Studi Evaluasi Rancangan Ocean Outfall Produced Water dari Floating Production Storage and Offloading

Christi, Priska Deviani (2023) Studi Evaluasi Rancangan Ocean Outfall Produced Water dari Floating Production Storage and Offloading. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Limbah cair merupakan jenis limbah terbesar yang dihasilkan dari produksi minyak dan gas bumi. Salah satu limbah cair adalah produced water atau Air terproduksi yang merupakan air yang terekstraksi dari dasar laut bersamaan dengan minyak dan gas selama pengeboran dan produksi sumur minyak dan gas. Pembuangan air terproduksi adalah praktik umum di industri minyak dan gas, yang diketahui dapat memiliki efek merugikan terhadap lingkungan. Penulis melakukan analisis terhadap pola penyebaran kandungan minyak dan lemak produced water FPSO Inpex Masela dari ocean outfall, memprediksi dampak penyebarannya terhadap daerah sensitif yang berada di sekitar area kegiatan dan menemukan alternatif outfall FPSO berdasarkan variasi kedalamannya dengan pemodelan numerik pada kondisi arus minimum dan maksimum. Didapatkan pada kedua kondisi arus, konsentrasi minyak dan lemak sudah memenuhi baku mutu air laut (kurang dari 1 mg/L) sebelum efluen menyentuh permukaan, dengan konsentrasi akhir pada near-field sebesar 0,62 mg/L pada arus minimum 0,1 m/s dan 0,05 mg/L pada arus maksimum 1 m/s. Penyebaran minyak dan lemak diprediksi hanya akan terbawa sejauh 10 hingga 11 km pada kondisi arus maksimum dengan konsentrasi 0,34 × 10−3 mg/L, sehingga tidak mencemari zona perikanan masyarakat Pulau Selaru dan Kawasan Strategis Nasional yang berada sejauh 80 km dari titik pembuangan. Kedalaman port outfall sebesar 9 m merupakan kedalaman yang paling efisien karena dapat mendilusikan efluen dengan baik dan menurunkan konsentrasinya mencapai baku mutu sebelum mencapai permukaan air laut, dan dengan jarak horizontal dari port yang sama dengan kedalaman asli port outfall sebesar 12 m. Dengan efektivitas yang sama, perusahaan dapat menghemat biaya dengan menggunakan outfall yang lebih pendek.
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Liquid waste is the largest type of waste generated from oil and gas production. One form of liquid waste is produced water, which is water extracted from the seabed along with oil and gas during drilling and production of oil and gas wells. The disposal of produced water is a common practice in the oil and gas industry, known to have detrimental effects on the environment. The author conducted an analysis of the oil and fat content dispersion pattern of the produced water from the FPSO through an ocean outfall, predicting its impact on sensitive areas surrounding the activity area, and explored alternative outfall depth for the FPSO using numerical modeling under minimum and maximum flow conditions. Under both flow conditions, the oil and fat concentrations met seawater quality standards (less than 1 mg/L) before reaching the surface, with final near-field concentrations of 0.62 mg/L at a minimum flow rate of 0.1 m/s and 0.05 mg/L at a maximum flow rate of 1 m/s. The dispersion of oil and fat was predicted to reach a distance of only 10 to 11 km under maximum flow conditions, with a concentration of 0,34 × 10−3 mg/L, thus avoiding contamination of the fishing zone for the Pulau Selaru community and the National Strategic Area, located 80 km away from the disposal point. A port outfall depth of 9 meters was found to be the most efficient as it effectively diluted the effluent and reduced its concentration to meet quality standards before reaching the seawater surface. This depth provided the same effectiveness as the original 12-meter port outfall while allowing the company to save costs by using a shorter outfall.

Item Type: Thesis (Other)
Uncontrolled Keywords: Outfall, Dilusi, Air Terproduksi, Minyak dan Lemak
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TD Environmental technology. Sanitary engineering > TD194.6 Environmental impact analysis
T Technology > TD Environmental technology. Sanitary engineering > TD195.S47 Sewage disposal plants--Environmental aspects
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Priska Deviani Christi
Date Deposited: 24 Jul 2023 01:21
Last Modified: 24 Jul 2023 01:21
URI: http://repository.its.ac.id/id/eprint/98975

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