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Hernani Yulinawati
Universitas Trisakti
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Analisis Logam Berat Timbel (Pb) di Low Emission Zone Kawasan Kota Tua Jakarta Aninda Dian Lestari; Hernani Yulinawati; Endro Suswantoro
Jurnal Serambi Engineering Vol 8, No 1 (2023): Januari 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i1.5555

Abstract

AbstractIn an effort to improve air quality, the DKI Jakarta Provincial Government has implemented a Low Emission Zone (LEZ) in Kawasan Kota Tua Jakarta since 2021. Only pedestrians, bicycles, public transport, and specially marked vehicles can cross LEZ. The purpose of this study is to analyze the concentration of Pb in Kawasan Kota Tua Jakarta based on Ambient Air Quality Standard (BMUA). The research method used in this study is descriptive quantitative. Samples were taken using a portable High Volume Air Sampler and analyzed using Atomic Absorption Spectrophotometry Flame. Sampling was carried out on March 25–May 15, 2022 (7 days) during the morning, afternoon, and evening at 4 points, UPK Kota Tua (UPK), Jakarta History Museum (MSJ), Kota Tua Entrance (PMK) and Jakarta Kota Station (SJK) so that 84 samples were collected. The results showed that the Pb concentration was higher than BMUA PP 22/2021 (2µg/Nm3 for a 24-hour period) in PMK 4,343µg/Nm3 (Friday), SJK 2,080µg/Nm3 (Wednesday), and at every sampling point (2,055–3,094µg/Nm3) on Saturday-Sunday. In conclusion, there are Pb concentrations that have passed the BMUA at certain locations and days. The average concentration of Pb in locations outside the LEZ tends to be higher than in the LEZ locations. Keywords: ambien air, Kawasan Kota Tua Jakarta, low emission zone, high volume air sampler, atomic absorption spectrophotometry flame, lead.
Simulasi Pemilihan Pengelolaan Stillage sebagai Produk Samping Industri Etanol dari Bahan Baku Tetes Tebu dengan Metoda Pohon Keputusan I Made Indradjaja Brunner; Hernani Yulinawati
Jurnal Serambi Engineering Vol 8, No 1 (2023): Januari 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i1.5292

Abstract

Stillage merupakan produk samping dari proses distilasi pada industri pembuatan etanol. Bahan baku etanol dapat berasal dari proses fermentasi tetes tebu yang telah dicampur dengan ragi dan bahan penolong lain. Tetes tebu merupakan hasil samping dari pemurnian gula tebu pada industri gula. Pemanfaatan produk samping proses industri merupakan suatu upaya untuk mengurangi buangan ke lingkungan serta memberi nilai tambah dengan memproduksi hasil yang lebih bernilai ekonomi. Namun demikian, stillage apabila terbuang ke badan air permukaan dapat membahayakan kehidupan biota perairan. Hal ini dikarenakan stillage memiliki kandungan organik yang tinggi dengan kadar Kebutuhan Oksigen Kimiawi dapat mencapai 90.000 mg/L. Stillage juga mengandung kalium, fosfor dan sulfat yang dapat dimanfaatkan sebagai pupuk alternatif pada perkebunan tebu. Artikel ini mendiskusikan altenatif pengelolaan stillage pada industri etanol. Alternatif pengelolaan yang disajikan merupakan hasil temuan nyata di lapangan, namun angka-angka yang digunakan dalam analisis merupakan nilai asumsi. Simulasi pemilihan dilakukan dengan menggunakan perhitungan Net Present Value (NPV) yang dipadukan dengan model Pohon Keputusan, serta dilanjutkan dengan uji sensitivitas model Pohon Keputusan. Hasil analisis menunjukkan bahwa alternatif terpilih dengan menggunakan perhitungan NPV dapat dipertajam dengan memasukkan beberapa kemungkinan kejadian yang mempengaruhi pelaksanaan alternatif pengelolaan. Selanjutnya, penggunaan uji sensitivitas dapat memberikan gambaran bagi pengambil keputusan terkait potensi risiko dari setiap alternatif pengelolaan.
Maximum Hourly and Daily Concentration Patterns of Urban Jakarta Tropospheric Ozone Hernani Yulinawati; I Made Indradjaja M Brunner
Jurnal Serambi Engineering Vol. 9 No. 1 (2024): Januari 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Tropospheric ozone is formed through UV radiation from sunlight with NOx and VOC precursors. Continuous O3 measurement data were obtained from US Embassy in Central Jakarta from November 4 2022 to September 30, 2023. The data were analyzed and compared with Indonesian NAAQS for 1-hour and 8-hour. Based on NAAQS, 1-hour O3 concentration is measured between 11:00-14:00; The 8-hour concentration is the average of the 8 hours measurements between 06:00-18:00. Based on the analysis, maximum concentration tends to occur between 11:00-16:00. The 1-hour concentration increased in July-September 2023, while maximum of 103 μg /m3 was recorded on November 4, 2022 at 14:00-15:00. Based on the recorded data, the 8-hour concentration can be calculated as the average of 8 hours concentration between 06:00 to 21:00. The measurement between 10:00-18:00 shows higher average 8-hour ozone concentration compared to other ranges. Lowest value was obtained in between 06:00-14:00. With additional O3 concentration data is expected Jakarta air quality can be more understood. With fast application of Low-Cost Sensor (LCS) for PM2.5, LCS for O3 can be considered to support limited number of AQMS in Jakarta. More O3 measurements needed since this parameter is strongly influenced by local meteorological conditions, contributing NOx and VOC pollutants activities, as well wind movement pattern.
Analisis Emisi dari Pembakaran Bahan Bakar Gas dengan Pendekatan Perhitungan Stoikiometrik I Made Indradjaja M. Brunner; Hernani Yulinawati
Jurnal Serambi Engineering Vol. 9 No. 3 (2024): Juli 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This article explains the analysis of potential emissions from the combustion of gaseous fuels, namely natural gas, coke oven gas (COG) and blast furnace gas (BFG). Fossil gas fuels are widely used in industrial activities, particularly in the integrated iron and steel industry. Natural gas is generally derived from natural sources and contains mainly methane gas in addition to longer chain hydrocarbon gases and other non-hydrocarbon gas compounds. COG is a by-product of the production of coke from coal and generally contains hydrogen and methane gas. BFG is the flue gas from the process of smelting iron ore in a furnace and consists of a mixture of nitrogen, carbon monoxide, carbon dioxide and hydrogen gas. Theoretical analysis shows that for an energy level equivalent to natural gas, approximately 2.35 times more COG and 11.56 times more BFG are required than natural gas. COG emissions tend to be lower in CO2 but higher in NO2 and SO2 than natural gas emissions. CO2 and NO2 gas emissions from COG are lower than those from BFG. However, CO2 and NO2 gas emissions from BFG are much higher than those from natural gas.
Co-Authors Albert Marcello Anggie Trixy Aninda Dian Lestari Arini Prasetyani Astari Minarti Bambang Iswanto Bambang Iswanto Endro Suswantoro I Made Indradjaja Brunner I Made Indradjaja M Brunner I Made Indradjaja M. Brunner Jannes Siahaan Kris Pudyastuti Lailatus Siami Pramiati P Riatno Pramiati Purwaningrum, Pramiati Ramadhani Yanidar Ratih Nurruhliati Ridho Aji Wicaksono RL Pangaribowo Silia Yuslim Tazkiaturrizki Winarni Winarni Yolanda Thasya Jocelin