenge ◽  
The Impact

Ensuring universal access to safe drinking water is a global challenge, especially in rural areas. This research aimed to assess the effectiveness of a risk-based strategy to improve drinking water safety for five gravity-fed piped schemes in rural communities of the Mid-Western Region of Nepal. The strategy was based on establishing community-led monitoring of the microbial water quality and the sanitary status of the schemes. The interventions examined included field-robust laboratories, centralized data management, targeted infrastructure improvements, household hygiene and filter promotion, and community training. The results indicate a statistically significant improvement in the microbial water quality eight months after intervention implementation, with the share of taps and household stored water containers meeting the international guidelines increasing from 7% to 50% and from 17% to 53%, respectively. At the study endline, all taps had a concentration of <10 CFU Escherichia coli/100 mL. These water quality improvements were driven by scheme-level chlorination, improved hygiene behavior, and the universal uptake of household water treatment. Sanitary inspection tools did not predict microbial water quality and, alone, are not sufficient for decision making. Implementation of this risk-based water safety strategy in remote rural communities can support efforts towards achieving universal water safety.

scholarly journals Global Potential for Harvesting Drinking Water from Air using Solar Energy

2021 ◽  
Author(s):  
Jackson Lord ◽  
Ashley Thomas ◽  
Neil Treat ◽  
Matthew Forkin ◽  
Robert Bain ◽  
...  
Keyword(s):  
Drinking Water ◽  
Solar Energy ◽  
High Performance ◽  
High Sensitivity ◽  
Climatic Conditions ◽  
Google Earth ◽  
Climate Data ◽  
Operational Parameters ◽  
Middle Income ◽  
Tropical Regions

Abstract Access to safely managed drinking water (SMDW) remains a global challenge affecting 2.2 billion people [1,2]. Atmospheric Water Harvesting (AWH) can accelerate progress through decentralized production of liquid water from air [3]. A solar-driven device capable of active daytime operation can unlock design advantages through continuous cycling [4,5] and could be sized to household scale, though lower daytime humidity raises concerns about widespread suitability [6–8]. However, no methodological analysis has been conducted to characterize the global potential of daytime AWH [9] despite the favorable climatic conditions of low and middle-income countries (LMICs) in the tropical regions where two-thirds of people without SMDW services live [2]. Here we present a computing toolset built with Google Earth Engine to calculate the global potential of solar-driven AWH operating in continuous mode. By mapping time-averaged, contemporaneous occurrence of incident solar energy and available water vapor using a climate timeseries and official estimates of the geographic distribution of water service globally, we show that a significant portion of the world’s population without SMDW reside in a climate suitable for a device to serve their daily drinking water requirements. A device functional to relative humidity 30% can serve 1 billion in need by running 4-5 h/day above 600 W/m2, operational parameters which have been approached experimentally in recent prototypes using novel sorbents [10–17]. Steep gradients of AWH suitability in the Sahel of Africa indicate high sensitivity of design criteria to market serviceability. This global assessment of solar-driven AWH, unlocked by accessible high-performance geospatial computing [18] and climate data assimilated at high spatio-temporal resolution, can enable household-scale device innovation and accelerate the progress towards global goals.

scholarly journals Hydrogels: Next Generation Atmospheric Water Harvesting Materials

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Rohan S. Dassanayake ◽  
Nilmini Renuka
Keyword(s):  
Drinking Water ◽  
Water Scarcity ◽  
Water Harvesting ◽  
Atmospheric Moisture ◽  
Next Generation ◽  
Atmospheric Water ◽  
Clean Drinking Water ◽  
Global Water

Hydrogels could harvest atmospheric moisture to produce clean drinking water mitigating the global water scarcity woes in future.

scholarly journals Rooftop Rain Water Harvesting Technology and Women Time Allocation in District Bagh and Battagram Pakistan.

2011 ◽  
Vol 50 (4II) ◽  
pp. 459-470 ◽  
Author(s):  
Ajaz Mustafa ◽  
Usman Mustafa ◽  
Mahmood Khalid
Keyword(s):  
Drinking Water ◽  
Time Allocation ◽  
Rainwater Harvesting ◽  
Rain Water ◽  
Least Square ◽  
Water Harvesting ◽  
Safe Drinking Water ◽  
Human Beings ◽  
Rain Water Harvesting ◽  
The Impact

Water is essential requirement of life and its accessibility is the basic right of all human beings. Safe drinking water is an essential component of primary health. It plays a vital role in livelihood, food security and sustainable development. Rooftop Rainwater Harvesting Technology (RRWH) is a best alternative approach to conserve and supply water. Especially, it is crucial in seismically sensitive, geographically uneven, and countryside areas. A large majority of population in Pakistan is living in areas, where access to safe drinking water is very serious issue. In these areas most vulnerable segment of population is women because they are the ones who have to fetch water from far flung areas for their daily consumption. In order to resolve the issue of water in Pakistan, a number of public and private agencies are working in this field. Different approaches, techniques, and practices are being adopted to address this issue. Present study evaluates the impact of RRWH technology with special reference to women time allocation in Bagh and Battagram districts of Pakistan. Analyses were carried out using Ordinary Least Square (OLS) technique to quantify the results. The results reveal that RRWH technology is viable, time saving, women friendly, and sustainable source of safe drinking water supply, especially in seismically sensitive, geographically uneven, and countryside areas of Pakistan. JEL classification: O13, Q25, Q56, Q58, R28 Keywords: Rooftop Rain Water Harvesting: Safe Drinking Water, Seismically Sensitive, Geographically Uneven, and Countryside: Women, AJK and KP, Pakistan.

Secular stagnation in the modern world

2018 ◽  
pp. 125-141 ◽  
Author(s):  
S. M. Drobyshevsky ◽  
P. V. Trunin ◽  
A. V. Bozhechkova
Keyword(s):  
Public Debt ◽  
Capital Accumulation ◽  
Technological Development ◽  
Japanese Economy ◽  
Modern World ◽  
Key Factors ◽  
Destruction Process ◽  
Secular Stagnation ◽  
The Impact

The paper studies the factors of secular stagnation. Key factors of long-term slowdown in economic growth include the slowdown of technological development, aging population, human capital accumulation limits, high public debt, creative destruction process violation etc. The authors analyze key theoretical aspects of long-term stagnation and study the impact of these factors on Japanies economy. The authors conclude that most of the factors have significant influence on the Japanese economy for recent decades, but they cannot explain all dynamics. For Russia, on the contrary, we do not see any grounds for considering the decline in the economy since 2013 as an episode of secular stagnation.

scholarly journals Evaluating Forest Cover and Fragmentation in Costa Rica with a Corrected Global Tree Cover Map

2020 ◽  
Vol 12 (19) ◽  
pp. 3226
Author(s):  
Daniel Cunningham ◽  
Paul Cunningham ◽  
Matthew E. Fagan
Keyword(s):  
Costa Rica ◽  
Forest Cover ◽  
Agricultural Land ◽  
Forest Area ◽  
Tree Cover ◽  
Agricultural Crop ◽  
Forest Change ◽  
Alos Palsar ◽  
Tropical Regions ◽  
The Impact

Global tree cover products face challenges in accurately predicting tree cover across biophysical gradients, such as precipitation or agricultural cover. To generate a natural forest cover map for Costa Rica, biases in tree cover estimation in the most widely used tree cover product (the Global Forest Change product (GFC) were quantified and corrected, and the impact of map biases on estimates of forest cover and fragmentation was examined. First, a forest reference dataset was developed to examine how the difference between reference and GFC-predicted tree cover estimates varied along gradients of precipitation and elevation, and nonlinear statistical models were fit to predict the bias. Next, an agricultural land cover map was generated by classifying Landsat and ALOS PalSAR imagery (overall accuracy of 97%) to allow removing six common agricultural crops from estimates of tree cover. Finally, the GFC product was corrected through an integrated process using the nonlinear predictions of precipitation and elevation biases and the agricultural crop map as inputs. The accuracy of tree cover prediction increased by ≈29% over the original global forest change product (the R2 rose from 0.416 to 0.538). Using an optimized 89% tree cover threshold to create a forest/nonforest map, we found that fragmentation declined and core forest area and connectivity increased in the corrected forest cover map, especially in dry tropical forests, protected areas, and designated habitat corridors. By contrast, the core forest area decreased locally where agricultural fields were removed from estimates of natural tree cover. This research demonstrates a simple, transferable methodology to correct for observed biases in the Global Forest Change product. The use of uncorrected tree cover products may markedly over- or underestimate forest cover and fragmentation, especially in tropical regions with low precipitation, significant topography, and/or perennial agricultural production.

scholarly journals Impact of Community-Led Total Sanitation and Hygiene on Prevalence of Diarrheal Disease and Associated Factors among Under-Five Children: A Comparative Cross-Sectional Study in Selected Woredas of Gamo Gofa Zone, Southern Ethiopia

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Agune Ashole Alto ◽  
Wanzahun Godana ◽  
Genet Gedamu
Keyword(s):  
Drinking Water ◽  
Diarrheal Disease ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Under Five ◽  
Under Five Children ◽  
Sanitation And Hygiene ◽  
The Impact ◽  
Gamo Gofa

Background. Diarrheal diseases are still one of the major causes of morbidity in under-five children in sub-Saharan Africa. In Ethiopia, diarrhea is responsible for 9% of all deaths and is the major cause of under-five mortality. Objective. To assess the impact of community-led total sanitation and hygiene on the prevalence of diarrheal disease and factors associated among under-five children in Gamo Gofa Zone. Methods. Community-based comparative cross-sectional study design was used to compare the impact of community-led total sanitation and hygiene intervention on under-five diarrheal disease. Multistage sampling method was employed. The data were collected by using pretested structured questionnaires. Data quality was ensured by daily supervision completeness and consistency. The data were coded, entered, and cleaned by using Epi Info version 7 and were analyzed by using SPSS version 20. Bivariate and multivariable analyses were carried out by using binary logistic regression. Significance was declared by using p value of <0.05 and AOR with 95% confidence intervals. Results. The response rate of this study was 93.3%. The overall diarrhea prevalence was 27.5% (CI = (24.06, 30.97)) which was 18.9% (CI = (14.94, 23.2)) in implemented and 36.2%. (CI = (30.41, 41.59)) in nonimplemented woredas. Children whose age was between 12 and 23 months (AOR = 1.6) and greater than 24 months (AOR = 5), availability of handwashing facilities (AOR = 4), disposal of waste in open field (AOR = 9.7), unimproved source of drinking water (AOR = 6.5), using only water for handwashing (AOR = 6), children who started complementary feeding less than 6 months (AOR = 5.6) and greater than 6 months (AOR = 5.2), and utensils used to feed children such as bottle (AOR = 3.9) were the factors positively associated with diarrhea. Conclusion. The overall prevalence of under-five diarrhea was 27.5%. The prevalence was low in CLTSH woredas as compared with non-CLTSH woredas. The study showed that handwashing facility, using only water for handwashing, open refuse disposal, and unimproved source of drinking water among under-five had a statistically significant association with diarrhea occurrence in CLTSH nonimplemented areas. Integrated efforts are needed from the Ministry of Health together with the WASH Project in improving drinking water, handwashing facilities, and solid waste disposal practices.

scholarly journals Carbon Dynamics in the Northeastern Qinghai–Tibetan Plateau from 1990 to 2030 Using Landsat Land Use/Cover Change Data

2020 ◽  
Vol 12 (3) ◽  
pp. 528 ◽  
Author(s):  
Jingye Li ◽  
Jian Gong ◽  
Jean-Michel Guldmann ◽  
Shicheng Li ◽  
Jie Zhu
Keyword(s):  
Land Use ◽  
Tibetan Plateau ◽  
Carbon Storage ◽  
Sharp Decrease ◽  
Total Carbon ◽  
Qinghai Lake ◽  
Lake Basin ◽  
Ecosystem Carbon ◽  
Trade Offs ◽  
The Impact

Land use/cover change (LUCC) has an important impact on the terrestrial carbon cycle. The spatial distribution of regional carbon reserves can provide the scientific basis for the management of ecosystem carbon storage and the formulation of ecological and environmental policies. This paper proposes a method combining the CA-based FLUS model and the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model to assess the temporal and spatial changes in ecosystem carbon storage due to land-use changes over 1990–2015 in the Qinghai Lake Basin (QLB). Furthermore, future ecosystem carbon storage is simulated and evaluated over 2020–2030 under three scenarios of natural growth (NG), cropland protection (CP), and ecological protection (EP). The long-term spatial variations in carbon storage in the QLB are discussed. The results show that: (1) Carbon storage in the QLB decreased at first (1990–2000) and increased later (2000–2010), with total carbon storage increasing by 1.60 Tg C (Teragram: a unit of mass equal to 1012 g). From 2010 to 2015, carbon storage displayed a downward trend, with a sharp decrease in wetlands and croplands as the main cause; (2) Under the NG scenario, carbon reserves decrease by 0.69 Tg C over 2020–2030. These reserves increase significantly by 6.77 Tg C and 7.54 Tg C under the CP and EP scenarios, respectively, thus promoting the benign development of the regional ecological environment. This study improves our understanding on the impact of land-use change on carbon storage for the QLB in the northeastern Qinghai–Tibetan Plateau (QTP).

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