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All Journal International Journal of Renewable Energy Development Journal of Public Health for Tropical and Coastal Region Madani : Indonesian Journal of Civil Society
Widuri, Hasri
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Humanities Chemistry Energy

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Energy Analysis of a Hybrid Solar Dryer for Drying Coffee Beans Suherman Suherman; Hasri Widuri; Shelyn Patricia; Evan Eduard Susanto; Raafi Jaya Sutrisna
International Journal of Renewable Energy Development Vol 9, No 1 (2020): February 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.1.131-139

Abstract

In this study, hybrid solar drying of coffee beans was performed, and energy analysis was carried out, to assess the system’s performance, in terms of energy efficiency, compared to solar drying and the open sun drying method. The dryer has three compartments: solar collector for collecting solar radiation, drying chamber, and a Liquid Petroleum Gas burner, which acted as an auxiliary heater to assist the thermal energy. The drying chamber has four trays for placing the dried product. The initial moisture content of coffee beans was 54.23% w.b and was reduced to the final moisture content between 11-12% w.b. The coffee beans dried faster when subjected to the solar hybrid drying method, compared to other methods, with the dryer temperature of 40°C, 50°C, and 60°C. Results indicated that the coffee beans’ drying times varied from 10 to 14 hours. However, at temperature 50°C and 60°C for the 1st tray, the water content was reduced more rapidly compared to the other tray. From the results of this study, we can see the different efficiency of solar collector that shows of 54.15% at variable temperature 60°C for drying time 12:00 to 14:00 p.m for hybrid solar drying and for the solar drying process is 50.07% at the range of drying time 12:00 to 14:00 p.m. Mathematical modelling shows that Page model is the most suitable for describing the coffee beans’ drying behaviour using a hybrid solar dryer. The effective diffusivity values found in this experiment are all in the acceptable range for most agricultural products. ©2020. CBIORE-IJRED. All rights reserved
Analysis of Wastewater Quality at the Indonesian Red Cross (PMI) in Cilacap Regency Rakhmawati, Nita Sofia; Widuri, Hasri; Febrianti, Tessa Sukma
Journal of Public Health for Tropical and Coastal Region Vol 8, No 2 (2025): Journal of Public Health for Tropical and Coastal Region
Publisher : Faculty of Public Health, Universitas Diponegoro, Semarang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jphtcr.v8i2.28045

Abstract

Introduction: Increasing volume of medical wastewater presents a significant challenge for environmental management, particularly in healthcare facilities such as the Blood Donor Unit (UDD) of the Indonesian Red Cross (PMI). Inadequate wastewater treatment can lead to environmental pollution and pose serious public health risks. This study aimed to evaluate the performance of a Wastewater Treatment Plant (WWTP) at the UDD PMI in the Cilacap Regency by analyzing key physical, chemical, and biological parameters.Methods: This study employed a descriptive, quantitative approach. Wastewater samples were collected from the WWTP outlet using random sampling. The samples were placed in sterile bottles, stored at low temperatures, and analyzed at Cilacap Environmental Agency Laboratory using standardized methods for water and wastewater examination (APHA, 2017). The parameters tested included pH, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), oil and grease, ammonia, and total coliform.Results: The physical parameter (TSS: 18 mg/L) and chemical parameters (pH: 8.0; BOD: 7 mg/L; COD: 10 mg/L; oil and grease: 1.9 mg/L; ammonia: <0.01 mg/L) were all within acceptable regulatory limits. However, the biological parameter of total coliforms exceeded the permissible threshold (>24,000 MPN/100 mL), indicating possible fecal contamination. This result highlights a significant risk to both public health and the environment.Conclusion: Although WWTP are equipped with standard treatment units, their disinfection process is insufficient, posing the potential risk of waterborne disease transmission (e.g., cholera). Therefore, immediate improvements in disinfection systems are recommended. 
Program Peningkatan Kesehatan Kerja melalui Edukasi Ergonomi dan Gaya Kerja Sehat pada Pekerja Home Industry Rakhmawati, Nita Sofia; Widuri, Hasri; Cahyo, Micko Teguh Tri
Madani : Indonesian Journal of Civil Society Vol. 8 No. 1 (2026): Madani : Februari 2026
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/98rp1z73

Abstract

The lanting home industry in Cilacap Regency plays an important role in supporting the local economy. However, the predominantly manual production process places workers at risk of musculoskeletal disorders due to non-ergonomic working postures. This community service program aimed to improve occupational health among lanting workers through ergonomic education and the implementation of healthy work practices. The activity was conducted at one lanting home industry in Cilacap Regency and involved 30 workers. Evaluation was carried out using pre–post tests to assess changes in knowledge levels, complemented by observations of work behavior at the production site. The results showed a significant increase in workers’ knowledge, indicated by an increase in the proportion of workers in the high-knowledge category from 10% before the intervention to 73% after the intervention. Workers began to adopt better working postures, perform light stretching during work breaks, and demonstrated collective awareness by reminding each other to maintain proper working positions. The program proved to be effective, affordable, and easy to implement in improving awareness and healthy work behaviors in small-scale lanting home industries. This activity has the potential to be further developed as a simple ergonomic intervention model for similar traditional food industries.
Co-Authors Cahyo, Micko Teguh Tri Evan Eduard Susanto Febrianti, Tessa Sukma Raafi Jaya Sutrisna Rakhmawati, Nita Sofia Shelyn Patricia Suherman Suherman