Studi Pola Sebaran Air Bahang dan Perubahan Suhu Di Perairan Sekitar PLTU (Studi Kasus PLTU Tanjung Jati B unit 5 & 6)

Djazuli, Fajar Lemanza (2025) Studi Pola Sebaran Air Bahang dan Perubahan Suhu Di Perairan Sekitar PLTU (Studi Kasus PLTU Tanjung Jati B unit 5 & 6). Other thesis, Institut Teknoogi Sepuluh Nopember.

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Abstract

Air bahang merupakan limbah air panas yang berasal dari proses operasi PLTU (Pembangkit Listrik Tenaga Uap). Limbah air bahang umumnya akan dibuang kembali ke laut melalui ocean outfall. Proses pembuangan ini tentunya memberikan dampak terhadap lingkungan dan ekosistem yang hidup di sekitarnya. Salah satu dampak yang akan terjadi adalah kenaikan suhu air laut di sekitarnya. Sehingga pada penelitian ini dilakukan analisis terkait pola persebaran dan kenaikan suhu yang terjadi pada perairan di sekitar ocean outfall PLTU Tanjung Jati B unit 5 & 6.. Metode yang digunakan merupakan analisis numerik menggunakan software Delft 3D dengan dua modul yaitu Delft 3D FLOW dan WAVE untuk dilakukan pemodelan pola sebaran limbah air bahang, serta untuk mengetahui perubahan suhunya dengan beberapa variasi kondisi. Pola sebaran limbah air bahang yang didapat pada angin muson barat cenderung dominan mengarah ke timur laut, sedangkan pada angin muson timur arah sebaran limbah air bahang cenderung dominan mengarah ke barat, barat laut dan utara. Dari hasil tersebut arus laut dan gelombang laut memiliki pengaruh penting terhadap sebaran limbah air bahang. Selanjutnya untuk perubahan suhu limbah air bahang yang terjadi paling tinggi berada di 9 derajat celcius (9°C) dan rata rata luas area yang memiliki suhu (> 2°C) adalah 932,16 m2 pada angin muson barat dan 1.487,62 pada angin muson timur dengan kondisi pola sebaran 2024 dibandingkan suhu perairan 2015. Terdapat beberapa indikasi solusi yang dapat dilakukan untuk meminimalkan sebaran limbah air bahang, tetapi perlu kajian lebih lanjut terkait solusi tersebut.
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Sea cooling discharge refers to heated wastewater produced during the operational of a Steam Power Plant (PLTU). This effluent is typically discharged into the sea via an ocean outfall, a process that can significantly impact the surrounding marine environment and ecosystems. One of the primary consequences of this discharge is the elevation of seawater temperature in the vicinity of the outfall. This study aims to analyze the distribution patterns and temperature increases of seawater around the ocean outfall of Tanjung Jati B Power Plant Units 5 & 6. Numerical modeling was conducted using the Delft3D software, employing both the FLOW and WAVE modules to simulate the dispersion of thermal effluent and to assess temperature variations under different environmental conditions. The simulation results show that, during the west monsoon, the dispersion of thermal effluent predominantly extends toward the northeast, while during the east monsoon, the dispersion is mainly directed toward the west, northwest, and north. These findings underscore the significant influence of ocean currents and waves on the distribution of thermal effluent. Additionally, the maximum observed temperature increase of the thermal effluent reached 9°C, with the average area experiencing a temperature rise greater than 2°C measured at 932.16 m² during the west monsoon and 1,487.62 m² during the east monsoon, when comparing the 2024 dispersion pattern to the baseline seawater temperature in 2015. To mitigate the spread of thermal effluent, three alternative solutions are proposed (1) extending the outfall structure, (2) evaluating and optimizing the design of the existing outfall. There are several potential approaches to minimize the dispersal of thermal wastewater, but further study is required to evaluate the effectiveness of these solutions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Air Bahang, PLTU, Delft 3D, Sea cooling discharge, Steam Power Plant, Delft 3D
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD194.6 Environmental impact analysis T Technology > TD Environmental technology. Sanitary engineering > TD678 Ocean outfalls--Design and construction. T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction V Naval Science > V Naval Science (General)
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Fajar Lemanza Djazuli
Date Deposited:	18 Jul 2025 06:45
Last Modified:	18 Jul 2025 06:45
URI:	http://repository.its.ac.id/id/eprint/120060

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