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All Journal AL KAUNIYAH Jurnal Biologi Tropis Spizaetus: Jurnal Biologi dan Pendidikan Biologi Jurnal Abmas
Restu Utari Dewina
Universitas Pendidikan Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Materials Science & Nanotechnology Other

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Chromium Bioremediation Using a Combination of Two Indigenous Rhizobacteria In Vitro Wahyu Surakusumah; Nurul Ilma Apriliani; Diah Kusumawaty; Wijanarka Wijanarka; Achmad Dinoto; Restu Utari Dewina
Al-Kauniyah: Jurnal Biologi Vol. 19 No. 2 (2026): AL-KAUNIYAH: JURNAL BIOLOGI
Publisher : Department of Biology, Faculty of Science and Technology, Syarif Hidayatullah State Islami

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/kauniyah.v19i2.44529

Abstract

Sukaregang, known for its leathercraft industry, faces chromium pollution from poorly managed tannery waste, affecting soil and water resources. The dynamic soil area influenced by plant roots, known as the rhizosphere, becomes a habitat for various microorganisms with unique metabolic capabilities that have significant potential as bioremediation agents for heavy-metal-contaminated environments. This study aims to evaluate the potential of indigenous bacterial consortia from the chromium-contaminated rhizosphere as bioremediation agents. Five bacterial genera: Pseudomonas, Citrobacter, Bacillus, Azotobacter, and Micrococcus, were identified as chromium-resistant in vitro. Compatibility tests showed that these bacterial combinations exhibited synergies without growth inhibition. Among the five consortia combinations tested (AB, BC, CD, DE, EA), consortium DE (Azotobacter and Micrococcus), exhibiting the most stable growth dynamics, characterized by a sustained stationary phase, suggesting a superior adaptive response to chromium-induced stress. Under chromium stress, the consortium EA (Micrococcus and Pseudomonas) achieved the highest chromium removal percentage at 30.78%. This study suggests that indigenous rhizobacterial consortia could be a practical approach to remediate chromium pollution in areas like Sukaregang.
Peningkatan kualitas air pada budidaya ikan nila menggunakan sistem filtrasi bertingkat Wahyu Surakusumah; Diah Kusumawaty; Restu Utari Dewina; Aisyah Belva; Fadya Oktavia; Kirey Qanita; Naneu Nurfarida; Siti Nabila
Jurnal Abmas Vol. 26 No. 1 (2026): Jurnal Abmas
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/abmas.v26i1.670

Abstract

Algal bloom in Nile tilapia (Oreochromis niloticus) culture systems based on Recirculating Aquaculture Systems (RAS) can degrade water quality and increase the risk of fish stress. This community service program aimed to implement a multi-stage filtration system as an eco-friendly and energy-efficient solution to control microalgae growth and improve water quality in Nile tilapia culture ponds. The program was conducted through a Biology Study Program consultancy project involving lecturers, students, and the Padasuka Nila Cimahi aquaculture partner. The filtration system combined mechanical and biological filtration using fishing nets, gravel, kaldness K1, filter brushes, coral stones, and zeolite. Water quality parameters, including pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and total ammonia, were evaluated before and after system implementation. The results showed that the filtration system reduced pH from 9.18 to 7.60, EC from 284 µS/cm to 212 µS/cm, TDS from 147 ppm to 115 ppm, and total ammonia from 0.5 mg/L to 0.18 mg/L. In addition, pond water became visually clearer, and microalgae growth decreased significantly. The multi-stage filtration system proved to be an effective, low-cost, and sustainable approach for improving water quality in small- to medium-scale Nile tilapia aquaculture systems.
Karakterisasi Isolat Bakteri Asal Tanah Tercemar Kromium Berdasarkan Identifikasi Molekuler dan Respons Pertumbuhan terhadap Cr(VI) Wahyu Surakusumah; Abelia Rahmah Oktaviani; Hertien Koosbandiah Surtikanti; Peristiwati Peristiwati; Restu Utari Dewina
Spizaetus: Jurnal Biologi dan Pendidikan Biologi Vol 7 No 3 (2026): Spizaetus: Jurnal Biologi dan Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi, FKIP, Universitas Nusa Nipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55241/spibio.v7i3.851

Abstract

Environmental pollution caused by heavy metals such as chromium is found in various industrial activities, including the leather tanning industry. One approach to address such pollution is bioremediation using microorganisms. In its application, microorganisms must undergo detailed taxonomic identification to the species level to minimize competition among bacterial strains. This study aimed to investigate the biochemical characteristics, molecular identities, and growth responses of bacterial isolates under chromium stress. An experimental method with a descriptive quantitative design was employed. Four bacterial isolates from heavy-metal-contaminated rhizosphere soil were identified through biochemical tests, 16S rRNA gene analysis, and growth observation. Data were analyzed using the Man-Whitney U test to determine whether Cr(VI) stress significantly affected the growth of the isolates. The results identified four Bacillales isolates: Bacillus sp., Bacillus licheniformis, Bacillus paralicheniformis, and Brevibacillus borstelensis. All isolates grew at 500 ppm, while B. paralicheniformis grew at concentrations up to 1000 ppm. This study provides information on the potential of rhizosphere bacteria as bioremediation agents for chromium-contaminated environments.
Bioethanol Production from Cassava Peel Powder Sugar Hydrolysate by Yeasts Saccharomyces cerevisiae and Pichia anomala Dhini Agustin; Peristiwati Peristiwati; Wahyu Surakusumah; Restu Utari Dewina
Jurnal Biologi Tropis Vol. 26 No. 4 (2026): in Progress
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i4.13013

Abstract

Heavy reliance on fossil fuels has driven the search for renewable energy, including bioethanol produced from lignocellulosic biomass. Although Saccharomyces cerevisiae is the yeast most commonly used for bioethanol because of its high productivity, it cannot efficiently ferment pentose sugars, which restricts its application to lignocellulosic feedstocks. Pichia anomala, a non-conventional yeast able to ferment both glucose and xylose, is therefore a promising alternative. This study compared how well S. cerevisiae and P. anomala produce bioethanol from a sugar hydrolysate of cassava (Manihot esculenta) peel powder. The powder was first delignified with 6% NaOH and hydrolyzed with 3 M H₂SO₄, followed by 72 hours of microbial hydrolysis with Aspergillus niger. Each yeast was then grown for 96 hours under anaerobic conditions at its own optimum (S. cerevisiae: 31°C, pH 4.5; P. anomala: 30°C, pH 5), and ethanol was quantified by HPLC. Microbial hydrolysis raised the reducing sugar content from 2.43% to 6.27%. Cell growth, substrate utilization, and ethanol production did not differ significantly between the yeasts (p > 0.05); however, P. anomala reached a numerically higher ethanol concentration (0.89%) than S. cerevisiae (0.60%), suggesting that it could serve as an alternative fermentative yeast. Fermentation efficiency and ethanol yield were 19.6% and 10% for S. cerevisiae, and 29.2% and 14.9% for P. anomala; both were below values in earlier reports, indicating that the process can still be optimized.
Co-Authors Abelia Rahmah Oktaviani Achmad Dinoto Aisyah Belva Dhini Agustin Diah - Kusumawaty Fadya Oktavia Kirey Qanita Naneu Nurfarida Nurul Ilma Apriliani Peristiwati Peristiwati Siti Nabila Surtikanti Hertien Koosbandiah, Surtikanti Wahyu Surakusumah Wijanarka Wijanarka