Strategi Kendali Kadar Nitrat Berbasis Fuzzy-PID pada Proses Nitrogen Removal di Instalasi Pengolahan Air Limbah

Tingginya tingkat pencemaran air menyebabkan peningkatan kadar nitrogen pada eksosistem perairan, telah memicu terjadinya fenomena eutrofikasi yang berbahaya bagi ekosistem perairan. Instalasi pengolahan air limbah atau Wastewater Treatment Plant (WWTP) merupakan solusi pengendalian pencemaran air. Pengendalian kadar cemaran nitrogen pada instalasi pengolahan air limbah tergolong tidak mudah dikarenakan perilaku bakteri pada reaktor biologis yang sukar diprediksi. Pengujian strategi kendali kadar nitrogen dilakukan dengan menggunakan model BSM1(Benchmark Simulation Model no.1). Manipulasi laju sirkulasi internal digunakan untuk mengendalikan kadar nitrogen. Dengan mengimplementasikan pengendali nitrat berbasis Fuzzy-PID, didapatkan kualitas cemaran dengan kadar nitrogen dan ammonia lebih rendah dibandingkan dengan kendali PID konvensional. Kadar nitrogen dan ammonia berkurang sebesar 0.17 mg N/l (0.99%) dan 0.1 mg N/l (3.4%). Konsumsi energi listrik yang dibutuhkan instalasi pengolahan limbah selama 14 hari turun sebesar 193 kWh.The rising of water pollutant level leads to the rising of nitrogen level in water ecosystem. It triggers eutrophication phenomenon that harmful for water ecosystem. Wastewater treatment plant (WWTP) is the solution to resolve the water pollution problem. Controlling the nitrogen level is not an easy task, due unpredictable microorganism behavior in biological reactors. This research utilizes BSM1 simulator model to simulates the control strategy of nitrate level. The manipulation of internal recirculation is the method to control nitrogen level. The Fuzzy PID-based nitrate controller produces less nitrogen and ammonia than PID-based nitrate controller. The proposed control strategy succeeded in reducing nitrogen and ammonia level by 0.17 mg N/l (0.99%) and 0.1 mg N/l (3.4%).  The level of energy consumption also decreased by 193 kWh in 14 day