Latar Belakang: Limbah padat, cair, dan gas menyebabkan pencemaran lingkungan sehingga diperlukan suatu upaya pengolahan limbah agar tidak terjadi pencemaran lingkungan. Pencemaran lingkungan terjadi karena adanya pembuangan limbah yang melebihi Nilai Baku Mutu. Tujuan penelitian ini adalah menganalisis hasil proses pengolahan limbah cair sehingga dapat mencegah terjadinya pencemaran lingkungan.

Metode: Penelitian ini dilaksanakan dengan menggunakan metode deskriptif yang memberikan gambaran dan analisis proses pengolahan limbah cair. Pengambilan data mengenai proses dan analisa hasil pengolahan limbah cair dilakukan melalui observasi lapangan, wawancara, studi kepustakaan, serta dokumentasi dan di sesuaikan dengan baku mutu limbah cair berdasarkan Peraturan Menteri Lingkungan Hidup No 5 Tahun 2014.  

Hasil: Dalam penelitian ini hasil yang diperoleh adalah proses pengolahan limbah cair di unit Waste Water Treathment Plan (WWTP) di PT SMART Tbk ada 3 tahapan yaitu pengolahan fisika (Screening, Oil and Grease Trap, Sedimentation), pengolahan kimia (Equalisasi, Flokulasi-Koagulasi), pengolahan biologi (Proses Aerobik) dan hasilnya sudah sesuai dengan Peraturan Menteri Lingkungan Hidup No 5 Tahun 2014.

Simpulan: PT SMART Tbk Refinery Unit Marunda Tbk Perusahaan telah melaksanakan pengolahan limbah cair sesuai dengan baku mutu yang ada sehingga dapat mencegah terjadinya pencemaran lingkungan sesuai denganPeraturan Menteri Lingkungan Hidup No 5 Tahun 2014, diharapkan perusahaan memberikan pengawasan terhadap operator WWTP.

Kata Kunci: Pengolahan Limbah Cair, Upaya pencegahan pencemaran, Pemenuhan Baku Mutu Limbah Cair

Purpose: Solids, liquids, and gases causing environmental pollution so we need a waste management efforts to prevent environmental pollution. Environmental pollution occurs because of the disposal of waste that exceeds the value Quality Standard.This study purposed is to determine the processed water quality of the WWTP (Waste Water Treatment Plant) to prevent environmental pollution.

Methode: The method used  was conducted using descriptive method that provides an overview and analysis of the waste water treatment process. Data retrieval and analysis of the results of the process of waste water treatment is done through observation, interviews, literature study, and documentation.

Result: In this study, the results obtained are in the process of waste water treatmen plan (WWTP) in PT. SMART Tbk there are three stages namely physics processing (Screening, Oil and Grease Trap, sedimentation), chemical processing (equalization, Flocculation-Coagulation), biological treatment (Aerobic Process)

Conclution: PT. SMART Tbk Marunda Tbk Unit Refinery Company has been implementing waste water treatment in accordance with existing quality standards so as to prevent environmental pollution in accordance with Peraturan Lingkungan Hidup No. 5 of 2014 on Waste water Quality Standard Appendix Waste water Quality Standard For Business / Industrial Activity Cooking Oil dry.

Keywords: Waste Water Treatment, Prevent To Environmental Pollution, Waste Water Quality