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All Journal Journal of Community Based Environmental Engineering and Management Indonesian Journal of Industrial Engineering & Management Envirous
Ningrum, Dwi Mulyati
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Environmental Science Industrial & Manufacturing Engineering Public Health Other

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Utilization of Siwalan Waste (Borassus flabellifer L.) as a Prototype of Active Carbon-Based Batteries Using Brunauer Emmett Teller (BET) and Analysis of Variance (ANOVA) Method Nugraha, Isna; Anshori, Husna Zaka; Arier, Tivani Nava; Aliya, Izra Noor; Ningrum, Dwi Mulyati; Gufron, Achmad
IJIEM - Indonesian Journal of Industrial Engineering and Management Vol 5, No 3: October 2024
Publisher : Program Pascasarjana Magister Teknik Industri Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijiem.v5i3.23892

Abstract

Currently, electricity use in Indonesia has soared and continues to increase every year. New renewable energy will be the main alternative for the country as a source of electricity. Alternative energy sources can come from biomass such as Siwalan shell waste. This waste has a composition of 18.52% hemicellulose, 11.90% cellulose, 0.23% lignin, 0.1% nitrogen, 13.80% water, 4.46% ash, 44.58% carbon and 6.41% volatile matter. % which is the chemical component of the basic ingredient for making activated carbon. Thus, the aim of this research is to determine the capacitance of a battery prototype from activated carbon from Siwalan shell waste. The method used is a quantitative method by taking data from the results of the Brunauer Emmett Teller test and the Cyclic Voltammetry test. Carbon is activated using KOH with varying concentrations of 1 M; 1.5 M; 2M; 2.5 M. The results of the surface area of activated carbon in the BET test were 13,636 m2/g; 20,941 m2/g; 28,191 m2/g; and 29,871 m2/g and in manual calculations using the BET method it was obtained 13,647 m2/g; 20,950 m2/g; 28,197 m2/g; and 29,875 m2/g. From testing and manual calculations, Siwalan shell carbon at a KOH concentration of 2.5 M has the largest surface area and has the potential to be the best active carbon material for making battery prototypes.
Pengaruh Kegiatan Pembangkit Listrik Tenaga Gas dan Uap PT X Terhadap Emisi Gas SO2 dan NOx Mukharomah, Nur Laili Alfiatin; Ningrum, Dwi Mulyati; Claudya, Agnes Lidya
Envirous Vol. 5 No. 2 (2025): Jurnal Envirous
Publisher : UPN "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/envirous.v5i2.346

Abstract

Climate change is a global phenomenon that triggers social and ecological crises. Indonesia has committed to the Sustainable Development Goals (SDGs) to reduce greenhouse gas (GHG) emissions as stated in the Nationally Determined Contribution (NDC). The NDC targets lowering emissions by 41% by 2030 with independent efforts and international assistance. This study aims to analyze SO2 and NOx emissions from the Gas and Steam Power Plant (PLTGU) at X Company, with reference to the applicable air quality standards, namely the Regulation of the Director General of Pollution Control and Environmental Damage Number P.17/PPKL/PPU/KUM.1/10/2022. The methods used in the analysis process are USEPA Method 6C: 2017 in determining Sulfur Dioxide (SO2) gas and USEPA Method 7E: 2020 in determining Nitrogen Oxide (NOx) gas. Field measurements were conducted at several sampling points in HRSG Blocks II.1, II.2, and II.3. The analysis results show that the SO2 and NOx emission concentrations are still below the maximum permissible limits with the highest SO2 and NOx emission concentrations of 291 Mg/Nm³ and 6 Mg/Nm³, respectively
Effectiveness of the Combination of Moving Bed Biofilm Reactor, Adsorption and Fenton Oxidation to Reduce Batik Waste Water Pollution Ningrum, Dwi Mulyati; Hendrasarie, Novirina
Journal of Community Based Environmental Engineering and Management Vol. 9 No. 2 (2025): September 2025
Publisher : Department of Environmental Engineering - Universitas Pasundan - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jcbeem.v9i2.31216

Abstract

Batik wastewater has a high organic and color content, requiring special treatment to meet environmental quality standards. This wastewater has an initial BOD5 of 605.405 mg/L, COD 714 mg/L, TSS 360 mg/L, and Pt-Co color of 992.2, far exceeding the quality standards. This study aimed to determine the effectiveness of a Moving Bed Biofilm Reactor (MBBR) combination with rice husk geopolymer-based adsorption and Fenton oxidation post-treatment in removing pollutants from Sidoarjo batik wastewater. Variations in HRT, adsorbent mass, MBBR media type, and chemical ratio were the independent variables in this study. The results showed that the MBBR-adsorption treatment unit performed better than the MBBR without adsorption. The MBBR-adsorption unit with wood charcoal media, HRT 48 hours, and adsorbent mass 20 grams were the most optimal conditions for reducing COD and BOD5, with removal values of 93.6% and 95.8%, respectively. Meanwhile, the most optimal color and TSS removal was achieved with a 48-hour HRT MBBR adsorption, Kaldness K3 media, and 20 grams of adsorbent mass, with values of 90.3% and 94.4%, respectively. The addition of the Fenton process after the MBBR adsorption process increased the efficiency of TSS and color removal, with a FeSO₂:H₂O₂ ratio of 1:3, resulting in a 50% increase in TSS and 52.2% increase in color removal.
Co-Authors Aliya, Izra Noor Anshori, Husna Zaka Arier, Tivani Nava Claudya, Agnes Lidya Gufron, Achmad Hendrasarie, Novirina Mukharomah, Nur Laili Alfiatin Nugraha, Isna