https://tecnoscientifica.com/journal/sein/issue/feed 2025-09-30T00:00:00+00:00 Sustainable Environmental Insight sein@tecnoscientifica.com Open Journal Systems <p>Welcome to "Sustainable Environmental Insight," a leading scholarly journal dedicated to advancing knowledge and understanding in the field of environmental sustainability. Our journal provides a platform for researchers, scientists, and practitioners to share valuable insights and explore innovative approaches toward sustainable environmental solutions. We invite high-quality contributions focusing on various interdisciplinary aspects, including environmental chemistry, pollution prevention, renewable energy, ecosystem conservation, waste management, and climate change mitigation. By fostering collaboration and disseminating cutting-edge research, our goal is to drive positive change and contribute to a more sustainable future for our planet. Join us in this endeavor to gain profound insights into sustainable environmental practices.</p> https://tecnoscientifica.com/journal/sein/article/view/636 2025-08-12T01:15:06+00:00 Muhammad Hakim Abd Razak mhakimbdrazak@gmail.com Najeeha Mohd Apandi najeha@uthm.edu.my Mohd Syafiq Syazwan Mustafa mohdsyafiq@uthm.edu.my Noor Kamalia Abd Hamed kamalia@uthm.edu.my Muhammad Rafi Azmi muhrafizmi@gmail.com

<p>The construction industry's dependence on Portland cement considerably increased global carbon emissions, which highlighted the need for environmentally friendly alternatives. This research explored the application of rice husk ash (RHA) and palm oil fuel ash (POFA), two common agricultural byproducts in Malaysia, as partial cement replacements in concrete. The study examined the mechanical performance and durability of several POFA–RHA concrete mix designs with the goal of reducing environmental impact while maintaining structural integrity. A systematic approach was applied for material characterization, which included advanced methods such as Field Emission Scanning Electron Microscopy (FESEM). The workability, compressive strength, and water absorption of concrete samples with varying POFA and RHA proportions were assessed. The findings showed that a mixture containing 25% POFA and 5% RHA achieved notable improvements in strength and durability while reducing water absorption. In contrast, higher replacement levels reduced workability and performance due to increased water demand and particle aggregation. Overall, the combination of 25% POFA and 5% RHA delivered substantial enhancements in strength, durability, and water absorption.</p>

2025-08-25T00:00:00+00:00 Copyright (c) 2025 Muhammad Hakim Abd Razak, Najeeha Mohd Apandi, Mohd Syafiq Syazwan Mustafa, Noor Kamalia Abd Hamed, Muhammad Rafi Azmi https://tecnoscientifica.com/journal/sein/article/view/730 2025-07-08T12:57:42+00:00 Josfirin Uding Rangga josfirinudingrangga@gmail.com Sharifah Norkhadijah Syed Ismail norkhadijah@upm.edu.my Karmegam Karuppiah megam@upm.edu.my Irniza Rasdi irniza@upm.edu.my

<p>Estimation of heavy metal concentrations in leachate was crucial for effective landfill management and pollution mitigation. The study aimed to estimate the volume of landfill leachate, the heavy metal content in the leachate, and their reduction through waste segregation practices. It was conducted in Malaysia and utilised municipal solid waste volume data from six states and two federal territories. A mathematical empirical model was applied to estimate the concentrations of heavy metals in the leachate. Based on the volume of landfilled waste, an estimated 565,000 cubic metres (m³) of leachate were discharged annually. Among the heavy metals analysed, Pb and Zn exhibited the highest concentrations (8.49 kg/yr). Waste segregation practices reduced heavy metal discharge in leachate, preventing approximately 7.09 × 10⁻⁴ to 5.32 × 10⁻³ kg/yr. Through mathematical modelling, this research provided a cost-effective approach for estimating heavy metal concentrations and supported strategies for addressing environmental and health impacts.</p>

2025-08-25T00:00:00+00:00 Copyright (c) 2025 Josfirin Uding Rangga, Sharifah Norkhadijah Syed Ismail , Karmegam Karuppiah, Irniza Rasdi