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Pendugaan Struktur Geologi Bawah Permukaan Daerah Terdampak Lumpur Sidoarjo (Lusi) Berdasarkan Analisis Data Geomagnet Imam Setiadi; Arif Darmawan; Marjiyono Marjiyono
Jurnal Lingkungan dan Bencana Geologi Vol 7, No 3 (2016)
Publisher : Badan Geologi

ABSTRAKSemburan lumpur Sidoarjo (Lusi) sudah menjadi isu nasional yang berdampak pada berbagai aspek, yaitu teknis, politis, ekonomi, dan sosial. Penyebab terjadinya semburan lumpur tersebut hingga saat ini masih menjadi perdebatan, apakah oleh faktor alam yang dipicu oleh gempa Yogyakarta atau akibat kesalahan teknis proses pemboran. Dari aspek geologi, daerah Sidoarjo termasuk ke dalam Zona Kendeng yang banyak memunculkan bentukan gunung lumpur. Selain itu, daerah ini dilewati oleh sesar Watukosek yang diduga sebagai struktur keluarnya lumpur panas dari dalam bumi. Penelitian geofisika menggunakan metode geomagnet ini bertujuan untuk mengetahui struktur geologi bawah permukaan berdasarkan parameter fisis kerentanan magnetik (magnetic susceptibility). Analisis data yang dilakukan di antaranya dengan penerapan reduksi medan magnet ke kutub (reduced to the pole), pseudogravity, dan pemodelan 2D bawah permukaan. Hasil yang diperoleh menunjukkan bahwa dari peta reduced to the pole dan peta pseudogravity telihat adanya patahan yang memanjang dengan arah relatif utara - selatan. Hasil pemodelan struktur bawah permukaan daerah terdampak lumpur Sidoarjo menghasilkan beberapa lapisan dan menunjukkan adannya patahan. Lapisan pertama adalah top soil, lapisan kedua lempung dengan perselingan batupasir, serta lapisan ketiga batu pasir dan serpih.Kata kunci: geomagnetik, reduksi ke kutub, model 2D bawah permukaan, Lumpur SidoarjoABSTRACTSidoarjo mud flow (Lusi) has become a national issue that affects almost all aspects i.e. technical, political, economic, and social. The cause of the mud flow is still debatable up to now, whether due to a natural factor which was triggered by the Yogya earthquake or was caused by technical errors in the drilling process. In terms of the geological aspect, Sidoarjo area is included in the Kendeng zone which raises many mud volcano formations. Besides, the area is passed by Watukosek fault structure which is presumed as the source of mud flow from the earth. The geophysical research using geomagnetic method aims to determine the subsurface geological structure based on physical parameters of magnetic susceptibility. Geophysical data analysis such as a reduction to the pole, pseudogravity, and 2D subsurface modeling were applied to the geomagnetic data. The results obtained from geophysical data analysis show that reduced to the pole and pseudogravity map indicate the presence of the fault that extends relative to north - south direction. The results of the subsurface structure modeling using geomagnetic method in Sidoarjo mud flow area produce some layers and show some faults. The first layer is top soil, the second is interfingering clay and sandstone, and the last is sandstone and shale.Keywords : geomagnetic, reduction to the pole, 2D subsurface model, Sidoarjo mudflow

DETERMINING THE DESALINATION UNIT COMPOSITION FOR COSTAL AREAS AND SMALL ISLANDS USE ANALYTIC HIERARCHY PROCESS Imam Setiadi; Dinda Rita K. Hartaja
Jurnal Rekayasa Lingkungan Vol. 9 No. 1 (2016): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v9i1.1986

Selection of the appropriate composition desalination units can be done with a variety of method approaches, one of the method is the Analytic Hierarchy Process. In determining the desalination unit with AHP method to consider is setting a goal, an alternative criteria and pairwise comparison. Research for the determination of the exact composition of the desalination unit in order to achieve sustainable drinking water suppy in coastal areas and small islands has been conducted. The results of the study are as follows, the energy demand of 50.83%, operator costs of 26.64%, maintenance costs of 14.13% and chemical requirement 8.4%. For an alternative composition desalination unit of RO 10 m3 / day is the best alternative composition with value of 59.61%, the composition of the next alternative is RO 20 m3/ day of 30.40% and the last alternative of the desalination unit composition is RO 120 m3/ day of 09.99%.Key words : Desalination, Mukti Stage Flash Composition, AHP

DESIGN PLANNING WASTEWATER TREATMENT PLANT OF NATA DE COCO INDUSTRY WITH THE ACTIVATED SLUDGE PROCESS Dinda Rita K. Hartaja; Imam Setiadi
Jurnal Rekayasa Lingkungan Vol. 9 No. 2 (2016): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v9i2.1994

Generally, wastewater of nata de coco industry contains suspended solids and COD were high, ranging from 90,000 mg / l. The high level of of the wastewater pollutants, resulting in nata de coco industry can not be directly disposed of its wastewater into the environment agency. Appropriate technology required in order to process the waste water so that the treated water can meet the environmental quality standards that are allowed. Designing the waste water treatment plant that is suitable and efficient for treating industrial wastewater nata de coco is the activated sludge process. Wastewater treatment using activated sludge process of conventional (standard) generally consists of initial sedimentation, aeration and final sedimentation.Keywords : Activated Sludge, Design, IPAL

SELF-MONITORING ANALYSIS RESULTS DATABASE DESIGN FOR WASTEWATER TREATMENT INSTALATION IN MANUFACTURING INDUSTRY PACKAGING CANS Oman Sulaeman; Imam Setiadi
Jurnal Rekayasa Lingkungan Vol. 9 No. 2 (2016): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v9i2.1998

In monitoring the environmental quality, besides it needs the data analysis also requires the presentation of accurate data so as to display an useful information. If the data is not immediately available it is feared worsening quality changes that will lead to difficulties in recovery. Self-monitoring analysis results database design for wastewater treatment instalation in manufacturing industry packaging cans aims to create a new procedure in terms of the storage and management to create a new procedure in termsof the storage and management of data replaces the old method is still conventional. Database design also features graphic user interface (GUI) as a medium for user interaction with the database software. Database database software is designed with the Logical database design method in which the process of making a model of the information used in the company based on the model-specific data, but does not depend on the Database Management System (DBMS). DBMS is a software that allows users to define, create, maintain, and control access to the database. Results to be achieved with the existence of this database is that users can easily perform datastorage, update the data, speed up retrieval of earlier data, and assist to present a report. Given this self-monitoring analysis results database, the data can be stored properly and safely on the database to be managed in the future as well as complementary data sources in reporting self-monitoring of wastewater treatment.keywords : self monitoring, database,DMBS, data update, and wastewater treatment plant

PERANCANGAN SISTEM KONTROL OTOMATIS AIR BAKU DAN AIR PRODUKSI PADA UNIT ARSINUM SMK AL-KAHFI KABUPATEN SUMBAWA Imam Setiadi
Jurnal Rekayasa Lingkungan Vol. 10 No. 2 (2017): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v10i2.2849

Air minum serta akses untuk mendapatkan air minum yang sehat menjadi kebutuhan dasar yang harus dipenuhi terutama di daerah-daerah yang rawan air. Daerah rawan air yang dimaksud adalah daerah yang sulit dijangkau atau tidak terjangkau sama sekali oleh layanan air bersih yang disediakan oleh Perusahaan Daerah Air Minum, dan secara geografis memang susah untuk mendapatkan sumber air yang baik. Adanya sarana penyediaan air siap minum sistem osmosa balik yang dikembangkan oleh Pusat Teknologi Lingkungan BPPT memungkinkan untuk diterapkan dilokasilokasi sulit air, dan dengan demikian masalah kesulitan air dapat teratasi. Hanya saja perlu pengelolaan yang baik, operator handal yang memungkinkan alat tersebut dapat beroperasiÂ dan berkesinambungan. Kemudahan dalam mengontrol, serta otomatisasi menjadi pertimbangan tersendiri terhadap kemudahan dalam pengoperasian alat tersebut. Pemilihan pompa-pompa, serta peralatan pengontrol tangki-tangki dipilih sedemikian rupa agar tidak menyulitkan masarakat ketika mencari suku cadangnya. Untuk mengontrol tangki-tangki air pada sarana Arsinum digunakan teknologi yang sederhana, yaitu radar untuk mengatur tinggi muka air. Sistem kontrol radar berharga murah, mudah dalam penerapanya dan jaminan ketersediaan suku cadangnya bahkan banyak di kota-kota kecil.Kata kunci : air minum, osmosa balik, radar, murah, mudah

OTOMATISASI TEKNOLOGI ULTRAFILTRASI KAPASITAS 5 M3/HARI, NAGARI SAGO SALIDO KABUPATEN PESISIR SELATAN SUMATERA BARAT Imam setiadi
Jurnal Rekayasa Lingkungan Vol. 11 No. 1 (2018): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v11i1.3024

Pemenuhan kebutuhan dasar berupa air bersih serta akses untuk mendapatkan air bersih yang sehat menjadi kebutuhan dasar yang harus dipenuhi terutama di daerah-daerah yang rawan air. Terutama daerah-daerah yang sulit dijangkauatau tidak terjangkau sama sekali oleh layanan air bersih yang disediakan oleh Perusahaan Daerah Air Minum, dan secara geografis memang susah untuk mendapatkan sumber air yang baik. Adanya sarana penyediaan air bersih sistemultrafiltrasi yang dikembangkan oleh Pusat Teknologi Lingkungan BPPT memungkinkan untuk diterapkan dilokasi-lokasi sulit air, dan dengan demikian masalah kesulitan air dapat teratasi. Hanya saja perlu pengelolaan yang baik, serta operator yang cakap, sehingga memungkinkan alat tersebut dapat beroperasi secara berkesinambungan. Kemudahan dalam menjalankan, serta otomatisasi menjadi pertimbangan tersendiri terhadap kemudahan dalam pengoperasian alat tersebut. Pemilihan pompa-pompa, serta peralatan pengontrol tangki-tangki dipilih sedemikian rupa agar tidak menyulitkan masarakat ketika mencari suku cadangnya. Untuk mengontrol tangki-tangki air pada sarana penyedia air bersih sistim ultrafiltrasi digunakan teknologi yang sederhana, yaitu radar untuk mengatur tinggi muka air serta twin timeruntuk produksi dan pencucian balik (backwash). Sistem kontrol radar dan twin timer berharga murah, mudah dalam penerapanya dan jaminan ketersediaan suku cadangnya bahkan banyak di kota-kota kecil. kata kunci : air bersih, ultrafiltrasi, otomatis, murah, mudah

PENGAMAN LAJU AIR UMPAN UNTUK ARSINUM KAPASITAS 5M3/HARI MENGGUNAKAN PRESSURE SWITCH DAN SELENOID VALVE Imam Setiadi
Jurnal Rekayasa Lingkungan Vol. 11 No. 2 (2018): Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jrl.v11i2.3442

Abstrak Dengan meningkatnya kebutuhan masyarakat terhadap air minum yangberkualitas dan kesadaran mengkonsumsi air minum yang sehat, banyak pulateknologi penyediaan air minum yang ditawarkan produsen kepada masyarakat.Mulai dari yang konvensional sampai dengan teknologi modern semuaditawarkan kepada masyarakat. Dari penyaringan biasa sampai denganpenyaringan membrane dengan disain sederhana ataupun dengan disain yangkomplek. Semua menjadi pilihan yang harus disesuaikan dengan kebutuhanmasyarakat. Penyediaan teknologi penyediaan air minum agar dapat beroperasidengan baik harus ada kontrol yang baik sehingga unit mesin penyedia air itudapat bekerja maksimal dan berkesinambungan. Kontrol pengaman aliran airumpan adalah salah satu contoh sistem kontrol pengaman yang dapat diterapkansecara mudah pada unit-unit tersebut dengan jaminan ketersediaan sukucadangnya yang bisa dibeli di kota-kota kecil. Sistem kontrol ini menggunakanpressure switch yang dikombinasikan dengan selenoid valve. Kombinasi inidengan melakukan pengaturan tekanan air akan mengamankan unit pengolahanair minum jadi unit ini tidak akan bekerja apabila tidak ada pasokan air.Kata kunci : air minum, kontrol, pressure swich, solenoid valve

Combined Multiple Attenuation Methods and Geological Interpretation : Seram Sea Case Study 2D Marine Seismic Data Tumpal Bernhard Nainggolan; Said Muhammad Rasidin; Imam Setiadi
BULLETIN OF THE MARINE GEOLOGY Vol 34, No 1 (2019)
Publisher : Marine Geological Institute of Indonesia

Multiple often and always appear in marine seismic data due to very high acoustic impedance contrasts. These events have undergone more than one reflection. This causes the signal to arrive back at the receiver at an erroneous time, which, in turn, causes false results and can result in data misinterpretation. Several types of multiple suppression have been studied in literature. Methods that attenuate multiples can be classified into three broad categories: deconvolution methods; filtering methods and wavefield prediction subtraction methods. The study area is situated on Seram Sea in between 131°15’E – 132°45’E and 3°0’S – 4°0’S, Seram Trough which is located beneath Seram Sea at northern part of the Banda-Arc – Australian collision zone and currently the site of contraction between Bird’s Head and Seram. This research uses predictive deconvolution and FK-filter to attenuate short period multiple from their move out, then continued by SRME method to predict multiple that cannot be attenuated from previous method, then followed by Radon transform to attenuate multiple that still left and cannot be attenuated by SRME method. The result of each method then compared to each other to see how well multiple attenuated. Predictive deconvolution and F-K filter could not give satisfactory result especially complex area where multiple in dipping event is not periodic, SRME method successfully attenuate multiple especially in near offset multiple without need subsurface information, while SRME method fails to attenuate long offset multiple, combination of SRME method and Radon transform can give satisfactory result with careful selection of the Radon transform parameters because it can obscure some primary reflectors. Based on geological interpretation, Seram Trough is built by dominant structural style of deposited fold and thrust belt. The deposited fold and thrust belt has a complexly fault geometry from western zone until eastern of seismic line.

GEOLOGICAL INTERPRETATION OF THE OFFSHORE SEDIMENTARY BASIN OF NORTH CENTRAL JAVA BASED ON SPECTRAL ANALYSIS AND 2D GRAVITY MODELING Restu Ningsih; Imam Setiadi; Riza Rahardiawan; Ordas Dewanto; Rahmi Mulyasari
BULLETIN OF THE MARINE GEOLOGY Vol 37, No 2 (2022)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.37.2.2022.788

The offshore sedimentary basin of North Central Java is a marine basin located in the northern part of North Serayu Basin. This basin was formed through the uplift of the southern part of Central Java (Bumiayu) caused by the movement of a pair of horizontal faults. Studies of sub-basin delineation and basement configuration are rarely carried out in this basin. Therefore, the gravity method referring to subsurface-density variations was carried out to obtain this information. This research aims to delineate sedimentary basins and interpret the geological subsurface based on gravity data using spectral analysis, highpass and lowpass filters, also 2D gravity modeling. An average estimation depth to the basement in the study area of about 2.22 km was determined using spectral analysis. Qualitative analysis shows the basement-high pattern, sub-basin, and structure lineament patterns. The 2D model shows three layers consisting of the upper sedimentary layer of Tertiary-Neogene and the middle layer of Tertiary-Paleogene sediment with a density value of 2.3 gr/cc and 2.5 gr/cc, respectively. The lower layer has the highest density of 2.67 gr/cc, assumed as a granitic basement. The results of the Second Vertical Derivative (SVD) analysis on the residual anomaly cross-sectional paths indicate the presence of thrust and normal faults which can be used to assist the interpretation of fault structures in subsurface geological models. Gravity analysis of the offshore North Central Java sedimentary basin indicates the occurrence of sub-basins and geological structure patterns that considered as a potential zone for the development of the petroleum system in this area.

SUBSURFACE GEOLOGICAL INTERPRETATION OF THE NORTH SUNDA ASRI BASIN BASED ON SVD ANALYSIS AND GRAVITY ANOMALY MODELING Hayu Nurfaidah; Imam Setiadi; Muhammad Sarkowi; Ordas Dewanto
BULLETIN OF THE MARINE GEOLOGY Vol 38, No 1 (2023)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.38.1.2023.833

The Sunda Asri Basin is dominated by normal faults and has little compressional structure. This basin consists of several depocenters with a thickness of up to 6000 m. Among the geophysical methods, gravity analysis has proven to be effective in determining the bedrock configuration and identifying sedimentary basins. This study aims to analyze sedimentary sub-basin patterns, basement height structures, faults, and bedrock configuration using trend surface analysis of polynomial filters. The analysis of polynomial filter show that a 10th-order anomaly yields optimal results. The high correlation value of 0.990925 provides the suitability of a 10th-order anomaly for qualitative interpretation. Spectral analysis results indicate an average bedrock depth of about 2.75 km within the Sunda Asri Basin. Furthermore, this analysis reveals the presence of 14 sedimentary sub-basin patterns in this area. The gravity modeling results indicate that the top layer has a density value of 2.37 g/cc, which interpreted as Pleistocene Tertiary sediment. The second layer consists of Tertiary-Miocene sediment with a density value of 2.28 g/cc, while the third layer comprises of Pre-Tertiary sedimentary rock at a density of 2.02 g /cc. The bottom layer of the model corresponds to metamorphic bedrock with a density 2.7 g/cc. SVD (Second Vertical Derivative) analysis successfully identified the presence of normal and thrust fault structures

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