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Understanding groundwater geochemistry is crucial for water supply in arid regions. The present research was conducted in the arid Mo river watershed on the Tibetan plateau to gain insights into the geochemical characteristics, governing processes and quality of groundwater in arid endorheic watersheds. A total of 28 groundwater samples were collected from the phreatic and confined aquifers for hydrochemical analysis. The results showed that the groundwater was slightly alkaline in all aquifers of the watershed. The phreatic groundwater samples (PGs) and confined groundwater samples (CGs) had the TDS value in the ranges of 609.19–56,715.34 mg/L and 811.86–2509.51 mg/L, respectively. PGs were salter than CGs, especially in the lower reaches. Both the PGs and CGs were dominated by the Cl-Na type, followed by the mixed Cl-Mg·Ca type. The toxic elements of NO2− (0.00–0.20 mg/L for PGs and 0.00–0.60 mg/L for CGs), NH4+ (0.00–0.02 mg/L for PGs and 0.00–0.02 mg/L for CGs) and F− (0.00–4.00 mg/L for PGs and 1.00–1.60 mg/L for CGs) exceeded the permissible limits of the Chinese guidelines at some sporadic sites. Water–rock interactions, including silicates weathering, mineral dissolution (halite and sulfates) and ion exchange, were the main contributions to the groundwater chemistry of all aquifers. The geochemistry of PGs in the lower reach was also greatly influenced by evaporation. Agricultural sulfate fertilizer input was responsible for the nitrogen pollutants and salinity of PGs. All CGs and 73.91% of PGs were within the Entropy-weighted water quality index (EWQI) of below 100 and were suitable for direct drinking purposes. Precisely 8.70 and 17.39% of PGs were within the EWQI value in the range of 100–150 (medium quality and suitable for domestic usage) and beyond 200 (extremely poor quality and not suitable for domestic usage), respectively. The electrical conductivity, sodium adsorption ratio, sodium percentage and permeability index indicated that groundwater in most parts of the watershed was suitable for irrigation, and only a small portion might cause salinity, sodium or permeability hazards. Groundwater with poor quality was mainly distributed in the lower reaches. CGs and PGs in the middle-upper reaches could be considered as the primary water resources for water supply. Agricultural pollution should be paid more attention to safeguard the quality of groundwater.

Disposal facilities are essential components of waste management. Even with the increased emphasis on waste minimisation, reuse and recycling, the amounts of waste residues requiring disposal are continuously increasing. Urban centres are faced with a multitude of problems owing to increasing quantities of waste residues coupled with decreasing availability of land in urban areas. Optimal use of land for the disposal facilities is a necessity for the civic authorities. Landfills are still the most used method of disposal, especially in developing countries. Costs and environmental risks associated with disposal facilities vary with respect to time in a complex manner. The success of a long-term plan for solid waste disposal critically depends on the best use of landfills with respect to time. In this paper, an integer linear programming based optimisation model is presented. This model addresses multiple objectives including costs and environmental risk for multi-period planning. A case study of solid waste disposal in the capital city Delhi, India, is presented, demonstrating the utility of the proposed model.

In view of the climate change threat, India has recently committed to reduce greenhouse gas emissions to 35% by 2030 relative to 2005 levels. Energy efficiency in buildings offers the greatest potential for saving energy at the lowest cost. This paper reviews current energy consumption trends in the residential building sector of India and traces various initiatives by the government to reduce dependence on fossil fuels in terms of regulatory framework, green building rating systems, fiscal incentives and institutional mechanisms affecting energy demand management. Further, the paper provides an overview of various barriers and challenges in implementing energy efficiency programmes in housing along with suggestions to strengthen the institutional framework and create awareness to accelerate energy efficiency programmes for reducing CO2 emissions.

Contexte et objectif : Les partenariats sont un mécanisme clé dans la planification, la prestation et la gestion de la foresterie urbaine (FU) et des infrastructures vertes (IG). Ils peuvent faciliter la cogestion ancrée localement et la gouvernance polycentrique. Ils peuvent également réaliser des synergies en combinant les ressources, l'engagement et l'expertise de divers groupes de parties prenantes afin de générer des résultats précieux et de construire un capital social. Néanmoins, le terme « partenariats » n'est pas utilisé de manière cohérente dans la littérature et nécessite une clarification. Les caractéristiques qui distinguent une approche de partenariat des autres modes de coopération sont identifiées et décrites. La diversité des partenariats existants axés sur la FU et les IG est décrite, en référence à leurs parties prenantes, moteurs, activités et objectifs, ainsi que les avantages potentiels de l'approche de partenariat. Les considérations à faire dans leur évaluation sont dérivées de cette analyse de fond et les facteurs de réussite possibles sont discutés. Matériels et méthodes :La diversité, les objectifs et les caractéristiques d'une approche de partenariat sont basés sur une analyse documentaire approfondie.Résultats : Les partenariats se concentrent sur divers aspects et phases de prestation de l'UF, allant de la planification, de la conception et de la création de forêts urbaines et d'IG à leur gestion et utilisation.Les avantages fournis par de tels partenariats comprennent les services environnementaux et économiques ainsi que les services sociaux et culturels tels que l'éducation environnementale, la santé, les loisirs et le tourisme.Générer des services précieux tout en entretenant des relations entre les parties prenantes contribue à développer le capital social et à renforcer les capacités.En plus des avantages environnementaux, économiques et sociaux, l'évaluation des partenariats peut également aborder des variables de processus internes telles que l'apprentissage social, la relation entre les partenaires et les résultats de motivation qui peuvent influencer la coopération future.conclusions : Les partenariats coopératifs offrent une approche prometteuse pour la prestation de l'UF.Le développement des relations entre les partenaires maximise le potentiel de développement d'une coopération efficace à long terme et de renforcement du capital social en tant qu'aide à la promotion du développement durable. Antecedentes y propósito: Las asociaciones son un mecanismo clave en la planificación, entrega y gestión de la silvicultura urbana (UF) y la infraestructura verde (GI). Pueden facilitar la cogestión arraigada localmente y la gobernanza policéntrica. También pueden lograr sinergias combinando los recursos, el compromiso y la experiencia de diversos grupos de partes interesadas para generar resultados valiosos y construir capital social. Desafortunadamente, el término "asociaciones" no se usa de manera consistente en la literatura y requiere aclaración. Se identifican y describen las características que distinguen un enfoque de asociación de otros modos de cooperación. Se describe la diversidad de las asociaciones orientadas a UF y GI existentes, con referencia a sus partes interesadas, impulsores, actividades y objetivos, junto con las posibles ventajas del enfoque de asociación. Las consideraciones que se deben hacer en su evaluación se derivan de este análisis de antecedentes y se discuten los posibles factores de éxito. Materiales y métodos:La diversidad, los objetivos y las características definitorias de un enfoque de asociación se basan en una extensa revisión de la literatura. Resultados: Las asociaciones se centran en diversos aspectos y fases de entrega de UF, que van desde la planificación, el diseño y la creación de bosques urbanos e IG hasta su gestión y uso. Los beneficios obtenidos por dichas asociaciones incluyen servicios ambientales y económicos, así como servicios sociales y culturales como la educación ambiental, la salud, el ocio y el turismo. La generación de servicios valiosos y, al mismo tiempo, el fomento de las relaciones entre las partes interesadas ayuda a desarrollar el capital social y a desarrollar la capacidad. Además de los beneficios ambientales, económicos y sociales, la evaluación de las asociaciones también puede abordar variables de procesos internos como el aprendizaje social, la relación entre los socios y los resultados motivacionales que pueden influir en la cooperación futura. Conclusiones: Las asociaciones cooperativas ofrecen un enfoque prometedor para la entrega en UF. El desarrollo de las relaciones entre los socios maximiza el potencial para desarrollar una cooperación efectiva a largo plazo y para construir capital social como una ayuda para la promoción del desarrollo sostenible. Background and Purpose: Partnerships are a key mechanism in the planning, delivery and management of urban forestry (UF) and green infrastructure (GI).They can facilitate locally rooted co-management and polycentric governance.They can also achieve synergies by combining the resources, commitment and expertise of diverse stakeholder groups in order to generate valuable outcomes and build social capital.Unfortunately, the term "partnerships" is not used consistently in literature and requires clarification.The characteristics which distinguish a partnership approach from other modes of cooperation are identified and described.The diversity of existing UF and GI oriented partnerships is outlined, with reference to their stakeholders, drivers, activities and goals, together with potential advantages of the partnership approach.Considerations to be made in their evaluation are derived from this background analysis and possible success factors are discussed. Materials and Methods:The diversity, aims and defining characteristics of a partnership approach are based on an extensive literature review.Results: Partnerships focus on diverse aspects and delivery phases of UF, ranging from the planning, design and creation of urban forests and GI to their management and use.Benefits delivered by such partnerships include environmental and economic services as well as social and cultural services such as environmental education, health, leisure and tourism.Generating valuable services whilst at the same time nurturing relationships between stakeholders helps to develop social capital and build capacity.In addition to environmental, economic and social benefits, the evaluation of partnerships may also address internal process variables such as social learning, the relationship between partners, and motivational outcomes that can influence future co-operation.conclusions: Co-operative partnerships offer a promising approach for delivery in UF.The development of relationships between partners maximises the potential for developing effective long term co-operation and for building social capital as an aid to the promotion of sustainable development. الخلفية والغرض: الشراكات هي آلية رئيسية في تخطيط وتسليم وإدارة الحراجة الحضرية (UF) والبنية التحتية الخضراء (GI). يمكن أن تسهل الإدارة المشتركة ذات الجذور المحلية والحوكمة متعددة المراكز. كما يمكنها تحقيق التآزر من خلال الجمع بين الموارد والالتزام والخبرة لمجموعات أصحاب المصلحة المتنوعة من أجل توليد نتائج قيمة وبناء رأس المال الاجتماعي. لسوء الحظ، لا يتم استخدام مصطلح "الشراكات" باستمرار في الأدبيات ويتطلب توضيحًا. يتم تحديد ووصف الخصائص التي تميز نهج الشراكة عن أساليب التعاون الأخرى. يتم تحديد تنوع الشراكات الحالية الموجهة نحو UF و GI، مع الإشارة إلى أصحاب المصلحة والدوافع والأنشطة والأهداف، جنبًا إلى جنب مع المزايا المحتملة لنهج الشراكة. يتم استخلاص الاعتبارات التي يجب مراعاتها في تقييمها من هذا التحليل الأساسي وتتم مناقشة عوامل النجاح المحتملة. المواد والأساليب:يعتمد التنوع والأهداف والخصائص المميزة لنهج الشراكة على مراجعة شاملة للأدبيات .النتائج: تركز الشراكات على جوانب متنوعة ومراحل تسليم UF، بدءًا من تخطيط وتصميم وإنشاء الغابات الحضرية و GI إلى إدارتها واستخدامها. وتشمل الفوائد التي تقدمها هذه الشراكات الخدمات البيئية والاقتصادية بالإضافة إلى الخدمات الاجتماعية والثقافية مثل التعليم البيئي والصحة والترفيه والسياحة .توليد خدمات قيمة وفي الوقت نفسه رعاية العلاقات بين أصحاب المصلحة يساعد على تطوير رأس المال الاجتماعي وبناء القدرات .بالإضافة إلى الفوائد البيئية والاقتصادية والاجتماعية، قد يعالج تقييم الشراكات أيضًا متغيرات العملية الداخلية مثل التعلم الاجتماعي، والعلاقة بين الشركاء، والنتائج التحفيزية التي يمكن أن تؤثر على التعاون في المستقبل .الاستنتاجات: تقدم الشراكات التعاونية نهجًا واعدًا للتسليم في UF .إن تطوير العلاقات بين الشركاء يزيد من إمكانات تطوير التعاون الفعال طويل الأجل وبناء رأس المال الاجتماعي كمساعدة لتعزيز التنمية المستدامة.

The treatment and disposal of tyres from vehicles has long been of considerable environmental importance. Studies have been undertaken to reduce their environmental impact. In this study, an alternative gas was produced from automobile tyre wastes by the means of a controlled pyrolysis. To do so, a novel catalytic system was designed with the aim of increasing the rate of conversion and improving the quality of the pyrolysis products. This work aimed also to reduce the severity of the overall reactions, by using powder catalysts (MgO, Al2O3, CaCO3, and zeolite ZSM-5) uniformly distributed on two layers of oyster shells (OS) particles. The catalyst/tyres mass ratio was kept for all the tests at 1/30. The pyrolysis reactor was maintained at 500°C and the influence of each catalyst and of the number of shell beds (0, 1 or 2), on the yield and composition of the derived products, was examined. The gas yields could contribute by 1.2% of total consumption in Tunisia. Furthermore, some combinations could upgrade the derived gas and made it possible to use it as such or with the minimum of post-treatment. It was found that, with the use of supported catalyst, the gas produced is 45% greater compared to classical thermal pyrolysis. The Heating value of the produced gas was also improved by the use of supported catalysts; it was found 16% greater with the use of Al2O3/OS compared to non-catalytic pyrolysis. When compared to the gas obtained from only one catalytic supported bed, the sulfur content was reduced by 80% with the use of CaCO3/OS on two catalytic beds.

Abstract Background Malaria and dengue are the two major vector-borne diseases in Mizoram. Malaria is endemic in Mizoram, and dengue was first reported only in 2012. It is well documented that climate change has a direct influence on the incidence and spread of vector-borne diseases. The study was designed to study the trends and impact of climate variables (temperature, rainfall and humidity) in the monsoon period (May to September) and deforestation on the incidence of dengue and malaria in Mizoram. Methods Temperature, rainfall and humidity data of Mizoram from 1979–2013 were obtained from the National Centers for Environmental Prediction Climate Forecast System Reanalysis and analyzed. Forest cover data of Mizoram was extracted from India State of Forest Report (IFSR) and Land Processes Distributed Active Archive Centre. Percent tree cover datasets of Advanced Very High Resolution Radiometer and Moderate Resolution Imaging Spectroradiometer missions were also used to study the association between deforestation and incidence of vector-borne diseases. The study used non-parametric tests to estimate long-term trends in the climate (temperature, rainfall, humidity) and forest cover variables. The trend and its magnitude are estimated through Mann-Kendall test and Sen's slope method. Year-wise dengue and malaria data were obtained from the State Vector Borne Disease Control Program, Mizoram. Results The Mann-Kendall test indicates that compared to maximum temperature, minimum temperature during the monsoon period is increasing (p < 0.001). The Sen’s slope estimation also shows an average annual 0.020C (0.01–0.03 at 95% CI) monotonic increasing trend of minimum temperature. The residuals of Sen’s estimate show that temperature is increasing at an average of about 0.10C/year after 2007.Trends indicate that both rainfall and humidity are increasing (p <. 0.001); on an average, there is a 20.45 mm increase in monsoon rainfall per year (5.90–34.37 at 95% CI), while there is a 0.08% (0.02–0.18 at 95% CI) increase in relative humidity annually. IFSR data shows that there is an annual average decrease of 162 sq.km (272.81–37.53 at 95% CI, p < 0.001) in the dense forest cover. Mizoram in 2012 was the last state in India to report the incidence of dengue. Malaria transmission continues to be stable in Mizoram; compared to 2007, the cases have increased in 2019. Conclusion Over the study period, there is an ~ 0.80C rise in the minimum temperature in the monsoon season which could have facilitated the establishment of Aedes aegypti, the major dengue vector in Mizoram. In addition, the increase in rainfall and humidity may have also helped the biology of Ae. aegypti. Deforestation could be one of the major factors responsible for the consistently high number of malaria cases in Mizoram.

Abstract Drinking water is a necessity not only for humanity but also for the all living organisms available in the earth today. But the availability of the potable water is not in abundant amount; hence clean water is scarce in the world today. Solar desalination system is used to turn the saline water into the freshwater by use of sunrays. Solar still is a device which can be employed for desalination. As the daily productivity of solar distiller is low so, multiple techniques have been used by various researchers to improve its productivity. But work done on the fins to enhance the distillate output is not much. Fin is a low-cost heat transfer enhancement which is used by many researchers in the solar thermal applications. Present review paper shows the use of fins in solar still and how it can be used to enhance the distillate output of solar still. At last, a table is also presented to show the use of fins to increase the distillate output alone and with the use of certain materials.