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All Journal International Journal of Hydrological and Environmental for Sustainability
Yongthong, Keodouangdy
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Environmental Science

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Assessment of Hydrochemical Characteristics and Water Quality as Monitoring of Environmental Conditions in Shallow Groundwater and Kinokawa River, Wakayama Prefecture, Japan Palupi, Endah Kinarya; Yongthong, Keodouangdy; Trinugraha, Afi Candra
International Journal of Hydrological and Environmental for Sustainability Vol. 3 No. 2 (2024): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v3i2.481

Abstract

Shallow groundwater and river water problems in each country are caused by various factors such as natural factors such as natural disasters, human activity factors such as waste pollution, and others. In this study, we analysed the hydrochemical characteristics of river water to determine the water quality of shallow groundwater and Kinokawa river in Wakayama region of Japan. Shallow groundwater and river water samples were taken along the Kinokawa river at a total of 86 points. The water samples were analysed using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). In this case, we investigated physicochemical parameters such as total dissolved solids which mainly depend on the concentration of major ions such as Ca, Mg, Na, K, Cl, Li, HCO3, NO3 and SO4 which are used to characterise river water quality. The results of this study show that the calculated values of SAR, PI, Na%, MH and RSC indicate good groundwater use for irrigation purposes. Comparison of geochemical data showed that more than 75% SAR, 94% PI, 80% %Na, and 97% MH indicated a good environmental condition category and the river water can be used for irrigation purposes. The water quality information presented in this paper will be useful for sustainable management of water resources in the study area.
Sustainable Bioethanol Production from Carica (Carica pubescens) Peel Waste: Optimization of Acid Hydrolysis and Fermentation Time Ubaidilah, Sofana; Irfan, Akhmad; Sunaryo, Sunaryo; Yongthong, Keodouangdy; Sampurno, Rizky Mulya; Radhitya, Berwyn Dzaky
International Journal of Hydrological and Environmental for Sustainability Vol. 4 No. 2 (2025): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v4i2.771

Abstract

The global energy crisis and continued reliance on fossil fuels have intensified the search for sustainable alternative energy sources, particularly biomass-derived biofuels. One promising yet underutilized resource is the peel waste of Carica pubescens, a papaya variety indigenous to the Dieng Plateau. This study investigates the potential of Carica peel waste as a bioethanol feedstock through sulfuric acid (H₂SO₄) hydrolysis and fermentation using Saccharomyces cerevisiae. To optimize sugar yield, the concentration of H₂SO₄ was varied between 0.1 M and 0.8 M, while fermentation durations were set at 96, 120, 144, and 168 hours. Results indicated that hydrolysis with 0.8 M H₂SO₄ produced the highest sugar concentration (6.8%). The most effective fermentation period was 120 hours, yielding 64% bioethanol with a density of 0.8679 g/mL, a calorific value of 4,831 kcal/kg, a flame height of 14.6 cm, and a combustion temperature of 438°C. These findings demonstrate the viability of Carica peel waste as a valuable raw material for bioethanol production. Its high efficiency and favorable fuel properties highlight its potential for integration into local renewable energy initiatives, contributing to sustainable energy development. Further studies on large-scale implementation and process optimization are recommended to maximize its industrial application.
Hydrological Effects on Rock Mass Quality and Rippability of Heterogeneous Karstic Limestone Wijaya, Andy Erwin; Misdiyanta, Partama; Prastowo, Rizqi; Mitsui, Yoshitaka; Yongthong, Keodouangdy; Radhitya, Berwyn Dzaky
International Journal of Hydrological and Environmental for Sustainability Vol. 5 No. 1 (2026): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v5i1.1122

Abstract

The proposed study area is located approximately 1.9 km southwest of the main cement plant in Tuban, Indonesia. This research aims to evaluate the rippability characteristics of the limestone formation underlying the planned development site. The assessment is based on data obtained from a geotechnical borehole investigation (CR-1), integrated with previous subsurface exploration results. The site is designated for shallow foundation systems designed to withstand bearing pressures ranging from 300 to 800 kPa. Subsurface conditions are characterized by karstic limestone with complex hydrogeological features. The limestone exhibits high sensitivity to water infiltration, dissolution processes, and mechanical property degradation under saturated conditions. Significant spatial variability in rock mass quality and strength is observed over relatively short vertical and horizontal distances. The uppermost layer comprises residual lateritic (red) soil derived from in-situ weathering of the underlying limestone. The presence of limestone gravels and boulders within the residual soil indicates a transitional interface between the overburden and the more competent limestone strata. The limestone formation consists of heterogeneous materials, including highly porous honeycomb-textured rock and relatively intact, sound limestone, distributed irregularly across the site. This heterogeneity results in considerable variability in mechanical strength and excavation response. The findings provide essential insights into the rippability behavior of the limestone and its implications for foundation design and construction planning in karst environments.
Co-Authors Irfan, Akhmad Misdiyanta, Partama Mitsui, Yoshitaka Palupi, Endah Kinarya Radhitya, Berwyn Dzaky Rizky Mulya Sampurno Rizqi Prastowo Sunaryo Trinugraha, Afi Candra Ubaidilah, Sofana Wijaya, Andy Erwin