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All Journal Planta Tropika Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) JURNAL PERTANIAN Tropical Plantation Journal
Renjani, Rengga Arnalis
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Agriculture, Biological Sciences & Forestry Engineering Veterinary

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The Potential of Biogas Slurry and Palm Oil Mill Effluent Slurry as Slow-Release Fertilizer Pellet Through Densification Widyowanti, Reni Astuti; Ginting, Candra; Renjani, Rengga Arnalis
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 9, No 2 (2021)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v9i2.9588

Abstract

Organic fertilizer can yield higher production compared to regular fertilizer if properly applied. Thus, it can be a solution to improve nutrient content of soil. The biggest source of bio slurry in plantation is from Palm Oil Mill Effluent (POME) and cow dung biogas. This research aimed to analyze the residue’s potential from the result of biogas processing and bio slurry from POME as slow-release fertilizer pellet. Bio slurry was processed into pellet through densification process using pellet mill. The research was arranged in a Randomized Block Design method with five slurry compositions as treatments, including 70:30, 60:40, 50:50, 40:60, and 30:70 (ratio of biogas slurry and POME slurry), each consisted of three replications. According to the data obtained, fertilizer pellets had characteristics of 25 – 29 mm of length, 5.23 – 5.85 mm of diameter, 0.44 – 0.53 g/cm3 of density, 54.78% - 81.96% of durability, and 7.81% - 8.57% of moisture content. Based on density and durability aspects, 30:70 composition was the higher. Macronutrient content of the five compositions were 1.88% - 2.72%, in which on day 22, N, P, and K release was 0.36 – 1.01%, 73.51 – 97.48%, and 3.19 – 7.85%, respectively. Meanwhile, on day 17, the nutrition solution conductivity of all compositions had already reached 0.80 – 1 mS/cm.
Analysis of Sterilizer Oil Losses through Variations in Pressure and Boiling Time with Dominated Fresh Fruit Bunch Overripe Fraction Renjani, Rengga Arnalis; Panjaitan, Boy Doli; Fadhillah, Nabillah Nissya; Purwoto, Harsunu
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 1 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v12i1.598

Abstract

The problem is that not all FFBs processed daily are more than 90% ripe fruit, causing the yield not to reach the target. This study aims to analyze condensate oil losses from non-standard FFB quality (FFB overripe as much as 25-26%) against time and pressure variations in the sterilizer. The observed indicators include oil losses, moisture content, and non-oil solids (NOS). The study was conducted in 2 stages; the first stage was to test the length of boiling time for each peak stew. The second stage is divided into two pressure variations treatments at each stew's peak. The quantitative presented data is analyzed using simple statistics. All data analyzed statistically is presented in graphical form to visualize the data distribution. In overripe FFB conditions, as much as 25-26% shows that the three best times for peak 1 are 10 minutes with a pressure of 1.0 kg/cm2, peak 2 is 15 minutes with a pressure of 1.5 kg/cm2, and peak 3 is 65 minutes with pressure 3.1 kg/cm2. he best boiling based on the right boiling time to achieve the lowest oil losses is 90–100 minutes in one boiling cycle. If a boiling cycle of 90-100 minutes is carried out, the oil losses achieved are 0.78-0.98%. The longer the boiling process is under FFB overripe, the more oil comes out of the mesocarp and finally comes out mixed with condensate water.
Enhancing Reliability and Maintenance Efficiency of Screw Press Machines in Palm Fruitlet Processing Mills: A Failure Mode and Effect Analysis (FEMA) Approach Aditya, Abbiyu Bima; Nugroho, Bagus; Hermantoro, Hermantoro; Renjani, Rengga Arnalis
Tropical Plantation Journal Vol 4, No 2 (2025): TROPICAL PLANTATION JOURNAL
Publisher : Akademi Komunitas Perkebunan Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56125/tpj.v4i2.56

Abstract

This study analyzed the reliability and failure risks of screw press machine components in a palm oil loose fruit mill using the Failure Mode and Effect Analysis (FMEA) method. The objective was to identify critical components, evaluate their Risk Priority Number (RPN), and propose appropriate maintenance strategies. Data were collected through questionnaires, field observations, and maintenance records. The RPN was calculated by multiplying severity, occurrence, and detection scores, while reliability was assessed using the Mean Time Between Failures (MTBF) formula. The worm screw showed the highest RPN at 252, indicating a critical risk level, while the press cage followed with an RPN of 210. MTBF analysis revealed that the worm screw required replacement every 313.5 hours, whereas components like the V-belt and electro motor had longer MTBF intervals of up to 3135 hours. The findings suggested that targeted maintenance on high-risk components could reduce downtime and enhance production efficiency. This study concluded that prioritizing preventive maintenance based on RPN and MTBF results was crucial for maintaining the operational performance of screw press machines in palm oil processing.
Stability Evaluation of Palm Oil Mill Effluent Treatment in a Single Feeding Systems Through Temperature, VFA, and Alkalinity Monitoring: Evaluasi Stabilitas Sistem Pengolahan Limbah Cair Kelapa Sawit Single Feeding Melalui Pemantauan Suhu, VFA, dan Alkalinitas Renjani, Rengga Arnalis; Dwi Dharmawati, Nuraeni; Ramadhani, Sisca
Jurnal Pertanian Vol. 16 No. 2 (2025): OKTOBER
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/jp.v16i1.18851

Abstract

Palm Oil Mill Effluent (POME) is one of the most critical environmental concerns in the palm oil industry due to its high organic load and strongly acidic nature. Improper management of POME poses significant risks to aquatic ecosystems and soil quality. This study aimed to evaluate the biological stability of a single feeding POME treatment system by monitoring temperature, pH, volatile fatty acids (VFA), and total alkalinity (TA) across a 21-day observation period at each treatment pond. Parameters were measured sequentially from the effluent outlet to the final sedimentation pond. The results showed a gradual decrease in temperature from 63°C to 27–30°C, with a corresponding increase in pH from 4.23 to 7.86, indicating successful neutralization. VFA concentrations ranged from 458–474 mg/L, while TA remained within 2.40–2.57, resulting in a VFA/TA ratio consistently below 0.4. These values confirmed that the system operated under biologically stable conditions. The study concluded that monitoring these parameters offers a simple, cost-effective method for assessing the operational performance of open-lagoon POME treatment systems. Scientifically, this research contributes to the development of practical tools for real-time wastewater monitoring in agro-industrial applications. Environmentally, it supports safer and more sustainable land application of treated POME, reducing the risk of pollution and promoting better resource recovery practices.
Minimize Oil Losses in Palm Oil Mill through Optimalization of Sludge Separator Performance Fadhilah, Nabillah Nissya; Safitri, Lisma; Alfian, Ulil Albab; Dharmawati, Nuraeni Dwi; Renjani, Rengga Arnalis
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.123-131

Abstract

One of the most important clarification station engine parts for reducing oil loss is the sludge separator. The sludge separator uses high-speed centrifugal force to capture any oil that is still adhered to the sludge. This study aims to improve the working performance of sludge separator to minimize oil losses through variations in feeding rate, oil under flow and temperature of flow rate. The experiment was conducted at one of the palm oil mills in Central Kalimantan, with a capacity of 45 ton/h. Variations in sludge separator feed rates: 23, 25 and 27 tons/hour. Oil underflow variations: 5%, 6%, and 7%. Feed temperature variations are: 90°C, 93°C, and 95°C. Feed temperature variations:  90°C, 93°C, and 95°C. Based on research that has been done, using bait rate of 23 ton/h, temperature 90 °C, and oil underflows 5%, resulting in oil losses of 0.54% – 0.61%. This study has managed to lower oil losses in the sludge separator by 0.11 % and shows the level of stability below the standard that has been determined. Keywords:  Crude palm oil,  Oil losses,  Palm oil mill,  Sludge separator, Underflow
Co-Authors Aditya, Abbiyu Bima Alfian, Ulil Albab Candra Ginting Dharmawati, Nuraeni Dwi Dwi Dharmawati, Nuraeni Fadhilah, Nabillah Nissya Fadhillah, Nabillah Nissya Hermantoro, Hermantoro Nugroho, Bagus Panjaitan, Boy Doli Purwoto, Harsunu Ramadhani, Sisca Safitri, Lisma Widyowanti, Reni Astuti