Hasil untuk "Environmental technology. Sanitary engineering"

I. Made Wahyu Wijaya, I. G. D. Yudha Partama, I. Ketut Sumantra, Kailas Deoram Ahire and Fransiskus Vebrian Kenedy

This study explores the spatiotemporal variations in nitrogen and phosphorus pollutants in the Tukad Badung River, an essential water source for Bali’s communities, increasingly impacted by agricultural, domestic, and industrial discharges. Bi-daily sampling at six strategically selected sites along the river’s 18-kilometer stretch revealed substantial fluctuations in water quality, with downstream sites consistently exhibiting elevated pollutant concentrations. Ammonia concentrations varied from 1.5 to 4.2 mg.L-1, nitrate levels ranged from 5.0 to 11.6 mg.L-1, and total phosphorus concentrations spanned 0.5 to 2.5 mg.L-1, all of which were highest during afternoon sampling, likely due to reduced flow and increased anthropogenic inputs. Total suspended solids (TSS) exhibited temporal and spatial variability, ranging from 80 to 127 mg.L-1, with the highest concentrations observed at midstream sites, suggesting localized sedimentation from human activities. The nutrient dynamics displayed marked temporal variations, with concentrations rising during afternoon hours, reflecting shifts in human activity and changes in river flow conditions. Furthermore, the study assessed nutrient recovery technologies, such as precipitation and adsorption, which were able to recover up to 80% of extractable nutrients. These findings not only characterize the pollution trends but also highlight the potential of nutrient recovery techniques in reducing dependency on synthetic fertilizers. This research emphasizes the need for integrated watershed management and adaptive recovery strategies to mitigate nutrient pollution and enhance the sustainability of river ecosystems for future generations.

Hector Garcia-Gonzalez, Pablo Menendez-Cabo

Underground mining environments present elevated occupational health risks, primarily due to substantial exposure to diesel exhaust emissions within confined and poorly ventilated spaces. This study assesses the real-world performance of two advanced retrofit emission control systems—Proventia NOxBuster and Purifilter—installed on underground mining trucks operating in a Spanish mine. Emissions of carbon monoxide (CO), nitric oxide (NO), and nitrogen dioxide (NO₂) were quantified using a Testo 350 multigas analyser, while ultrafine particle (UFP) concentrations were measured with an Engine Exhaust Particle Sizer (EEPS-3090) equipped with a thermodiluter. Controlled tests under both idling and acceleration conditions revealed substantial reductions in pollutant emissions: CO decreased by 60–98%, NO by 51–92%, and NO₂ by 20–87%, depending on the system and operational phase. UFP concentrations during idling dropped by approximately 90%, from 542,000 particles/cm³ in untreated trucks to below 50,000 particles/cm³ in retrofitted vehicles. Under acceleration, the Proventia NOxBuster achieved reductions exceeding 95%. Conversely, Purifilter-equipped trucks exhibited a counterintuitive increase in UFPs within the 5.6–40 nm range, potentially due to ammonia slip events during selective catalytic reduction (SCR). Despite these discrepancies, both systems demonstrated considerable mitigation potential, albeit highly dependent on exhaust temperature (optimal: 200–450 °C), urea dosing precision, and maintenance protocols. This work underscores the necessity of in situ performance verification, regulatory vigilance, and targeted intervention strategies to protect underground workers effectively. Further investigation is warranted into the long-term health benefits, system durability, and nanoparticle emission dynamics under variable load conditions.

Kibebework Getachew, Wuletawu Abera, Tefera Belay et al.

Land degradation in Ethiopia is a pressing issue that demands immediate attention. Although various sustainable land management options have been introduced through top-down approaches, farmers have shown low adoption rates. The objective of this research was to assess the community prioritization of landscape restoration technologies and the appropriation of ecosystem services in the Basona-Worena and Doyo-Gena woredas of Ethiopia. The evaluation of land management option tool was used to survey farmers' preferences and compare different land management options based on input, cost, perceived advantages, and potential drawbacks.Data from 64 participants revealed that farmers were interested in a wide range of benefits. However, their top three preferences were increased food supply, enhanced soil fertility, and improved water supply. The study emphasized the need for site-specific land management measures. Farmers in Basona-Worena favored terrace and bund practices, while farmers in Doyo-Gena preferred exclosure and agroforestry practices. Conversely, the propensity of terracing to attract rodents and pests, the lengthy time takes to see results from bunding, and the cost of gabions were among the shortcomings that farmers identify in conservation techniques. Terracing was the first option for supplying fundamental ecosystem services in both locations, followed by biological measures, water percolation pits, and bunds. All farmers ranked the business-as-usual option as their least preferred option because they perceived it to have limited potential for yielding desired benefits. These findings provide a robust model for informed decision-making on suitable restoration technologies, holding promise for landscape restoration initiatives in Ethiopia and similar locations worldwide.

Cláudio Luis de Araújo Neto, Daniel Epifânio Bezerra, Laércio Leal dos Santos et al.

A disposição dos Resíduos Sólidos Urbanos (RSU) constitui uma das principais problemáticas da sociedade moderna, abrangendo aspectos econômicos, sociais e ambientais. Diante desse contexto, este trabalho tem por objetivo avaliar o potencial econômico dos resíduos passivos para a reciclagem na cidade de Campina Grande - PB. A metodologia deste trabalho foi segmentada em três etapas. A primeira etapa compreendeu o levantamento de dados da cidade de Campina Grande - PB. A segunda etapa abrangeu a caracterização gravimétrica dos resíduos sólidos urbanos que são gerados em Campina Grande e depositados no aterro sanitário. E na terceira etapa houve o processamento das informações obtidas nas etapas anteriores para analisar o potencial econômico dos resíduos recicláveis. Os resultados obtidos demonstraram que os resíduos sólidos urbanos gerados em Campina Grande e destinados para o aterro sanitário possuem um potencial econômico considerável, tendo em vista que 86 toneladas de resíduos passíveis de reciclagem são encaminhados ao aterro sanitário e poderiam gerar uma receita de R$ 25.956.000,00 ao ano.

Alireza Askarian, Mahnaz Mirza Ebrahim Tehrani, Seyed Mohammad Taghi Sadatipour et al.

Introduction: Unit risk management is a critical component of gas refining management, as risks that are not well-managed may lead to trip production failures. The present study aimed to provide a structural model for investigating the role and effect of different variables on stopping the gas production process in the gas refinery. Material and Methods: This study was a retrospective cross-sectional and systematic analysis, which was carried out on key risks in the trip gas sweetening unit in a gas refinery industry located in Asaluyeh, Iran. The systems analysis was applied by using Fishbone Diagram, and then data modeling was prepared by Structural Equation Modeling (SEM) for an incident that occurred during gas sweetening production. Tools for the data analysis included the SPSS 24 and Smart PLS 2 software. Results: Results of this research indicate that “Environment Risk” with a path coefficient of 0.943 and T- Value of 103.791; “Cost Risk” with a path coefficient of 0.937 and T- Value of 95.168; “Implementation of management system Risk” with a path coefficient of 0.847 and T- Value of 35.23; “Accident Risk” with path coefficient of 0.577 and T- Value of 25.410; “Time Risk” with path coefficient of 0.758 and T- Value of 15.121; “Human Error Risk” with path coefficient of 0.712 and T- Value of 11.215 had the most important coefficients of the paths respectively, that are effective in stopping production concerning other risks. Also, by comparing the path coefficients of the risks we can see that the impact of each of the risks on stopping production is different. Conclusion: The findings of the present study revealed that a combination of variables can affect stopping production in the gas industry. Therefore, the role of these risks in losses in the refinery system should be investigated.

Nurhafizah Mohd Selihin, Meng Guan Tay

The future prospect in wastewater treatment technologies mostly emphasizes processing efficiency and the economic benefits. Undeniably, the use of advanced oxidation processes in physical and chemical treatments has played a vital role in helping the technologies to remove the organic pollutants efficiently and reduce the energy consumption or even harvesting the electrons movements in the oxidation process to produce electrical energy. In the present paper, we review several types of wastewater treatment technologies, namely micro-nanobubbles, hybrid electro-Fenton processes, photocatalytic fuel cells, and microbial fuel cells. The aims are to explore the interaction of hydroxyl radicals with pollutants using these wastewater technologies, including their removal efficiencies, optimal conditions, reactor setup, and energy generation. Despite these technologies recording high removal efficiency of organic pollutants, the selection of the technologies is dependent on the characteristics of the wastewater and the daily production volume. Hence the review paper also provides comparisons between technologies as the guidance in technology selection. HIGHLIGHTS The important of hydroxyl radicals in water treatment.; Fuel cell for energy recovery.; Satisfactory high removal efficiency of organic pollutant.; Materials used and factors affecting treatment efficiency and energy recovery.; Sustainable energy supply from wastewater.;

Monika Motaghi, Ali Asghar Heidary, Lida Gholizadeh

Background: The capacity to absorb knowledge and manage organizational talent and performance is important to the survival of organizations. The aim of this study was to investigate the relationship between knowledge absorptive capacity and talent management with the performance of the organization. Methods: This applied research used the causal design. The statistical population and sample size were 500 and 217 nurses, respectively.  Three standard questionnaires were used to collect data.  The knowledge absorption capacity questionnaire had Cronbach's alpha 0.705 and included 19 items. Moreover, the organizational innovation variable of the Atlay and Akif questionnaire with Cronbach's alpha 0.795 and 18 items, Hersi and Goldsmith with Cronbach's alpha of 0.762 with 42 items, and Phillips and Rapper with 28 items were used for the talent management component. Data were imported to SPSS20 and analyzed using PLS Descriptive and inferential statistics. Results: The mean age of participants was 24.3±4.5.3 years, 52.54% of nurses were male and 42.46% were female. Also, 61.75% of nurses had a bachelor's degree and 38.15% had an MSc degree. Mean±SD of knowledge acquisition capacity was 17.56±4.63, that of talent management was 17397±4.87, that of organizational innovation was 18.22±4.65. and that of organizational performance was 18.39±4.95. Knowledge acquisition capacity, and talent management had a significant relationship with innovation and organizational performance (1.96<2.57, 3.8, 5.41 and 2.63), and organizational innovation was also correlated with organizational performance (1.96<2.94). According to the results of the Sobel test, the capacity to absorb knowledge and talent management was related to organizational performance with the mediating role of organizational innovation (1.96<2.45 and 3.21). Conclusion: Given the relationship between knowledge absorptive capacity and talent management with organizational performance, managers should be able to effectively improve the capacity to absorb knowledge and spread it throughout the organization.

Maria Jacome, Vincenzo Costanzo-Alvarez, Milagrosa Aldana et al.

DOMMANGET, Fanny, JAUNATRE, Renaud, EVETTE, André et al.

Prévenir l’installation d’espèces exotiques envahissantes suite à un remaniement de sol ou gérer des milieux envahis par des populations monospécifiques pour réinstaller une certaine biodiversité sont des objectifs de gestion incontournables en restauration écologique. L’écologie des communautés, en s’intéressant aux mécanismes d’assemblage des espèces, peut inspirer des solutions de gestion. S’appuyant sur l’exemple du Buddleia du père David (Buddleja davidii Franchet), cet article présente des avancées scientifiques issues de l’écologie des communautés et les applique à la prévention et à la restauration de zones envahies par cet arbuste originaire de Chine.

Laith A. Naji, Ayad A.H. Faisal, Hayder M. Rashid et al.

Wipapan Adulcharoen, Kallaya Suntornvongsakul, Yang-Soo Lee

Understanding the function of the ecological restoration of mangrove forests leads to appropriate sustainable utilization (SU) of ecosystem services (ES) during development stages of mangrove ecosystem for sustaining the local livelihood and maintaining the mangrove ecological production. The study aims to identify the SU which was changed relying a development of ES at Klong Khone (KK) Sub-district, Samut Songkhram Province, Thailand. The SU was collected by in-depth interview with 20 key respondents, questionnaires survey with 140 fishermen and statistical scientific data on developed mangrove forest areas. Descriptive statistics and event analysis were employed to analyze the data. The study found that bottom-up management tools based on a local people’s participation were applied to determine a way of harvest of ES. An application of these local tools including a common property right, land use zoning, application of local knowledge, human resources, and financial and technological transfer resulted in different utilizing activities of ES during the development of mangrove forest restoration stages. The results showed that the ES produced during mangrove stand initiation stage were mainly harvested for food (90%) and during the young forest regrowth stage (87%) (N = 140). They were also widely used for operating aquaculture during mangrove stand initiation stage (39%), but they were harvested with more concerns about environmental impacts during the young forest regrowth stage (47%) (N = 140). The cultural services during young forest regrowth stage were increasingly utilized for diversified incomes from ecotourism (46%) and education learning program (50%) (N = 140). The ES from developed mangrove forest were harvested effectively based on an application of SU tools which were locally developed by local people’s participation. The SU tools can be proposed and applied in other communities where have similar ecological, social and cultural conditions as KK sub-district to support the SU of ES.

Abhinav Srivastava, Arnab Mondal, N.A. Siddiqui and S.M. Tauseef

Air pollution is becoming a major environmental and public health problem worldwide. Exposure to different air pollutants has several adverse effects on human health. In the present study, we attempt to determine the concentration of respirable suspended particulate matters (RSPMs) and levels of the heavy metals in ambient air of Dehradun city. The RSPM concentration of all the areas under study were well under the NAAQ standard limit. The Ghantaghar area reported the maximum RSPMs of 87.5507 ?g.m-3. The samples collected from four different locations of Dehradun were primarily analysed for heavy metals like Pb, Fe, Cr and Cd using atomic absorption spectrophotometer. The measured concentrations were compared with the standard safe limits provided by United States Environmental Protection Agency (USEPA). It is seen that all the heavy metals, as well as the RSPM, are well under permissible safe limits set by USEPA, OSHA, and CPCB. It can, therefore, be concluded that the ambient air quality of Dehradun, in terms of heavy metal contamination as well as RSPM concentration in air is safe. Strict monitoring of heavy metal emissions in air should be done regularly to maintain the ambient air of Dehradun area as healthy.

D. Vlasov, Fsue “RosRAO”, D. N. Zamaskin et al.

The article discusses one of today’s challenges, namely, the decommissioning of nuclear power facilities. It summarizes the experience in the decommissioning of radioactive waste storage facilities belonging to RosRAO’s Murmansk department branch of the Northwest Territorial District providing detailed overview of pre-decommissioning activities, as well as the decommissioning operations themselves, relevant technology and technical equipment applied. Pre-decommissioning stage involved large-scale efforts (2011—2015) on accumulated RW identifi cation and its inventory taking, as well as a comprehensive engineering radiation survey. Decommissioning projects have been developed and approved, a state environmental examination has been carried out with a Sanitary and Epidemiological Statement on compliance with state sanitary and epidemiological rules and regulations issued by FMBA of Russia. The paper presents the practice of constructing some engineering structures to provide additional safety and security of RW storage facilities during their dismantlement. Particular attention was paid to the problems associated with the use of special equipment.

Isabel Campos Salles Figueiredo, Natália Cangussu Duarte, Raúl Lima Coasaca et al.

Na perspectiva do saneamento ecológico, as águas cinzas representam um valioso recurso que pode ser aproveitado na agricultura. No Brasil, porém, ainda são incipientes os dados sobre a geração e características desse tipo de efluente. O presente estudo apresenta um diagnóstico sobre a segregação e a disposição do esgoto realizada em uma comunidade rural de Campinas (SP). Foi encontrado que em mais de 90% dos domicílios existia a separação das águas cinzas, sendo a aplicação no solo ou em áreas de plantação de frutíferas as formas de destinação em 87% dos casos. A fonte da água cinza influencia fortemente sua composição. O efluente da cozinha destacou-se pelos valores elevados de DQO, SST e turbidez, superando os valores médios típicos para esgoto sanitário. A água cinza proveniente do chuveiro apresentou alta concentração de NTK, devido ao hábito de urinar no banho. Aquelas provenientes da lavanderia possuíam maior pH e condutividade elétrica devido aos sabões e produtos de limpeza nela presentes.

A. Luke, B. F. Sanders, B. F. Sanders et al.

Flood hazard mapping in the United States (US) is deeply tied to the National Flood Insurance Program (NFIP). Consequently, publicly available flood maps provide essential information for insurance purposes, but they do not necessarily provide relevant information for non-insurance aspects of flood risk management (FRM) such as public education and emergency planning. Recent calls for flood hazard maps that support a wider variety of FRM tasks highlight the need to deepen our understanding about the factors that make flood maps useful and understandable for local end users. In this study, social scientists and engineers explore opportunities for improving the utility and relevance of flood hazard maps through the co-production of maps responsive to end users' FRM needs. Specifically, two-dimensional flood modeling produced a set of baseline hazard maps for stakeholders of the Tijuana River valley, US, and Los Laureles Canyon in Tijuana, Mexico. Focus groups with natural resource managers, city planners, emergency managers, academia, non-profit, and community leaders refined the baseline hazard maps by triggering additional modeling scenarios and map revisions. Several important end user preferences emerged, such as (1) legends that frame flood intensity both qualitatively and quantitatively, and (2) flood scenario descriptions that report flood magnitude in terms of rainfall, streamflow, and its relation to an historic event. Regarding desired hazard map content, end users' requests revealed general consistency with mapping needs reported in European studies and guidelines published in Australia. However, requested map content that is not commonly produced included (1) standing water depths following the flood, (2) the erosive potential of flowing water, and (3) <i>pluvial</i> flood hazards, or flooding caused directly by rainfall. We conclude that the relevance and utility of commonly produced flood hazard maps can be most improved by illustrating pluvial flood hazards and by using concrete reference points to describe flooding scenarios rather than exceedance probabilities or frequencies.

F. REY, D. RICHARD

GEMAPI : vers une gestion plus intégrée de l'eau et des territoires - Avant-propos

D. Barloková, Ján Ilavský, O. Kapusta et al.

A. Muhammad, A. Muhammad, K. Goda et al.

This study develops tsunami evacuation plans in Padang, Indonesia, using a stochastic tsunami simulation method. The stochastic results are based on multiple earthquake scenarios for different magnitudes (<i>M</i>_w 8.5, 8.75, and 9.0) that reflect asperity characteristics of the 1797 historical event in the same region. The generation of the earthquake scenarios involves probabilistic models of earthquake source parameters and stochastic synthesis of earthquake slip distributions. In total, 300 source models are generated to produce comprehensive tsunami evacuation plans in Padang. The tsunami hazard assessment results show that Padang may face significant tsunamis causing the maximum tsunami inundation height and depth of 15 and 10 m, respectively. A comprehensive tsunami evacuation plan – including horizontal evacuation area maps, assessment of temporary shelters considering the impact due to ground shaking and tsunami, and integrated horizontal–vertical evacuation time maps – has been developed based on the stochastic tsunami simulation results. The developed evacuation plans highlight that comprehensive mitigation policies can be produced from the stochastic tsunami simulation for future tsunamigenic events.

سیدابوالفضل مسعودیان, محمدصادق کیخسروی کیانی

The aim of this study is to examine the changes of snow-covered days in the elevation levels of Zayanderoud River Basin. The MODIS Terra and MODIS Aqua data were applied in the resolution of 500 × 500 m in the daily time scale from 2003 to 2014.  A Digital Elevation Model of the Basin that was the same as snow data both in spatial resolution and projection system was extracted over the Basin. To explore the trend for snow-covered days for each of the elevation levels, first the frequency of snow-covered days was calculated over each of the elevations from 1500 to 3850 meters at the intervals of 50 meter and then the trend was examined using Mann-Kendall trend test. The investigations showed that in April and May the number of snow-covered days indicates a decreasing tendency in the high elevation levels of the Basin. In the months of November and December, the number of snow-covered days has shown a positive tendency over many of the elevation levels. The examinations of changes in precipitation regimes show that the shares of precipitation in the fall months have increased while the shares of winter months have decreased. It seems that the variation of precipitation shares have influenced the snow cover regime of the Basin, and snow cover decreasing trend accompanied by changes in the regime could have adverse effects for the Basin.

Yanyan Zhang, M. S. Islam, K. McPhedran et al.