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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Teknik Kimia dan Lingkungan
Putri, Theodora Mega
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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IDENTIFICATION OF PLANT GROWTH PROMOTING PROPERTIES OF BACTERIA ISOLATED FROM WATER HYACINTH (Eichhornia Crassipes) ROOTS Putri, Theodora Mega; Tambun, Rizka Arta Rossa; Martgrita, Merry Meryam
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol. 12 No. 1 (2025): Biolink August
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v12i1.15121

Abstract

Plant growth-promoting bacteria (PGPB) play an important role in enhancing plant growth and productivity through various biological mechanisms, such as phosphate solubilization and nitrogen fixation. This study aims to isolate and identify PGPB from the roots of water hyacinth (Eichhornia Crassipes) growing in Lake Toba, and to evaluate its potential in supporting the growth of lettuce (Lactuca sativa). Three rhizosphere bacteria were obtained and identified morphologically and biochemically as Bacillus thuringiensis (EGR1), Bacillus megaterium (EGR2), and Azotobacter vinelandii (EGR3). All three isolates showed the ability to solubilize phosphate, while only EGR3 was able to fix nitrogen. Bioassay tests using lettuce showed that EGR2 increased plant height, while EGR3 significantly increased fresh weight, number of leaves, and length of roots. These findings indicate the potential of EGR3 as a promising natural biofertilizer candidate to support sustainable agriculture.
Comparative Study of Biomethane Purification Process using Analytical Hierarchy Process Putri, Theodora Mega; Simanjuntak, Berlian; Rumahorbo, Eyunike; Panggabean, Kristy
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7428

Abstract

The selection of purification technology for upgrading biogas to biomethane involves complex considerations, as each technology -such as pressure swing adsorption (PSA), membrane separation (MS), or chemical absorption (CA) - offers distinct advantages and disadvantages. The Analytical Hierarchy Process (AHP), provides a systematic framework to simplify and resolve such complexities. This research aims to apply AHP to critically compare purification technologies for biomethane. AHP method is implemented in four steps which includes determination of AHP structure (goal, criteria, sub-criteria and alternatives), formation of pairwise comparison matrices based on literature study and expert opinion, normalization and consistency calculation, and prioritization of alternatives. The criteria considered in AHP analysis of this study are technology capacity, cost, and environmental impact. Overall, PSA received the highest weight for state of technology. In terms of separation performance, CA achieved the highest scores for methane purity and methane retention. From a cost and environmental impact perspective, MS performed best.  However, despite its advantages, MS application is limited by its relatively lower maturity and limited scalability.  By evaluating alternatives based on AHP framework, PSA was identified as the top-priority option, with total weight score of 0.426, followed by MS with total weight score of 0.387 and CA with total weight score of 0.181. This study has successfully demonstrate the application of AHP to select purification technologies for converting biogas to biomethane.
Co-Authors Martgrita, Merry Meryam Panggabean, Kristy Rumahorbo, Eyunike Simanjuntak, Berlian Tambun, Rizka Arta Rossa