http://repository.president.ac.id/xmlui/handle/123456789/12140 Tue, 21 Apr 2026 01:38:00 GMT 2026-04-21T01:38:00Z http://repository.president.ac.id/xmlui/handle/123456789/12143 STUDY OF STIRRING TIME EFFECT OF LIQUID HAND SOAP PROCESS MADE OF USED COOKING OIL (CASE STUDY USED COOKING OIL FROM BELAKANG I STREET, SIMPANGAN VILLAGE, BEKASI) Kurniawan, Sarah Nurhanifah The problem of waste in the environment is becoming a national problem. One of the wastes that pollute the environment is used cooking oil. In 2019, 13 million tons of used cooking oil in Indonesia amounted to 18.5% of the remaining cooking oil consumption. Disposal of used cooking oil waste can cause soil and water pollution. Prevention can be done by utilizing oil in a liquid hand soap. The study’s objective is to know the effect of stirring time on liquid hand soap manufacturing laboratory scale made of used cooking oil based on analysis of pH, total active materials, insoluble materials in ethanol, and free alkali. The research method of treatment and experiment was making liquid hand soap on a laboratory scale. The sample in this study was used cooking oil taken from Belakang I Street, Simpangan Village. The result and discussion showed that the hand soap product with a stirring time of 45 and 60 minutes had a showed that pH, free alkaline, and insoluble material in ethanol are significant difference and total active materials is insignificant difference using ANOVA: single factors in comparison stirring time 45 minutes and 60 minutes. The parameter is meet the quality standard but not comply using T-test of equals variance. Sun, 01 Jan 2023 00:00:00 GMT http://repository.president.ac.id/xmlui/handle/123456789/12143 2023-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/12142 A STUDY OF EMISSION INVENTORY OF CO2e IN MANUFACTURING PRINTING COMPANY (CASE STUDY: PT. XYZ) Saroba, Meigail Endrew As one of Indonesia's printing companies, PT XYZ strives to meet consumer demand by producing as many as they can. They consistently give us large quantities of completed goods each day along with huge emissions and trash. Looking at that situation, it is clear that the industrial process might have an effect on the environment.In light of this, the goal of this study is to determine and estimate the possible effects of emissions from the energy supply on the printing manufacturing process and environmental impact on land based on volatile organic compound materials.The method of measuring the amount of emissions is called emission inventory. ReCiPe 2016 is a method that will use to analyse the impact through manual calculation based on Green House Gases Protocol.Based on the above data it can be concluded that the total emissions produced by PT. XYZ in 2021 and 2022 are 1,616 tons of CO2e and 1,722 tons of CO2e based on electricity purchases paid annually by PT. XYZ. However, calculations from the emission inventory modeling carried out show that the total emissions produced by PT. XYZ in 2021 and 2022 is 1,405 tons of CO2e and 1,389 tons of CO2e. Keywords: Printing Process, Emission 1,389 tons of CO2e. Sun, 01 Jan 2023 00:00:00 GMT http://repository.president.ac.id/xmlui/handle/123456789/12142 2023-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/12141 STUDI EMISI KARBON DARI KENDARAAN BERMOTOR DAN DAYA SERAP KARBON DARI POHON DI PT KOMATSU UNDERCARRIAGE INDONESIA Hermansyah, Bambang Meningkatnya pengguna kendaraan bermotor berpengaruh terhadap udara yang ada disekitar kita sehingga udara menjadi tidak sehat. Gas CO2 hasil dari pembakaran kendaraan bermotor menyebabkan udara tercemar. Diperlukan pengendalian pencemaran udara untuk mengurangi emisi gas buang CO2 dengan memanfaatkan vegetasi disekitar lokasi tercemarnya udara dimana peran tumbuhan sangat besar dalam menyerap CO2. Penelitian ini bertujuan untuk mengetahui tingkat penyerapan karbon oleh tumbuhan disekitar area parkiran perusahaan di PT Komatsu Undercarriage Indonesia berlokasi di Cikarang terhadap emisi gas CO2. Untuk mencapai tujuan tersebut diperlukan perhitungan emisi CO2 dari sumber bergerak, pengukuran daya serap CO2 pada tumbuhan di area parkir perusahaan. Pengumpulan data dilakukan dengan pengambilan data pohon dan data kendaraan. Pengambilan data pohon dilakukan dengan metode perhitungan manual di area sekitar parkir perusahaan yang dibagi 3 area, yaitu Masjid Jami' KUI. Gedung Parkir KUI dan Lapangan KUI. Pohon pada 3 area tersebut diidentifikasi jenis dan diukur rata-rata diameternya agar serapan CO2 terukur. Pengumpulan data kendaraan dilakukan dengan menghitung jumlah kendaraan yang berada di area parkir. Hasil dari penelitian ini diharapkan dengan adanya Ruang Terbuka Hijau (RTH) di area parkir perusahaan ini dapat menyerap emisi gas karbon sehingga terwujud udara yang bersih, sehat dan bermanfaat untuk masyarakat khususnya perusahaan. Sun, 01 Jan 2023 00:00:00 GMT http://repository.president.ac.id/xmlui/handle/123456789/12141 2023-01-01T00:00:00Z