WAKTU: Jurnal Teknik UNIPA

Adsorpsi Logam Krom (Cr) Total Limbah Cair Batik Menggunakan Karbon Aktif Ampas Kopi

2024-10-02T04:26:43+07:00

One of the contaminants produced by liquid batik waste is chromium (Cr), which is carcinogenic. The high hydrocarbon and cellulose content in coffee grounds can be used as active carbon to adsorb total Cr in batik liquid waste. This research aims to examine the quality of coffee grounds activated carbon, determine the capacity of coffee grounds activated carbon in reducing Cr levels in batik waste with variations in contact time and adsorbent mass. The variables in this study were the weight of coffee grounds activated carbon of 0.4, 0.8, and 1.2 grams and contact time of 30, 60, 90, 120, and 150 minutes. This research uses a batch system on a laboratory scale. This research shows that coffee grounds activated carbon can adsorb the highest synthetic waste Cr of 96.70%, which occurs at a coffee grounds activated carbon weight of 1.2 g and a contact time of 150 minutes. The Cr metal adsorption process using coffee grounds activated carbon fulfills the Langmuir equation. Coffee grounds activated carbon can adsorb 98.45% Cr from batik waste, the final concentration meets quality standards.

Tinjauan Ulang Produksi Biodiesel Berbahan Baku Limbah Minyak Zaitun Melalui Metode Esterifikasi Dan Transesterifikasi

2024-10-02T04:26:37+07:00

This work aims to analyze waste olive oil or olive pomace oil (OPO) used in producing biodiesel by applying esterification and transesterification reactions. Due to OPO's high acidity index (IK), the handling of biodiesel production uses an esterification reaction to reduce this index. This process also aims to prevent saponification reactions from occurring during the transesterification reaction. The appropriate esterification parameters were determined in a few minutes with the molar ratio of methanol: oil which was 8:1 with a yield of 0.75 mg KOH/g IK oil. Olive oil is a non-edible oil with low production costs, making it an essential source of biodiesel production. This material can be used as a cheap raw material for enzyme immobilization. Even though OPO is non-edible, this raw material has economic value for biodiesel production. Still, it must be used to conduct transesterification in oils high in free fatty acids. Therefore, as pretreatment, the amount of free fatty acids in OPO must be reduced by acid esterification. Thus OPO can undergo a transesterification process to become a biodiesel product.

Evaluasi Agrowisata Idola D’Ganjaran di Desa Sambibulu Kecamatan Taman Sidoarjo

2024-10-02T04:26:41+07:00

Sambibulu Agrotourism is located in Sambibulu Village, Taman Sidoarjo District. This place is a paddy field but now it has changed its function into agro-tourism which is managed by a village-owned enterprise (BUMDes), with an area of 5 hectares and 1.5 hectares of land used for game ponds and fishing. Before the arrival of Covid, the D'Ganjaran idol agro tourism was very crowded with visitors in 2019 in February 65%, March 52% and April 35%. after there was a government policy regarding covid 19 the number of tourists decreased by 30% because of that D'Ganjaran idol agrotourism was only open on holidays, namely Sundays. So there needs to be an evaluation to build the existence of D'Ganjaran idol agrotourism in Taman District. This study aims to determine the characteristics of the D, Ganjaran agro-tourism area and the discovery of the existence of Idola D'Ganjaran agro-tourism in Taman Sidoarjo District. Methods of data collection using the study of relevant agencies, interviews, documentation, and observation. The analytical technique used is descriptive qualitative with situation analysis and evaluation and Skechup design. The results showed that D'Ganjaran's idol Agrotourism was more of an agro-tourism attraction, this was seen from the variety and attractions presented such as water agro-tourism and artificial rides. The results of the evaluation of the main facilities and supporting facilities with a percentage of 73.68%, and 26.31% that are not appropriate. Those that are not suitable include the main nursery facilities, entertainment stage facilities, telephone and communication network facilities, and supporting facilities that are not suitable such as guardrail facilities, and trash can facilities.

Analisis Pemetaan Daya Dukung Dan Daya Tampung Lingkungan Penyedia Air dan Pangan Berbasis Jasa Lingkungan

2024-10-02T04:26:39+07:00

Ngawi Regency Regional Regulation Number 10 of 2011 concerning Ngawi Regency Spatial Planning for 2010-2030, Widodaren District is directed to become a Local Activity Center (PKL). As time goes by population growth and rapid development in Widodaren District without adjusting the carrying capacity and capacity of water and food providers has an impact that exceeds environmental capacity. This research aims to determine the physical and non-physical characteristics of the area in Widodaren District, the carrying capacity and capacity of water and food providers, and directions for its development. The research method uses quantitative analysis with carrying capacity and capacity analysis techniques, as well as content analysis using Nvivo software. Data collection methods include field observations, documentation and surveys of related agencies. The results of the Carrying Capacity analysis using the environmental services approach for the water and food supply sector show the highest results, namely areas with high - very high class food provision environmental services have an area of + 5,233.3 Ha or 46.6% of the total area of Widodaren District, for water providers areas with high – very high class environmental services have an area of 8,683.4 Ha or 77.3% of the total area of Widodaren District, which means that the agricultural, industrial, energy, raw water supply sectors for urban, rural areas, and so on can be supported its development. Meanwhile, the direction for developing food providers that can be carried out is the

Identifying Habitat Selection Concept as Results of Place Attachment Phenomenon in Kampung Keputran, Surabaya

2024-10-02T04:26:35+07:00

This study investigates the complex phenomenon of place attachment and its impact on the formation and preservation of individual and communities’ identities to its cultural environment. Keputran kampung, situated in Surabaya's central business district, faces unique challenges such as annual flooding and the risk of eviction due to land ownership issues. Using qualitative descriptive research, including character appraisal, interviews, and observations, this study examines the place attachment phenomenon and its implications for its habitat selection concepts. Findings reveal the rapid development and strong characteristics of Keputran Village, classified as a attachment to a place stage with six identified factors influencing habitat selection on the residents' cultural aspects, emotions, cognition, and behavior. This study sheds light on the multifaceted nature of place attachment and its role in shaping the habitat selection concepts of Keputran kampung.

Pemetaan Kawasan Rawan Bencana Tanah Longsor Dengan Menggunakan Metode Weighted Overlay Di Kecamatan Ngrambe Kabupaten Ngawi

2024-10-02T04:26:32+07:00

Ngawi Regency Regional Regulation Number 10 of 2011 concerning the Ngawi Regency Spatial Planning Plan for 2010-2030, Article 23 paragraph 2, Ngrambe District is included in the landslide-prone area and is classified as the most landslide-prone area because it has a geographical location close to bare and critical forests besides its location on the slopes of Mount Lawu. The method used in this study is quantitative with data collection techniques used in the study, namely Observation and Related Agencies. The purpose of the study was to determine the level of landslide-proneness using the Weighted Overlay Landslide Method in Ngrambe District. The results of the analysis based on the calculation of the spatial analysis, it is known that the results of the Weighted Overlay analysis in the landslide-prone area in Ngrambe District show the results of landslide vulnerability, namely low with an area of 3401.16 Ha, medium with an area of 1676.69 Ha, high with an area of 405.43 Ha, and very high with an area of 1410.61 Ha.

Implementation of the seven tools method for controlling cardboard box quality at PT. SGM

2024-10-02T04:26:30+07:00

PT.SGM is a company that operates in the industrial business sector and the paper packaging sector. This company has tried to implement a good quality control system for its products. The company makes every effort to ensure that the quality of its products always meets the standards required by customers. The aim of this research is to identify the dominant level of defects, analyze the factors causing defects, minimize defects and make recommendations for improvements to improve the quality of the carton box products produced by carrying out analysis using the Seven Tools method. By using the Seven Quality Tools method, this method has proven to be quite good and effective in analyzing various types of defects that occur and can explain the factors that cause product defects. So we get the most dominant defect results from March to July, namely Open Sheet defects with an average number of defects of 6649 and a percentage of 44.7%. For the second, there are ink splattered defects with an average number of 5481 with a percentage of 36.9%. And the smallest defect in Krepek Sheet is 3768 on average and the percentage is 25.3%. Based on the research results, it was found that the most dominant percentage of defects was caused by poor raw materials and lack of maintenance on the machine.

Advanced Analysis and Problem-Solving in the Industry: A Strategic Approach to Assisting PT. XYZ in Overcoming Operational Challenges

2024-10-02T04:26:28+07:00

This research aims to solve operational challenges at PT. XYZ using advanced methodologies and strategic approaches, with a specific focus on enhancing Overall Equipment Effectiveness (OEE) and Total Productive Maintenance (TPM). OEE serves as a critical performance metric encompassing availability, performance, and quality to provide a comprehensive view of equipment efficiency. The integration of TPM, emphasizing proactive and preventive maintenance, further supports these goals by engaging all employees in maintaining and improving equipment performance. The research prioritizes first-tier machine improvements such as optimizing the gripper area, pneumatic systems, strap holding clamps area, nose wire, transfer conveyor, and cutting area. Additionally, second-tier enhancements in production systems involve refining scheduling processes to prevent operator shortages, providing ongoing training to maintain operator proficiency, and ensuring readiness across all production needs. These measures aim to systematically address the root causes of inefficiencies, ultimately enhancing overall operational effectiveness in alignment with organizational objectives and standards, thereby fostering a more streamlined and productive manufacturing environment.