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Management Optimization of Saguling Reservoir with Bellman Dynamic Programming and âDu Couloirâ Iterative Method Marselina, Mariana; Sabar, Arwin; Salami, Indah R S; Marganingrum, Dyah
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

The increasingly growth of population and industry sector have lead to an enhanced demand for electrical energy. One of the electricity providers in the area of Java-Madura Bali (Jamali) is Saguling Reservoir. Saguling Reservoir is one of the three reservoirs that stem the flow of Citarum River in advance of to Jatiluhur and Cirata Reservoir. The average electricity production of Saguling Reservoir was 2,334,318.138 MWh/year in the period of 1986-2014. The water intake of Saguling Reservoir is the upstream Citarum Watershed with an area of 2340.88 km2 which also serves as the irrigation, inland fisheries, recreation, and other activities. An effort to improve the function of Saguling Reservoir in producing electrical energy is by optimizing the reservoir management. The optimization of Saguling Reservoir management in this study refers to Government Regulation No. 37/2010 on Dam/Reservoir Article 44 which states that the system of reservoir management consisting of the operation system in dry years, normal years, and wet years. In this research, the determination of the trajectory guideline in Saguling operation was divided in dry, normal and wet years. Trajectory guideline was conducted based on the electricity price of turbine inflow that various in every month. The determination of the trajectory guideline in various electricity price was done by using Program Dynamic Bellman (PD Bellman) and âDu Couloirâ iterative method which the objective to optimize the gain from electricity production. and âDu Couloirâ iterative method was development of PD Bellman that can calculate the value of gain with a smaller discretization until 0,1 juta m3 effectively where PD Bellman just calculate until 10 million m3. Â Smaller discretization can give maximum benefit from electricity production and the trajectory guideline will be closer to trajectory actual so optimization of Saguling operation will be achieved.

Rainfall Variability and Landuse Conversion Impacts to Sensitivity of Citarum River Flow Marganingrum, Dyah; Sabar, Arwin; Roosmini, Dwina; Pradono, P
Forum Geografi Vol 27, No 1 (2013): July 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i1.5074

The objective of this study is to determine the sensitivity of Citarum river flow to climate change and land conversion. It will provide the flow information that required in the water resources sustainability. Saguling reservoir is one of the strategic reservoirs, which 75% water is coming from the inflow of Upper Citarum measured at Nanjung station. Climate variability was identified as rainfall variability. Sensitivity was calculated as the elasticity value of discharge using three-variate model of statistical approach. The landuse conversion was calculated used GIS at 1994 and 2004. The results showed that elasticity at the Nanjung station and Saguling station decreased from 1.59 and 1.02 to 0.68 and 0.62 respectively. The decreasing occurred in the before the dam was built period (1950-1980) to the after reservoirs operated period (1986-2008). This value indicates that: 1) Citarum river flow is more sensitive to rainfall variability that recorded at Nanjung station than Saguling station, 2) rainfall character is more difficult to predict. The landuse analysis shows that forest area decrease to Â± 27% and built up area increased to Â± 26%. Those implied a minimum rainfall reduction toÂ± 8% and minimum flow to Â± 46%. Those were caused by land conversion and describing that the vegetation have function to maintain the base flow for sustainable water resource infrastructure.

Management Optimization of Saguling Reservoir with Bellman Dynamic Programming and âDu Couloirâ Iterative Method Marselina, Mariana; Sabar, Arwin; Salami, Indah R S; Marganingrum, Dyah
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i1.1682

The increasingly growth of population and industry sector have lead to an enhanced demand for electrical energy. One of the electricity providers in the area of Java-Madura Bali (Jamali) is Saguling Reservoir. Saguling Reservoir is one of the three reservoirs that stem the flow of Citarum River in advance of to Jatiluhur and Cirata Reservoir. The average electricity production of Saguling Reservoir was 2,334,318.138 MWh/year in the period of 1986-2014. The water intake of Saguling Reservoir is the upstream Citarum Watershed with an area of 2340.88 km2 which also serves as the irrigation, inland fisheries, recreation, and other activities. An effort to improve the function of Saguling Reservoir in producing electrical energy is by optimizing the reservoir management. The optimization of Saguling Reservoir management in this study refers to Government Regulation No. 37/2010 on Dam/Reservoir Article 44 which states that the system of reservoir management consisting of the operation system in dry years, normal years, and wet years. In this research, the determination of the trajectory guideline in Saguling operation was divided in dry, normal and wet years. Trajectory guideline was conducted based on the electricity price of turbine inflow that various in every month. The determination of the trajectory guideline in various electricity price was done by using Program Dynamic Bellman (PD Bellman) and âDu Couloirâ iterative method which the objective to optimize the gain from electricity production. and âDu Couloirâ iterative method was development of PD Bellman that can calculate the value of gain with a smaller discretization until 0,1 juta m3 effectively where PD Bellman just calculate until 10 million m3. Â Smaller discretization can give maximum benefit from electricity production and the trajectory guideline will be closer to trajectory actual so optimization of Saguling operation will be achieved.

Kajian Perhitungan Beban Pencemaran Air Sungai Di Daerah Aliran Sungai (DAS) Cikapundung dari Sektor Domestik Rahayu, Yushi; Juwana, Iwan; Marganingrum, Dyah
Jurnal Rekayasa Hijau Vol 2, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Institut Teknologi Nasional

ABSTRAKSungai Cikapundung merupakan anak sungai DAS Citarum Hulu yang digunakan untuk sumber air baku air minum, irigasi dan perikanan di Kota Bandung. Sungai Cikapundung yang melewati Kabupaten Bandung Barat, Kota Bandung dan Kabupaten Bandung berpotensi tercemar oleh limbah dari sektor domestik. Namun saat ini belum ada informasi mengenai beban pencemar terhadap Sungai Cikapundung dari sektor domestik. Oleh karena itu perlu dilakukan penelitian dengan tujuan untuk mengukur tingkat pencemaran di Sungai Cikapundung dengan menghitung, status mutu air, potensi beban pencemaran sektor domestik. Status mutu air ditentukan dengan menggunakan metode indeks pencemar dan potensi beban pencemaran Sungai Cikapundung dihitung menggunakan pendekatan faktor emisi limbah domestik. Berdasarkan hasil perhitungan menunjukan bahwa Sungai Cikapundung pada tahun 2016 memiliki kriteria mutu air cemar sedang pada bulan kering dan cemar ringan di bulan basah. Sungai Cikapundung telahtercemar limbah domestik berdasarkan hasil perhitungan beban pencemar mengalami kenaikan seiring dengan meningkatnya jumlah penduduk pada tahun 2021 oleh 25.383,89 Kg/ hari TSS, 17.537,96 kg/hari BOD, 18.461,01 kg/hari COD, 889,97 kg/hari N-Total dan 96,92 Kg/hari P-Total.Kata kunci: Beban Pencemar, Domestik Cikapundung, Kualitas AirABSTRACTCikapundung river is the sub river of upper Citarum River which was used by the people in Bandung city as a raw water for drinking water, irrigation and fishery. Cikapundung river that passes through many districts of Bandung have a great potential of being polluted by from domestic waste. This condition will affects the water quality of Cikapundung water. Having this condition, the urgency of conducting the research for measure the polution level at Cikapundung river was reasonable, with calculating the water quality status, the potential polutions domestic sector. Water quality status is determined by using pollution index method and potential pollution load of Cikapundung River using domestic polution emission factor approach. Result of pollutant index calculation Cikapundung River at 2016 in dry months has severe polluted water quality. Cikapundung watershed contaminated with domestic waste in the calculation of polluted pollutant potency in 2016 by 25.383,89 Kg / day TSS, 17,537.96 kg / day BOD, 18.461.01 kg / day COD, 889.97 kg / day N-Total and 96.92 Kg / day P-Total.Keywords: Pollution Load, Cikapundung Domestic, Water.

Kajian Perhitungan Beban Pencemaran Sungai Cisangkuy di Cekung Bandung dari Sektor Pertanian Sampe, Hisky Robinson; Juwana, Iwan; Marganingrum, Dyah
Jurnal Rekayasa Hijau Vol 2, No 2 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Institut Teknologi Nasional

ABSTRAKSungai Cisangkuy merupakan bagian dari anak sungai Citarum Hulu yang terdapat di kawasan Cekungan Bandung, yang melewati wilayah administrasi Kabupaten Bandung. Aktivitas manusia seperti kegiatan pertanian mempengaruhi kualitas air yaitu berpotensi memberikan beban pencemaran BOD, TSS, Total N dan Total P di Sungai Cisangkuy. Penelitian tentang beban pencemaran dilakukan karena tidak tersedianya informasi mengenai daya tampung beban pencemaran dari sektor pertanian. Penelitian ini bertujuan untuk mengetahui jumlah beban pencemaran yang masuk ke Sungai Cisangkuy, sehingga melalui penelitian ini akan diketahui besaran beban pencemaran yang masuk ke Sungai Cisangkuy khususnya dari sektor pertanian. Analisis kualitas air dilakukan dengan menggunakan metode indeks pencemaran. Perhitungan potensi beban pencemaran dilakukan dengan menggunakan pendekatan faktor emisi. Beban pencemaran eksisting kemudian dibandingkan dengan beban pencemaran maksimum yang digunakan sebagai baku mutu daya tampung beban pencemaran sungai. Hasil perhitungan menunjukkan bahwa trend pencemaran sungai Cisangkuy cenderung meningkat dari tahun 2012-2015. Indeks Pencemaran Sungai Cisangkuy masuk dalam kategori Cemar Sedang dengan nilai 7,07, dan beban pencemaran total dari sektor pertanian bernilai 1,55 ton/hari.Kata kunci: Cisangkuy, Indeks Pencemaran, Pertanian, Beban PencemaranABSTRACTCisangkuy River is part of the upstream Citarum tributary in the area of Bandung Basin, which passes the administrative area of Bandung regency. Human activities such as agricultural activities affect the quality of water that potentially provide pollution load BOD, TSS, Total N and Total P in the Cisangkuy River. Research on pollution load is needed because the inavailability of information about pollution load capacity from agriculture sector. This study aims to determine the amount of pollution load being discharged into the Cisangkuy River from agricultural sector. Water quality analysis is done by using pollution index method. Calculation of potential pollution load is done by using the emission factor approach. Existing pollution loads are then compared with the maximum pollution loads used as the quality standard of river pollution load capacity. The results show that pollution of the river Cisangkuy tends to increase from the year 2012-2015. The Cisangkuy River Pollution Index is categorized as 7.07, and the total pollution load from the agricultural sector is 1.55 tons / day.Keywords: Cisangkuy, Pollution Index, Agricultural, Pollutant Load

Evapotranspiration of Indonesia Tropical Area Marganingrum, Dyah; Santoso, Heru
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 16, No 3 (2019): November 2019
Publisher : Universitas Diponegoro

Indonesia is an archipelago country with a tropical climate. The region of Indonesia is quite large and located between two continents (Asia and Australia) and between two oceans (Indian and Pacific), making the territory of Indonesia has a unique climate pattern. One of the climate variables that quite important to be studied in this chapter is evapotranspiration. The Thornthwaite method was used to estimate potential evapotranspiration based on average air temperature. The relationships between evapotranspiration, precipitation, and elevation were then examined. Besides, temperature variations that affect climate patterns between monsoonal and equatorial regions were compared, between the mainland and small islands, and between mountain and coastal area. The impact of global warming was also examined on the climate and potential evapotranspiration of the Indonesian region. Data analysis showed that evapotranspiration correlates weakly with precipitation, and the contrary, the evapotranspiration correlates strongly with elevation, with correlation indices of 0.02 and 0.89, respectively. The study confirmed that air temperature is the primary controlling variable of the evapotranspiration in this very heterogeneous landscape. Under a global temperature increase of 1.5 Â°C above the pre-industrialized year (1765), the evapotranspiration is expected to increase in a range from 4.8 to 11.1%. In general, the excess of water to restore soil moisture in the future tends to decrease, i.e., drier.

Jejak Ekologis Kawasan Regional Bandung Marganingrum, Dyah
Jurnal Teknologi Lingkungan Vol. 20 No. 2 (2019)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

ABSTRACTThis paper aims to explain the application of Ecological FootprintÃ‚Â method as an approach for finding out the carrying capacity of the region. Case study was conducted in Bandung Basin Area that called as The Bandung Regional area. Ecological Footprint Analysis was done by using the Workbook and Guidebook National Footprint Account 2008 that prepared by the Global Footprint Network (GFN). Results of the analysis showed that the ecological footprint of Bandung Regional has been deficit of 1.31 gha/capita (EF Consumption is 1.37 gha/capita and biocapacity is 0.06 gha/capita). Thus, the supply-demand ratio is 0.04. This value ratio is less than one so it is categorized as the overshooting status. This status indicates that the carrying capacity of resources has been overloaded in the Bandung Regional. Therefore, it requires the number of efforts including regulation that can alter the consumption pattern and create metabolic utilization of natural resources which is more circular than linear. In addition, it needs a good cooperation among stakeholders in the surrounding area of Regional Bandung to meet the demands of all communities in Bandung region.Keywords: Bandung regional, carrying capacity, ecological footprint, overshootÃ‚Â ABSTRAKMakalah ini bertujuan menjelaskan hasil aplikasi metode jejak ekologis sebagai salah satu pendekatan untuk mengetahui daya dukung lingkungan suatu kawasan. Studi kasus dilakukan di Kawasan Cekungan Bandung yang disebut juga sebagai Regional Bandung. Analisis jejak ekologis dilakukan dengan memanfaatkan WorkbookÃ‚Â dan Guidebook National Footprint AccountÃ‚Â Tahun 2008 yang disediakan oleh Global Footprint NetworkÃ‚Â (GFN). Hasil analisis menunjukkan bahwa jejak ekologis Regional Bandung mengalami defisit sebesar 1.31 gha/kapita dengan nilai jejak ekologis konsumsi (EF consumption) sebesar 1.37 gha/kapita dan biokapasitasnya sebesar 0,07 gha/kapita. Dengan demikian rasio supply-demandÃ‚Â sebesar 0.04. Nilai rasio supply-demand kurang dari satu dikategorikan sebagai status overshoot. Status ini mengindikasikan bahwa daya dakung sumber daya alam di kawasan Regional Bandung telah terlampaui. Oleh karena itu diperlukan berbagai upaya termasuk regulasi yang dapat merubah pola konsumsi dan menciptakan metabolisme pemanfaatan sumber daya alam yang lebih bersifat sirkuler daripada linier. Selain itu perlu dilakukan kerjasama yang baik diantara pemangku kepentingan di wilayah sekitarnya untuk memenuhi segala kebutuhan masyarakat di Regional Bandung.Ã‚Â Kata kunci: daya dukung, jejak ekologis, regional Bandung, terlampaui

Penilaian Daya Tampung Sungai Jangkok dan Sungai Ancar Terhadap Polutan Organik Marganingrum, Dyah; Djuwansah, Muhammad Rahman; Mulyono, Asep
Jurnal Teknologi Lingkungan Vol. 19 No. 1 (2018)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Makalah ini bertujuan melakukan penilaian daya tampung sungai Jangkok dan Sungai Ancar terhadap polutan organik. Metode yang digunakan adalah persamaan Oxygen Sag Streeter Phelps dengan data pengukuran hidrolik sungai maupun data polutan kimia organik. Ã‚Â Polutan organik yang diukur terdiri atas oksigen terlarut (DO), penggunaan oksigen secara biologis (BOD), dan penggunaan oksigen secara kimiawi (COD). Hasil analisis menunjukkan bahwa Sungai Jangkok masih memiliki kemampuan daya pulih secara alamiah pada segmen yang diukur dengan nilai DO defisit maksimum sebesar 1889 kg/hari. DO defisit tersebut terkait dengan tingginya nilai BOD pada titik pengamatan karena penambahan air buangan melalui saluran drainase. Sedangkan Sungai Ancar menunjukkan kondisi dimana daya pulihnya relatif lebih rendah meskipun DO defisit maksimumnya lebih kecil dari Sungai Jangkok, yaitu sebesar 1044 kg/hari. Ada inidkasi bahwa rendahnya DO defisit pada Sungai Ancar karena adanya faktor turbulensi yang dapat meningkatkan laju reaerasi. Turbulensi terjadi karena adanya bebatuan yang terletak di aliran sungai serta bendung. Oleh karena itu, guna meningkatkan daya tampung sungai terhadap polutan yang masuk, perlu melakukan dua usaha secara simultan yaitu pengendalian limbah yang masuk ke badan sungai serta intervensi teknologi.Ã‚Â

Studi Pendahuluan Pemanfaatan Sludge IPAL Industri Tekstil Sebagai Bahan Baku Briket: Study of Utilization Textile Industry Sludge from WWTP as Raw Material for Briquettes RAHMAULINA, DINI; HARTATI, ETIH; MARGANINGRUM, DYAH
Jurnal Teknologi Lingkungan Vol. 23 No. 1 (2022)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

ABSTRACT The sludge textile industry was a by-product from wastewater treatment plant (WWTP) categorized as toxic and hazardous waste, sludge (SL) produced every day from WWTP could cause problems in the factory environment, such as reducing the storage space and aesthetic of the factory environment. This study discussed sludge that will be used as raw materials for briquettes. The analysis of the study was based on proximate analysis, calorific value, total sulfur, heavy metals, and slagging and fouling potential, which used method ASTM, AAS, Spectrophotometry and Gravimetry. These sludge briquettes materials were also added with additional raw material: bottom ash (BA); afterwards, it was mixed with sludge, and the compositions were 90%BA:10%SL, 80%BA:20%SL, and 70%BA:30%SL. The characteristic quality of briquettes was compared to Ministry of Environmental Regulation Number 06 of 2021 and Indonesia National Standard Number 4931 of 2010. The analysis of sludge material for briquette had moisture content, ash content, volatile matter, fixed carbon, calorific value, and total sulfur of 2.57%, 7.92%, 4.76%, 13.47%, 1,172 kcal/kg, and 0.98%, respectively. In addition, the slagging and fouling potential indicated moderate and low classification with the impact value index of 0.310 and 0.412, respectively. The study results also showed that the best briquette was a briquette that uses a composition of 70%BA:30%SL. This briquette had a calorific value of 1,473 kcal/kg; however, it has not met the provisions of the Ministry of Environmental and Forestry Regulation Number 06 of 2021 and Indonesia National Standard Number 4931 of 2010. ABSTRAK Sludge Industri Tekstil merupakan hasil samping dari proses Instalasi Pengolahan Air Limbah (IPAL) yang tergolong ke dalam limbah B3, sludge (SL) yang dihasilkan dari IPAL dapat menimbulkan masalah berupa berkurangnya ruang penyimpanan sludge serta menganggu estetika lingkungan pabrik. Studi ini membahas sludge yang selanjutnya akan digunakan sebagai bahan baku bahan bakar briket. Analisis studi yang akan dikaji yaitu analisis proksimat, nilai kalor, total sulfur, kandungan logam berat serta potensi terjadinya slagging dan fouling menggunakan metode ASTM, AAS, Spektrofotometri serta Gravimetri. Briket berbahan baku sludge kemudian ditambahkan bahan baku tambahan berupa bottom ash (BA) yang kemudian dicampur dengan sludge pada komposisi 90%BA:10%SL, 80%BA:20%SL, dan 70%BA:30%SL. Kualitas briket tersebut dibandingkan dengan Peraturan Menteri Lingkungan Hidup No 06 Tahun 2021 dan SNI 4931 Tahun 2010. Berdasarkan studi yang dilakukan sludge memiliki kandungan kadar air, kadar abu, volatile matter, fixed carbon, nilai kalor, dan total sulfur secara berturut-turut 2,57%, 79,2%, 4,76%, 13,47%, 1.172 kkal/kg dan 0,98%. Selain itu penggunaan sludge terhadap potensi slagging dan fouling terindikasi sedang dan rendah dengan indeks secara berturut-turut 0,310 dan 0,412. Berdasarkan studi, briket terbaik terdapat pada briket dengan komposisi 70%BA:30%SL dengan nilai kalor sebesar 1.473 kkal/kg namun briket tersebut masih belum memenuhi kualitas yang diharapkan berdasarkan Peraturan Menteri Lingkungan Hidup dan Kehutanan Nomor 06 Tahun 2021 dan SNI 4931 Tahun 2010.

EVALUASI KEBIJAKAN BAKU MUTU AIR LIMBAH (STUDI KASUS: LIMBAH CAIR INDUSTRI TEKSTIL DI BANDUNG) Dyah Marganingrum; Lenny Marilyn Estiaty
Jurnal Lingkungan dan Bencana Geologi Vol 7, No 1 (2016)
Publisher : Badan Geologi

ABSTRAKBaku Mutu Air Limbah (BMAL) dibuat sebagai salah satu bentuk regulasi untuk mengendalikan tingkat pencemaran.Makalah ini bertujuan untuk mengkaji dan mengevaluasi peraturan BMAL, khususnya untuk industri tekstil di Bandungyang berada di kawasan DAS Citarum. Metode yang digunakan adalah pendekatan analitik regulasi terkait. Eksperimentasidegradasi limbah industri tekstil PT. X menggunakan bakteri Bacillus licheniformis juga dilakukan untuk memperkuatrekomendasi. Hasil analisis menunjukkan bahwa terdapat beberapa parameter pada BMAL yang bernilai lebih tinggi daribaku mutu air (BMA) yang digunakan sebagai acuan untuk pengendalian kualitas air Sungai Citarum. Sementara analisisdata primer dan sekunder di beberapa titik Sungai Citarum telah menunjukkan kondisi tercemar, sehingga dapat dipastikanbahwa air limbah industri tekstil yang dibuang ke badan air Sungai Citarum maupun anak-anak sungainya akan selalumemberikan beban terhadap Sungai Citarum. Hasil eksperimen terhadap degradasi air limbah juga menunjukkan bahwanilai BOD dan COD mengalami penurunan, namun tidak signifikan memberikan perubahan warna sebelum dan setelahpengolahan. Hasil pengenceran untuk menyesuaikan nilai COD dengan BMAL hingga 150 mg/l juga tidak memberikanperbedaan warna yang signifikan. Oleh karena itu, BMAL perlu segera dievaluasi dan disesuaikan dengan daya dukung dandaya tampung Sungai Citarum agar tetap sesuai dengan peruntukannya.Kata kunci: Bacillus licheniformis, Citarum, regulasiABSTRACTWastewater quality standard (BMAL) is the regulation policy for controlling water pollution level. This paper aims to examineand to evaluate the wastewater quality standard rules (BMAL), especially for textile industries in Bandung located suroundingthe Citarum Watershed. The method used is the related regulation analytical approach. Experimentation of degradation of textileindustry wastewater from PT. X using bacteria Bacillus licheniformis was carried out to strengthen the recommendation. Theanalysis showed that there are some parameters on BMAL which have higher values than the water quality standard (BMA) usedas a reference for water quality control to Citarum River. The primary and secondary data analyses at some points of CitarumRiver show polluted conditions. Thus, it can be ascertained that the textile industry wastewater discharged into the water body ofCitarum River and its tributaries will always give load of contaminants. Results of experiments on the degradation of wastewateralso show that the BOD and COD values decreased, but not significantly give a colour change before and after the treatment. Resultdilution to adjust the value of COD with BMAL up to 150 mg/l also did not provide significant colour differences. Therefore,BMAL needs to be evaluated and adjusted to the carrying capacity of Citarum River in order to keep its function as intended.Keywords: Bacillus licheniformis, Citarum River, regulation

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