Anusha Thapa, Ghanashyam Khanal, S. Mahapatra, Niranjan Devkota, Surendra Mahato, U. R. Paudel
The urban water supply systems around the world are highly stressed at present due to growing water demand caused by rapid population growth and unplanned urbanization. The growing environmental awareness and water supply restrictions have made, rainwater harvesting systems (RWHS) a priority as well as a necessity in many countries. To improve urban water security, the practice of an RWHS is increasingly being adopted in the cities and towns of developing countries. This study aims at identifying the factors affecting the adoption of rainwater harvesting for household uses in the Kathmandu valley (KV) of Nepal. The results were drawn from a survey of 405 respondents who reside in the KV. To explain the determinants of adaptation, structural equation modeling (SEM) was used. Results show that independence for water access and system sophistication are significant for the adaptation of RWHS and relative advantage plays a moderating role that has partial mediation among dependent and independent variables with a significant relationship. Thus, variables like independence for water access, system sophistication, relative advantage and sustainable use should be highlighted for a sustainable supply of water. For this, we recommend effective policy interventions at the local and national level for the adoption of RWHS and its advantages in terms of safeguarding water in the long run at the present changing climate scenario.
{"title":"Identifying determinants of sustainable water management at the household level through rainwater harvesting systems in Nepal","authors":"Anusha Thapa, Ghanashyam Khanal, S. Mahapatra, Niranjan Devkota, Surendra Mahato, U. R. Paudel","doi":"10.2166/wp.2022.113","DOIUrl":"https://doi.org/10.2166/wp.2022.113","url":null,"abstract":"\u0000 The urban water supply systems around the world are highly stressed at present due to growing water demand caused by rapid population growth and unplanned urbanization. The growing environmental awareness and water supply restrictions have made, rainwater harvesting systems (RWHS) a priority as well as a necessity in many countries. To improve urban water security, the practice of an RWHS is increasingly being adopted in the cities and towns of developing countries. This study aims at identifying the factors affecting the adoption of rainwater harvesting for household uses in the Kathmandu valley (KV) of Nepal. The results were drawn from a survey of 405 respondents who reside in the KV. To explain the determinants of adaptation, structural equation modeling (SEM) was used. Results show that independence for water access and system sophistication are significant for the adaptation of RWHS and relative advantage plays a moderating role that has partial mediation among dependent and independent variables with a significant relationship. Thus, variables like independence for water access, system sophistication, relative advantage and sustainable use should be highlighted for a sustainable supply of water. For this, we recommend effective policy interventions at the local and national level for the adoption of RWHS and its advantages in terms of safeguarding water in the long run at the present changing climate scenario.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41778191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Subjective well-being is a metric for assessing the effectiveness of the public policy. However, the relationship between depression, an important indicator of subjective well-being, and access to clean water (ACW) has received scant attention. This study investigates the effect of ACW on depression using the 2014–2018 waves of the China Family Panel Studies (CFPS). Using ordinary least squares (OLS) two-way fixed effects (FE) estimation, the results indicate that ACW leads to lower levels of depression. The ACW–depression relationship is mediated by individual self-reported health and household food expenditure, but the mechanism varies across subsamples, as determined by structural equation modelling of the underlying mechanisms. The results of the heterogeneity analysis demonstrated that the total effect of the absence of ACW on depression is mitigated when rural migrants reside in cities, and that the effect disappears entirely when the migrant has an urban hukou. These findings demonstrate the negative impact of urban–rural disparities and hukou issues on mental health.
{"title":"Depression: Does water matters?","authors":"Hongxu Shi","doi":"10.2166/wp.2022.263","DOIUrl":"https://doi.org/10.2166/wp.2022.263","url":null,"abstract":"\u0000 Subjective well-being is a metric for assessing the effectiveness of the public policy. However, the relationship between depression, an important indicator of subjective well-being, and access to clean water (ACW) has received scant attention. This study investigates the effect of ACW on depression using the 2014–2018 waves of the China Family Panel Studies (CFPS). Using ordinary least squares (OLS) two-way fixed effects (FE) estimation, the results indicate that ACW leads to lower levels of depression. The ACW–depression relationship is mediated by individual self-reported health and household food expenditure, but the mechanism varies across subsamples, as determined by structural equation modelling of the underlying mechanisms. The results of the heterogeneity analysis demonstrated that the total effect of the absence of ACW on depression is mitigated when rural migrants reside in cities, and that the effect disappears entirely when the migrant has an urban hukou. These findings demonstrate the negative impact of urban–rural disparities and hukou issues on mental health.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44619498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elizabeth A. Koebele, L. Singletary, Shelby E. Hockaday, K. J. Ormerod
In many semi-arid, snow-fed river systems, climate change is shifting the timing and quantity of streamflow, while changing water use priorities introduce additional demands on water supplies. These dynamics challenge water security across the globe. Water markets – economic instruments used to reallocate water via voluntary trade – may be used to adapt to these changes, though their implementation remains limited. To understand how water markets may enhance water security in the western United States, we assess diverse actors’ perceptions of water allocation institutions broadly, as well as their preferences for different water market designs, in the empirical context of the Walker River Basin. This 4,200-square mile watershed, located on the California-Nevada border, exemplifies many key regional water management challenges. Through an analysis of 30 in-depth interviews, we find that actors across sectors desire changes to traditional water allocation institutions, preferably at the local level, and view markets as an acceptable tool for reallocation. Despite identified legal and social challenges, markets that facilitate temporary water trading are generally preferred. While limited to the context of a single basin, these findings provide lessons for designing water markets to enhance water security in basins regionally and beyond.
{"title":"A role for water markets in enhancing water security in the western United States?: Lessons from the Walker River Basin","authors":"Elizabeth A. Koebele, L. Singletary, Shelby E. Hockaday, K. J. Ormerod","doi":"10.2166/wp.2022.071","DOIUrl":"https://doi.org/10.2166/wp.2022.071","url":null,"abstract":"\u0000 In many semi-arid, snow-fed river systems, climate change is shifting the timing and quantity of streamflow, while changing water use priorities introduce additional demands on water supplies. These dynamics challenge water security across the globe. Water markets – economic instruments used to reallocate water via voluntary trade – may be used to adapt to these changes, though their implementation remains limited. To understand how water markets may enhance water security in the western United States, we assess diverse actors’ perceptions of water allocation institutions broadly, as well as their preferences for different water market designs, in the empirical context of the Walker River Basin. This 4,200-square mile watershed, located on the California-Nevada border, exemplifies many key regional water management challenges. Through an analysis of 30 in-depth interviews, we find that actors across sectors desire changes to traditional water allocation institutions, preferably at the local level, and view markets as an acceptable tool for reallocation. Despite identified legal and social challenges, markets that facilitate temporary water trading are generally preferred. While limited to the context of a single basin, these findings provide lessons for designing water markets to enhance water security in basins regionally and beyond.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47934531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guangli Yang, Z. Fan, Dongzhou Li, Shengnan Feng, Guoqing Liu, Qiyun Li, Z. Dong
Recently, the Chinese government has issued various policies to regulate water resource management. The ‘three red lines’ policy is one of the most important. To quantify the influence of the ‘three red lines’ policy on water resource carrying status (WRCS), analyze the shortcomings of the current water resource management and provide support for adjusting the direction of water resource management, we constructed a system dynamics model that considered ‘red line’ constraint feedback and simulated changes in WRCS characterization indicators from the period 2019 to 2040 in coastal cities of Jiangsu Province. The WRCS in Nantong city from 2019 to 2035 was medium and that from 2035 to 2040 was poor; that in Yancheng city from 2019 to 2037 was medium and that from 2038 to 2040 was poor; that in Lianyungang city from 2019 to 2036 was medium and that from 2037 to 2040 was poor. We then constructed three schemes with strategies to improve the WRCS. Compared with the initial scheme, Scheme I, involving further enhanced water resource utilization efficiency and reduced discharge of pollutants, improved the WRCS. Based on Scheme III, the economic scale can be expanded by increasing economic development at an appropriate speed, while the WRCS remains almost consistent with the initial scheme.
{"title":"Prediction of water resource carrying status based on the ‘three red lines’ water resource management policy in the coastal area of Jiangsu Province, China","authors":"Guangli Yang, Z. Fan, Dongzhou Li, Shengnan Feng, Guoqing Liu, Qiyun Li, Z. Dong","doi":"10.2166/wp.2022.059","DOIUrl":"https://doi.org/10.2166/wp.2022.059","url":null,"abstract":"\u0000 Recently, the Chinese government has issued various policies to regulate water resource management. The ‘three red lines’ policy is one of the most important. To quantify the influence of the ‘three red lines’ policy on water resource carrying status (WRCS), analyze the shortcomings of the current water resource management and provide support for adjusting the direction of water resource management, we constructed a system dynamics model that considered ‘red line’ constraint feedback and simulated changes in WRCS characterization indicators from the period 2019 to 2040 in coastal cities of Jiangsu Province. The WRCS in Nantong city from 2019 to 2035 was medium and that from 2035 to 2040 was poor; that in Yancheng city from 2019 to 2037 was medium and that from 2038 to 2040 was poor; that in Lianyungang city from 2019 to 2036 was medium and that from 2037 to 2040 was poor. We then constructed three schemes with strategies to improve the WRCS. Compared with the initial scheme, Scheme I, involving further enhanced water resource utilization efficiency and reduced discharge of pollutants, improved the WRCS. Based on Scheme III, the economic scale can be expanded by increasing economic development at an appropriate speed, while the WRCS remains almost consistent with the initial scheme.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47901874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Voth-Gaeddert, D. Momberg, Kela Brathwaite, Andrew Schranck, Stephen Libbey, Mandy Lemley
Among island communities, water security and access continue to be a critical issue. In the US Virgin Islands (USVI), 90% of households are capable of collecting roof-harvested rainwater, whereas less than 25% of households are connected to a municipal water system serviced by desalination plants. Rainwater collection leaves the household in charge of managing and treating their own water. Therefore, understanding current barriers to accessing water treatment technologies and the costs of a water storage and treatment program at scale are critical in developing a territory-wide program. In this study, we evaluate (1) household-level barriers to accessing water treatment technologies, (2) a cost breakdown of a UV water treatment pilot program, and (3) potential estimates of program costs at a territory-wide scale. The results suggest that for households, key barriers include knowledge of the problem or solution and capital and installation costs. From the programmatic cost evaluation, the water treatment technology and water testing services were the most expensive. However, given key adjustments, a territory-wide program is estimated to cost $30.4 M covering 50% of households. These data can be used by a coalition of stakeholders in allocating financial and managerial responsibility for a territory-wide water storage and treatment program in the USVI.
{"title":"Evaluating the costs and components of a territory-wide household water storage and treatment program in the US Virgin Islands","authors":"L. Voth-Gaeddert, D. Momberg, Kela Brathwaite, Andrew Schranck, Stephen Libbey, Mandy Lemley","doi":"10.2166/wp.2022.127","DOIUrl":"https://doi.org/10.2166/wp.2022.127","url":null,"abstract":"\u0000 Among island communities, water security and access continue to be a critical issue. In the US Virgin Islands (USVI), 90% of households are capable of collecting roof-harvested rainwater, whereas less than 25% of households are connected to a municipal water system serviced by desalination plants. Rainwater collection leaves the household in charge of managing and treating their own water. Therefore, understanding current barriers to accessing water treatment technologies and the costs of a water storage and treatment program at scale are critical in developing a territory-wide program. In this study, we evaluate (1) household-level barriers to accessing water treatment technologies, (2) a cost breakdown of a UV water treatment pilot program, and (3) potential estimates of program costs at a territory-wide scale. The results suggest that for households, key barriers include knowledge of the problem or solution and capital and installation costs. From the programmatic cost evaluation, the water treatment technology and water testing services were the most expensive. However, given key adjustments, a territory-wide program is estimated to cost $30.4 M covering 50% of households. These data can be used by a coalition of stakeholders in allocating financial and managerial responsibility for a territory-wide water storage and treatment program in the USVI.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46223483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solving the problem of agricultural water use efficiency is an effective means to understand the agricultural ecological civilization and food security. In order to balance the relationship between agriculture water efficiency and regional economic size, this study examines the agricultural water use efficiency in China based on the Super-SBM model of unexpected output. At the same time, the Spatial Durbin Model (SDM) was introduced to analyze the spatial spillover effect and try to find ways to improve agricultural water use efficiency from the perspective of influencing factors. The present study used the panel data of 30 provinces in China from 1998 to 2018 for obtaining empirical results. The results show that (1) China's agricultural water resources’ utilization efficiency in 21 years has not remained high, the results showed that it was 0.496 in 1998, 0.572 in 2008, and 0.657 in 2018, but it is slowly rising which explains that the low efficiency is mainly caused by the low pure technical efficiency; (2) the overall agricultural water use efficiency in China is in a situation of spatial agglomeration but there has been a trend of shifting positive correlations to negative correlations among neighboring provinces, The study found that compared with 1998 in 2018, high–high agglomeration type and low–low agglomeration type down from 20 provinces 12 provinces, And low – high agglomeration type and high–low agglomeration type’ is increased from 10 provinces to 2018, which specifically manifested as a negative spillover effect; (3) during the research period, the province's agricultural fixed asset investment, fiscal expenditure on agriculture, forestry, and water affairs, the number of years of education of rural residents and the increase in crop sown area have positive impacts on the efficiency of agricultural water use in the province. While the transfer of labor and increase in the disposable income of rural residents reduced the efficiency of agricultural water use in the province. Fixed agricultural investment, labor transfers, and financial expenditures for agriculture, forestry, and water affairs in neighboring provinces have negative impacts on the province's agricultural water use efficiency. The impact is specifically manifested as a negative spatial spillover effect. As a result, China's agriculture will move towards healthy and green development. Therefore, the efficiency of agricultural water use needs to be comprehensively improved.
{"title":"Agricultural water use efficiency and spatial spillover effect considering undesired output in China","authors":"Dong Rui, N. Riaz, Wu Guoyong, G. Qiang","doi":"10.2166/wp.2022.111","DOIUrl":"https://doi.org/10.2166/wp.2022.111","url":null,"abstract":"\u0000 Solving the problem of agricultural water use efficiency is an effective means to understand the agricultural ecological civilization and food security. In order to balance the relationship between agriculture water efficiency and regional economic size, this study examines the agricultural water use efficiency in China based on the Super-SBM model of unexpected output. At the same time, the Spatial Durbin Model (SDM) was introduced to analyze the spatial spillover effect and try to find ways to improve agricultural water use efficiency from the perspective of influencing factors. The present study used the panel data of 30 provinces in China from 1998 to 2018 for obtaining empirical results. The results show that (1) China's agricultural water resources’ utilization efficiency in 21 years has not remained high, the results showed that it was 0.496 in 1998, 0.572 in 2008, and 0.657 in 2018, but it is slowly rising which explains that the low efficiency is mainly caused by the low pure technical efficiency; (2) the overall agricultural water use efficiency in China is in a situation of spatial agglomeration but there has been a trend of shifting positive correlations to negative correlations among neighboring provinces, The study found that compared with 1998 in 2018, high–high agglomeration type and low–low agglomeration type down from 20 provinces 12 provinces, And low – high agglomeration type and high–low agglomeration type’ is increased from 10 provinces to 2018, which specifically manifested as a negative spillover effect; (3) during the research period, the province's agricultural fixed asset investment, fiscal expenditure on agriculture, forestry, and water affairs, the number of years of education of rural residents and the increase in crop sown area have positive impacts on the efficiency of agricultural water use in the province. While the transfer of labor and increase in the disposable income of rural residents reduced the efficiency of agricultural water use in the province. Fixed agricultural investment, labor transfers, and financial expenditures for agriculture, forestry, and water affairs in neighboring provinces have negative impacts on the province's agricultural water use efficiency. The impact is specifically manifested as a negative spatial spillover effect. As a result, China's agriculture will move towards healthy and green development. Therefore, the efficiency of agricultural water use needs to be comprehensively improved.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48565875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Industrial wastewater recycling projects are mainly used for alleviation of both water scarcity and contamination of freshwater bodies. These projects mainly address major challenges related to technological and economic aspects rather than stakeholders’ responsibility. Hence, little is known for the role of responsible stakeholders as a major part of planning policy, which requires recognition of their crucial role and integration into associated procedures. This paper presents a new decision support framework to identify responsible stakeholders and reveal the role of their motivations. The approach integrates qualitative and frequency analysis methods into a comprehensive framework to identify the problems over the project lifetime from visible to their roots and link them together with stakeholders through deep mapping. The planning policy framework is applied to a real-world case study of industrial parks in Iran. The results of the case study show that visible economic, social, and technological problems are caused by responsible stakeholders with no direct role in those projects. Additionally, deep mapping analysis shows various deep roots caused by the government and industry are linked to visible problems across all project phases that are related to the role of stakeholders, their behaviour, and deep beliefs.
{"title":"A novel framework for planning policy and responsible stakeholders in industrial wastewater reuse projects: a case study in Iran","authors":"F. Piadeh, M. Ahmadi, K. Behzadian","doi":"10.2166/wp.2022.078","DOIUrl":"https://doi.org/10.2166/wp.2022.078","url":null,"abstract":"\u0000 Industrial wastewater recycling projects are mainly used for alleviation of both water scarcity and contamination of freshwater bodies. These projects mainly address major challenges related to technological and economic aspects rather than stakeholders’ responsibility. Hence, little is known for the role of responsible stakeholders as a major part of planning policy, which requires recognition of their crucial role and integration into associated procedures. This paper presents a new decision support framework to identify responsible stakeholders and reveal the role of their motivations. The approach integrates qualitative and frequency analysis methods into a comprehensive framework to identify the problems over the project lifetime from visible to their roots and link them together with stakeholders through deep mapping. The planning policy framework is applied to a real-world case study of industrial parks in Iran. The results of the case study show that visible economic, social, and technological problems are caused by responsible stakeholders with no direct role in those projects. Additionally, deep mapping analysis shows various deep roots caused by the government and industry are linked to visible problems across all project phases that are related to the role of stakeholders, their behaviour, and deep beliefs.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42835232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rivers and their surrounding land provide resources and services that result in trade-offs requiring legislative and institutional interventions, for which the perspectives of law-policymakers and their societal values and political expediencies play a major role in decision-making. This study critically evaluates the evolving land–river governance in large democratically elected governments with complex developmental priorities and how law-policymakers’ recognition of emerging issues of river management influences common pool environmental resources governance. We selected an emerging economy – India – and analysed Parliamentary Questions (PQs) between 1999 and 2020 using a mixed method approach. Conflicting priorities over economic development, pollution management, socio-cultural values and inter-state–centre issues shape the evolving priorities of land–river governance. A declining focus on large-scale dams coupled with increasing attention on inter-basin water transfers, river conservation and pollution abatement, demonstrates an evolution away from the earlier narrow view of rivers for irrigation and hydropower. Our analysis demonstrates how the priorities of law-policymakers and political expedience play a critical role in river governance and thereby provide important insights into common pool environmental resources governance for sustainable development while also identifying important knowledge gaps and suggesting scopes for interdisciplinary studies.
{"title":"Identifying evolving priorities in national river governance from Parliamentary Questions","authors":"A. Azhoni, I. Holman, R. Grabowski","doi":"10.2166/wp.2022.125","DOIUrl":"https://doi.org/10.2166/wp.2022.125","url":null,"abstract":"\u0000 Rivers and their surrounding land provide resources and services that result in trade-offs requiring legislative and institutional interventions, for which the perspectives of law-policymakers and their societal values and political expediencies play a major role in decision-making. This study critically evaluates the evolving land–river governance in large democratically elected governments with complex developmental priorities and how law-policymakers’ recognition of emerging issues of river management influences common pool environmental resources governance. We selected an emerging economy – India – and analysed Parliamentary Questions (PQs) between 1999 and 2020 using a mixed method approach. Conflicting priorities over economic development, pollution management, socio-cultural values and inter-state–centre issues shape the evolving priorities of land–river governance. A declining focus on large-scale dams coupled with increasing attention on inter-basin water transfers, river conservation and pollution abatement, demonstrates an evolution away from the earlier narrow view of rivers for irrigation and hydropower. Our analysis demonstrates how the priorities of law-policymakers and political expedience play a critical role in river governance and thereby provide important insights into common pool environmental resources governance for sustainable development while also identifying important knowledge gaps and suggesting scopes for interdisciplinary studies.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41913565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heavy metal pollution in water environment has always been a hot issue in environmental pollution research. Among various removal methods of heavy metal pollution, adsorption has attracted attention because of its low cost and low secondary pollution. Montmorillonite is one of an ideal adsorption materials because of its natural pore structure and a high specific surface area. In this review, the modification methods of montmorillonite are introduced. The adsorption effect of different heavy metal ions and the main factors affecting the adsorption are discussed in detail. Meanwhile, the adsorption mechanism is intensively reviewed. The removal of Cr(VI), Cd(II), Pb(II), Cu(II), Cs(I), Co(II), Hg(II), Zn(II), Ni(II), and other nine heavy metal ions by modified montmorillonite was summarized and discussed, and the optimal pH values for different adsorbents were also different, but they were all less than 7, and the removal rates of heavy metal ions by modified montmorillonite under optimal conditions were all greater than 90%. It is concluded that the composite montmorillonite material has a great adsorption potential. Finally, it is proposed that the combination of advanced oxidation and composite montmorillonite material adsorption to remove heavy metal ions is an important direction of adsorption and removal of heavy metal ions in the water environment in the future.
{"title":"A review of the removal of heavy metal ions in wastewater by modified montmorillonite","authors":"Yan Shi, Songtao Zhong, Xin Wang, C. Feng","doi":"10.2166/wp.2022.033","DOIUrl":"https://doi.org/10.2166/wp.2022.033","url":null,"abstract":"\u0000 Heavy metal pollution in water environment has always been a hot issue in environmental pollution research. Among various removal methods of heavy metal pollution, adsorption has attracted attention because of its low cost and low secondary pollution. Montmorillonite is one of an ideal adsorption materials because of its natural pore structure and a high specific surface area. In this review, the modification methods of montmorillonite are introduced. The adsorption effect of different heavy metal ions and the main factors affecting the adsorption are discussed in detail. Meanwhile, the adsorption mechanism is intensively reviewed. The removal of Cr(VI), Cd(II), Pb(II), Cu(II), Cs(I), Co(II), Hg(II), Zn(II), Ni(II), and other nine heavy metal ions by modified montmorillonite was summarized and discussed, and the optimal pH values for different adsorbents were also different, but they were all less than 7, and the removal rates of heavy metal ions by modified montmorillonite under optimal conditions were all greater than 90%. It is concluded that the composite montmorillonite material has a great adsorption potential. Finally, it is proposed that the combination of advanced oxidation and composite montmorillonite material adsorption to remove heavy metal ions is an important direction of adsorption and removal of heavy metal ions in the water environment in the future.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43383866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Northwest China frequently experiences significant droughts and water shortages. To better balance the supply and demand, and provide sufficient funds for water resource projects, this study applied a computable general equilibrium model to construct an agricultural water pricing policy model that depends on the crops' economic value and regional water use characteristics. Wuwei City in Gansu Province was used as a case study to test the model. Three agricultural water price increase policies and three supporting subsidy policies were developed. The study quantitatively investigated the impact of these policies on the agricultural economy, water use, and efficiency of water use from different water sources. The results indicated that water pricing reform promotes water conservation and improves water use efficiency. Subsidies can reduce the negative impact of water pricing policies on the agricultural economy. Economic crops (e.g. vegetables) are more sensitive to water prices compared to food crops (e.g. wheat). Finally, to best our knowledge, this study provided the best water pricing reform scenario expected to be the most effective for local development.
{"title":"Analysis of agriculture water pricing reform in a water-deficit area of Northwest China","authors":"Yongyu Qu, Jian Kang, Xichen Lin, H. Ni, Yunzhong Jiang, Genfa Chen","doi":"10.2166/wp.2022.288","DOIUrl":"https://doi.org/10.2166/wp.2022.288","url":null,"abstract":"\u0000 Northwest China frequently experiences significant droughts and water shortages. To better balance the supply and demand, and provide sufficient funds for water resource projects, this study applied a computable general equilibrium model to construct an agricultural water pricing policy model that depends on the crops' economic value and regional water use characteristics. Wuwei City in Gansu Province was used as a case study to test the model. Three agricultural water price increase policies and three supporting subsidy policies were developed. The study quantitatively investigated the impact of these policies on the agricultural economy, water use, and efficiency of water use from different water sources. The results indicated that water pricing reform promotes water conservation and improves water use efficiency. Subsidies can reduce the negative impact of water pricing policies on the agricultural economy. Economic crops (e.g. vegetables) are more sensitive to water prices compared to food crops (e.g. wheat). Finally, to best our knowledge, this study provided the best water pricing reform scenario expected to be the most effective for local development.","PeriodicalId":49370,"journal":{"name":"Water Policy","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42181455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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