Article Per Year (5 Year)
p-Index From 2021 - 2026
0.61
P-Index
This Author published in this journals
All Journal Walisongo Journal of Chemistry Jurnal Sains dan Teknologi SAINTI: Majalah Ilmiah Teknologi Industri
NH, Harmiwati
Unknown Affiliation
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Production of Biogas with Two-Stage Fermentation of Cow Dung-Palm Oil Mill Effluent NH, Harmiwati; Supriadi, Eko; Rahmad, Dedy; Akbar, Addin; Khairati, Miftahul; Amrin, M. Zhafran Zharif; Adi, Tegar Trikora; Suhardito, Ibnu; Hidayat, Salsabila Alifia; Phuong, Nguyen Thi Thanh
Walisongo Journal of Chemistry Vol 6, No 1 (2023): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v6i1.13541

Abstract

In this research, biogas is produced from Palm Oil Mill Effluent (POME) by fermentation of cow dung using a stirred reactor and purified by various CO2 and H2S removal techniques. The variables in this study were: composition of cow dung (55%, 60%, 65%, 70%, 75%, 80% w/w), amino acid composition (0.5%, 1%, 1.5% w/w) and length of fermentation time (2, 6, 10, 14, 16 days). The fixed variables were stirring speed (100 rpm), temperature (30oC) and reactor volume (100 L). This research also investigated the effect of using a lime packed reactor on the purity of methane gas. From the results of first stage of fermentation, it was found that the optimum composition of cow dung-POME was at 60% and the fermentation time was 14 days. In the second stage of fermentation using optimum results at first stage compared to fermentation of cow dung without POME, the results of measuring the gas pressure produced in 60% cow dung-POME fermentation were 17.5 Psig greater than fermentation of cow dung without POME of 15 Psig.
Rancang Bangun Prototype Pencetak Biobriket dengan Sistem Hidrolik Putri, Intan Dwi; Maharani, Sania Azizah; NH, Harmiwati; Nirmala, Dyah
Jurnal Sains dan Teknologi (JSIT) Vol. 5 No. 1 (2025): Januari-april
Publisher : CV. Information Technology Training Center - Indonesia (ITTC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jsit.v5i1.2610

Abstract

Briquettes are an alternative biomass-based fuel with the potential to reduce fossil fuel consumption. This study aims to design and develop a hydraulic system-based briquette press prototype to improve production efficiency and briquette quality. The hydraulic system was chosen for its ability to provide uniform pressure, resulting in briquettes with consistent dimensions and density. The construction process utilized materials such as galvanized hollow steel, angle iron, and hydraulic jacks. The press design includes 35 cubic molds with dimensions of 3x3x3 cm. This study evaluated the performance of the device in producing briquettes from sawdust charcoal using varying adhesive ratios and drying times. The results showed that the average briquette density reached 0.8 g/cm³, meeting international standards (0.46–1.2 g/cm³). The optimal ratio of charcoal to adhesive was 1.5:1, with an optimal drying time of 4 hours, producing high-quality briquettes with moisture content, volatile matter, and ash content meeting SNI standards. Compression strength tests also demonstrated adequate values, conforming to BNJ 01-6235-2000 standards.This briquette press has proven effective in producing high-quality briquettes, making it a promising innovation to support the production of environmentally friendly alternative fuels.
MODIFIKASI ALAT PENGEMPA BIOBRIKET DENGAN MONITORING TEKANAN REAL TIME BERBASIS IOT Rahmawati, Annisa; Supriadi, Eko; NH, Harmiwati
SAINTI: Majalah Ilmiah Teknologi Industri Vol. 22 No. 2 (2025)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/sainti.v22i2.3

Abstract

Salah satu energi alternatif yang potensial untuk dikembangkan adalah biobriket. Biobriket merupakan bahan bakar padat berbasis biomassa yang dibuat dari limbah organik seperti serbuk kayu, sekam padi, dan limbah pertanian. Pemanfaatan biobriket tidak hanya mengurangi ketergantungan pada bahan bakar fosil, tetapi juga menjadi solusi pengelolaan limbah dan pengurangan emisi gas rumah kaca. Pada penelitian ini akan dicetak biobriket menggunakan modifikasi peralatan pengempa menggunakan monitoring tekanan operasi secara real time berbasis IoT (Internet of Things). Sensor tekanan yang dipasang pada sistem hidrolik diharapkan dapat membaca tekanan aktual secara tepat dan detail. Dengan demikian proses dapat dijaga dengan konstan dan diharapkan mampu meningkatkan konsistensi kualitas biobriket dari segi densitas, kadar air, volatile matter, dan nilai kalor, sekaligus mempercepat proses produksi. Dari penelitian yang dilakukan didapatkan tekanan optimal untuk pengempaan biobriket dengan bahan baku tempurung kelapa yaitu pada 80 Psia dengan komposisi perekat 5% didapatkan densitas sebesar 0,79 g/cm³. Dengan kondisi perekat optimum 5%, tekanan optimum 80 psia dan ukuran partikel 100 mesh didapatkan kualitas biobriket dengan kadar air 6,91 %, denistas 0,63 g/cm³, kadar abu 12%, volatil matter 15% dan fixed carbon pada 66,09 % memenuhi SNI 01-6235-2000.
Co-Authors Addin Akbar Adi, Tegar Trikora Amrin, M. Zhafran Zharif Annisa Rahmawati Dyah Nirmala, Dyah Eko Supriadi Hidayat, Salsabila Alifia Khairati, Miftahul Maharani, Sania Azizah Phuong, Nguyen Thi Thanh Putri, Intan Dwi Rahmad, Dedy Suhardito, Ibnu Supriadi, Eko