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Ni'mah, Lailan
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Engineering

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STUDY KINETIKA PERURAIAN PARTIKEL PADA PEMANFAATAN LIMBAH AMPAS TAHU DAN KOTORAN SAPI SEBAGAI MATERIAL PEMBUATAN BIOGAS Ni'mah, Lailan
INFO-TEKNIK Vol 15, No 1 (2014): INFOTEKNIK VOL. 15 NO. 1 2014
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v15i1.231

Abstract

The increasing energy demand and the depletion of fossil fuel reserves caused the waterwheel crisis, it is necessary for innovation to generate alternative energy sources. One of the alternative energy is biogas which can be produced from solid waste of tofu production (SWTP). Utilization of solid waste of tofu production (SWTP) to produce biogas can reduce energy consumption from fossil fuels while reducing the accumulation of garbage because so far most of the solid waste of tofu production (SWTP) directly discharged into the environment. Biogas is produced through a process that involves the breakdown of organic material activity of anaerobic microorganisms are bacteria methanogens in a anaerobic reactor (biodigester). Tofu production waste has high acidity so that it needs a buffer in biogas production. One of the buffer which can be utilized is cow manure.The experiment as many as 800 ml of sample was  entered to the reactor with the capacity of 1 L, then incubated in an anaerobic condition in the room at the temperature of 25-30oC within 30 days. There are 8 variation apply in this research, they are KS:KT=100:0,75:25, 50:50,25:75 and 0:100 at VS of 3%, and KS:AT 50:50 at VS of 2%,4% and 5%. The measured parameter is the biogas volume, methane concentration, carbon dioxide concentration, the ratio of C vs N, total solid (TS) and volatile solid content (VS), volatile fatty acid (VFA),pH and temperature. The gas volume measurement was done every day using gasholder while methane concentration was measured by gas chromatography (GC).The experiment result shows that the composition of cow manure and SWTP at VS of 3% KS:AT = 50:50 shows the highest methane concentration compared to the other compositions. The mathematic model as first order of reaction rate equation can approach the experiment result. Keywords:solid waste of tofu production, cow manure, biogas, and biogas's production model.
One-stage microwave-assisted activated carbon preparation from Langsat peel raw material for adsorption of iron, manganese and copper from acid mining waste Ni'mah, Lailan; Juliastuti, Sri Rachmania; Mahfud, Mahfud
Communications in Science and Technology Vol 8 No 2 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.2.2023.1299

Abstract

This study describes the efficacy of microwave technology for the preparation of an activated carbon from Lansium domesticum peel as an adsorbent to adsorb Fe, Cu, and Mn from acid mine waste. In contrast to the conventional pyrolytic carbonization technique, the described method demonstrated several unparalleled advantages, including superior energy efficiency and remarkably rapid processing. The reported microwave irradiation method was able readily to achieve a morphology and extensive surface area similar to that of a sample produced using the traditional pyrolytic carbonization method for 2 hours, and this was accomplished in just 10 minutes. The activated carbon obtained was characterized using SEM-EDX, BET-BJH, and proximate test and applied to adsorb metal ions from acid mine waste to evaluate the isothermal adsorption model. The best power for activated carbon production was 400 watts for 10 minutes, which met the requirements of ASTM D 4607 for determining the iodine value of activated carbon. Optimal mass for adsorbing Fe, Cu, and Mn from acid mine waste was 4 grams with the removal percentages of 94.08%, 83.69%, and 90.67%, respectively. BET surface area was 1367.0385 m2/g along with a BJH cumulative volume and an average pore diameter of 1.112 cm3/g and 2.25 nm, respectively. This suggests that it possesses mesoporous characteristics and adheres to the Langmuir model during the adsorption process, signifying monolayer adsorption. Meanwhile, kinetics followed the pseudo-second-order rate equation.
Co-Authors Mahfud Mahfud Sri Rachmania Juliastuti, Sri Rachmania