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The UNS Community Service Program (KKN) Batch 68 was conducted from July to August 2025 in Jaten Village, Karanganyar Regency, Central Java. This program focused on educating the community about the utilization of organic waste, particularly dragon fruit (Hylocereus spp.) peel, which is generally underutilized. Dragon fruit peel has the potential to be developed into functional food products as it contains fiber, vitamins, and pectin. Through the “Dragon Fruit Peel Waste Management into Sauce” workshop, participants were provided with knowledge and skills to process organic waste into value-added products while supporting household food security. The implementation methods included counseling, demonstrations, and hands-on practice. The results showed an increase in community understanding of food waste management, improved skills in processing dragon fruit peel into sauce, and the establishment of communication networks among village cadres for program sustainability. This innovation also holds potential to be developed into micro-enterprises in the healthy food sector.

Karang Taruna is a youth organization that plays a strategic role in developing the social and economic capacity of rural communities. However, local potential is often underutilized due to limited entrepreneurial knowledge, managerial skills, and access to mentoring. This community service program aimed to assist the Karang Taruna of Kedungturi Village, Taman Subdistrict, Sidoarjo, in fostering an entrepreneurial spirit based on the village’s local resources. The implementation method applied a participatory approach that directly involved youth through several stages: village potential mapping, entrepreneurship training, business mentoring, and facilitation of digital marketing access. The mentoring process provided not only theoretical knowledge but also practical experience in developing business ideas that correspond to local resource characteristics.The results of the program indicated an increased understanding among Karang Taruna members regarding entrepreneurship concepts, business management strategies, and the use of digital technology. Furthermore, the program successfully initiated three new business ventures based on local potential, namely traditional culinary products, waste-based handicrafts, and digital services. The establishment of a youth entrepreneurship team under Karang Taruna further strengthened collective commitment to developing the village’s creative economy. The impacts were not limited to improved skills but also included the growing awareness of the importance of local resource–based economic independence.In conclusion, this program demonstrates that participatory mentoring through Karang Taruna can serve as an effective strategy to strengthen the entrepreneurial spirit of rural youth while promoting local economic independence and sustainability.

Acid mine drainage (AMD) is one of the major environmental problems arising from coal mining activities. AMD is formed through the oxidation of sulfide minerals, resulting in acidic water with high concentrations of dissolved heavy metals. This condition is characterized by elevated levels of Fe, Mn, and total suspended solids (TSS), which, if left untreated, can pollute nearby water bodies, damage aquatic ecosystems, and pose risks to human health. Therefore, effective, eco-friendly, and low-cost treatment methods are needed to minimize the negative impacts of AMD. This study aims to investigate the effect of activated carbon derived from sugarcane bagasse as an adsorbent for reducing Fe, Mn, and TSS levels in AMD at the sump of PT Alreksa Bara Mitra. The selection of sugarcane bagasse is based on its abundance as an agro-industrial waste and its high lignocellulosic content, making it a potential raw material for activated carbon. The research involved the preparation of activated carbon through carbonization and activation processes, followed by its application to AMD samples with variations in adsorbent dosage and contact time. Laboratory analyses were conducted to measure the concentrations of Fe, Mn, and TSS before and after treatment. The results showed that sugarcane bagasse-based activated carbon significantly reduced Fe, Mn, and TSS concentrations. The highest removal efficiencies were achieved under optimum conditions, reaching 93.14% for Fe, 95.05% for Mn, and 85.04% for TSS. These findings demonstrate that activated carbon from sugarcane bagasse has a strong adsorption capacity for dissolved metals and suspended solids in AMD. In conclusion, sugarcane bagasse-derived activated carbon has potential as an environmentally friendly and cost-effective alternative for AMD treatment, while simultaneously providing added value to agro-industrial waste. This research is expected to serve as a reference for the development of more sustainable mine wastewater treatment methods.

Ineffective management of household waste in rural areas, such as Aek Korsik Village, Aek Ledong District, Asahan Regency, causes air pollution due to traditional waste burning practices. This research aims to design and implement an environmentally friendly low-smoke waste incinerator as an alternative solution based on simple technology and local resources. The research methods used are technological engineering approaches and field studies, including tool design, trials, and environmental and social impact evaluation. The furnace is designed using heat-resistant local materials and mild steel, features a dual ventilation system and a smoke exhaust system with a simple filter, and has a combustion capacity of 5 kilograms per cycle. Preliminary studies show that the composition of waste is dominated by organic matter (60%), plastic and paper (30%), as well as the rest are inorganic. Testing over several weeks showed that an average burn time of 1.5 hours was able to reduce smoke emissions by up to 60% compared to conventional methods. The air quality around the test site has improved significantly, and the community has responded positively to the ease of use and environmental benefits of the furnace. This study concludes that low-smoke combustion furnaces are effective as environmentally friendly waste management solutions in villages, with recommendations for increasing combustion capacity and integrating other waste management methods to support sustainability and environmental preservation.

This Community Service activity is carried out with the aim of implementing the Tri Dharma of Higher Education. This activity was carried out at MIS Halwani Gebang, Langkat, North Sumatra. The implementation of the activities includes the delivery of material regarding Introduction to Waste Sorting and Management, the Practice of Managing Organic Waste into simple compost and inorganic waste into useful crafts for students.

An oil spill at sea is the release of oil, either directly or indirectly, into the marine environment originating from shipping activities, oil and gas business activities, or other activities. In order to handle and prevent pollution due to oil spills, the IMO (International Maritime Organization) has made regulations that must be implemented in the world of international shipping. MARPOL Regulation 73/78 Annex 1 is a regulation issued to overcome this. In implementing this regulation, ships are required to have equipment in the form of an Oil Discharger Monitor (ODM). This tool functions as a monitor of activities in the process of disposing of waste into the sea by ships. So in this study the researcher wants to discuss the role of ODM (oil discharger monitor) in preventing marine pollution in accordance with MARPOL 73/28 Annex I standards.

Well water is still one of the main sources of daily water supply for the residents of the Candi Muaro Jambi area. The dependence on well water makes it vital for consumption, cooking, and other domestic activities. However, with the increasing human activity, the development of tourist areas, and environmental changes in the surrounding area, the quality of the well water is at risk of being affected. This study aims to evaluate the feasibility of well water from an environmental and health perspective based on physical, chemical, and biological parameters, referring to the clean water quality standards set by the Ministry of Health of the Republic of Indonesia. The research employs a descriptive quantitative method, with well water samples taken from several points around the residential areas in the Candi Muaro Jambi region. The analyzed parameters include temperature, color, odor, turbidity, pH, nitrate content, metal content (Fe and Mn), and the presence of coliform bacteria. Laboratory test results show that most of the well water samples still meet the established physical and chemical standards, but some wells were found to have coliform levels exceeding the recommended threshold. This condition indicates contamination, most likely from domestic waste, particularly from household sanitation systems that are not ideally located relative to the wells. While the well water in the study area is generally still suitable for daily use, it is recommended that the community performs simple water treatment, such as boiling or filtration, before direct consumption. These measures are crucial to reduce contamination risks and ensure the water's quality for safe consumption and health.

Tourism is one of the most important economic sectors in the world, contributing significantly to state revenue and improving people's welfare. The tourism industry has grown rapidly in recent decades, with the number of international tourists continuing to increase. The general objective of this study is to develop a deeper knowledge and understanding of the impact of uncontrolled tourism on the sacredness of Bali's nature and culture, as well as strategies for developing sustainable tourism in Bali. The type of research used by the author in examining the problems in this study is normative juridical research. The conclusion of this study is a legal review of the protection of natural and cultural heritage in Bali Province is regulated in several laws and regulations such as Law No. 5 of 1990 concerning the Conservation of Biological Natural Resources and Ecosystems. In addition, cultural protection in Bali has also been regulated in several laws and regulations such as Law No. 11 of 2010 concerning Cultural Heritage. This legal review will also discuss the implementation of laws and regulations related to the protection of natural and cultural heritage in Bali. The Bali provincial government's policy on the protection of natural and cultural heritage, namely the policy on the protection of natural heritage is regulated in the Governor's Regulation or Pergub No. These include Law No. 97 of 2018 concerning the Limitation of Single-Use Plastic Waste, Governor Regulation No. 45 of 2019 concerning Bali Clean Energy, Governor Regulation No. 48 of 2019 concerning the Use of Battery-Based Electric Motorized Vehicles, and Governor Regulation No. 8 of 2019 concerning Organic Farming Systems. Cultural heritage protection policies are regulated by Law No. 10 of 2010 concerning Tourism, Regional Regulation No. 2 of 2023 concerning the Bali Provincial Spatial Plan (RTRWP), the Designation of Cultural Heritage Areas in Bali, such as Ulun Danu Batur Temple and Lake Batur, the Subak Cultural Landscape and Temples in the Pakerisan Watershed, and others.

This study aims to analyze the development of the creative economy through the utilization of textile waste, particularly patchwork fabric, by leveraging digital platforms. Employing a qualitative approach with a case study method, the research involved creative entrepreneurs who transform patchwork waste into economically valuable products, such as bags, wallets, accessories, and home decorations. Data were collected using in-depth interviews, participatory observation, and document studies, and then analyzed thematically. The findings reveal that patchwork fabric waste can be successfully converted into high-value creative products through innovative designs and diversification strategies. Furthermore, the adoption of digital platforms, including social media and online marketplaces, plays a pivotal role in product promotion, enhancing brand awareness, and expanding market reach beyond local boundaries. This integration not only provides economic benefits, such as increased income for entrepreneurs and the creation of new job opportunities, but also fosters social and environmental impacts, including raising community awareness of sustainable waste management practices. The study emphasizes that the creative transformation of textile waste contributes to circular economy principles, supporting resource efficiency and reducing environmental burden. In conclusion, the integration of creativity, innovation, and digital technology utilization emerges as a sustainable strategy for developing a creative economy based on waste materials. These findings provide insights for entrepreneurs, policymakers, and communities in promoting environmentally friendly business models while simultaneously driving inclusive economic growth.

This research aims to develop a transaction data security system on the web-based Pancadaya Waste Bank application by applying a hybrid cryptographic algorithm that combines Advanced Encryption Standard (AES) and Rivest Shamir Adleman (RSA). The problem faced in the previous system is the weak recording and security of customer transaction data, because the process is still carried out manually so that it is prone to recording errors, loss of important information, and potential misuse of data by unauthorized parties. To answer these problems, this study uses the Rapid Application Development (RAD) method which allows the application development process to be carried out quickly, flexibly, structured, and according to user needs. The research method used was a qualitative approach with interview techniques with the management of the Pancadaya Waste Bank and the Environment Office, as well as an in-depth literature study on the application of hybrid cryptographic algorithms in modern information systems. The system is built using the PHP programming language, MySQL database, and OpenSSL library as the main support for the data encryption and decryption process. The implementation of the algorithm is carried out by encrypting transaction data using AES for efficiency and speed, then the AES key is secured through RSA to ensure a higher level of security while preventing illegal access. The test results showed that the system was able to encrypt and decrypt transaction data in real-time, as well as display transaction results in the form of digital notes on deposit and balance withdrawal activities. In addition, performance tests using GTmetrix showed that the application has excellent speed, stability, and processing efficiency, making it feasible to be widely implemented in Pancadaya Waste Bank operations.

This study aims to analyze the development process of a creative economy based on bead waste and the use of digital platforms as a marketing medium to increase product competitiveness. The background of the study is based on the phenomenon of increasing volumes of waste that have not been optimally managed and the low skills of business actors in utilizing digital technology. The research method used a qualitative approach with descriptive methods. Data were collected through in-depth interviews, participatory observation, documentation, and literature studies, with informants consisting of business actors, community leaders, representatives of relevant agencies, and consumers. The results of the study indicate that processing waste into beads not only reduces environmental impacts but also opens up creative business opportunities with high economic value. The use of digital platforms has proven effective in expanding market reach, improving branding, and driving sales, although there are still obstacles in the skills of digital entrepreneurs. This study recommends strengthening digital marketing capacity and ongoing mentoring for creative waste-based entrepreneurs to achieve economic and environmental sustainability. In addition, synergy between business actors, the government, and local communities is a crucial factor in supporting the development of a waste-based creative economy. The involvement of local governments through entrepreneurship training and facilitating access to technology is essential to address the challenge of limited digital capabilities of entrepreneurs. Local communities also play a role in maintaining sustainable production and encouraging innovation in bead designs based on local culture to add value and attract market share. This collaboration can create a conducive ecosystem for the growth of creative small and medium enterprises (SMEs), while strengthening local identity and increasing product competitiveness in national and global markets. Thus, developing a waste-based creative economy and utilizing digital marketing are relevant innovative strategies in addressing current economic and environmental challenges.

This research was carried out using a qualitative method through a direct survey conducted in Tangga Batu Village. The main goal of this study is to utilize corn cob waste into an alternative fuel product in the form of briquettes that is more environmentally friendly. Corn cobs are one of the abundant agricultural wastes, but they are often not used optimally. Through simple innovations, this waste can be processed into alternative energy sources that have economic value while having added value for the surrounding community. The process of making briquettes begins with the preparation of equipment which includes a kiln, mold, drying container, mash tool, strainer, and scale. The main ingredient is corn cobs that are first dried in the sun for 3–4 days to reduce the moisture content by 10–20%. Additional materials used are tapioca flour as an adhesive, small amounts of diesel, and water. The next stage is to compose the corn cobs in the burning pit for 20–30 minutes until they become charcoal. The charcoal is then scraped using a simple tool and sifted to separate the fine and rough parts. The fine charcoal is mixed with a starch adhesive from tapioca flour, then molded using a simple mold and compacted through a pressing process to produce good quality briquettes. Next, the briquettes are dried in the sun for 2-3 days until they are completely dry and ready to be used as fuel instead of wood or kerosene. The results of the study show that corn cob waste has great potential to be used as an alternative fuel. In addition to being environmentally friendly, these products also contribute to reducing dependence on fossil fuels.

This study investigates the potential of Low-Density Polyethylene (LDPE) plastic waste as a partial substitute for sand in concrete block mixtures, focusing on its effects on compressive strength and water absorption. LDPE is a non-biodegradable plastic waste that poses significant environmental challenges. Its incorporation into construction materials offers a promising solution to reduce pollution while enhancing the performance of building components. The research employed LDPE substitution levels of 10%, 15%, 20%, 25%, and 30% by weight of sand, compared against conventional concrete blocks without LDPE. Experimental results revealed that the highest compressive strength was achieved with a 15% LDPE mixture, reaching 80.762 kg/cm² at 28 days of curing—an increase of approximately 40.8% compared to normal blocks, which recorded 57.359 kg/cm². LDPE additions up to 20% maintained favorable strength characteristics, while higher proportions (25% and 30%) led to a decline in mechanical performance. In terms of water absorption, the inclusion of LDPE demonstrated a decreasing trend, attributed to the hydrophobic nature of plastic, which enhances moisture resistance in the concrete blocks. These findings suggest that a 15% LDPE substitution represents an optimal formulation for producing eco-friendly concrete blocks with improved strength and reduced water absorption. The study highlights the dual benefits of waste management and material innovation, aligning with sustainable development goals. By repurposing plastic waste into construction applications, this approach not only mitigates environmental impact but also contributes to the advancement of green building technologies. Further research is recommended to explore long-term durability, thermal properties, and scalability of LDPE-based concrete products in real-world construction settings.

This study aims to analyze the business development strategy of Siecraft, a creative that transforms waste into environmentally friendly and marketable products. The research uses a qualitative method with a case study approach through in-depth interviews, observation, documentation, and the distribution of questionnaires to 30 respondents. The analysis focuses on production, finance, marketing, and human resources, supported by a SWOT analysis. The results show that Siecraft’s main strengths lie in its unique products, use of waste materials, and social value. However, weaknesses remain in digital promotion and production management. The SWOT analysis places the business in Quadrant I (aggressive strategy). Development strategies are directed toward product innovation, improving digital promotion quality, and expanding partnerships to support business sustainability. However, despite these strengths, the business faces several challenges. The weaknesses identified include limited digital promotion efforts and inefficient production management. These areas require urgent attention to enhance overall business performance and market visibility. Furthermore, the SWOT analysis places Siecraft in Quadrant I, signifying an aggressive growth strategy. This suggests that the company should capitalize on its current strengths while addressing its weaknesses to achieve sustainable growth. The recommended development strategies include focusing on product innovation to keep up with market trends and customer demands. Improving the quality of digital marketing efforts is also crucial to expand its customer base and reach new markets. Additionally, expanding partnerships with other businesses and organizations can provide the necessary resources and networks to foster sustainability and long-term success. Overall, the business development strategy aims to strengthen Siecraft’s competitive edge and promote environmental consciousness while achieving financial success.

The problem of plastic waste in Gandan Hamlet, Pogalan Village, is becoming an increasingly urgent environmental issue that requires sustainable management. Unmanaged waste can pollute the soil, air, and water, and threaten public health. In response to this situation, Tidar University Community Service (KKN) students implemented an innovative community-based waste management program. The main focus of this program is to utilize plastic waste into products with utility and sales value, namely plastic-filled pillows and Eco-Paving Blocks. This activity was carried out through a participatory approach by actively involving the community at every stage, from outreach and education to technical training on the collection, sorting, and processing of plastic waste. The education provided concerns the dangers of plastic waste to the environment and the importance of recycling as an alternative solution. Making pillows from plastic filling was chosen because the process is simple, inexpensive, and can be done by housewives. Meanwhile, Eco-Paving Blocks are the result of utilizing mixed plastic waste as an environmentally friendly and durable building material. This program has succeeded in reducing the volume of plastic waste in the surrounding environment, while raising public awareness of the importance of environmental conservation. Furthermore, this activity opens up new economic opportunities for the community by creating creative products from waste. Evaluation results show that the community-based waste management model is effective in fostering community independence in waste processing, creating a cleaner environment, and encouraging a culture of sustainable living at the village level. The success of this program is expected to serve as an example for replication in other areas with similar challenges. Continued support from the village government and cross-sector collaboration are key to this initiative's continued growth and long-term impact.

The use of palm oil waste as boiler fuel is one of the innovative solutions in supporting the use of renewable energy while reducing the environmental impact of palm oil industry waste. Waste such as palm shells, mesocarp fibers, and empty oil palm bunches have high energy potential through direct combustion and other thermal technologies. This study aims to evaluate the potential use of palm oil waste as boiler fuel based on its calorific value, combustion efficiency, and environmental impact. The methods used include analysis of the physical and chemical characteristics of waste, boiler performance tests, and exhaust gas emission evaluation. The results show that palm oil waste has a high calorific value (15–20 MJ/kg), which makes it an efficient alternative fuel. In addition, the use of this waste is able to reduce dependence on fossil fuels while minimizing carbon emissions, thereby supporting the greenhouse gas emission reduction target. From an operational perspective, the use of palm oil waste in industrial boilers can increase combustion efficiency by up to 75–85%, depending on fuel conditions and boiler design. This makes palm oil waste not only economically valuable, but also strategic in supporting the transition to clean energy. Another advantage is that waste management becomes more targeted, because solid waste that is usually only an environmental burden can be reused as an energy source. However, some of the challenges that need to be considered include relatively high ash levels, the potential for corrosion in boiler equipment, and the need for emission control technology to comply with environmental standards. With the right mitigation strategy, palm oil waste can be processed into sustainable and environmentally friendly energy.

Solid waste from the tapioca processing industry, which is based on cassava (Manihot esculenta), is a medium rich in organic matter, particularly starch, that supports the growth of various types of microorganisms, especially fungi and bacteria. This study aims to isolate and observe the morphology of microorganisms from solid waste of cassava from the tapioca industry using Potato Dextrose Agar (PDA) medium in a series of pharmaceutical microbiology practicum. Waste samples were taken from the tapioca processing site, then underwent a serial dilution process and inoculation into PDA medium, which was incubated at 28–30°C for 5 days. The isolation results showed the growth of microorganisms with diverse colony morphologies, which are suspected to originate from the genera Aspergillus, Penicillium, and Rhizopus, based on macroscopic and microscopic characteristics. The presence of these microorganisms indicates the potential utilization of cassava waste as a source of microbial isolates for biotechnological and pharmaceutical applications, such as enzyme production and development of bioactive compounds. This practicum activity also contributes to increasing students' understanding of isolation techniques, microorganism characterization, and their role in biological-based waste management.

Data on waste generation in 2024, nationally, in the Special Region of Yogyakarta Province, and in Bantul Regency, consistently show organic waste as the largest component (more than 50%). Based on its source, the largest waste generation (53-75%) comes from households. This community service program aims to increase the participation of households in Trayeman Hamlet, Plered Village, Plered Sub-district, Bantul, in managing their own organic waste. This program is implemented through training for local PKK members. The methods presented are biopore, the covered bucket method, the stacked bucket method, the losida method, and the gallon method so that the community can easily adjust their choices. The training continued with the creation of composting tools, inoculant solutions, and biopore infiltration holes. Obstacles faced in organic waste management are the dependence of some residents on waste collection services. Supporting factors are the high community interest in gardening, the periodic garden utilization and cleanliness competitions held by the local village, and the commitment of PKK administrators to be able to process their organic waste independently.

The production process of graphite glass at ABC faces challenges in the form of waste that has an impact on low operational efficiency. Waste in production activities can affect the quality, cost, and timeliness of product completion. This study aims to identify the most dominant types of waste and provide relevant improvement recommendations to improve production efficiency. The method used is Value Stream Mapping (VSM), a visual approach that maps the flow of the production process from raw materials to final products. The research stage is carried out through direct observation on the production floor, time study, interviews with employees, and documentation of production activities. The results of the analysis show that the most dominant form of waste is overprocessing, which is a repetitive activity that does not add value to the product. This causes longer production cycle times and reduces the effectiveness of resource use. To overcome this, this study provides several recommendations, including: combining production processes that have similar functions, redesigning workflows to make them more concise, and eliminating activities that do not provide added value. The implementation of this improvement has proven to be effective by increasing the Process Cycle Efficiency (PCE) value from 45% to 67%. The increase in PCE reflects that the production process has become more efficient, the workflow is smoother, and the rate of waste has decreased significantly. In addition, the results of this study also confirm that the application of the VSM method can be a strategic solution in identifying sources of inefficiency, designing continuous improvements, and increasing the competitiveness of companies. Thus, the company is expected to continue to evaluate, control, innovate, and improve technology so that efficiency achievements can be maintained, expanded, and improved consistently and sustainably in the future.

Environmental issues are complex and increasingly important. This is also true in the industrial sector, particularly in the culinary industry. Currently, public awareness of environmental issues is increasing, leading consumers to consider eco-friendly factors in their daily lives. The concept of eco-friendliness in the coffee shop industry has become an increasingly popular trend. Especially in the food and beverage (F&B) industry, which plays a significant role in waste production, particularly plastic and food waste. Therefore, the concept of eco-friendly practices has emerged in the F&B industry. This can take the form of using environmentally friendly food ingredients, eco-friendly packaging, and the café concept itself, which conveys an eco-friendly image that can increase consumer purchasing interest. This is implemented by Fore Cafe and Coffee Galaxy Bekasi. This study aims to investigate how the eco-friendly concept is implemented and its impact on consumer purchasing interest at Fore Cafe & Coffee Galaxy Bekasi. The study employs a quantitative approach with a sample and population of 99 consumers of Fore Cafe & Coffee Galaxy Bekasi, selected randomly. The analysis uses validity tests, reliability tests, normality tests, and T-statistical test. The results of the research and data processing using SPSS version 25 showed that the Eco-Friendly concept had an effect on increasing consumer interest in purchasing Fore Cafe & Coffee Galaxy Bekasi, and certainly had a positive effect on environmental conditions.