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Journal of Clean Technology
Published by Universitas Negeri Semarang
ISSN : 24608874     EISSN : 24609811     DOI : -
Core Subject : Engineering,
Engineering
The Journal of Clean Technology (JoCT) is a leading peer-reviewed publication dedicated to advancing research and innovation in the field of clean technology. JoCT provides a platform for scientists, engineers, policymakers, and industry professionals to disseminate cutting-edge research, exchange ideas, and promote sustainable solutions to global environmental challenges. JoCT has a printed and online standard serial number which is p-ISSN 2460-8874 (printed version) and e-ISSN 2460-9811 (electronic version).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 1 No. 2 (2024): August 2024" : 5 Documents clear
Comparison of the Effectiveness of Electrical Energy Production from Livestock Manure by Optimization using Combined Heat and Power (CHP) Method: A Literature Review Ilham, Wahyu Ilham Kholiq; Arwan Suryadi Pramanta; Jalaludin Rumi; Ahmad Dzaky Harahap
Journal of Clean Technology Vol. 1 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i2.9678

Abstract

Livestock manure is a potential source of renewable energy. This study compares the effectiveness of electrical energy production from livestock manure with and without optimization using the Combined Heat and Power (CHP) method. Using the CHP method can improve energy efficiency by utilizing the heat generated from burning livestock manure to produce electricity and heat. The literature shows that CHP can significantly improve energy efficiency. The energy efficiency of CHP systems can reach 80%, compared to 30-40% for conventional systems. In addition, CHP can produce lower greenhouse gas emissions compared to traditional systems. The study also shows that CHP can be an economical solution to generate electrical energy from livestock manure. CHP systems can generate significant economic benefits in the long run.
Bioethanol Production from Corn Cob Trough Utilization of Agrobiomass Waste in East Java as Renewable Energy : a Review Grezdipa Pratama, Harsya; Sari Kusuma Wijayanti, Widya; Devi Larasati, Annisa; Rekyan Permatasari, Olivia
Journal of Clean Technology Vol. 1 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i2.10485

Abstract

The demand for energy from fossil fuels continues to surge along with the rapid development of industry and the economy. Efforts to reduce dependence on fossil energy, especially the limited petroleum, are crucial. Therefore, it is necessary to increase the utilization of other energy sources, especially bioethanol, which is renewable and environmentally friendly. The production of bioethanol is intensifying due to market stability, low costs, sustainability, its role as an alternative fuel, and the risk of fossil fuel depletion. Corn cob waste comprises various organic compounds, including 40-60% cellulose, 20-30% hemicellulose, and 15-30% lignin. These compounds can be transformed into various forms of bioenergy, including bioethanol, biogas, and bio-oil. The process of producing bioethanol from corn cobs involves pretreatment, hydrolysis, fermentation, and distillation. The production of bioethanol from corn cob waste consists of several stages: pretreatment, hydrolysis, fermentation, and distillation. Lignin impedes acid penetration before hydrolysis and inhibits microbial growth during fermentation, so it must be removed through alkaline pretreatment. Glucose production from alkali-treated corn cobs can be achieved through hydrolysis using chemical or enzymatic catalysts. Acid hydrolysis with 21% H2SO4 and 21% HCl is preferred due to its shorter operating time. On the other hand, the high cost of enzymes and the extended operating time diminish production efficiency. The acid hydrolysis method using 21% H2SO4 requires 1 hour, 2 hours, and 3 hours and uses 21% HCl at a temperature of 100°C with a yield of less than 10%. The production of bioethanol from corn cobs is carried out using the SHF and SSF methods. The SSF method yields a range of 1.94%-88.37%. The SHF method yields a range of 0.28%-0.57%. Distillation is employed to remove impurities from liquids contaminated by dissolved substances from corn cobs, which have varying boiling points. Vacuum distillation can achieve a purity level of 89%. Converting corn cob into bioethanol aids in reducing environmental pollution and promotes the use of clean energy.
Bioethanol Production as Renewable Energy from Macroalgae Eucheuma cottonii: A Mini Review Rasyid, Rahimsyah Ijas Nur; Muhammad Fadhlan Dzikri; Hayya Laudza Adani; Evelyna Anindya Davina
Journal of Clean Technology Vol. 1 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i2.10770

Abstract

Energy demand has increased from several years ago due to economic growth and population increase. Meanwhile, non-renewable energy reserves from fossil fuels are dwindling. Bioethanol is one alternative energy resource to substitute fossil fuels and their derivatives. The fast expansion and environmental friendliness of Eucheuma cottonii macroalgae's growth make it a promising contender for use as a sustainable renewable energy source. Because of its abundant carbohydrate content, it can be utilized in generating bioethanol. This analysis delves into the potential of macroalgae in bioethanol production by concentrating on hydrolysis and fermentation. The Eucheuma cottonii process involved hydrolyzing it into reducing sugars using an optimal dilute acid hydrolysis pretreatment. This hydrolysate is converted into bioethanol by Saccharomyces cerevisiae through fermentation. Process the bioethanol obtained is distilled to reach the maximum concentration. The process of producing bioethanol, which is a renewable energy source, is expected to have an important impact on dealing with the energy crisis and advancing environmental sustainability.
Study of Nitrification Process in a Media Raised Bed Based Aquaponic System Prasetiawan, Haniif; Aulia Mukadis; Afrissa Viola Motti; Nurhayati; budi setiawan
Journal of Clean Technology Vol. 1 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i2.12323

Abstract

Aquaponics is an integrated and sustainable farming method that combines aquaculture and hydroponics in a recirculating water system. This system utilizes fish waste as a nutrient source for plants, and the plants act as biofilters to clean the water before it returns to the fish tank. A critical process in this system is nitrification, where ammonia is converted into nitrite and nitrate by beneficial bacteria, reducing toxicity to fish and providing nutrients for plants. This study investigates the efficiency of the nitrification process using four different biofilter media—rockwool, pumice stone, gravel, and zeolite—in a media-raised bed aquaponic system. Results showed that pumice stone provided the highest nitrate concentration (131.62 mg/L), indicating superior nitrification performance. The findings offer valuable insights for optimizing biofilter media selection in aquaponic systems, which is crucial not only for maintaining water quality but also for enhancing crop productivity. The study contributes to the development of more efficient and sustainable aquaponic designs, particularly in regions facing water scarcity and the need for integrated food production solutions.
Zero Waste Education Organic Waste Treatment for Students of SD N Petompon 3 Irene Nindita Pradnya; Maulida Zakia; Zuhriyan Ash Shiddieqy Bahlawan; Kakalia Putri Auralita; Achmad Wikandaru; Daffa Nur Muhammad
Journal of Clean Technology Vol. 1 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i2.13016

Abstract

Improper waste management at SDN Petompon 3 Semarang has led to inadequate sanitation and a lack of environmental awareness among students. This community service initiative aimed to address these issues by educating 5th and 6th-grade students on organic waste processing through the utilization of Black Soldier Fly (BSF) larvae. The program introduced a hands-on approach where students learned to sort, manage, and convert organic waste into value-added products such as animal feed and organic fertilizer. Additionally, the program incorporated entrepreneurship training, equipping students with basic skills in packaging, branding, and marketing to promote sustainable small-scale enterprises. The activities included stakeholder coordination, infrastructure preparation, environmental education, and product processing workshops. Results showed improved student participation, increased environmental knowledge, and measurable growth in maggot biomass and waste decomposition rates over 30 days. This integrated program not only enhanced environmental cleanliness at the school but also fostered early environmental stewardship and entrepreneurial skills among students, contributing to sustainable waste management and community empowerment.

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