Beban Pencemar Dan Kapasitas Asimilasi Amonium dan Nitrat Saat Pucak Musim Barat di Teluk Jakarta

Abstract

Jakarta Bay is a bay that has an important role in Jakarta, but the activity in this area lead to the potential for pollution mainly ammonium and nitrate. Pollution peaks generally occur during the rainy season (west monsoon). Pollution that enters the bay can be neutralized naturally by water as long as the amount does not exceed the asimilation capacity. This study aims to calculate the total input (load), assimilation capacity, and residence time of ammonium and nitrate in Jakarta Bay in the rainy season. Data from this study is derived from secondary data. For the total input of pollutants are calculated from the input stream, the atmosphere and the boundary. From the research found that the Jakarta Bay had a total load of pollutants NH₄ at 115.8 x 10⁹ mmol N/month and NO₃ 46.5 x 10⁹ mmol N/month. The biggest contributor to the pollution comes from the boundary NH₄ is 56.9% and NO₃ from the river 70.1%. Load from Citarum river for NH4 around 3.8 x 10¹⁰ mmol N/month and NO₃ around 3.0 x 10¹⁰ mmol N/month higher than Marunda, Priok and Angke the rivers. Assimilation capacity of Jakarta bay  for NH4 around 25.7 x 10⁹ mmol N/month and NO3 of 24.1 x 10⁹ mmol N/month. It shows the total load of pollutants entering the Jakarta Bay is greater than the assimilation capacity. The residence time of water in the Bay of Jakarta is 13.3 days longer than the residence time of NH₄ and NO₃ which were only 8.6 and 9.2 days.