Ekologia: Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup

ESTIMASI EMISI GAS RUMAH KACA BERDASARKAN PENIMBUNAN SAMPAH DI TPA GILI TRAWANGAN

Siska Ita Selvia — 2025-04-30

Gili Trawangan, one of the small island clusters in West Nusa Tenggara Province, faces serious problems in managing waste piled up in landfills with the open dumping method by only piling up without any backfilling or other processing. As a result, the Gili Trawangan TPA often experiences fires and explosions, indicating that the waste piles contain gas. This study aims to measure the potential gas stored in the piles of waste at the Gili Trawangan TPA Landfill and determine a strategy for developing methane gas potential as an alternative renewable energy for small islands. GHG emissions from landfills cannot be reduced even with technological advances, but the release of methane into the atmosphere can be significantly reduced by collecting methane gas. The methane gas content of waste at the Gili Trawangan TPA can be concluded that the peak of total methane gas production will occur in 2024, reaching a maximum of 192.23 MWh/year in the form of electrical energy and the form of gas as much as 216 kg of LPG/day. The potential energy figures obtained come from the potential of methane gas deposits in the same year of 172,100 m3/year based on modeling results using LandGEM software. Therefore, the potential of methane gas stored in waste piles can be used as an alternative energy source or as a starting point for policy-making for managing organic waste that triggers the formation of methane gas.

Keywords: gili trawangan, landGEM, methane gas, waste

IDENTIFIKASI KERAWANAN BAHAYA LONGSOR PADA KAWASAN TERBANGUN DALAM UPAYA MITIGASI BENCANA DI KOTA BOGOR

Indarti Komala Dewi — 2025-04-30

Landslides are the most common type of disaster in Bogor City compared to other disasters. The large number of built-up areas that are not following the Bogor City Spatial Plan (RTRW) has the potential to cause disasters that can result in material losses and fatalities. The objectives of the study: 1) Identifying the level of landslide susceptibility in Bogor City, 2) Identifying the level of landslide susceptibility in built-up areas in Bogor City. This study used the Geographic Information System (GIS) method using 5 landslide susceptibility parameters, namely: rainfall, rock type, soil type, slope, and land use. The results of this study indicate that from the area of Bogor City of 11,130.31 ha, areas with low level of landslide susceptibility are 50,20%, areas with moderate level of landslide susceptibility are 46,36%) and areas with high level of landslide susceptibility are 383.54 ha (3,45%). The built-up area in Bogor City is 6,274.34 ha, low landslide susceptibility is 60,69%, medium landslide susceptibility is 54,35% and high level of landslide susceptibility is 20,65%. There are built-up areas that are in line with the Bogor City Spatial Plan 2011-2031 with a moderate landslide susceptibility level of 45.44% and a high landslide susceptibility level of 16.87%. Based on these findings, the Bogor City Government can proactively reduce disaster risks in areas with medium and high landslide susceptibility. To mitigate it, stricter spatial planning controls and Building and Environmental Planning are needed for settlements located in areas with high landslide susceptibility.

Keywords: Landslide, Built-up Area, Spatial Plan

IDENTIFIKASI BAKTERI Escherichia Coli DAN COLIFORM PADA DEPOT AIR MINUM ISI ULANG KECAMATAN TRUCUK BOJONEGORO

Isna Nur Amalia — 2025-04-30

Water is a very basic need for human life on earth. At this time, water is a problem that needs careful attention. Drinking water is water that is consumed directly by humans through a processing process or processing stages that meet health requirements. The busier human activities are, the more people tend to choose a more practical way with relatively low costs in meeting drinking water needs. The fulfillment of drinking water needs is highly dependent on the coverage of drinking water services and sanitation conditions in the community. This study aims to determine the level of contamination of Escherichia coli and coliform bacteria in refill drinking water and the feasibility of refill drinking water depots in Trucuk District, Bojonegoro Regency. The method used in this study is descriptive with a quantitative approach. The results of the study from 4 samples, namely AB, DAM 1, DAM 2, and DAM 3. 3 samples including AB, DAM 1, and DAM 3 were positive for containing Escherichia coli and coliform bacteria. Refill drinking water samples and raw water do not meet the requirements in accordance with the quality standards in the Regulation of the Minister of Health of the Republic of Indonesia No. 492 of 2010 "Concerning Drinking Water Quality Requirements" where the standard for microbiological parameter quality is 0 CFU / 100 ml.

Keywords: Drinking water; Escherichia coli; Coliform

PROFIL HUTAN PEGUNUNGAN KAMOJANG, JAWA BARAT

Isoralla — 2025-04-30

This research was aims to study natural and disturbed mountain forest profile of Kamojang at 1300-1600 m dpl, West Java. Forest profile was made by Oldeman method, data were collected by quadrat plots size 20m x 20m with 4 times replicated. The result showed natural forest composed by 5 strata, disturbed forest composed by 3-4 strata without first strata. The most abundance trees in first strata was Castanopsis javanica between 2-11 ind/0,16 ha and in second strata was Engelhardia spicata between 5-7 ind/0,16 ha. All these locations study were not found any emergent trees and composed by different vegetation because of selective cutting activity to vegetation that had economic value. The most abundance growthform in natural and disturbed forest were sapling between 15-32 species/0,16 ha in natural forest and 3-23 species/0,16 ha in disturbed forest. The most abundance trees and sapling in natural forest were Villebrunea rubescens between 5-51 ind/0,16 ha. In contrast, most abundance trees in disturbed forest were Altingia excelsa 20 ind/0,16 ha and sapling were Erythtroxylum cuneatum between 1-19 ind/0,16 ha. There were variation presence of trees-seedling in natural forest, the most abundance were Morinda tomentosa between 1-26 ind/0,16 ha. The most abundance trees-seedling in disturbed forest were Dysoxylum parasiticum, Hypobathrum racemosum, Laportea sp., dan Macaranga rhizinoides between 3 ind/0,16 ha in Raksamala rehabilitated forest which growth naturally. Cover of canopy in natural forest were 0,17-0,32 ha/0,16 ha. In contrast, there were 0,02-0,08 ha/0,16 ha in disturbed forest. Nutrients content of soil such as NO₃, NH₄, PO4, K⁺, C, and BO in all locations were high. Content of nitrate around 10-60 ppm. Natural forest had interlock canopy and quilted layers which good for water conservatories. Both natural and disturbed forest were found invasive species Eupatorium odoratum. The limiting factor were the light and human activity.

Keywords: ecosystem services, tropical forest stratification, tropical montane forest

FITOREMEDIASI LIMBAH LAUNDRY MENGGUNAKAN TUMBUHAN ECENG GONDOK (Eichhornia crassipes)

Hesti Asriva Agustina — 2025-04-30

The increasing number of laundry businesses has led to higher detergent usage, containing pollutants such as Sodium Dodecyl Benzene Sulfonate (NaDBS) and Sodium Tripolyphosphate (STPP), which are difficult to decompose naturally and can contaminate aquatic environments. This study aims to analyze the effectiveness of phytoremediation using water hyacinth (Eichhornia crassipes) in reducing pollutant concentrations in laundry wastewater, focusing on COD, TSS, and phosphate parameters. The research utilized purposive sampling to collect laundry wastewater samples from a large-scale laundry outlet in Sumbang, Bojonegoro, and water hyacinth samples from a fish pond in Sukorejo, Bojonegoro. Wastewater treatment was conducted in treatment tanks for 14 days, with initial (day 0) and final (day 14) sample testing performed at the PPSDM Migas Cepu Laboratory. This research was conducted in an experimental and quantitative way to calculate its effectiveness. The results showed a visible transformation in laundry wastewater from turbid gray water to a clearer state after 14 days of treatment. Physical changes were also observed in the water hyacinth, including leaf discoloration to yellowish-brown and stem decomposition. Laboratory analysis confirmed that phytoremediation using water hyacinth effectively reduced pollutant concentrations, achieving COD reduction of 74–76%, TSS reduction of 90–95%, and phosphate reduction of 75–91%. Among these parameters, TSS removal showed the highest efficiency. These findings indicate that water hyacinth can serve as an eco-friendly alternative for laundry wastewater treatment.

Keywords: Laundry Wastewater, Water Hyacinth, Phytoremediation

KAJIAN POTENSI AIR PERMUKAAN SEBAGAI BAHAN BAKU WATER TREATMENT PLANT DI KAWASAN MARINA CITY BATAM

Ahmad Muda Bahri — 2025-04-30

The rapid population growth of Batam City has a significant impact on the availability of clean water, especially around Marina City Sekupang Tanjung Riau. In response to this, BP Batam and the developer of Marina City Sekupang plan to optimize the local natural reservoir as a source of raw water for the WTP (Water Treatment Plant). This study aims to evaluate the potential discharge and water quality in the natural lake in the Marina City area, Batam. The methodology uses a quantitative approach for hydrological analysis, including calculating flood discharge and determining the area of the water catchment area, based on direct field measurements. Social analysis uses a qualitative descriptive method. Water sampling follows the SNI 6989.57: 2008 procedure. The results of the study show that the estimated domestic water requirement per house connection in 2023 reaches 50.47 liters/second. Annual water evaporation is calculated based on the average evaporation rate in the Marina City lake of 22.29 mm/month or 0.776 mm/day. The total reservoir capacity is 869,249.00 m3, with a total water loss of 262,851 m3/day. This research provides important information for the development of water resources in the Marina City area, supporting efforts to meet the clean water needs of the local community and its surroundings

Kata Kunci: Raw Water, Water Treatment Plant, Water Quality