Perbandingan Pengolahan Senyawa Amonia dan nitrat Pada Air Danau Mahoni dengan Menggunakan Sistem Aerasi Tipe Diffuser dan Sistem Flaoting Wetland Skala Pilot Plant = Comparison of the Processing of Ammonia and Nitrate Compounds on Lake Mahoni Water Using Diffuser Type Aeration System and Floating Wetland System Pilot Plant Scale