Jurnal Riset Teknologi Pencegahan Pencemaran Industri

Isotherm Study, Adsorption Kinetics and Thermodynamics of Lead Using Combination Adsorbent of Chitosan and Coffee Ground Activated Carbon

Nisa Nurhidayanti Nisa, Aris Dwi Cahyanto — Fri, 22 Dec 2023 00:00:00 +0000

The presence of lead metal in water naturally due to its mobility can cause the nature of water to become toxic and endanger the environmental ecosystem because it bioaccumulates in the food chain. The purpose of this study was to study the maximum adsorption capacity through an isotherm model, to determine the rate of adsorption kinetics in the use of chitosan and coffee grounds adsorbents in reducing lead concentrations in industrial wastewater and to study its thermodynamic magnitude. The research method was carried out using experiments in the laboratory followed by quantitative data analysis to determine the isotherm model and adsorption kinetics. The results showed that the adsorption isotherm follows the Langmuir isotherm model with a correlation coefficient of 0.9970 with a maximum adsorption capacity of 1.0511 mg.g-1 which indicates that chemical adsorption occurs in the mono layer with a homogeneous distribution of adsorption sites with adsorption energy. constant and negligible interactions between lead metal molecules (adsorbate). Study of lead adsorption kinetics using chitosan-activated carbon coffee grounds following the Weber-Morris/intra-particle diffusion model with a correlation coefficient of 0.9920 with a diffusion rate of 76.512 g.mg-1.hour-1 indicating that intra-particle diffusion is the rate step limiting in the overall biosorption process. Negative ΔG^o values indicate that the adsorption reaction takes place spontaneously, ΔH^o of 0.8130 indicates an endothermic reaction, and ΔS^o of 4.1888 indicates an increase in the randomness of the adsorption process at the adsorbent interface and lead during adsorption.

The Processing of LDPE Plastic Waste into Renewable Fuel Using Waste Motor Oil

Alex Surapati, Angky Puspawan, Yanolanda Suzantry Handayani, Fitrilina — Fri, 22 Dec 2023 00:00:00 +0000

The increase in population causes an increasing amount of solid waste, especially plastic waste. Plastic waste that cannot be decomposed in nature increases its number and causes environmental pollution. The research aimed to process plastic waste into alternative fuel oil using waste motor oil. The research methods consisted of designing a plastic waste processing device using waste motor oil as fuel and testing the device with a plastic burning process using a processing machine. The plastic waste processing device was produced in the form of a stove that functions to heat plastic waste fueled by waste motor oil using an electric blower to generate pressure into the reactor. The heating process produces steam flowing and processing in a distillation tube to produce oil. The resulting temperature was 140oC and could melt plastic waste, but there were still burning residues. The distillation produced two types of fuel oil, yellow and black.

Global Context of Industry 5.0 : Current Trends and Challenges in Indonesia

Rame Rame, Purwanto Purwanto, Sudarno Sudarno — Fri, 22 Dec 2023 00:00:00 +0000

Industry 5.0, the latest advancement in production processes, emphasizes a collaborative and human-centered approach to manufacturing. This paradigm shift incorporates 3D printing, Augmented Reality (AR), Virtual Reality (VR), the Internet of Things (IoT), and Artificial Intelligence (AI) to potentially enhance environmental sustainability, process technology, and energy conservation. Although Industry 5.0 offers significant opportunities, its implementation in Indonesia faces several challenges, such as infrastructure development, human resource competency enhancement, and the establishment of supportive laws and regulations. Collaboration among government, industry, and academic institutions drives innovation and research. This review article examines the current state of Industry 5.0, the underlying technology, and the obstacles and opportunities in adopting this novel manufacturing approach. It highlights environmental impact, process technology, and energy conservation as critical areas for consideration. Indonesia can substantially improve these areas by leveraging the potential of Industry 5.0 and overcoming these challenges. The paper offers insights into Indonesia's integration of Industry 5.0 and explores the benefits this new paradigm can bring to the nation.

Synthesis of Silica Nanoparticle Made from Lampung Pumice Modified with Sonication Parameters for Size and Purity

Siti Rahmadianti, Yusup Hendronursito — Fri, 22 Dec 2023 00:00:00 +0000

This study aims to determine the effect of sonication process parameters on the formation of the size and purity of silica from the synthesis of pumice. Pumice reflux process using NaOH for 24 hrs. Titrate using 5M H₂SO₄ solution to pH 7 and a white gel is formed. The residue was washed using distilled water and dried at 100 ^oC for 24 hrs. The residue was then stirred with 1M HCl solution for 4 hrs. After the synthesis process, the silica powder was then subjected to a sonication process with temperature variations of 30, 60, and 80 ^oC for 1, 2, and 3 hrs. The purity of silica was evaluated from the results of x-ray fluorescence, x-ray defragment, and SEM test results. The results of the analysis of variance showed that the independent variable temperature contributed 67.25% and had a significant effect on the SiO₂ concentration. The two sonication variables, temperature and time, contributed 50.31% and 46.24%, respectively. The variables significant effect on particle size. Other independent variables affect the SiO₂ concentration by 10.36%. The sonication process can increassed concentration and reduced particle size of silica synthesized by selecting the appropriate independent variable.

Tempeh Industry Wastewater Treatment using Mix Natural Adsorbents (Zeolite, Bentonite, Water Hyacinth-Activated Carbon): Effect of Mass Ratio and Dosage of Mix Adsorbents on Turbidity and pH

Lia Cundari, Muhammad Radhiy Sukandar, Fahmi Nurusman — Fri, 22 Dec 2023 00:00:00 +0000

Adsorption is the process of agglomeration of dissolved substances in solution by the surface of an absorbent substance which makes the material enter and collect in an absorbent substance. Natural adsorbents that function to treat tempe liquid waste are zeolite, bentonite, and water hyacinth activated carbon. The purpose of this study was to determine the effect of the mass ratio and dose of natural adsorbents on the turbidity and pH values of tempe wastewater. The mass ratio variation used was the ratio of each material in the form of zeolite: bentonite: active carbon of water hyacinth in the form of R1 (1:1:1); R2 (2:1:1); R3 (1:2:1); and R4 (1:1:2). The adsorbent dose carried out was 1.5 gr; 3 grams; and 4.5 gr per 100 ml volume of liquid waste. The contact time between the adsorbent and the liquid waste is every 15, 30, 60, 90, 120, 150 minutes. Processing of tempe liquid waste was carried out in laboratory-scale batches with 120 rpm stirring. The analysis was carried out in form of turbidity, pH, COD, BOD, and TSS. The results showed that the adsorption was able to reduce turbidity and increase the pH level up to 99% by stirring the mass ratio R2 (2:1:1) for 150 minutes with a dose of 4.5 grams. It was found that the turbidity value decreased from 520.5 NTU to 2.47 NTU =ncrease in pH levels reaching 75% at 150 minutes of stirring at a dose of 4.5 grams. Decreased pH value from 3.7 to 6.4. The maximum adsorption capacity validation results were obtained based on the Frendulinch analysis of 7.07-49.75 mg/g with a Freundlich constant of 0.67-0.70 at a dose of 4.5 grams.

Transforming The Furniture Industry in The Digital Age

Rame Rame, Purwanto Purwanto, Sudarno Sudarno — Fri, 22 Dec 2023 00:00:00 +0000

The furniture industry is experiencing a significant transition driven by digital technologies. This article comprehensively reviews various technologies, techniques, and innovations that the furniture industry has adopted to enhance efficiency, sustainability, and competitiveness. The analysis draws on a systematic literature review of recent publications in ScienceDirect and Scopus databases. The study highlights the potential of automation, robots, augmented reality, and the Internet of Things to improve the furniture production process, reduce waste, and boost profitability. Additionally, the article examines technologies and approaches that can help the furniture industry become more sustainable and socially responsible, such as green supply chain management, life cycle assessment, and ergonomic treatments. The paper concludes by advocating for a comprehensive digital transformation strategy that includes embracing new technologies, developing innovative business models, and promoting sustainability and ethical standards.