Articles

PENURUNAN LOGAM HG DALAM AIR MENGGUNAKAN SISTEM SUB-SURFACE FLOW CONSTRUCTED WETLAND: STUDI EFEKTIVITAS Puspitasari, Rikhanatul Firdausy; Prasetya, Agus; Rahayuningsih, Edia
Jurnal Rekayasa Proses Vol 13, No 1 (2019)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.332 KB) | DOI: 10.22146/jrekpros.39339

Abstract

A B S T R A C THigh amount of Mercury contamination is commonly found in traditional gold mining areas. This problem might occur due to the use of amalgamation process in traditional gold extraction process by dissolving the gold-bearing rocks with mercury (Hg). The utilization of mercury in gold mining activity has contaminated the water with Hg which might lead to serious health problems. This research was carried out by discharging the Hg-contaminated wastewater to enter a system called the Sub-Surface Flow Constructed Wetland (SSF-SW). The system employed a mixture of soil and the fibers of water hyacinth as the media on which Echinodorus palaefolius L. was planted. The wastewater containing HgCl2 at 8.59 mg/L was flown. The flow rate and pH were set to 6.3 L/hour and 6-7 pH at room temperature. Samples were collected at 0; 3.5; 7; 10.5 hours every day. The SSF-CW system was continually run for 10.5 hours and 13.5hour batch. The result of this research showed that the efficiency of Hg removal reached 92.79%. The results showed that the SSF-CW offers a stable system to reduce the mercury levels as shown in the growth of the plant and the total Hg removal efficiency. Plants with Hg exposure have distinct patterns of chlorosis. Some leaves turning yellow and die, others start with new growth. In addition, the growth of Echinodorus palaefolius L. was also influenced by the amount of nutrients in the soil.Keywords: Echinodorus palaefolius L., mercury, sub-surface flow constructed wetland A B S T R A KPencemaran merkuri banyak ditemukan pada penambangan emas tradisional. Pada umumnya proses yang diterapkan dalam penambangan emas tradisional dalam ekstraksi emas adalah proses amalgamasi, yaitu dengan cara mencampur bijih emas dengan merkuri (Hg). Aktivitas penambangan dengan memanfaatkan Hg menyebabkan tercemarnya air dengan Hg yang dapat membahayakan kesehatan. Penelitian ini dilakukan dengan cara mengalirkan air limbah Hg ke dalam sistem Sub-Surface Flow Constructed Wetland (SSF-CW). Media yang digunakan berupa campuran tanah dan serat eceng gondok serta ditanami dengan Echinodorus palaefolius L. Penelitian dilakukan dengan mengalirkan air limbah HgCl2 berkonsentrasi 8,59 mg/L. Percobaan menggunakan laju alir 6,3 L/jam dengan pH sekitar 6-7 pada suhu ruangan. Pengambilan sampel dilakukan pada jam ke 0; 3,5; 7 dan 10,5 pada setiap harinya. Operasi sistem SSF-CW dijalankan 10,5 jam kontinu dan 13,5 jam batch. Hasil penelitian menunjukkan efisiensi penurunan Hg sebesar 92,79%. Penelitian menunjukkan bahwa sistem SSF-CW cukup stabil. Kestabilan sistem SSF-CW dalam menurunkan kadar Hg dapat dilihat dari pertumbuhan tanaman dan total penurunan yang diperoleh. Tanaman yang terpapar Hg terlihat bercak klorosis. Beberapa daun menguning dan mati, sebagian lain tumbuh tunas baru. Pertumbuhaan Echinodorus palaefolius L. tidak lepas dari pengaruh unsur hara yang terdapat di dalam tanah.Kata kunci: Echinodorus palaefolius L., merkuri, sub-surface flow constructed wetland
KAJIAN DAMPAK LINGKUNGAN PADA SISTEM PRODUKSI LISTRIK DARI LIMBAH BUAH MENGGUNAKAN LIFE CYCLE ASSESSMENT Marendra, Fajar; Rahmada, Anggun; Prasetya, Agus; Cahyono, Rochim Bakti; Ariyanto, Teguh
Jurnal Rekayasa Proses Vol 12, No 2 (2018)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (752.488 KB) | DOI: 10.22146/jrekpros.36425

Abstract

A B S T R A C TProducing biogas by anaerobic digestion (AD) is a promising process that can simultaneously provide renewable energy and dispose solid waste safely. However, this process could affect environment e.g. due to greenhouse gas emissions. By life cycle assessment (LCA), we assessed the environmental impact (EI) of an integrated fruit waste-based biogas system and its subsystems of Biogas Power Plant Gamping. Data were collected from an actual plant in Gamping, Sleman, Yogyakarta, Indonesia that adopted a wet AD process at mesophilic condition. The results showed that the global warming potential (GWP) emission of the system reached 81.95 kgCO2-eq/t, and the acidification potential (AP), eutrophication potential (EP), human toxicity potential (HTPinf) and fresh water ecotoxicity (FAETPinf) emissions were low. The EI was mainly generated by two subsystems, namely, the electricity generation and the digestate storage. A comparison analysis showed that the GWP become the main contributor of environmental loads produced by Biogas Plant Gamping, Suazhou Biogas Model, Opatokun Biogas Model, Opatokun Pyrolisis Model, dan Opatokun Integrated System Anaerobic Digestion and Pyrolisis. The GWP impact control and reduction could significantly reduce the EI of the system. It has been shown that improving the technology of the process, the electricity generation and the digestate storage will result in the reduction of EI of the biogas system.Keywords: environmental impact; fruit waste; life cycle assessment (LCA); renewable energyA B S T R A KProduksi listrik dari biogas dengan anaerobic digestion (AD) merupakan proses yang menjanjikan karena dapat menghasilkan energi listrik dan penanganan limbah padat dengan aman. Namun, proses ini mempengaruhi lingkungan akibat emisi gas rumah kaca. Penilaian dampak lingkungan (environmental impact atau EI) sistem biogas berbasis limbah terpadu dan subsistemnya terhadap Biogas Power Plant Gamping (BPG) dilakukan dengan metode life cycle assesement atau LCA. Data dikumpulkan dari plant yang sebenarnya di Gamping, Sleman, Yogyakarta, Indonesia yang mengadopsi proses AD basah pada kondisi mesofilik. Potensi pemanasan global (global warming potential atau GWP) dari sistem mencapai 81,95 kgCO2-eq/t, sedangkan potensi keasaman (acidification potential atau AP), potensi eutrofikasi (eutrophication potential atau EP), potensi toksisitas manusia (human toxicity potential atau HTPinf) dan ekotoksisitas air (fresh water ecotoxicity atau FAETPinf) potensi emisinya cukup rendah. Potensi EI terutama dihasilkan oleh dua subsistem, yaitu, pembangkit listrik dan penyimpanan digestate. Analisis perbandingan menunjukkan bahwa dampak GWP menjadi kontributor utama dari beban lingkungan yang dihasilkan oleh Biogas Plant Gamping, biogas model Suazhou, biogas model Opatokun, model pirolisis Opatokun, serta model integrasi AD dan pirolisis Opatokun. Pengendalian dan pengurangan dampak GWP secara signifikan dapat mengurangi EI dari sistem. Telah terbukti bahwa peningkatkan teknologi proses, pembangkit listrik dan penyimpanan digestate akan menghasilkan pengurangan EI dari sistem biogas.Kata kunci: dampak lingkungan; energi terbarukan; life cycle assessment (LCA); limbah buah
RECOVERY ION HG2+ DARI LIMBAH CAIR INDUSTRI PENAMBANGAN EMAS RAKYAT DENGAN METODE PRESIPITASI SULFIDA DAN HIDROKSIDA Fadlilah, Ilma; Prasetya, Agus; Mulyono, Panut
Jurnal Rekayasa Proses Vol 12, No 1 (2018)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.969 KB) | DOI: 10.22146/jrekpros.34496

Abstract

Unlicensed gold mining activities using mercury (Hg) as a gold element binder is called the amalgamation process. Mercury is a heavy metal and categorized as toxic material. The use of mercury can potentially cause a pollution in environment, especially the aquatic system. For overcoming the heavy metals of mercury in liquid waste, it needs an alternative wastewater treatment method e.g. chemical precipitation. This study is aimed to recover Hg2+ ions from liquid wastes by using sulphide precipitation and hydroxide methods. This research studied the effect of pH on Hg2+ ions which is deposited in the precipitation process and evaluated the rate of Hg2+ precipitation formation. Precipitation was carried out by using sodium sulphide (Na2S) 0.3 M and Ca(OH)2 0.004 M as a precipitation agent with a rapid mixing speed for about 200 rpm for 3 minutes and continued with slow mixing for about 40 rpm for 30 minutes. Then, the liquid sample was left for 24 hours to precipitate. The results showed that precipitation method by using Na2S solution can decrease the content of Hg in HgCl2 synthetic waste. Optimum mass of HgS precipitate of 0.046 g was achieved at pH 9 with a removal efficiency percentage up to 99.81%. The rate of formation of HgS precipitate is 0.4mg/ hour. While, hydroxide precipitation method can decrease mercury level up to 90.11% at pH 12 and mass of Hg (OH)2 precipitate obtained is 0.28 g. However, the result of EDX analysis of the precipitate of Hg (OH)2 showed that the content of Hg precipitate is still low at 0.28 wt.%. A B S T R A KKegiatan penambangan emas rakyat tanpa izin (PETI) dengan menggunakan merkuri (Hg) sebagai pengikat unsur emas disebut proses amalgamasi. Merkuri merupakan logam berat yang bersifat racun. Penggunaan merkuri ini berpotensi menimbulkan pencemaran di lingkungan sekitar, terutama lingkungan perairan. Untuk penanganan logam berat merkuri dalam limbah cair ini, maka diperlukan sebuah metode pengolahan limbah alternatif, yaitu metode presipitasi kimia. Penelitian ini bertujuan untuk me-recovery ion Hg2+ dari limbah cair dengan metode presipitasi sulfida dan hidroksida. Selain itu mempelajari pengaruh pH terhadap ion Hg2+ yang terendapkan dalam proses presipitasi dan mengetahui laju pembentukan endapan Hg. Presipitasi dilakukan dengan menggunakan natrium sulfida (Na2S) 0,3 M dan Ca(OH)2 0,004 M sebagai agen presipitan dengan pengadukan cepat 200 rpm selama 3 menit dan dilanjutkan dengan pengadukan lambat 40 rpm selama 30 menit. Larutan sampel didiamkan selama 24 jam untuk mengendapkan presipitat yang terbentuk. Hasil penelitian menunjukkan bahwa metode presipitasi menggunakan larutan Na2S dapat menurunkan kadar Hg pada limbah sintetik HgCl2. Massa endapan HgS optimum sebesar 0,046 g larutan dicapai pada pH 9 dengan persentase efisiensi penyisihan hingga 99,81 %. Laju pembentukan endapan HgS diperoleh sebesar 0,4 mg/jam. Sedangkan metode presipitasi hidroksida dapat menurunkan kadar merkuri hingga 90,11% pada pH 12 dengan massa endapan Hg(OH)2 yang diperoleh adalah 0,28 g. Akan tetapi hasil analisis EDX endapan Hg(OH)2 memperlihatkan bahwa kandungan Hg dalam endapan tersebut masih sangat kecil yaitu sebesar 0,28%.
PENGARUH JENIS LIMBAH DAN RASIO UMPAN PADA BIOKONVERSI LIMBAH DOMESTIK MENGGUNAKAN LARVA BLACK SOLDIER FLY (HERMETIA ILLUCENS) Muhayyat, Mahfudl Sidiq; Yuliansyah, Ahmad Tawfiequrrahman; Prasetya, Agus
Jurnal Rekayasa Proses Vol 10, No 1 (2016)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.252 KB) | DOI: 10.22146/jrekpros.34424

Abstract

The high content of protein is the main reason for domestic waste to be potentially processed by bioconversion using Hermetia illucens larvae. Hermetia illucens larva can accumulate protein content as high as 45-50% and fat which reaches 24-30%, so that it becomes a good source of highly nutritious feed. This research studied the production of Hermetia illucens larvae through bioconversion process on rice waste, cassava leaf, and mixed rice-cassava leaf (with the weight ratio of 1: 1), by varying the feed rate of 60, 80, and 100 mg/larva/day. The experiment was conducted for 21 days. Samples were taken periodically to be analyzed for their weight, substrate consumption, and waste reduction index. Proximate analysis was conducted on raw material and larvae media. The results of this study indicated that the optimum waste for larvae was the mixed rice-cassava leaf waste with feed rate of 60 mg/larva/day or total weight of 10.00 grams per feeding. At this condition, the optimal waste reduction in the bioconversion process was observed as substrate consumption of 65.82% and the waste reduction index of 18.02%. ABSTRAKTingginya kandungan protein membuat limbah domestik berpotensi untuk diproses secara biokonversi dengan menggunakan larva Hermetia illucens. Larva Hermetia illucens memiliki kandungan nutrisi protein yang mencapai 45-50% dan lemak yang mencapai 24-30%, sehingga dapat dijadikan sumber pakan bernutrisi tinggi. Penelitian ini mempelajari produksi larva Hermetia illucens melalui proses biokonversi pada limbah nasi, daun singkong dan campuran nasi-daun singkong (1:1), dengan memvariasikan feed rate sebesar 60, 80, 100 mg/larva/hari. Penelitian dilakukan selama 21 hari, dengan menganalisis berat larva, substrate consumption, dan waste reduction index. Analisis proksimat dilakukan pada media pakan dan larva. Hasil penelitian ini menunjukan bahwa limbah yang paling optimal memproduksi larva dalam proses ini adalah limbah campuran nasi-daun singkong dengan feed rate 60 mg/larva/hari atau dengan berat total 10,00 gram per feeding. Reduksi limbah paling optimal pada proses biokonversi teramati sebagai nilai konsumsi substrat sebesar 65,82% dan waste reduction index sebesar 18,02%.
PENJERAPAN ION LOGAM CADMIUM DALAM LARUTAN ENCER MENGGUNAKAN BAGGASE FLY ASH TERAKTIVASI Helsanggi, Martha; Prasetya, Agus
Jurnal Rekayasa Proses Vol 4, No 1 (2010)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.852 KB) | DOI: 10.22146/jrekpros.569

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Bagasse fly ash (BFA) dapat digunakan sebagai adsorben berbagai macam logam berat seperti Cd2+ yang terlarut dalam air. Untuk dapat digunakan sebagai media penjerap BFA perlu lebih dahulu diaktivasi. Penelitian mempelajari pengaruh berbagai jenis aktivasi terhadap kemampuan adsorpsi BFA belum banyak dilakukan. Pada penelitian ini BFA diaktivasi menggunakan larutan HCl 1N dan H2O2 pada berbagai konsentrasi 0,01N, 0,02N, dan 0,05N. BFA teraktivasi kemudian digunakan untuk menjerap Cd2+. Pada penelitian ini juga dipelajari pengaruh suhu terhadap jumlah Cd2+ yang teradsorpsi. Hasil penelitian menunjukkan bahwa kualitas BFA teraktivasi H2O2 lebih baik dibandingkan BFA awal. Sementara itu, aktivasi dengan larutan HCl menyebabkan penurunan kualitas penjerapan. Hasil penelitian menunjukkan bahwa semakin tinggi suhu maka semakin sedikit Cd2+ yang terjerap. Kata kunci: bagasse fly ash, penjerapan, aktivasi, H2O2, ion kadmium Bagasse fly ash is frequently used as an adsorbent for various heavy metals such as Cd2+ dissolved in water. Activation procedure is generally required preceding adsorption using BFA. Investigation of different activation treatments and the influences on BFA adsorption capacity is still scarce. In the present study, BFA was activated in HCl 1 N solution and in H2O2 solution at different concentrations of 0.01 N, 0.02 N and 0.05 N. The activated BFA was then used for adsorption of water containing Cd2+. Also, the effect of temperature on the adsorption was part of the study. Experimental results indicated that H2O2 activated BFA showed superior adsorption properties compared with the unmodified BFA (raw BFA). Meanwhile, activation treatment in HCl solution caused a decrease in adsorption quality. The results also showed that temperature increase would lead to a decrease in adsorption capacity. Keywords: bagasse fly ash, adsorption, activation, H2O2, ionic cadmium
PENGARUH KONSENTRASI POLIFENOL PADA PRODUKSI ASAM LAKTAT DARI SUBSTRAT MENGGUNAKAN RHIZOPUS ORYZAE Nugraha, Maulana Gilar; Syamsiah, Siti; Prasetya, Agus
Jurnal Rekayasa Proses Vol 9, No 1 (2015)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (377.261 KB) | DOI: 10.22146/jrekpros.24527

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Polyphenol is antioxidant compound naturally present in plants e.g in cacao shell (Thebrema cacao L.). The cacao shell has high cellulose content (30-50%), and therefore it is potential to be converted into various types of products. Cellulose could be hydrolyzed to produce glucose, and glucose could be fermented to become lactic acid. However, polyphenol presence in the cacao shell is suspected to be inhibitory to fermentation process. This research aimed to figure out the polyphenol effect in lactic acid fermentation with glucose as substrate by the fungus Rhizopus oryzae. Polyphenol concentrations in the fermentation broth were varied with value of 0, 10, 15, and 20 g/L. Along the course of the experiment, lactic acid concentration was measured by means of gravimetric and conductometric method. Fungus growth was measured through dry mass method while consumption of glucose was observed by glucose determination with Nelson-Samogyi method. The results showed that polyphenol presence in fermentation system would decrease lactic acid production from 40.55 g/L (system without polyphenol) to 18.24 g/L (system with 20 g/L polyphenol). Microbe growth inhibition also observed from 3.68 g/L (system without polyphenol) to 0.51 g/L (system with 20 g/L polyphenol). However, polyphenol presence did not affect the total glucose consumption. Final glucose concentrations in all system were about 10.94 to 19.28 g/L. Some possible factors for this phenomenon were glucose conversion to another product and glucose utilization for cell maintenance. This research also found that the best kinetic model to represent the fermentation system was uncompetitive inhibition model. Keywords: fermentation kinetics, inhibitor, polyphenol, cacao Kulit buah cokelat (Theobrema cacao L.) merupakan salah satu limbah perkebunan dengan kandungan selulosa yang relatif tinggi (30-50%) yang berpotensi sebagai bahan baku berbagai produk. Selain itu, kulit buah cokelat juga mengandung polifenol sebagai antioksidan dalam jumlah yang relative besar. Selulosa dapat dihidrolisis menjadi glukosa dan hasil hidrolisis tersebut dapat difermentasi menjadi asam laktat. Namun keberadaan polifenol dalam kulit kakao berpotensi menghambat proses fermentasi selulosa. Penelitian ini bertujuan untuk mempelajari pengaruh polifenol terhadap fermentasi asam laktat dengan bahan baku glukosa menggunakan Rhizopus oryzae. Variasi konsentrasi polifenol yang digunakan adalah 0, 10, 15, dan 20 g/L dalam cairan fermentasi. Sepanjang penelitian konsentrasi asam laktat dianalisis dengan metode gravimetri dan konduktometri. Konsentrasi mikroba diukur dengan menggunakan metode berat kering sedangkan pengukuran konsentrasi glukosa menggunakan metode Nelson-Samogyi. Hasil penelitian menunjukkan bahwa semakin tinggi konsentrasi polifenol dapat menurunkan produksi asam laktat dari 40,55 g/L (sistem tanpa polifenol) menjadi 18,24 g/L (sistem dengan 20 g/L polifenol). Pertumbuhan mikroba pun mengalami penurunan dari 3,68 g/L (sistem tanpa polifenol) menjadi 0,51 g/L (sistem dengan 20 g/L polifenol). Walaupun demikian, konsumsi glukosa tidak terlalu dipengaruhi oleh penambahan polifenol. Nilai konsentrasi akhir glukosa sistem pada berbagai variasi polifenol berkisar 10,94 s/d 19,28 g/L. Hal ini kemungkinan disebabkan oleh terkonversinya glukosa menjadi produk samping lain dan alokasi untuk maintenance sel. Penelitian ini menyimpulkan bahwa model kinetika yang dapat merepresentasikan sistem ini dengan baik adalah model uncompetitive inhibition. Kata kunci: kinetika fermentasi, inhibitor, polifenol, kakao
PENGURANGAN ZAT WARNA REMAZOL RED RB MENGGUNAKAN METODE ELEKTROKOAGULASI SECARA BATCH Setianingrum, Novie Putri; Prasetya, Agus; Sarto, Sarto
Jurnal Rekayasa Proses Vol 11, No 2 (2017)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (476.232 KB) | DOI: 10.22146/jrekpros.26900

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Batik is one of the distinctive cultural chacteristic of the Indonesian national that has gained recognition from UNESCO. Batik industries have grown rapidly. However, the activity  industry produces liquid, especially from batik?s dyeing processes.. The conventional method which is used for processing wastewater still has limitation so that an innovation method wastewater treatment is need for example electrocoagulation. Electrocoagulation is  a process of coagulation using unidirectional electrics current through electro-chemical process. In this work, electrocoagulation was employed to treat wastewater (synthetic dyes remazol red (Rb) as wastewater model). The method was carried out by varying the distance between electrode distance and electrical voltage. Variation of distance between electrode range were  2 cm and 3 cm while variation of electrical voltage range were 10 volt and 15 volt. To determine the effect of electrode distance and electrical voltage on treatsment performances the chemical oxygen demand(COD), total suspended solid (TSS) and waste color. The samples were taken at 10 minutes, 20 minutes, 40 minutes and 60 minutes during the process. The results showed that the distance of the electrode and the voltage affected  to thr reduction of COD, TSS and waste color. The optimum elecrode distance and voltage in this research were 2 cm and 10 volt. The research showed the decrease in COD concentration from 428 mg/L to 54 mg/L, TSS concentration from 850 mg/L to 277 mg/L and the decrease in waste color from 2733 PtCo to 75,5 PtCo. ABSTRAKBatik merupakan salah satu ciri budaya khas bangsa Indonesia yang telah mendapatkan pengakuan dari UNESCO. Industri batik mengalami pertumbuhan cukup pesat. Aktivitas produksi dalam industri semakin meningkat menyebabkan limbah cair terutama dari proses pewarnaan semakin banyak. Metode konvensional untuk pengolahan limbah cair masih memiliki kekurangan sehingga memerluka metode pengolahan limbah alternatif, yaitu metode elektrokoagulasi. Proses elektrokoagulasi merupakan suatu proses koagulasi  dengan menggunakan arus listrik searah melalui proses elektrokimia. Proses elektrokoagulasi dilakukan dengan memvariasikan tegangan listrik dan jarak antar elektroda yaitu 10 volt dan 15 volt serta 2 cm dan 3 cm. Untuk mengetahui pengaruh tegangan listrik dan jarak antar elektroda maka dilakukan pengukuran COD, TSS dan Warna dimana sampel diambil setiap 10 menit, 20 menit, 40 menit dan 60 menit lalu dianalisis. Hasil penelitian menunjukkan bahwa tegangan listrik dan jarak antar elektroda memberikan pengaruh terhadap penurunan COD, TSS dan Warna pada limbah cair sintetis Remazol Red RB. Jarak antar elektroda dan tegangan listrik yang optimum pada penelitian ini yaitu 2 cm dan 10 volt dengan penurunan konsentrasi COD yang pada awalnya 428 mg/L menjadi 54 mg/L, penurunan TSS yang pada awalnya 850 mg/L menjadi 277 mg/L dan penurunan Warna yang pada awalnya sebesar 2733 PtCo menjadi 75,5 PtCo.
Model Promosi Nonpendas melalui Reach Approach sebagai Upaya Meningkatkan Mahasiswa Baru Prasetya, Agus; Malik, Abdul
Widya Warta No. 02 Tahun XXXVII /Juli 2013
Publisher : Jurnal Online Unika Widya Mandala Madiun

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Abstract

Promotion  is  an  activity  to  offer  goods  and  services  produced  by  an  institution, factory, or company in order to be recognized by the public. Related to Open University, this promotion will persuade the public to improve their labour productivity by joining Open University. One of promotion methods used is Reach Approach Communication (respect, empathy, audible, clarity, and humble). The  decrease  of  students  can  be  caused  by  less  promotion  in  regions,  especially Madiun regency. The main purpose of promotion is persuading the customers so they will recognize, be interested in, and finally use the product. While, mixed promotion means a promotion with various kinds of way in order to make the people customers. This research is aimed to offer an effective method of promotion so as to increase the new students participation number (APM). This research is qualitative in nature and the source of data is civil servants, students, education observers, and teachers in Madiun. The data  were  collected  through  interviews,  and  documents.  The  data  analysis  was  done  by making use of Huberman and Miles’ analysis method. The analysis showed that there was an increase of 80% of Non Pendas students in Madiun as the effect of the application of the mixed promotion Reach Approach.
Tokoh Bambang Ekalaya dan Moralitas Pendidikan PRASETYA, AGUS
RESITAL : JURNAL SENI PERTUNJUKAN Vol 9, No 1 (2008): Juni
Publisher : Institut Seni Indonesia Yogyakarta

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Abstract

Bambang Ekalaya and The Education Morality. Si Bambang Ekajaya is a story that is produced from theeducation morality condition that is growing in society at this time, and than commuted be a play manuscript story,it means that the appraise these are justifi cation and contraction. It can also be said as criticism what are looked andheard as a respond. The creation of Si Bambang Ekajaya used inter-textual theory, which inter-textual theory is tofi nd some aspects which have already exist in the works before, which appears more in the text. From some aspects,inter-textual principle can also be connected to literature work reception.
Pemodelan matematis pengurangan COD dalam air limbah industri penyamakan kulit secara adsorpsi kontinyu menggunakan abu terbang bagas Prasetya, Agus; Sarto, Sarto; Sholeh, Muhammad
Majalah Kulit, Karet, dan Plastik Vol 29, No 1 (2013): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.475 KB) | DOI: 10.20543/mkkp.v29i1.214

Abstract

ABSTRACTThe objective of this research was to obtain suitable mathematical model for ChemicalOxygen Demand (COD) removal originated from tannery wastewater using bagasse fly ash incontinuous system. In the column experiment, effect of flowrate, concentration of wastewater,and bulk density were studied. Three models: Adams-Bohart, Thomas, and Yan were applied toexperimental data to predict the breakthrough curve. The best model was evaluated usingcorrelation coefficients. Yan model was found to give the most accurate to describe dynamicbehavior of the column experiment. The best result was obtained at flowrate of 100 mL/min,concentration of 400 mg/L, and bulk density of 61 g/L. The Yan kinetic constant (k ) and the Yadsorption capacity (q ) were 0.3210 mL/mg/min and 17.0947 mg/g respectively and the Ycorrelation coefficient obtained was 0.9379.Keywords: Chemical Oxygen Demand, tannery wastewater, bagasse fly ash, adsorptionABSTRAKpengurangan COD dalam air limbah industri penyamakan kulit mengunakan abu terbang bagassecara kontinyu. Variasi percobaan adsorpsi dalam kolom yang dilakukan yaitu: kecepatan aliranair limbah, konsentrasi air limbah, dan bobot isi. Persamaan Adams-Bohart, Thomas, dan Yandiaplikasikan ke data percobaan untuk memprediksikan kurva breakthrough. Koefisien korelasidigunakan untuk mengevaluasi model terbaik. Proses pengurangan COD dengan abu terbangbagas secara kontinyu dalam kolom paling cocok dimodelkan dengan model Yan. Hasil terbaikdiperoleh pada kecepatan aliran air limbah 100 mL/menit, konsentrasi air limbah 400 mg/L, danbobot isi 61 g/L. Parameter konstanta kinetika (k ) dan kapasitas adsorpsi (q ) yang diperoleh Y Yberturut-turut sebesar 0,3210 mL/mg/menit dan 17,0947 mg/g dengan nilai koefisien korelasiyang didapatkan yaitu 0,9379.Kata kunci: Chemical Oxygen Demand, air limbah industri penyamakan kulit, abu terbang bagas,adsorpsi
Co-Authors Abdul Malik Agus Aktawan, Agus Agustina, Ulan Paluti Ahmad Tawfiequrrahman Yuliansyah, Ahmad Tawfiequrrahman Alfiana Adhitasari Ambar Pertiwiningrum Arif Rahman Hakim Armaidy Armawi Astri Senania, Astri Awaluddin Nurmiyanto, Awaluddin Bengt Andersson Bidhari Pidhatika, Bidhari Brian Hayden Cahyono, Muhammad Sigit Cahyono, Rochim Bakti Cahyono, Rochim Bakti Cahyono, Rochim Bakti Edhi Martono Edia Rahayuningsih Endang Tri Wahyuni Ependi, Deden Erna Astuti Fadlilah, Ilma Fadlilah, Ilma handoyo, haries Hary Sulistyo Herry Purnomo I Made Bendiyasa Indra Perdana Krister Ström Kusuma Dewi, Indah Noor Dwi Lestari, Rizka Liestiono, Maria Ratih Puspita Marendra, Fajar Marendra, Fajar Martha Helsanggi Mudjijana - Muhammad A. A. Ramadhan, Muhammad Muhammad Arman Muhammad Hidayat Furqon MUHAMMAD SHOLEH Muhayyat, Mahfudl Sidiq Muhayyat, Mahfudl Sidiq mulhidin, mulhidin Nugraha, Maulana Gilar Nugraha, Maulana Gilar Panut Mulyono Petrus, Himawan T. B. M. Petrus, Himawan T.B.M Prameswara, Gyan Puspitasari, Rikhanatul Firdausy Radwinda Kurnia Putri Rahmada, Anggun Rahmada, Anggun Rahmawati, Merza Rakhmasari, Kirana Dipta Rima Dewi Anggraeni, Rima Dewi Rizki Laksono, Rizki Rochmadi Rochmadi Ruslim Budianto Sarto Sarto Satria, Arysca Wisnu Setianingrum, Novie Putri Setianingrum, Novie Putri Sihana - Siti Syamsiah Supranto - Supranto Supranto Syamsiro, Mochammad Teguh Ariyanto Trisnawati, Iga Wahyu Wilopo Widi Astuti WIDODO - Wira Widyawidura, Wira Yuliansyah, Ahmad T Yusuf, Ilma Fatimah