Lahan Basah Terapung atau Floating Treatment Wetlands (FTWs) merupakan salah satu alternatif pengolahan limbah secara alamiah untuk mengurangi kadar polutan pada suatu badan air dengan memanfaatkan akar tanaman sebagai penyerap polutan tersebut. Penelitian ini bertujuan untuk mengetahui efisiensi penyisihan konsentrasi nutrien nitrogen, antara lain ammonia, nitrat, dan total nitrogen (TN), di dalam limbah cair artifisial NPK menggunakan sistem FTWs dengan pemanfaatan tanaman melati air (Echinodorus berteroi (Spreng.) Fassett) dan pisang–pisangan (Helliconia psittaforum) sebagai penyerap nutrien tersebut. Kolam percobaan sejumlah 4 (empat) diisi pupuk NPK sebagai limbah artifisial dengan konsentrasi N sebesar 2 mg/L. Kolam 1 merupakan kolam kontrol, kolam 2 berisi FTWs tanpa tanaman, kolam 3 berisi FTWs dengan tanaman melati air, dan kolam 4 berisi FTWs dengan tanaman pisang-pisangan. Sampling air dilakukan pada hari ke 3, 10, 24, 35, dan 112. Parameter yang diukur adalah pH, suhu air, kekeruhan, konduktivitas, oksigen terlarut, ammonia, nitrat, dan TN. Tanaman melati air dapat menyisihkan ammonia sebesar 91,19%, nitrat sebesar 100% dan TN sebesar 77,04%. Sedangkan, tanaman pisang-pisangan dapat menyisihkan ammonia sebesar 90,30%, nitrat sebesar 100% dan TN sebesar 67,12%. Kedua jenis tanaman menunjukkan pertumbuhan yang baik, yang ditandai dengan tumbuhnya daun, batang, bunga, dan akar tanaman. Hal ini menunjukkan bahwa kedua jenis tanaman tersebut memiliki kemampuan menyerap nutrien nitrogen secara efektif melalui sistem pengolahan FTWs.

Wastewater treatment plants (WWTPs) can act as both a barrier but also as an entrance route for microplastics (MPs) into aquatic environment. This study investigated the first occurrence and characteristics of MPs in Setiabudi Jakarta WWTP. Sampling technique, extraction methods, and quantification as well as characterization of MPs was carried out based on some related previous studies. The results showed that MPs concentration detected in the influent was 17.1 (± 5.65) items/L, and it was reduced to 1.41 (± 0.01) items/L in the effluent, indicating that approximately 91.29% of MPs in raw wastewater was removed during the treatment. Based on the daily effluent discharge, it is estimated that around 352.5 of MPs are released from the WWTP each day. The light microscopic method used for quantification and characterization revealed that MPs was widely distributed in the 100–5000 μm range. The color of MPs in both influent and effluent was mainly composed of white or transparent (35%) and black (17–25.4%). Based on shape category, fibers (68–70.17%) are the dominantly found in two sampling points, followed by fragments (23.68–26.24%), films (0.71–2.9%), microbeads (0.4–1.4%) and foams (1.4–2.8%). Our findings demonstrates that the presence of Setiabudi WWTP can significantly reduce the MPs pollution from raw wastewater, however, MPs discharged into the environment was still considerably high.