Sustinere: Journal of Environment and Sustainability
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Carrying Capacity and Institutional Analysis of Floating Net Cages in Jatiluhur Reservoir
No full textThe cultivation of freshwater fish with floating net-cages system in the area of Jatiluhur Reservoir, Purwakarta Regency has increased in quantity. It results in the pollution and sedimentation because of development of floating net-cages business which exceeds the carrying capacity of the reservoir. This research aimed to analyze the carrying capacity of Jatiluhur Reservoir, conduct the institutional analysis, and analyze the perception of stakeholders involved in floating net-cages management in Jatiluhur Reservoir. Interview and literature review were used as the primary and secondary data collection methods. The results showed that the number of floating net-cages units in accordance with the carrying capacity of Jatiluhur Reservoir was amounted to 6,838 floating net-cages. For the management of floating net-cages in Jatiluhur Reservoir, the Department of Animal Husbandry and Fisheries of Purwakarta Regency and Perum Jasa Tirta II have important roles in formulating regulations and providing guidance to the fish farmers. The transaction costs spent on formulating regulations and providing guidance by the Regional Government of Purwakarta Regency was amounted to Rp 689,400,000 per year while Perum Jasa Tirta II spent amounted to Rp 70,107,900 per year. Although stakeholders have common perception on ecological and economic aspects, they have different perception on the management aspects of floating net-cages
Study of turbidity treatment in Karangpilang II Water Treatment Plant
No full textKarangpilang II Water Treatment Plant (WTP) is part of the Karangpilang WTP of Surabaya Water Utilities, serving the water supply needs of Surabaya City. Karangpilang II WTP has the largest clean water production capacity within the Karangpilang WTP, reaching 2,500 L/s. Using conventional treatment to remove turbidity, the treatment process in Karangpilang II WTP consists of pre-sedimentation, clearator, and filter units.This study evaluated turbidity levels in production water and the efficiency of turbidity removal to assess the performance of Karangpilang II WTP in turbidity treatment. The evaluation was conducted using 2016 data by comparing the turbidity of production water with the Water Quality Standards of the Water Utilities, as well as by analyzing the turbidity of raw water, the effluents of each treatment unit, and the final production water.The evaluation results indicated that, in some instances, the turbidity in production water did not meet the required quality standards. Additionally, it was found that one unit within Karangpilang II WTP, namely the pre-sedimentation unit, exhibited inadequate performance in turbidity removal.Several solutions are proposed to address the turbidity removal issue at Karangpilang II WTP: increasing the maintenance schedule for the pre-sedimentation unit, determining the appropriate turbidity reference for coagulant dosing, optimizing the coagulant dose, utilizing sludge from water treatment as a coagulant aid alongside Al2(SO4)3, and using capping material in the filter unit
Mitigation strategy on reduction greenhouse gas (GHG) emission of landuse sector for the province of Papua
No full textStudying the right strategy for implementing mitigation measures to reduce GHG emissions in an effort to control climate change caused by deforestation and forest degradation (REDD+) in Papua Province is a crucial step that must be taken. In 2010, emission levels in Papua Province were dominated by the forestry sub-sector and other land use, amounting to 639,818,463 tons of CO2eq, which accounted for approximately 99.8% of the total GHG emissions of 640,737,952.64 tons of CO2eq.
To analyze the implementation strategy of REDD+ mitigation, the calculation of carbon emission levels must first be conducted. Carbon emission calculations for this sub-sector follow the methodology developed by the IPCC GL-2006. Meanwhile, for the forestry and other land use sub-sectors, both historical and forward-looking approaches were used.
The carbon emissions level from the forestry sub-sector was estimated at 921,779,031.23 tons of CO2eq using the historical method and 1,052,683,205.46 tons of CO2eq using the forward-looking method for the mitigation program at the end of 2020. The mitigation strategy focused on carbon uptake and carbon storage stabilization.
The mitigation scenario for the forestry sub-sector was capable of reducing emissions by 552,303,873 tons of CO2eq, equivalent to 52.47% of the total cumulative emissions at the end of 2020, based on the forward-looking method