Environmental Challenges最新文献

In this research, organic waste was subjected to hydrothermal carbonization (HTC) using faecal sludge as the water source. HTC is a sustainable method for converting organic waste into valuable hydrochar. However, the use of portable water as a reaction medium in HTC is environmentally unsustainable and increases operational costs. The aim of this study was to optimize HTC operating parameters such as residence time, temperature, and biomass to water (BTW) ratio for maximizing both higher heating value (HHV) and hydrochar yield and also to determine the effects of these operating parameters on the hydrochar properties. This study utilized a Box Behnken design within the response surface methodology to identify optimal HTC conditions. Temperature was varied between 180 and 250 °C, residence time between 30 min and 120 min, and BTW ratio between 1 and 10. Volatile matter percentage was reduced in the hydrochar compared to that of the feedstock. A progressive rise in carbon percentage and a decline in oxygen percentage were observed with increasing temperatures. Temperature and residence time were the most significant factors affecting HHV, on the other hand, temperature and BTW ratio were the most significant factors that affected hydrochar yield. Numerical optimization of the factors revealed that a maximum HHV of 28.409 MJ/kg was obtained at 250 °C, 116 min, and a 1:9 BTW ratio, while an ideal hydrochar yield of 57.491% was obtained at 242 °C, 95 min and a BTW ratio of 1:9. This study highlights the environmental sustainability of utilizing faecal sludge as a water source in HTC, presenting a promising possibility for transforming organic waste into valuable hydrochar while addressing concerns related to water use.

Assessing the sustainability of watersheds holds significant importance for regional natural resource management and to achieve sustainable development. This study investigated the sustainability of the Wulo Abiye watershed, central highlands of Ethiopia. The sustainability status of the watershed was evaluated by using 17 indicators representing the economic, social, and environmental dimensions of sustainable development goals (SDGs) based on the local and existing conditions of the watershed. The results indicated that environmental sustainability was at 'high' level, while social and economic sustainability and the aggregate index were at ‘moderate’ levels. The overall level of community participation in the planning and evaluation phases of watershed management was at 'low' levels. The implementation phase was at 'high' level. Overall, the sustainability status of watershed management and level of community participation were at ‘moderate’ levels. The study concluded that integrated support is needed to overcome the identified challenges to achieve sustainable development in watersheds.

Thiamethoxam is a globally used neonicotinoid insecticide in mango ecosystem which can cause hazardous impact on soil environment. The current study was carried out to assess the impact of 0.2 (T₁/treament) and 2.0 g kg⁻¹ (T₂) concentrations of thiamethoxam on mango rhizospheric microbial community, enzyme activity along with its degradation. Indigenous microflora degraded thiamethoxam from 5.62 to 41.17 mg kg⁻¹ at 0 day to 0.60 and 2.10 mg kg⁻¹ in soil after 60 days of application of 0.2 and 2.0 g kg⁻¹ doses, respectively. Thiamethoxam dissipated via pseudo first-order kinetics with t_1/2 (half-life) values (23.00 and 14.00) days and K values (1.99–17.14) and (21.42–183.6) at T₁ and T₂, respectively. At bacterial count of 5.5 × 10⁷ in soil, fluorescein diacetate (FDA) and dehydrogenase (DHA) showed that there was no change occurred in control soil after 60 days, while in thiamethoxam treated soil DHA was marginally increased from 0.164 to 0.168 µg g⁻¹ and from 0.155 to 0.157 µg g⁻¹ at lower and higher doses, respectively. While, FDA values were slightly decreased from 0.761 to 0.717 µg g⁻¹ at T₁ but no significant change was observed in T₂. However, changes in fungal population were not significant but increase in bacterial population with the degradation of thiamethoxam was observed, which indicated the presence of thiamethoxam degrading beneficial bacteria in mango rhizosphere soil.

The resilience of riparian and char land communities in Bangladesh is greatly challenged by climate change extremes with its accompanying hazards, resulting an adverse effect on their livelihoods and general well-being. This study investigated the resilience capacity of riparian and char land communities, explicitly focusing on the impacts of increasing climatic extremes like floods, riverbank erosion, and variability of precipitation. The aim was to develop an indicator-based Resilience Capacity Index (RCI) score to get a deeper understanding of the resilience ability of the people residing in Sundarganj (Gaibandha) and Chilmari (Kurigram) in Northern Bangladesh, which are known for being highly vulnerable to various climatic hazards due to riparian and char land settings. A total of 272 households (136 from Chilmari and 136 from Sundarganj) were surveyed using non-probability purposive sampling to collect socio-demographics, livelihoods, social networks, health, food, and water security data. The contributing elements (sensitivity and adaptive capacity) were combined to determine the Resilience Capacity Index (RCI). The RCI score of 0.245 observed for households on the riverine mainland (Sundarganj) exhibited a statistically significant increase compared to the score of 0.215 for households in the char (Chilmari). The lower scores have been indicating that communities are unable to effectively adapt to the impacts of climate extremes and its associated hazards in both areas. This can be attributed to a need for more available adaptation opportunities and unfavourable socio-economic conditions. Several factors, such as livelihood strategies, education, and access to essential services, including food, water, and health, drive the ability for resilience and improve the potential to assist the most vulnerable riparian households in Bangladesh. This would allow policymakers to ensure climate adaptation strategies that are appropriately focused on preventing the charland and riverine communities from the negative consequences of natural disasters.

This research investigates the intricate relationships between Eco-Control, Eco-Friendly Technologies, Green Investment, Business Innovation, and Corporate Sustainability within the Indonesian manufacturing landscape. The primary objective is to shed light on the interplay of these factors in achieving sustainable business practices. This study employs a quantitative approach, gathering data from a diverse sample of 160 manufacturing companies in Tangerang City, Indonesia, spanning eight sectors. Each sector contributes 20 top management representatives, providing insights into their respective Green Investment, Business Innovation, and Corporate Sustainability practices. The analysis supports the acceptance of hypotheses relating to these constructs' direct and mediating relationships. Green Investment is pivotal in mediating the path from Eco-Control and Eco-Friendly Technologies to Corporate Sustainability. These findings offer valuable insights for businesses in Indonesia, highlighting the importance of Green Investment and Business Innovation in fostering Corporate Sustainability. Practical implications suggest the need for strategic investments in green initiatives and innovation. Despite comprehensive sampling, this study acknowledges potential data accuracy and generalizability limitations. This study recommends further research to explore nuances across sectors and enhance understanding of sustainable practices.

This study examined lake Rukwa's hydrochemical characteristics and heavy metal levels (ecological and health hazards). Results showed that the pH ranged from 8.83 to8.95, EC ranged from 1470 to 1572.22 µS/cm, and TDS ranged from 1053.04 to 1262.63 Mg/l. The findings revealed that lake Rukwa is characterized by Na-K-HCO₃ water chemical type. Gibb's diagram revealed that rock weathering and evaporation regulate water's chemical composition. The calcite and sepiolite precipitation enriches the water with Na-CO₃-SO₄-Cl. The study suggests silicate mineral weathering, rock-water interactions, direct ion exchange, and secondary mineral precipitation govern the geochemical evolution of lake Rukwa. The results also revealed that 30% of samples had moderate ecological risk (30 < RI < 60), whereas 70% had severe risk (60 < RI < 120). The oral hazard quotient (HQ) values for lead (Pb) in children were significantly higher (HQ > 1) at all locations, indicating a potential health risk. However, the dermal HQ values were found to be within acceptable levels. Most sites had acceptable Hazard Index (HI) values, except for Pb in children and adults. In Monte Carlo simulations, heavy metal HQ values were below standard limits, except for oral Pb exposure, which exceeded 1 for adults (7.29E-04) and children (2.79E-03). The average CR values for oral and dermal Pb in adults (7.29E-04, 3.47E-04) and children (2.79E-03, 1.02E-03) exceeded 1.0E-04, suggesting carcinogenic potential. These findings highlight significant oral and dermal carcinogenic hazards from Pb exposure to lake Rukwa and the necessity for effective comprehensive measures to mitigate these risks.

This paper aims to present a comprehensive assessment of the evolution of environmental law in Puerto Rico from 1897 to 2021. The study identifies significant legislative developments, with a surge in federal and local laws post-1960, correlating with heightened environmental awareness. Political dynamics, notably party affiliations, significantly influence the level of legal protection afforded to the environment. A new classification system is introduced to analyze laws based on ecosystem and resource protection. Distinct periods of legislative activity are identified, with federal laws predominant from 1960 to 1990 and state laws from 1990 to 2021, revealing a unique pattern of legislative "pulses." Federal laws primarily address coastal ecosystems and pollution mitigation, while state laws focus on land ecosystems, reserves, and resource management. The study establishes a statistically significant correlation between the passage of time and the number of enacted laws, indicating an upward trend in environmental legislation. Additionally, it highlights the impact of political parties on lawmaking, with variations in legislative output observed under different party control scenarios. The study found that the legislative output in both the US and Puerto Rico was affected by party control. Specifically, when the Republican Party or the local Popular Democratic Party controls the House of Representatives or the Senate, the output of environmental legislation decreases. On the other hand, the study suggests that the US President's party identity has a lesser effect on enacting environmental laws. The study underscores the intricate relationship between politics and environmental policy, emphasizing the significance of political dynamics in shaping environmental law. The findings offer valuable insights for policymakers, environmentalists, and stakeholders, aiding in developing more effective strategies for sustainable development and conservation in Puerto Rico. Recommendations include utilizing the comprehensive table of environmental regulations to detect agency overlaps and investigate the correlation between legal protection and ecosystem health.

To control the increasing growth of rat populations in metropolitan areas, several factors need to be considered to mitigate the risks posed by rats. Identifying rat density hotspots with more efficient methods and assessing people's experiences and attitudes toward them can be useful in prioritizing rat control efforts. We focused on the two most common species of rats (Rattus rattus and Rattus norvegicus) in the metropolis of Karaj, the fourth most populous and the largest immigrant-friendly city in Iran. The urban rat infestation is one of the problems caused by the high population growth in Karaj and the insufficient development of urban infrastructure and waste collection. It has led to discontent and public concern about rat infestations and there is a need to address the associated threats. We applied the Kernel Density Function and Optimized Hotspot Analysis to the presence points of the aforementioned types of rats and found that while Optimized Hotspot projects a macro view of hotspots at the city level, the Kernel Density Function prioritizes neighborhoods for initial actions. In addition, social network analysis with complementary regression models was conducted to determine people's experiences. The results show that fear of rats and concern about their presence form the basis of people's attitudes toward rats and lead to feelings of hatred. Moreover, economic harm reinforces people's motivation to control or eliminate this species. Despite their unpleasant feelings toward rats, people have a great influence on the growth of rat infestations by creating food sources through improper waste disposal. They prefer to use traps and poison instead of disposing of household waste and following the principles of cleanliness as preventive measures and believe that the lack of proper garbage collection by the municipality is the most important reason for the growth of rat populations. They are not sufficiently aware of their position in addressing this crisis. Our findings argue for the formation of a stronger network between the relevant authorities and residents, especially those living in the hotspots, to educate them about their role in rat control and to gain their cooperation in improving the city's waste management system.

Transitioning fundamental and applied science to evidence-based real-world applications is challenging yet necessary, especially in environmental sciences. In this paper, a quantitative data analysis method is presented to support decision-making by augmenting qualitative customer discover methods used for new technology adoption. This method can be used to assess: i) customer segment (CS) and value proposition (VP) validity and ii) the ability of a new technology to address the VP. Two different environmental technologies were evaluated to demonstrate this quantitative approach. CS and VP(s) that were previously qualitatively identified were statistically (in)validated using binomial testing. In each of the presented cases, the CS was statistically validated but only one of the three VPs for each case was validated. The validated performance parameters for each technologywere tested against cost and performance data using linear optimization. This testing allowed for the identification of conditions under which the technology met minimum customer performance requirements and where further data or technology modifications were still needed. These identified conditions establish the features necessary to transition the technologies to the minimum viable product (MVP) phase of commercialization. One technology was found to be ready for MVP development while the other technology needed additional data and modification. Both findings demonstrate the effectiveness of this quantitative data analysis method and guide decision-making in the early stages of technology commercialization.

This meta-empirical study delves into the conflicts between Sweden and its forestry industry in response to the EU-commission's demands for sustainable forest management. Combining theoretical foundations with empirical analysis of existing research, this study grounds itself in a clear definition of forests as intricate, adaptive, and ever-evolving systems. The central research question revolves around the efficacy of Sweden's guiding principle, "freedom under responsibility," in shaping forest policy and fostering long-term sustainability.

To dissect the core of this conflict, two fundamental hypotheses are explored. The first centers on the clash of interests between the Swedish government and forest industry stakeholders, while the second delves into the tension between monetarily valued ecosystem services and those without a market value, a natural market being absent. These questions are scrutinized using a novel method tailored for conflict analysis. A model article and two specific analysis articles are developed, each focusing on distinct facets of forest management, and are subsequently compared to reveal insightful contrasts.

This contrasting approach unveils a comprehensive socio-economic framework underlying these conflicts—a framework that often remains concealed due to deeply ingrained patterns of thought and behavior within homogeneous groups. The method's greatest strength lies in its ability to render the invisible visible and the "silent" audible. It clarifies what might be obscured in the model article, bringing the contours of the conflict into sharp relief.

The study findings affirm the value and democratic nature of the "freedom under responsibility" principle. However, for it to yield the intended outcomes, substantial and continuous educational efforts directed at relevant forest management stakeholders are imperative. This meta-empirical study highlights the necessity of a robust educational campaign to ensure the principle's success.

Moreover, this study contributes theoretical insights that could serve as a foundation for conflict resolution:

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  Forests are complex, adaptive, and dynamic systems.

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  Human intervention prompts responses and adaptations within this system.

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  The choice of management strategies plays a pivotal role in achieving specific outcomes, whether biomass production or the preservation of natural forest characteristics.

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  The production of forest ecosystem services necessitates active management and does not occur automatically.