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Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan
Published by Universitas Diponegoro
ISSN : 1907817X     EISSN : 25500023     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 12, No 2 (2015): September 2015" : 6 Documents clear
ORGANIC WASTE'S POTENTIAL AS RENEWABLE ENERGY AT SUPIT URANG LANDFILL IN MALANG CITY Saadiah, Riza; Hermawan, Hermawan; Hadiyanto, Hadiyanto
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (654.173 KB) | DOI: 10.14710/presipitasi.v12i2.71-77

Abstract

This research are to know the correlation of the number of population with the amount of waste inMalang city and biogas potential at Supit Urang landfill. Then also counting the percentage of biogaswhich has been used as gas fuel by citizens around the landfill and as electrical energy potency. Theaverage amount of waste in Malang city is 410,45 ton per day. Organic waste composition at SupitUrang landfill is 64,9% or in the average it’s about 137.989,57 kg per day. From that amount, theaverage of biogas which is produced is 19.146,57 m3 per day or about 574.397,05 m3 per month.Biogas utilization is for fuel gas by 408 houses near the location of that landfill, that’s about 18.385,19m3 per month or about 3,2%. Therefore that’s still has 96,8% biogas potential or about 556.011,86 m3per month which has not been utilized yet. That potency can produce electrical energy 2.613.255,75kWh per month or 3,63 MW. If the average efficiency level of conversion from biogas to electricity is35%, the electric potential become 914.639,51 kWh per month or as big as power station with energy1,27 MW
ANALISIS PENGOLAHAN AIR TERPRODUKSI DI WATER TREATING PLANT PERUSAHAAN EKSPLOITASI MINYAK BUMI (STUDI KASUS: PT XYZ) Andarani, Pertiwi; Rezagama, Arya
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (743.333 KB) | DOI: 10.14710/presipitasi.v12i2.78-85

Abstract

The exploration and production process of oil and its supporting operations always generates wasteas by-product. If they are uncontrolled, it might decrease the environmental quality. Thus, it isnecessary to manage and treat the waste in order to meet the regulation standard of quality andquantity. PT XYZ is an energy company, particularly oil and gas production, which its productionactivity generate a large amount of waste as well as produced water. Thus, PT XYZ must havefacilities or produced water handling plant which could minimize pollution caused by produced water.PT XYZ already has a system of produced water handling with recycling principle. After oil and waterseparation including water treating at Water Treating Plant (WTP), produced water will be used forsteam injection. This is the part of enhanced oil recovery by steam flooding in Duri Field. Besides,produced water could be used as backwash water at WTP, that is Oil Removal Filter (ORF) and WaterSoftener, which is called brine water. If the produced water and brine water is over load the capacity ofoil enhanced recovery injection, it might be disposed through injection to Disposal Well and there arecertain condition that produced water should be discharged into canal. The objective f this study is toanalyze the performance of a water treating plant in PT XYZ. Water Treating Plant is a facility fortreating produced water. Basically, WTP is on good condition and each unit has high efficiency forseparating oil and water (60-99%). Horizontal velocity at pit #A of API Separator was larger than thedesign criteria. In addition, Water Softeners have efficiency until 99% for the hardness.
ANALISIS KESESUAIAN PENGGUNAAN LAHAN PADA DAERAH RAWAN TANAH LONGSOR DI KABUPATEN TEGAL Gilang Rupaka, Anggun Prima; Suharyanto, Suharyanto; Sudarno, Sudarno
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (827.376 KB) | DOI: 10.14710/presipitasi.v12i2.52-56

Abstract

The frequency of landslides in Tegal regency increasing every year. The distribution area arealso more widespread, especially in districts Jatinegara, Bojong and Bumijawa. These regions has ahilly topography profile with a height ranging from 400 - 1200 meters above sea level. The landslide’sfactors that use as the parameters in this study are rainfall, slope, soil type, depth of soil solum andland use. Suitability of land use based on the level of vulnerability to landslides associated with thelevel of capacity and vulnerability, because the area that not conform based on these factors are theresidential area.The method used to calculate and analyze the landslide-prone area in this study are with thehelp of GIS. The software were used to analyze consist of ArcGIS 10, ER Mapper 7.0 and Basemap.Satellite images digitized with ArcGIS to produce maps of land use. Then the land-use maps overlaidwith maps of slope, soil type maps, rainfall maps and depth of solum. Predefined values for eachparameter were then summed and classified based on assessment standards. The landslidesusceptibility map is then used to analyze the suitability of land in landslide-prone areas in Tegalregency. The level of capacity and vulnerability to disasters in areas prone to landslides obtained byinterview in the form of a questionnaire.Subdistrict Jatinegara, Bojong and Bumijawa has an area of 25.000 hectares, 37,81% of thearea that included in the "Landslide Prone" category, while the 59.82% of the area goes into the"Pretty-Prone Landslide" category. Conversion of forest land into agricultural production into is the oneof the factors that aggravate the landslide that happened. Villagers who live in landslide-prone areasdo not have the awareness that cutting down trees and intensive agriculture are causing landslidesthat in their area, in addition to soil type and slope factors that dominant. Vulnerability and capacity tolandslides in the region included in the low category. Factors that influence are economic level,education level, living conditions and the condition of the access road. 
STRATEGI PRODUKSI PUPUK ORGANIK CAIR KOMERSIAL DARI LIMBAH RUMAH POTONG HEWAN (RPH) SEMARANG Oktiawan, Wiharyanto; Sarminingsih, Anik; Purwono, Purwono; Afandi, Mahfud
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (492.309 KB) | DOI: 10.14710/presipitasi.v12i2.86-94

Abstract

Limbah Rumah Pemotongan Hewan (RPH) Kota Semarang yang didominasi oleh rumen sapijika tidak diolah dapat menyebabkan ketidaknyamanan pada manusia dan kerusakan lingkungan.Dampak negatif dari limbah adalah proses pembuangan dan pembersihannya memerlukan biayaserta efeknya dapat mencemari lingkungan. Hal ini mendorong adanya inovasi dan pengembanganteknologi pengolahan air limbah yang murah dan mudah operasional dan pemeliharaannya sertabiaya yang sedikit. Upaya meningkatkan keuntungan akan keberadaan limbah dilakukan caramengolah limbah menjadi produk yang bermanfaat dan bernilai jual. Keuntungan yang bisa diperolehdari proses pengolahan limbah tersebut menjadi biogas, bioenergi, dan pupuk. Pupuk yangmengandung magnesium yang tinggi yang beredar di pasaran biasanya berbentuk granul/ serbuk.Apabila tanaman mengalami kekurangan magnesium maka akan menyebabkan kuningnya daun danmenghambat proses fotosintesis yang terjadi di daun.Penambahan limbah garam pada penelitian ini diharapkan dapat meningkatkan kandunganunsur hara makro C,N,P,K, dan Mg, tidak mencemari lingkungan, tidak merusak struktur tanah, sertamudah dalam pengaplikasiannya. Variasi rasio serat kasar dengan cairan rumen bertujuan untukmengetahui kandungan paling optimum,antara lain: 100:0 ,75:25 , 50:50 , 25:75 , 0:100 (seratkasar:cairan rumen). Hasil penelitian menunjukan bahwa penambahan limbah garam tidakmempengaruhi terhadap kandungan unsur hara C-Organik dan Nitrogen, sedangkan pada kandunganFospor, Kalium, dan Magnesium memiliki pengaruh dari penambahan limbah garam. Kandunganunsur hara makro paling optimum yaitu C-Organik pada fermentor B1 sebesar 1,44%, Ntotal padafermentor B2 sebesar 0,73%, Fospor (P2O5) pada fermentor B3 sebesar 2,243%, Kalium padafermentor B3 sebesar 13,05, dan Mg pada fermentor B3 sebesar 26,82%. Meskipun demikian, pupukorganik cair ini belum memenuhi persyaratan teknis Permentan No.70/Permentan/SR.140/10/2011tentang pupuk organik, pupuk hayati dan pembenah tanah
PENGGUNAAN TEKNOLOGI REAKTOR MICROBIAL FUEL CELLS (MFCs) DALAM PENGOLAHAN LIMBAH CAIR INDUSTRI TAHU UNTUK MENGHASILKAN ENERGI LISTRIK Purwono, Purwono; Hermawan, Hermawan; Hadiyanto, Hadiyanto
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (807.435 KB) | DOI: 10.14710/presipitasi.v12i2.57-65

Abstract

Microbial Fuel Cells (MFCs) adalah bioreaktor yang mengubah energi kimia dari senyawaorganik menjadi energi listrik melalui reaksi katalitik mikroorganisme dalam kondisi anaerob. Tujuandari penelitian ini adalah mengetahui pengaruh variasi media terlekat (attached growth media) danvariasi konsentrasi COD awal terhadap efisiensi penyisihan konsentrasi COD dan energi listrik yangdihasilkan. Reaktor MFCs didesain dalam bentuk dual-chamber yang dihubungkan menggunakanjembatan garam. Kerikil dan bioball digunakan sebagi variasi media lekat pada kompartemen anodadan konsentrasi limbah awal divariasikan dari 0%, 25%, 50%, dan 100% dari konsentrasi COD limbahcair industri tahu asli dengan cara melakukan pengenceran.Hasil penelitian menunjukkan bahwamedia lekat kerikil dengan konsentrasi 50% menghasilkan arus listrik rata-rata tertinggi 7,25 µA danenergi listrik sebesar 179,54 mWh. Voltase dan enegi listrik pada kedua variasi tersebut semakin harisemakin menurun. Variasi konsentrasi 25%, 50%, dan 100% menghasilkan penurunan nilai effisiensipenyisihan COD masing-masing 41,41%; 39,90% dan 18,26%.Pada variasi 100% menghasilkanenergi listrik lebih rendah dari pada 50%. Kemungkinan hal ini karena adanya senyawa sulfida yangberperan sebagai akseptor elektron. Pembentukan senyawa sulfida ditandai dengan terbentuknyawarna hitam pada substrat. Efisiensi coulombic (εC) akibat perbedaan media lekat dan variasikonsentrasi berada pada kisaran 0,001-0,035%. Rendahnya εC kemungkinan karena adanya produkproduk fermentasi dan biofilm pada elektroda anoda yang menghambat transfer elektron menujuelektroda anoda seperti biomassa, bahan organik terlarut, gas H2 dan gas CH4
STUDI OPTIMASI TAKAKURA DENGAN PENAMBAHAN SEKAM DAN BEKATUL Rezagama, Arya; Samudro, Ganjar
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 12, No 2 (2015): September 2015
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (613.958 KB) | DOI: 10.14710/presipitasi.v12i2.66-70

Abstract

Teknik pengomposan keranjang takakura telah banyak digunakan oleh rumahtangga di berbagai kota-kota besar di Indonesia. Pada sisi operasional terdapat kendalameliputi menurunnya efektifitas kinerja penguraian sampah organik sehingga seringterjadi kegagalan proses. Oleh karena itu, diperlukan suatu cara sederhana dalammeningkatkan kinerja porses pengomposan metode takakura. Secara garis besar,tahapan penelitian dibagi menjadi tahap persiapan, tahap pengomposan, dan tahappengolahan data. Penambahan sekam dan bekatul divariasikan ke dalam lima kotakkeranjang. Inokulum dalam komposter yang digunakan diambil dari keranjang milikmayarakat. Hasil penelitian menunjukkan penambahan sekam dan bekatul pada variasi3. 4, dan 5 belum menunjukkan hasil signifikan dalam meningkatkan kinerja inokulumseperti kotak 1. Temperatur inokulum baru masih di atas temperatur variasi/kotak yanglain. Hal ini disebabkan pada inokulum baru dimungkinkan masih terdapatmikroorganisme aktif serta sisa makanan dan sirkulasi udara yang baik. Namun jikadibandingkan satu persatu, penambahan sekam dan bekatul mampu menaikkantemperatur pada awal penelitian dibanding kotak 2 pada rata-rata proses. Penambahanbekatul dan sekam menyebabkan peningkatan rasio C/N. Namun, peningkatan rasio C/Ntidak serta merta membuat kotak 2, 3, dan 4 memiliki proses degradasi yang lebih baikdaripada inokulum baru yang ditandai dengan temperatur. Kandungan Karbon, Nitrogen,Phospor, dan Rasio C/N keseluruhan kompos matang telah memenuhi standar dalamSNI 19-7030-2004, standar internasional, dan Departemen Pertanian, tetapi masih belumsesuai dengan standar Departemen Pertanian dan PT. PUSRI

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