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All Journal Journal of Biobased Chemicals (JOBC) Venus: Jurnal Publikasi Rumpun Ilmu Teknik Jurnal Kendali Teknik dan Sains
Vikhory Bagus Wahyu Nugroho
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering

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Analisis Pengaruh Musim Penghujan Dan Musim Kemarau Terhadap Kualitas Wilayah Sungai Brantas Vikhory Bagus Wahyu Nugroho; Juan Vincent Elfonda; Tuhu Agung Rachmanto
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 2 No. 3 (2024): Juni : Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v2i3.360

Abstract

The Brantas River is a large river in East Java that has an important role for the community. Seasonal changes have an impact on the quality of the Brantas River in Indonesia. Testing is conducted by comparing samples taken twice a year, representing the dry and rainy seasons. The river's quality is analyzed based on several parameters such as Dissolved Oxygen (DO), BOD, COD, NO3-N, and Phosphate. The results are then compared with the standard river quality according to Government Regulation No. 22 of 2021. The analysis results indicate that the season has a significant impact on the river water quality, as seen from the different parameters in each season.
Klasifikasi Tutupan Lahan di Kabupaten Trenggalek Menggunakan Google Earth Engine Juan Vincent Elfonda; Vikhory Bagus Wahyu Nugroho; Tuhu Agung Rachmanto
Jurnal Kendali Teknik dan Sains Vol. 2 No. 3 (2024): Juli: Jurnal Kendali Teknik dan Sains
Publisher : International Forum of Researchers and Lecturers

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/jkts-widyakarya.v2i3.3488

Abstract

Land cover is defined as the physical and biological cover of the earth's surface, both those formed naturally such as swamps, hills and rivers and those formed by man-made means such as rice fields, gardens, forests and buildings. As technology develops, conventional methods of satellite image processing are starting to be abandoned. This is because conventional methods require quite a long time to process satellite image data. The presence of Google Earth Engine (GEE), which is a cloud computing-based platform, makes it easier for users to process satellite image data boldly and for free. This research aims to classify satellite image land cover in the Trenggalek Regency area, East Java. The level of accuracy in this study uses a confusion matrix. The accuracy test results show a value of 90.23%.
Effect of Cow Rumen Substrate Addition on Anaerobic Digestion Efficiency Under Acidic Conditions Vikhory Bagus Wahyu Nugroho; Aussie Amalia; Rizka Novembrianto
JOBC Vol. 5 No. 2 (2025): Journal of Biobased Chemicals
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v5i2.46

Abstract

Organic waste management has become a significant issue, particularly with the increasing amount of waste generated from agricultural, livestock, and household activities. One of the most widely applied technologies is the biodigester, which utilizes anaerobic digestion to decompose organic matter into compost and biogas. However, conventional biodigesters often face limitations in methane production efficiency, which is strongly influenced by substrate quality and microbial diversity. Rumen substrate from cows contains cellulolytic and methanogenic microbial communities that play a key role in accelerating the degradation of complex organic matter and enhancing methane production. This study aimed to investigate the impact of varying rumen substrate amounts on the performance of biodigesters. Three treatments were applied: no rumen addition, addition of 1 Kg, and addition of 2 Kg. Parameters observed included C/N ratio, pH stability, and methane gas percentage during a 35-day anaerobic fermentation period. The results showed that the biodigester with 1 Kg of rumen achieved a C/N ratio of 21.23, which falls within the optimal range of 20–30. Meanwhile, the biodigester with 2 Kg of rumen produced the highest methane percentage, reaching 0.0185% v/v on day 14, although production gradually declined thereafter. Overall, the addition of rumen was proven to improve the C/N ratio, stabilize pH, and enrich microbial communities, thereby enhancing methane production efficiency. These findings suggest that rumen substrate can be considered a potential co-substrate to enhance biodigester performance and facilitate sustainable organic waste management.
Co-Authors Aussie Amalia Juan Vincent Elfonda Tuhu Agung Rachmanto