Redesign Pengolahan Air Limbah Domestik Kantor Pusat Pertamina Menggunakan Integrated Fixed Film Activated Sludge

Abstract

Instalasi Pengolahan Air Limbah (IPAL) domestik Kantor Pusat PT Pertamina (Persero) mengalami kondisi underload akibat penurunan aktivitas gedung sehingga debit air limbah yang diolah lebih rendah dibandingkan kapasitas desain. Kondisi tersebut menyebabkan beban hidrolis dan beban pencemar yang masuk ke beberapa unit pengolahan sehingga proses pengolahan tidak berlangsung secara optimal. Penelitian ini bertujuan mengevaluasi kondisi eksisting IPAL domestik serta menyusun redesign sistem pengolahan menggunakan pendekatan Integrated Fixed Film Activated Sludge (IFAS) yang mengombinasikan pertumbuhan biomassa tersuspensi dan biomassa melekat untuk meningkatkan retensi biomassa. Penelitian dilakukan melalui observasi lapangan, pengumpulan data operasional, analisis kualitas air limbah, serta perhitungan desain berdasarkan debit aktual sebesar 18,6 m³/hari. Evaluasi dilakukan terhadap kondisi eksisting unit pengolahan, karakteristik air limbah, kapasitas unit, dan kesesuaian sistem terhadap kondisi underload sebagai dasar penyusunan redesign.

The domestic wastewater treatment plant (WWTP) at the Head Office of PT Pertamina (Persero) is experiencing an underload condition due to decreased building activity, resulting in a wastewater flow rate lower than the design capacity. This condition causes reduced hydraulic and pollutant loads entering several treatment units, resulting in suboptimal treatment performance. This study aims to evaluate the existing domestic WWTP and develop a redesign of the treatment system using the Integrated Fixed Film Activated Sludge (IFAS) approach, which combines suspended-growth and attached-growth biomass to increase biomass retention. The study was conducted through field observations, operational data collection, wastewater quality analysis, and design calculations based on an actual wastewater flow rate of 18.6 m³/day. The evaluation covered the existing treatment units, wastewater characteristics, unit capacities, and system suitability under underload conditions as the basis for the redesign.