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All Journal MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Jurnal Teknologi Kimia Unimal PERFECT: Journal of Smart Algorithms
Asyifa, Salwa
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science

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STRATEGI BIOPRODUKSI BERKELANJUTAN DARI LIMBAH PERTANIAN: INTEGRASI KONSEP CIRCULAR ECONOMY UNTUK MINIMASI EMISI DAN NILAI TAMBAH TINGGI Asyifa, Salwa
Jurnal Teknologi Kimia Unimal Vol. 14 No. 1 (2025): Jurnal Teknologi Kimia Unimal - May 2025
Publisher : Chemical Engineering Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v14i1.21667

Abstract

Limbah pertanian lignoselulosa seperti sekam padi, jerami, tandan kosong kelapa sawit (TKKS), dan bagasse tebu berpotensi besar sebagai sumber bahan baku bioenergi dan bioproduk bernilai. Kajian ini membahas strategi bioproduksi berkelanjutan melalui pendekatan circular economy yang mengintegrasikan teknologi pretreatment, konversi biologis, dan termokimia dalam model biorefinery zero-waste. Hasil analisis menunjukkan bahwa kombinasi teknologi seperti Steam Explosion, fermentasi mikroba, pirolisis, dan gasifikasi mampu mengonversi seluruh fraksi biomassa menjadi bioetanol, biohidrogen, biochar, dan bahan kimia terbarukan dengan efisiensi tinggi dan emisi rendah. Life Cycle Assessment (LCA) memperkuat temuan ini dengan menunjukkan pengurangan signifikan dalam jejak karbon dan konsumsi energi. Meskipun terdapat tantangan teknis dan kebijakan, inovasi dalam rekayasa enzimatik serta dukungan regulasi lintas sektor dapat mempercepat penerapan skala industri. Dengan strategi yang tepat, Indonesia berpotensi menjadi pelopor bioekonomi sirkular berbasis limbah pertanian.
Serial Rectifier Antenna (Rectenna) Circular Microstrip Patch 2.4 GHz for RF Energy Harvesting Asyifa, Salwa; Pharmayeni, Pharmayeni
PERFECT: Journal of Smart Algorithms Vol. 2 No. 1 (2025): PERFECT: Journal of Smart Algorithms, Article Research January 2025
Publisher : LEMBAGA KAJIAN PEMBANGUNAN PERTANIAN DAN LINGKUNGAN (LKPPL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/perfect.v2i1.70

Abstract

The rapid development of Radio Frequency (RF) usage at this time causes the abundance and waste of radio frequency (RF) electromagnetic wave energy sources in the air. This RF energy source can be used as an environmentally friendly alternative by harvesting energy using the rectenna system . The rectifier antenna (rectenna) system is designed using the serial rectenna system , this system is used to improve the performance of the rectenna in converting electromagnetic waves into a direct voltage (DC) source. To design a serial rectenna system, use 3 antennas and 3 series of rectifiers . The antenna used in the serial rectenna system is a 2.4 GHz circular microstrip patch antenna for WiFi signal reception. Meanwhile, the rectifier circuit uses a 6-stage voltage doubler using a Schottky 2860 diode and a 1nF smd capacitor. From testing and measuring the serial rectenna system , the circular patch microstrip antenna is able to capture and rectify the voltage to DC. Antenna system has return loss values of -26.29 dB, -21.75 dB, and -28.57dB, VSWR 1.11, 1.16, and 1.07, impedances 51.1, 55.56, and 50.22, bandwidth 60 MHz, 60 MHz and 50 MHz with resonant frequency 2.42 GHz, 2.36 GHz and 2.48 GHz. So that the voltage generated by a single rectenna system is 51.3 mV at a distance of 25 cm. Meanwhile, the rectenna serial system can convert direct voltage of 151.3 mV at a distance of 25 cm from the source of the Access Point transmitter.
Evaluation of the Stability of the Anaerobic Digestion Process of POME Based on the Correlation of VFA, Alkalinity and Methane Content Sahaq, Anang Baharuddin; Yahya, Agung Kurnia; Permadani, Resi Levi; Asyifa, Salwa; Alfiana, Aulia Firda
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 8 No 1 (2026): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v8i1.529

Abstract

Palm Oil Mill Effluent (POME) contains a high organic load and requires effective treatment to prevent environmental pollution while enabling energy recovery. Anaerobic digestion is widely applied for POME treatment due to its ability to reduce organic pollutants and produce methane-rich biogas; however, its performance is highly dependent on process stability. This study aims to evaluate the stability of the anaerobic digestion process of POME through correlation analysis among volatile fatty acids (VFA), total alkalinity (TA), suspended solids (SS), and methane content (CH₄) using field operational data. The study was conducted at an industrial-scale biogas plant treating POME, where slurry samples were collected periodically from multiple biodigester units representing different digestion stages. VFA and TA were analyzed using acid–base titration, SS by gravimetric method, and methane content using a gas analyzer. The results show that the anaerobic digestion process operated under stable mesophilic conditions (35 ± 2 °C) with reactor pH maintained in the optimal range of 6.8–7.5. VFA concentrations remained relatively low (approximately 480–510 mg/L), supported by sufficient alkalinity (about 5,600 mg/L as CaCO₃), resulting in a low VFA/TA ratio (~0.09), indicating stable process conditions. A significant reduction in COD from approximately 41,700 ppm in the influent to about 7,200 ppm in the effluent was achieved, corresponding to a COD removal efficiency of 83%. Methane content in the biogas remained stable at ≥55%, supporting effective energy utilization without flaring. These results demonstrate that maintaining a balanced relationship among VFA, alkalinity, suspended solids, and operating conditions is essential for ensuring stable anaerobic digestion and consistent biogas quality in industrial-scale POME treatment systems.
Co-Authors Alfiana, Aulia Firda Permadani, Resi Levi Pharmayeni Pharmayeni Sahaq, Anang Baharuddin Yahya, Agung Kurnia