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Abstrak :
The lakes in urban megacity Jakarta, called as ?setu or situ? by the local people, play a central role in integrated water resources management. Despite its pivotal role in maintaining the balance of urban water system, they have not received sufficient attention. Rapid urban development in a very distinct urban watershed type of lake?s surroundings has impacted on the water quantity and quality of urban lakes in megacity Jakarta. Chronic problems faced by downstream area in megacity Jakarta such as flash floods in the rainy season and water scarcity in the dry season have indicated that the lakes have not been managed and functioned well. Human and nature disturbances such as shoreline encroachment, shoreline erosion, garbage dump and inflow from untreated sewage and urban runoff have polluted the lake water and reduced its volume capacity. Nearly half of the existing lakes have reduced from 10 to > 50% of its water volume capacity due to lake area shrinkage, siltation and even excessive growth of invasive macrophytes. The lakes are mostly in disturbed to damaged environmental conditions. Lakes in urban and rural villages have less in water quantity and higher solids, organic matter, nutrients and even fecal bacteria concentrations than the lakes in planned residential, high-rise residential and industrial areas types of urban surroundings. As the lakes in the urban village and industrial area, elevated toxic metal concentrations have become public concern due to lake hygiene problems. Elevated nutrient concentrations have caused the lake eutrophication, where some lakes have suffered from excessive macrophyte coverage, algal bloom even toxic cyanobacterial bloom. The urban lakes in megacity Jakarta constantly have been degrading physically and ecologically affecting its water quantity and quality which is increasing the threat to human?s health and impact future human?s resilience in urban megacity Jakarta.

Abstrak :
Penelitian mengenai penilaian kesehatan perairan situ di Kampus Universitas Indonesia Depok dengan IBI (Index of Biotic Integrity) telah dilaksanakan di Situ Kenanga, Agathis, Mahoni, Puspa, Ulin, dan Situ Salam pada bulan Maret -- April 2016. Penelitian bertujuan untuk mengetahui apakah IBI dapat digunakan untuk menilai kesehatan perairan Situ Kampus UI dan bagaimana kondisi kesehatan perairan Situ Kampus UI. IBI diaplikasikan berdasarkan karakter komunitas ikan yang ada. Pengambilan sampel ikan dilakukan dengan metode sampling bebas menggunakan alat electrofishing gear, push net, cast net mata jaring 2,5 cm, dan lift net. Hasil penelitian menunjukkan bahwa IBI dapat digunakan untuk menilai kesehatan perairan berdasarkan komunitas ikan di Situ Kampus UI dengan diterapkannya beberapa modifikasi metrik. Kesehatan perairan di Situ Agathis, Mahoni, Puspa, dan Ulin tergolong sedang; kesehatan perairan di Situ Salam tergolong baik.

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A research about an assesment of freshwater lakes health in University of Indonesia Campus Depok has been implemented on Kenanga, Agathis, Mahoni, Puspa, Ulin, and Salam Lakes from March to April 2016. The aim of the study is to know if IBI (Index of Biotic Integrity) can be applied on UI Campus Lakes for assess freshwater lakes health and how is the condition of freshwater health in UI Campus Lakes. IBI is applied based on character of existing fish community. Fish sampling was done by free sampling method using an electrofishing gear, a push net, a cast net [mesh 2.5 cm], and a lift net. The results showed that IBI can be used to assess freshwater health based on fish community in UI Campus Lakes by applying several metric modifications. Freshwater health on Agathis, Mahoni, Puspa, and Ulin Lakes classified as moderate/fair; freshwater health on Salam Lakes classified as good.

Abstrak :
Danau Kenanga merupakan salah satu dari enam danau UI yang berperan sebagai daerah resapan air. Namun danau ini telah tercemar oleh berbagai jenis sampah organik dan anorganik, sedimen, residu pestisida, dan kontaminan lainnya, sehingga dapat menurunkan kualitas air. Oleh karena itu, penelitian ini bertujuan untuk mengoptimalkan proses pengolahan air Danau Kenanga dengan menerapkan metode Hybrid Ozonation-Coagulation (HOC), dengan fokus pada variasi pH dan dosis koagulan. Metode HOC diharapkan dapat meningkatkan efisiensi penghilangan polutan organik dan memastikan air memenuhi baku mutu kesehatan lingkungan. Analisis parameter seperti kandungan logam besi, mangan, pH, Total Dissolved Solid (TDS), total koliform, dan jumlah lumpur dilakukan untuk mengevaluasi efektivitas HOC. Hasil penelitian menunjukkan bahwa HOC merupakan metode yang paling efektif dibandingkan metode koagulasi dan ozonasi dalam pengolahan air Danau Kenanga dengan persentase perubahan TDS sebesar 18,18% dan persentase penyisihan kekeruhan sebesar 93,7%, logam Fe 84,75%, total coliform 99,69% , nilai logam Mn sebesar 0,1 mg/L, jumlah lumpur yang terakumulasi sebesar 1,4708 g pada pH 8 dan dosis koagulan Fe sebesar 50 ppm. ......Lake Kenanga is one of the six UI lakes which acts as a water catchment area. However, this lake has been polluted by various types of organic and inorganic waste, sediment, pesticide residues, and other contaminants, which can reduce water quality. Therefore, this research aims to optimize the Lake Kenanga water treatment process by applying the Hybrid Ozonation-Coagulation (HOC) method, with a focus on variations in pH and coagulant dosage. The HOC method is expected to increase the efficiency of removing organic pollutants and ensure that water meets environmental health quality standards. Analysis of parameters such as iron metal content, manganese, pH, Total Dissolved Solid (TDS), total coliform, and amount of sludge was carried out to evaluate the effectiveness of HOC. The results of the research show that HOC is the most effective method compared to coagulation and ozonation methods for treating Kenanga Lake water with a TDS change percentage of 18.18% and a turbidity removal percentage of 93.7%, Fe metal 84.75%, total coliform 99.69%, and the Mn metal value is 0.1 mg/L at pH 8 and the Fe coagulant dose is 50 ppm.