Sustinere: Journal of Environment and Sustainability
Not a member yet
183 research outputs found
Sort by
The potential of green mussel shells (Perna viridis) as an alternative calcium source in the cement industry
No full textGreen mussel shells (GMSs) are a potential source of calcium oxide for the cement industry. As the largest producer of shells in Asia, Indonesia generates an annual production of 309,886 tons, with approximately 70% of this comprising shell waste. Addressing this issue is crucial to reducing environmental pollution and fistering innovation in eco-friendly cement production. This study aims to explores the extraction of calcium carbonate (CaCO3) from GMSs through a 4-hour calcination process at temperatures of 700°C, 800°C, and 900°C. Analytical methods, including titrimetric analysis and X-ray fluorescence revealed that GMS flour contains 98.16% calcium oxide (CaO). X-ray diffraction analysis at 900°C identified CaCO3 phases consistent with ICDD data No. 01-070-9854, with diffraction peaks observed at 2θ values of 29.4°, 32.21°, and 37.37° (100%). Compressive strength tests further demonstrated that incorporating 10% GMS-derived material into cement increases its compressive strength by 2.3%. These findings highlight the potential of GMSs as an alternative raw material for the cement industry. Maximizing shell waste utilization not only mitigates environmental impact but also supports more sustainable and environmentally friendly cement production. This approach represents a significant advancement in waste management innovation and the development of green solutions in the construction sector
Corporate Environmental Reporting: Do Firms Operating in Environmentally Sensitive Sectors Disclose Enough?
No full textCorporate environmental disclosure has been increasing steadily as it is an essential factor for sustainable development. However, this factor seems to be insufficientl recognised within the Nigerian corporate world. The objective of this study is to assess the level of corporate sustainability disclosures in environmentally sensitive industries in Nigeria. This study is based on secondary data obtained from annual reports of firms listed on the Nigerian Exchange Group (NGX). Data used were collected from 45 sampled companies listed under 6 environmentally sensitive sectors for the 2021 financial year. Content analysis was applied to measure the level of environmental disclosures. The Environmental Disclosure Index (EDI) was prepared based on the Global Reporting Initiative (GRI) Standards. This research used independent sample t-test, analysis of variance, and the Kruskal-Wallis test as techniques of analysis. There were statistically significant differences in firms’ disclosure levels based on environmental certifications. The agriculture industry made the highest environmental disclosure, whereas the companies in the natural resources industry disclosed the least. It was found that companies revealed maximum information on their energy and environmental compliance initiatives, while there was inadequate information in other areas of environmental disclosure, such as neko77 supplier environmental assessment, effluents and wastes, and materials. The study provides implications for the strict adoption of a systematic reporting framework, especially for environmentally sensitive firms, while offering insights to guide policymakers, regulatory bodies, industry associations, and businesses in Nigeria to promote transparency and responsible environmental reporting
The acceptance of biogas in Islamic Boarding School Surakarta
No full textThe rapid population growth in Indonesia is leading to increased energy demands and the depletion of global energy sources. One promising to meet these escalating energy needs in the adoption of renewable energy sources like biogas. This study employs qualitative research methods to measure the response of the Islamic boarding school community in Central Java towards biogas utilization. Data analysis was conducted interactively, narratively describing insights gleaned from questionnaires completed by respondents. The findings reveal a varied response within Central Java Islamic Boarding School Community towards embracing biogas as part of efforts to enhance the national renewable energy mix. However, there is a consensus on certain aspects: respondents generally support biogas utilization as long as it is safe, sourced from clean materials, and developed in suitable locations. The exploration among ten boarding schools suggests that the government’s renewable energy initiatives require further optimization in terms of socialization and engagement with Islamic boarding schools
Bio-cooling façade in tropical climate
No full textThe purpose of this paper is to explore how building design requires consideration of both energy consumption and environmental impacts of the construction and maintenance processes. The increasing energy consumption and construction waste are concerning trends within the building industry. In response to this issues, the concept of circular economy has gained prominence, emphasizing the need to restore, rebuild, and regenerate resources in a sustainable manner. This research focused on Bio-Cooling Façades (BCF) in tropical climates through the assessment of four parameters including the biomaterial, cooling façade, energy consumption, and building circularity. This was conducted through a comparative analysis of existing and eight proposed BCF configurations designed to reduce energy consumption and increase building circularity. The results show that applying BCF at a glazing size of 40% reduces solar heat radiation, lowers building energy consumption, and minimizes potential construction material waste in countries with tropical climates. These findings assist architects and the industry in defining the optimal building façades for cooling, ultimately reducing energy consumption.
A method for estimating the remaining life of power transformers considering loading, hotspot temperature, and oil assessment
No full textPower transformers face significant aging issues, which threatens their reliability and service life. This research aims to develop an accurate method for predicting the remaining lifespan of transformers. Current studies highlight the inadequacy of existing approaches in determining transformer lifespan, which is affecred by the degradation of paper insulation through furan compounds and hotspot temperatures. This method adheres to the CIGRE D1 738 (2018) standard, which converts furan concentration into Degree of Polymerization (DPest) as an indicator of paper insulation condition. The methodology involves analyzing oil test data and operational temperature to estimate the remaining life of the transformer. This research not only aims to improve the accuracy of paper insulation assessments but also integrates sustainability principles. The goal is to optimize the use of existing transformers, reduce premature replacements, and conserve material and energy resources. By minimizing unexpected failures, this research contributes to reducing industrial waste and environmental impact. Furthermore, this approach aligns with practices that support economic and social sustainability. Extending the lifespan of critical devices can lower maintenance costs while ensuring a reliable and sustainable energy supply. The proposed method provides a comprehensive framework for predicting transformers longevity
Adsorption of iron and manganese from acid mine drainage by zalacca (Salacca zalacca) peel- activated carbon
No full textThe low pH and high metal concentration in acid mine drainage cause environmental problems and affect human health. Adsorption not only removes the pollutants but also increases pH levels. Natural adsorbents have gained attention because of their widespread availability, low cost, and effectiveness. Zalacca peel waste is among the biomass materials showing promise as activated carbon for removing contaminants from acid mine drainage. This study aims to investigate the adsorption capacity of activated carbon from zalacca peel for removing iron and manganese from acid mine drainage. Adsorption studies were conducted in batch experiments using various dosages and contact times. Optimal results were achieved with a dosage of 0.8 grams per 100 mL and contact time of 60 minutes, resulting in 80% removal efficiency for iron and 24% for manganese. The neutralization process occurred post-adsorption, bringing the final pH close to neutral levels, suitable for environmentally safe discharge. Experiment data were fitted to the Freundlich isotherm and pseudo-second order kinetics. FTIR analysis revealed functional groups including C-H, C-O, and C=C was found in the adsorbent. Furthermore, surface area and pore volume experienced slight increases following activation with KOH
Spatial dependency of air pollution in Jabodetabek urban agglomerates cities
No full textPoor air quality is a major issue in the core city of the Jabodetabek urban agglomeration, Jakarta. Unfortunately, this problem is not limited to Jakarta. Other cities in Jabodetabek also face similar challenges, where they have experienced similar fluctuations in their annual average PM2.5 concentrations based on historical data. This indicates that the air quality problem is dependend on the region. The integration of systems and activities among these cities may explain this problem. This spatial dependency is dangerous and can lead to transboundary health effects. Therefore, this research aims to find evidence of this spatial dependency in Jabodetabek. The results show that PM2.5 concentration in Jabodetabek is spatially dependent and exhibits a clustered pattern. The highly concentrated core of the cluster is Depok, the connecting city between the buffer cities and the core city of Jabodetabek. Cities with high-point and mobile hotspot sources, such as South Jakarta, East Jakarta, Bogor, and Bogor City, surround Depok, leading to this concentration
Investigation of direct Coagulation-Flocculation-Ultrafiltration (CFU) at lab-scale constant pressure and flux operation of copper removal
No full textLimited heavy metal concentrations in drinking water are harmful. The size-exclusion separation process was found to be a technology for removing heavy metals and organic substances. Although promising, a single ultrafiltration process is insufficient for the separation of heavy metals. Therefore, an additional process is required. The combination of coagulation flocculation followed by ultrafiltration was investigated. In this study, water matrix was used to simulate the worst-case scenario by adding 2 mg of copper to the surface water. For the filtration process, a comparison of single ultrafiltration with and without pretreatment using aluminum sulfate was investigated. Filtration was performed in a lab-scale experiment employing a polyethersulfone (PES) membrane with an average pore size of 30 nm operated at constant flux 120 L/m²⋅h and constant pressure of 0.7 bar. Furthermore, TDS retention, copper concentration, and turbidity were observed. Higher Cu removal was found at filtration under constant flux compared to constant pressure (81% and 66%, respectively. In the case of treated water with coagulation (optimum coagulation of 30 mg/L), higher removal of Cu was observed at constant flux operation compared to constant pressure, with 73% and 89% removal, respectively. Additional coagulation resulted in less membrane fouling during the filtration experiment, which explained the better performance almost double that of single ultrafiltration
The multifaceted implications and challenges of relocating Indonesia\u27s capital city: A comprehensive review of socio-economic, environmental, urban planning, and policy considerations
No full textIndonesia\u27s planned relocation of its capital city from Jakarta to Nusantara in East Kalimantan represents a multifaceted and ambitious undertaking with far-reaching implications. This study conducts a comprehensive review of the socio-economic, environmental, urban planning, and policy considerations associated with this project. Through a thematic analysis of 19 relevant studies published between 2015 and 2023, the research explores the potential benefits and challenges of the relocation. The findings highlight several potential benefits, such as a more equitable distribution of national welfare, economic growth, and environmental improvement driven by the development of a forest city concept. However, the study also raisee concerns about possible negative impacts on the real estate industry in Greater Jakarta, environmental consequences such as deforestation and biodiversity loss, and the need for social and cultural adaptation among both migrating government officials and local communities. The study emphasizes the importance of adopting sustainable development practices, inclusive development strategies, and effective governance frameworks to ensure a successful and sustainable transition to the new capital city. Additionally, it identifies research gaps, particularly regarding the long-term impacts on various sectors and the effectiveness of proposed mitigation strategies. This review serves as a valuable resource for policymakers, researchers, and stakeholders involved in the IKN relocation project. It provides critical insights into the potential opportunities and challenges, emphasizing the necessity of careful planning, stakeholder engagement, and transparent implementation to achieve long-term sustainability, social equity, and equitable development
A comparative study of ferrous and persulfate catalysts for the H2O2/UV oxidation of batik wastewater
No full textThe increasing number of batik industries in Indonesia may lead to water pollution due to wastewater containing high levels of organic pollutants. This study evaluated advanced oxidation processes (AOPs) utilising H2O2/UV to decolourise and remove organic contaminants (measured as chemical oxygen demand, COD) from batik wastewater. The study aims to compare the effectiveness of adding ferrous and persulfate as catalysts as catalyst in the H2O2/UV process, specifically evaluating the H2O2/Fe2+/UV and H2O2/S2O82-/UV processes. The results indicated that all treatment methods effectively decolourised and degraded COD in the batik wastewater. COD and colour removal achieved up to 96.51% and 78.70% for H2O2/UV, 97.20% and 83.53% for H2O2/Fe2+/UV, and 97.20% and 83.53% for H2O2/ S2O82-/UV, processes, respectively. Additionally, the use of persulfate as a catalyst accelerated the oxidation processes, reaching completion in 45 minutes compared to 60 minutes with the other catalyst.