Wyniki wyszukiwania - Biblioteka Nauki

1

Utilization of Black Liquor as Urease Inhibitor for Ammonia Reduction

100%

Sarwono A. , Widiantara M. D. , Zahra N. L. , Floresyona D. , Suryawan I. W. K. , Siagian F. M. H. , Septiariva I. Y.

Ecological Engineering & Environmental Technology

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2022

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tom Vol. 23, iss. 2

213--218

EN

Urea fertilizers in agricultural operations usually tend to produce large amounts of ammonia due to hydrolysis, therefore contribute to the air pollution. The purpose of this study was to study the potential black liquor from pulp industry as urease inhibitor. Characterization of the black liquor was carried out by Spectrophotometer Fourier Transform Infra-Red (FTIR) and Thermal Gravimetric Analyzer (TGA) instruments. Meanwhile, the determination of ammonia levels was carried out using UV-spectrophotometer. The black liquor used in this process contains OH stretching, C=O stretching, an aromatic ring vibration, ring vibration, and guaiacil ring vibration indicating the presence of lignin. TGA primary weight loss in black liquor occurs above 200 °C. The addition of urease enzymes to urea tends to increase the release of ammonia. Meanwhile, the results showed that black liquor could prevent the nitrogen loss of urea.

2

Pelletizing of Various Municipal Solid Waste: Effect of Hardness and Density into Caloric Value

100%

Suryawan I. W. K. , Fauziah E. N. , Septiariva I. Y. , Ramadan B. S. , Sari M. M. , Ummatin K. K. , Lim J.-W.

Ecological Engineering & Environmental Technology

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2022

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tom Vol. 23, iss. 2

122--128

EN

Density and hardness are physical parameters in the manufacturing of refuse derived fuel (RDF) pellets. In making pellets, a high heating value for the combustion system is desired. This research aimed to analyze the mixture of municipal solid waste to its density and hardness and study its correlation to heating value. The variable used in this research is a mixture of paper waste and garden waste and food scraps and garden waste. The density and hardness for the mix of paper waste and garden waste were 1970.6 to 2474.8 kg/m3 and 37.8–42.8 HA, respectively. The mixture of food waste and garden waste has density and hardness of 1822 to 2276.7 kg/m3 and 17.4–37.8 HA. The correlation between density and hardness on heating values did not reach a significance of 0.05, so there was no strong relationship between density and hardness on heating values.

3

The Effect of the COVID-19 Pandemic on Waste Management in the Eastern Tourism Regions of Java and Bali Islands

100%

Septiariva I. Y. , Sari M. M. , Istanabi T. , Suhardono S. , Prayogo W. , Suryawan I. W. K.

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tom Vol. 24, iss. 3

1--9

EN

The tourism sector is one of the sectors that has been negatively affected by the COVID-19 pandemic. Increased waste generation is a significant problem that tourist areas must face during the COVID-19 pandemic. Therefore, to reduce the impact, research was carried out on waste management before and during the pandemic in regional tourism areas, especially in the eastern part of Java and Bali. This study aims to analyze the changes and composition of waste and during the COVID-19 pandemic in tourist areas in the Eastern Tourism Areas of Java and Bali. Collecting, processing data, and statistical analysis carry out the research method. Based on the study results, the waste generation generated in eight eastern regencies of Java and Bali experienced a change between -5.67% to 1.82%. Plastic waste increased by 27.61% during the pandemic, while mask waste increased by 1.23% in one area. Waste management also changed from -0.011% to 1.821%. The analysis results using ANOVA showed that the COVID-19 pandemic significantly affected the amount of waste generated by the eight tourist areas, with the main contribution caused by an increase in mask waste.

4

Life Cycle Environmental Implications of Wastewater Treatment at an Academic Institution

100%

Septiariva I. Y. , Suhardono S. , Indawati L. , Suryawan I. W. K. , Wahyudi A. H. , Solichin S.

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tom Vol. 25, nr 5

389--403

EN

This study performs a life cycle assessment (LCA) on the wastewater treatment operations at Sebelas Maret University in Surakarta, Indonesia, with the goal of systematically evaluating the environmental impacts associated with its processes. LCA serves as a comprehensive method for assessing environmental impacts across all stages of a product’s life cycle, which includes goal and scope definition, life cycle inventory (LCI), life cycle impact assessment (LCIA), and interpretation. Utilizing this methodology, our analysis categorizes environmental impacts into three significant domains: human health, ecosystem quality, and resource depletion. The findings indicate that human health is the most impacted category, showing an effect of 0.275 disability-adjusted life years (DALY) -equivalent units. Resource depletion follows, measured at 0.193 DALY-equivalent units, and non-renewable energy consumption is quantified at 0.0214 DALY-equivalent units. To address these impacts, the study proposes several improvement strategies, such as adopting more sustainable clean water treatment technologies, capturing and utilizing methane gas through anaerobic digestion, and establishing green spaces for CO2 sequestration. These strategies aim to reduce the environmental footprint of the wastewater treatment process, moving towards more sustainable management practices.

5

Transforming Bubble Wrap and Packaging Plastic Waste into Valuable Fuel Resources

100%

Sari M. M. , Inoue T. , Rofiah R. , Septiariva I. Y. , Prayogo W. , Suryawan I. W. K. , Arifianingsih N. N.

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2023

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tom Vol. 24, nr 8

260--270

EN

This study aimed to investigate the potential of plastic waste, specifically bubble wrap and packaging plastic, as a fuel source through pyrolysis process. The samples were analyzed using FTIR and GC-MS. The results showed that both samples contained alkanes and alkenes, with hydrocarbon fractions like those found in gasoline, kerosene, and diesel fuel. The pyrolysis process resulted in hydrocarbon fractions ranging from light to heavy fractions. The bubble wrap sample showed the highest percentage of hydrocarbon fraction in the kerosene range (C10–C13), with an area of 19.23%. In contrast, the packaging plastic sample showed the highest percentage of hydrocarbon fraction in the diesel range (C14–C20), with an area percentage of 19.67%. The calorific value of the pyrolysis products was also determined, with the bubble wrap sample having a higher value than that of gasoline, while the packaging plastic sample had a value close to that of kerosene. The results of this study suggest that plastic waste has the potential to be converted into fuel, which can contribute to sustainable development by reducing dependence on fossil fuels and reducing plastic waste. However, further refinement of the pyrolysis products is needed to meet commercial fuel standards.

6

Comparison of Solid Waste Generation During and Before Pandemic Covid-19 in Indonesia Border Island (Riau Islands Province, Indonesia)

100%

Sari M. M. , Septiariva I. Y. , Istanabi T. , Suhardono S. , Sianipar I. M. J. , Tehupeiory A. , Suryawan I. W. K.

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2023

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tom Vol. 24, iss. 2

251--260

EN

Waste in the archipelagic border area must be appropriately managed to maintain diplomatic relations. Indonesia’s Riau Islands Province is an archipelagic region in Indonesia with limited solid waste infrastructure development. The capacity of the waste infrastructure depends on the rate of waste generation and is influenced by the socioeconomic conditions of the community. This study aims to study the model for estimating the rate of waste generation in the Riau Islands. This study uses data before and during the Covid-19 pandemic in 2019 and 2020. The estimation model uses a multiple linear regression model with independent variables such as gross regional domestic product, access sanitation, total population, and human development index. The fixed variable is the incidence of waste generation rate. During the pandemic Covid-19, the generation and composition of waste in the Riau Islands Archipelago did not experience significant changes, so the waste generation and composition characteristics are the same. However, the variable human development index (0.053) and the population (0.012) significantly increase the waste generation rate. The gross regional domestic product (0.017) negatively correlates, reducing the waste generation rate. The Riau Islands, which has an ocean area of 96%, is a source of life and significant to manage because the waste can be released into the ocean. Therefore, management from sources through policies considering the gross regional domestic product, total population, and human development index needs to be considered to reduce waste generation in the archipelago.

7

Assessing the Ecological Function Effectiveness of Urban Parks in Surakarta City, Indonesia

100%

Suhardono S. , Safitri F. E. , Rachmalia F. , Rizky F. A. , Khairunnisa D. H. , Septiariva I. Y. , Suryawan I. W. K.

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2024

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tom Vol. 25, iss. 4

227--240

EN

Urban parks are vital for ecological sustainability within city landscapes, offering services that range from biodiversity preservation to climate regulation. This study evaluates the ecological function effectiveness of urban parks in Surakarta City, providing a quantifiable assessment of their contribution to environmental health and urban biodiversity. Through a systematic analysis of various parks within the Jebres sub-district, ecological function indicators such as green open space ratios, oxygen production, microclimate regulation, air pollution absorption, and biodiversity were measured. The findings indicate that Lansia Park holds the highest effectiveness rate at 78.80%, signifying its exemplary management and ecological value. Contrarily, Gendon ISI Park and Tegalharjo Park presented lower effectiveness rates of 70.40% and 71.00%, respectively, suggesting areas for potential improvement. The average ecological function effectiveness rate across all studied parks stands at 74.03%, reflecting the overall positive impact of Surakarta’s green spaces on urban ecology. This research underscores the imperative role of urban parks in enhancing ecosystem services and provides a framework for future urban planning and conservation strategies, emphasizing the enhancement of carbon sequestration capabilities within urban green spaces.

8

Utilizing Pyrolysis of Plastic Debris for Refuse-Derived Fuel Production and Viable Substitute to Wood Debris

67%

Mutiara Sari M. , Inoue T. , Harryes R. K. , Septiariva I. Y. , Yokota K. , Notodarmodjo S. , Kato S. , Al Ghifari R. M. , Suhardono S. , Suryawan I. W. K. , Prayogo W. , Arifianingsih N. N.

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tom Vol. 24, iss. 8

133--142

EN

This research explores the viability of converting discarded Polyethylene Terephthalate (PET) plastic waste into a valuable resource through the implementation of pyrolysis and refuse-derived fuel (RDF) technologies. The objective is to assess the potential of PET charcoal waste as an efficient source for RDF generation, surpassing the energy recovery and recycling potential of PET waste. The study introduces three RDF variants: RDF PET100, RDF PET50, and RDF PET0. RDF PET100 is comprised entirely of PET charcoal, RDF PET50 combines 50% PET charcoal with 50% wood debris, and RDF PET0 consists entirely of wood debris. Comprehensive assessments of water content, ash content, and calorific value were conducted to evaluate the quality of these RDF formulations. Results indicate that RDF PET100 exhibits a water content of 2.63%, ash content of 0.73%, and calorific value of 5,976 MJ/kg. Similarly, RDF PET50 showcases a water content of 3.6%, ash content of 1.05%, and calorific value of 5,587 MJ/kg. RDF PET0 presents a water content of 7.51%, ash content of 1.36%, and calorific value of 4,198 MJ/kg. The outcomes underline the potential of PET plastic waste repurposing through RDF and pyrolysis techniques. Particularly, RDF PET100 emerges as a high-caliber fuel option characterized by its minimal water and ash content, coupled with a substantial calorific value. This innovation holds promise in mitigating plastic waste challenges, particularly pertinent in the context of Indonesia.