Recycling of Greywater (GW) through Natural Adsorbents

2018 ◽  
Vol 7 (3.12) ◽  
pp. 1140 ◽  
Author(s):  
Mukesh Chandra Kestwal ◽  
Ravi Kumar Patel ◽  
Benoit Teychene ◽  
Prasenjit Mondal ◽  
Sukdeb Pal ◽  
...  
Keyword(s):  
Water Availability ◽  
Water Scarcity ◽  
Secondary Treatment ◽  
Valuable Resource ◽  
Simple Method ◽  
Household Level ◽  
Natural Adsorbent ◽  
Minimum Change ◽  
Natural Adsorbents ◽  
Individual Household

Reuse of water has been a popular choice toward balancing water scarcity and managing water availability in defined areas.  GW which can be defined as the wastewater that comprises water from baths, showers etc, when managed and treated properly could be valuable resource for sectors like agricultural and horticultural. GW is one of the best option if treated and if not, it will mix with the sewage stream. It is possible to intercept this GW at the household level using minimum change in design, and with the primary and secondary treatment it can be recycled for garden washing, flushing and many purposes. In the present work, GW from student accommodation were collected, characterized and treated through series of natural adsorbent. Various parameters such as TDS, pH, Turbidity, BOD,COD, amount of nitrate and phosphorus were measured and it was found that most of the parameters were considerably in range after treatment.  A simple method has been proposed that may be applied at individual household level. 

scholarly journals How downstream sub-basins depend on upstream inflows to avoid scarcity: typology and global analysis of transboundary rivers

2018 ◽  
Vol 22 (5) ◽  
pp. 2795-2809 ◽  
Author(s):  
Hafsa Ahmed Munia ◽  
Joseph H. A. Guillaume ◽  
Naho Mirumachi ◽  
Yoshihide Wada ◽  
Matti Kummu
Keyword(s):  
Water Stress ◽  
Water Use ◽  
Water Availability ◽  
Water Scarcity ◽  
Management Practices ◽  
Global Analysis ◽  
Water Shortage ◽  
River Basins ◽  
Analytical Framework ◽  
Available Water

Abstract. Countries sharing river basins are often dependent upon water originating outside their boundaries; meaning that without that upstream water, water scarcity may occur with flow-on implications for water use and management. We develop a formalisation of this concept drawing on ideas about the transition between regimes from resilience literature, using water stress and water shortage as indicators of water scarcity. In our analytical framework, dependency occurs if water from upstream is needed to avoid scarcity. This can be diagnosed by comparing different types of water availability on which a sub-basin relies, in particular local runoff and upstream inflows. At the same time, possible upstream water withdrawals reduce available water downstream, influencing the latter water availability. By developing a framework of scarcity and dependency, we contribute to the understanding of transitions between system regimes. We apply our analytical framework to global transboundary river basins at the scale of sub-basin areas (SBAs). Our results show that 1175 million people live under water stress (42 % of the total transboundary population). Surprisingly, the majority (1150 million) of these currently suffer from stress only due to their own excessive water use and possible water from upstream does not have impact on the stress status – i.e. they are not yet dependent on upstream water to avoid stress – but could still impact on the intensity of the stress. At the same time, 386 million people (14 %) live in SBAs that can avoid stress owing to available water from upstream and have thus upstream dependency. In the case of water shortage, 306 million people (11 %) live in SBAs dependent on upstream water to avoid possible shortage. The identification of transitions between system regimes sheds light on how SBAs may be affected in the future, potentially contributing to further refined analysis of inter- and intrabasin hydro-political power relations and strategic planning of management practices in transboundary basins.

Water Scarcity and Conflict Between Upstream and Downstream Riparian Countries

2021 ◽  
Vol 07 (03) ◽  
pp. 2150012
Author(s):  
Sahar Farid Yousef
Keyword(s):  
Water Availability ◽  
Water Scarcity ◽  
Water Allocation ◽  
Allocation Problem ◽  
The Other ◽  
Backward Induction ◽  
Transboundary River ◽  
Militarized Conflicts ◽  
The Future ◽  
Water Scarce

More than one-quarter of the world’s population lives in water-scarce areas, while most countries share at least one transboundary river. If water scarcity is this prevalent, should we expect riparian countries to fight over the water allocation of shared rivers? To answer this question, I develop a modified one-shot three-stage river-sharing game where countries can resort to force to solve their water allocation problem. Using backward induction, I solve for the probability of the downstream country initiating conflict against the upstream country and the likelihood of the latter responding with force to the former’s hostile actions. I test the model empirically using a set of all upstream–downstream riparian dyads with available data from AQUASTAT and the Correlates of War Project for the years 1960–2010. The main contribution of this paper is that it demonstrates how upstream and downstream riparian countries differ in their decision to use force against the other country when experiencing water scarcity. I find that water scarcity increases the likelihood of the downstream country initiating the conflict, but it has no effect on the upstream country’s likelihood of responding with force. If history is a predictor of the future, then the results imply that as more riparian countries become water-scarce, militarized conflicts between upstream and downstream countries are likely to increase, especially if there is heterogeneity in water availability between the riparian dyad.

scholarly journals Modelling global water stress of the recent past: on the relative importance of trends in water demand and climate variability

2011 ◽  
Vol 15 (12) ◽  
pp. 3785-3808 ◽  
Author(s):  
Y. Wada ◽  
L. P. H. van Beek ◽  
M. F. P. Bierkens
Keyword(s):  
Water Stress ◽  
Climate Variability ◽  
Water Use ◽  
Extreme Events ◽  
Water Availability ◽  
Water Scarcity ◽  
Water Demand ◽  
Developing Economies ◽  
Blue Water ◽  
Global Population

Abstract. During the past decades, human water use has more than doubled, yet available freshwater resources are finite. As a result, water scarcity has been prevalent in various regions of the world. Here, we present the first global assessment of past development of water stress considering not only climate variability but also growing water demand, desalinated water use and non-renewable groundwater abstraction over the period 1960–2001 at a spatial resolution of 0.5°. Agricultural water demand is estimated based on past extents of irrigated areas and livestock densities. We approximate past economic development based on GDP, energy and household consumption and electricity production, which are subsequently used together with population numbers to estimate industrial and domestic water demand. Climate variability is expressed by simulated blue water availability defined by freshwater in rivers, lakes, wetlands and reservoirs by means of the global hydrological model PCR-GLOBWB. We thus define blue water stress by comparing blue water availability with corresponding net total blue water demand by means of the commonly used, Water Scarcity Index. The results show a drastic increase in the global population living under water-stressed conditions (i.e. moderate to high water stress) due to growing water demand, primarily for irrigation, which has more than doubled from 1708/818 to 3708/1832 km3 yr−1 (gross/net) over the period 1960–2000. We estimate that 800 million people or 27% of the global population were living under water-stressed conditions for 1960. This number is eventually increased to 2.6 billion or 43% for 2000. Our results indicate that increased water demand is a decisive factor for heightened water stress in various regions such as India and North China, enhancing the intensity of water stress up to 200%, while climate variability is often a main determinant of extreme events. However, our results also suggest that in several emerging and developing economies (e.g. India, Turkey, Romania and Cuba) some of past extreme events were anthropogenically driven due to increased water demand rather than being climate-induced.

scholarly journals Integrated assessment of global water scarcity over the 21st century under multiple climate change mitigation policies

2014 ◽  
Vol 18 (8) ◽  
pp. 2859-2883 ◽  
Author(s):  
M. I. Hejazi ◽  
J. Edmonds ◽  
L. Clarke ◽  
P. Kyle ◽  
E. Davies ◽  
...  
Keyword(s):  
Climate Change ◽  
21St Century ◽  
Water Availability ◽  
Water Scarcity ◽  
Carbon Tax ◽  
Assessment Model ◽  
Baseline Scenario ◽  
Water Demands ◽  
Global Water ◽  
Mitigation Policies

Abstract. Water scarcity conditions over the 21st century both globally and regionally are assessed in the context of climate change and climate mitigation policies, by estimating both water availability and water demand within the Global Change Assessment Model (GCAM), a leading community-integrated assessment model of energy, agriculture, climate, and water. To quantify changes in future water availability, a new gridded water-balance global hydrologic model – namely, the Global Water Availability Model (GWAM) – is developed and evaluated. Global water demands for six major demand sectors (irrigation, livestock, domestic, electricity generation, primary energy production, and manufacturing) are modeled in GCAM at the regional scale (14 geopolitical regions, 151 sub-regions) and then spatially downscaled to 0.5° × 0.5° resolution to match the scale of GWAM. Using a baseline scenario (i.e., no climate change mitigation policy) with radiative forcing reaching 8.8 W m−2 (equivalent to the SRES A1Fi emission scenario) and three climate policy scenarios with increasing mitigation stringency of 7.7, 5.5, and 4.2 W m−2 (equivalent to the SRES A2, B2, and B1 emission scenarios, respectively), we investigate the effects of emission mitigation policies on water scarcity. Two carbon tax regimes (a universal carbon tax (UCT) which includes land use change emissions, and a fossil fuel and industrial emissions carbon tax (FFICT) which excludes land use change emissions) are analyzed. The baseline scenario results in more than half of the world population living under extreme water scarcity by the end of the 21st century. Additionally, in years 2050 and 2095, 36% (28%) and 44% (39%) of the global population, respectively, is projected to live in grid cells (in basins) that will experience greater water demands than the amount of available water in a year (i.e., the water scarcity index (WSI) > 1.0). When comparing the climate policy scenarios to the baseline scenario while maintaining the same baseline socioeconomic assumptions, water scarcity declines under a UCT mitigation policy but increases with a FFICT mitigation scenario by the year 2095, particularly with more stringent climate mitigation targets. Under the FFICT scenario, water scarcity is projected to increase, driven by higher water demands for bio-energy crops.

scholarly journals APPLICATION OF THE ACEROLA SEED (MALPIGHIA EMARGINATA) AS A NATURAL ADSORBENT FOR GROUNDWATER SOFTENING

2018 ◽  
Vol 15 (29) ◽  
pp. 49-55
Author(s):  
A. C. P. da SILVA ◽  
F. P. de ANDRADE JUNIOR ◽  
V. A. da COSTA ◽  
D. D. da SILVA
Keyword(s):  
Total Dissolved Solids ◽  
Total Hardness ◽  
Adsorption Potential ◽  
Inorganic Pollutants ◽  
Natural Adsorbent ◽  
Natural Adsorbents ◽  
Before And After ◽  
Malpighia Emarginata ◽  
New Treatment

With increasing contamination of water by various pollutants, which makes this resource increasingly scarce and unfit for use, there is a need to develop new treatment methods that are accessible, efficient, renewable and do not produce polluting waste that degrades the environment. Due to this the use of natural adsorbents has become one of the most investigated alternatives for the treatment of waters whether for the removal of organic or inorganic pollutants. This work aims to study the adsorption potential of a natural adsorbent from acerola seed by means of column chromatography to adjust the total hardness of groundwater after the characterization of physicochemical parameters such as pH, electrical conductivity, Turbidity, total dissolved solids, chlorides, alkalinity and total hardness. The adsorbent samples before and after being used for the treatment were characterized by infrared absorption spectroscopy (FTIR), scanning electron microscopy (SEM). The use of the natural adsorbent obtained from the acerola seed was very effective for the treatment of hardness of the analyzed.

Water Scarcity and Conflicts

2017 ◽  
pp. 245-268
Author(s):  
Nilanjan Ghosh ◽  
Anandajit Goswami
Keyword(s):  
Water Resources ◽  
Water Availability ◽  
Water Scarcity ◽  
Futures Market ◽  
Indian Agriculture ◽  
Value Of Water

This chapter presents the concept of the establishment of a futures market in water in the context of the risk of water availability that Indian agriculture has been facing in the recent years. In the process, the chapter argues how the development of such a market can actually reduce the scarcity value of water, and may help in reducing the intensity of conflicts over water resources.

Water scarcity and food security: alternative futures for the 21st century

2001 ◽  
Vol 43 (4) ◽  
pp. 61-70 ◽  
Author(s):  
M. W. Rosengrant ◽  
X. Cai
Keyword(s):  
Food Security ◽  
Water Availability ◽  
Water Scarcity ◽  
Food Production ◽  
Irrigated Agriculture ◽  
Modeling Framework ◽  
Alternative Futures ◽  
Water Demands ◽  
Agriculture And Food

Water availability for agriculture - the major water user worldwide - is one of the most critical factors for food security in many regions of the world. The role of water withdrawals in irrigated agriculture and food security has been receiving substantial attention in recent years. This paper addresses key questions regarding water availability and food security, including: How will water availability and water demand evolve over the next three decades, taking into account availability and variability in water resources, the water supply infrastructure, and irrigation and nonagricultural water demands? What are the relationships among water scarcity, food production, and food security? How much of future food production will come from rainfed and irrigated areas? A global modeling framework, IMPACT-Water, is applied to explore answers to these questions using analysis.

Individual-, household- and neighbourhood-level characteristics associated with life satisfaction: A multilevel analysis of a population-based sample from Hong Kong

Urban Studies ◽  
2016 ◽  
Vol 54 (16) ◽  
pp. 3700-3717 ◽  
Author(s):  
Chia-Yueh Hsu ◽  
Shu-Sen Chang ◽  
Paul Yip
Keyword(s):  
Life Satisfaction ◽  
Hong Kong ◽  
Social Dynamics ◽  
Multilevel Models ◽  
Panel Study ◽  
Population Based ◽  
Poverty Rate ◽  
Household Level ◽  
Neighbourhood Level ◽  
Individual Household

We examined the relationships between individuals’ life satisfaction and individual-, household- and neighbourhood-level characteristics and evidence for cross-level interactions. We used data on individuals’ life satisfaction and a range of individual- and household-level characteristics from the Hong Kong Panel Study of Social Dynamics (2011) with linkage to neighbourhood-level aggregated data extracted from the 2011 census. The neighbourhood-level variables included the poverty rate and four factors derived from factor analysis based on 21 variables. Multilevel models were used to allow for the hierarchical nature of the data. Most of the variance in life satisfaction could be explained by individual- and household-level characteristics. Neighbourhood-level characteristics accounted for a small proportion (around 5% or less) of the variance. Most of the individual- and household-level characteristics studied were associated with life satisfaction. Life satisfaction was negatively associated with local poverty rate and three neighbourhood factors (deprivation, social fragmentation and ageing). There was evidence of cross-level interactions. For example, the level of life satisfaction decreased with an increasing neighbourhood poverty rate among individuals who did not receive Comprehensive Social Security Assistance (CSSA), but CSSA recipients had a higher level of life satisfaction in areas with higher poverty rates. The negative effect of neighbourhood poverty on life satisfaction was more marked in individuals who rented or owned their homes than in those who lived in public housing. Our results have implications for urban policies that may improve life satisfaction such as financial and housing support for high risk individuals.

scholarly journals A global water scarcity assessment under Shared Socio-economic Pathways – Part 2: Water availability and scarcity

2013 ◽  
Vol 17 (7) ◽  
pp. 2393-2413 ◽  
Author(s):  
N. Hanasaki ◽  
S. Fujimori ◽  
T. Yamamoto ◽  
S. Yoshikawa ◽  
Y. Masaki ◽  
...  
Keyword(s):  
Water Use ◽  
Water Availability ◽  
Water Scarcity ◽  
Climate Models ◽  
Water Cycle ◽  
Electricity Production ◽  
Daily Consumption ◽  
Water Abstraction ◽  
Daily Water ◽  
Global Water

Abstract. A global water scarcity assessment for the 21st century was conducted under the latest socio-economic scenario for global change studies, namely Shared Socio-economic Pathways (SSPs). SSPs depict five global situations with substantially different socio-economic conditions. In the accompanying paper, a water use scenario compatible with the SSPs was developed. This scenario considers not only quantitative socio-economic factors such as population and electricity production but also qualitative ones such as the degree of technological change and overall environmental consciousness. In this paper, water availability and water scarcity were assessed using a global hydrological model called H08. H08 simulates both the natural water cycle and major human activities such as water abstraction and reservoir operation. It simulates water availability and use at daily time intervals at a spatial resolution of 0.5° × 0.5°. A series of global hydrological simulations were conducted under the SSPs, taking into account different climate policy options and the results of climate models. Water scarcity was assessed using an index termed the Cumulative Abstraction to Demand ratio, which is expressed as the accumulation of daily water abstraction from a river divided by the daily consumption-based potential water demand. This index can be used to express whether renewable water resources are available from rivers when required. The results suggested that by 2071–2100 the population living under severely water-stressed conditions for SSP1-5 will reach 2588–2793 × 106 (39–42% of total population), 3966–4298 × 106 (46–50%), 5334–5643 × 106 (52–55%), 3427–3786 × 106 (40–45%), 3164–3379 × 106 (46–49%) respectively, if climate policies are not adopted. Even in SSP1 (the scenario with least change in water use and climate) global water scarcity increases considerably, as compared to the present-day. This is mainly due to the growth in population and economic activity in developing countries, and partly due to hydrological changes induced by global warming.

scholarly journals Integrated assessment of global water scarcity over the 21st century – Part 1: Global water supply and demand under extreme radiative forcing

2013 ◽  
Vol 10 (3) ◽  
pp. 3327-3381 ◽  
Author(s):  
M. I. Hejazi ◽  
J. Edmonds ◽  
L. Clarke ◽  
P. Kyle ◽  
E. Davies ◽  
...  
Keyword(s):  
21St Century ◽  
Water Availability ◽  
Water Scarcity ◽  
Water Demand ◽  
Integrated Assessment ◽  
Radiative Forcing ◽  
Assessment Model ◽  
Water Demands ◽  
Global Population ◽  
Global Water

Abstract. Water scarcity conditions over the 21st century both globally and regionally are assessed in the context of climate change, by estimating both water availability and water demand within the Global Change Assessment Model (GCAM), a leading community integrated assessment model of energy, agriculture, climate, and water. To quantify changes in future water availability, a new gridded water-balance global hydrologic model – namely, the Global Water Availability Model (GWAM) – is developed and evaluated. Global water demands for six major demand sectors (irrigation, livestock, domestic, electricity generation, primary energy production, and manufacturing) are modeled in GCAM at the regional scale (14 geopolitical regions, 151 sub-regions) and then spatially downscaled to 0.5° × 0.5° resolution to match the scale of GWAM. Using a baseline scenario (i.e., no climate change mitigation policy) with radiative forcing reaching 8.8 W m−2 (equivalent to the SRES A1Fi emission scenario) and a global population of 14 billion by 2095, global annual water demand grows from about 9–10% of total annual renewable freshwater in 2005 to about 32–37% by 2095. This results in more than half of the world population living under extreme water scarcity by the end of the 21st century. Regionally, the demand for water exceeds the amount of water availability in two GCAM regions, the Middle East and India. Additionally, in years 2050 and 2095 36% (28%) and 44% (39%) of the global population, respectively is projected to live in grid cells (in basins) that will experience greater water demands than the amount of available water in a year (i.e., the water scarcity index (WSI) > 1.0). This study implies an increasingly prominent role for water in future human decisions, and highlights the importance of including water in integrated assessment of global change.

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