METANA
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Articles 137 Documents
Penerapan Produksi Bersih pada Proses Painting Steel Sebagai Upaya Minimasi Limbah (Studi Kasus Pada Industri Perakiton Sepeda Motor)

Priyambada, Ika Bagus ( Jurusan Teknik Lingkungan Fakultas Teknik Universitas Diponegoro )

METANA Volume 3 Nomor 1 Juli 2006
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Abstract

Abstract   Painting Steel process in some automotive industries uses Spray methode, but this methode produce more liquid waste and solid waste. Waste minimization that can be done by Cleaner Production through implementation of Cotionic Electro Deposition (CED) methode. This methode has a purpose to reduce liquid waste and solid waste to achieve minimum environmental effects. After a comparization beetwen Spray methode and CED methode based on the amount of production, paint consumption, watter consumption, electrical consumption, man power consumption ond waste from the production, the result is CED methode has more economical benefit as much as Rp 556.736. 178,00/month. This analyz  doesnt  snatch investment.   Key words : Cleaner Production, Spray methode, CED methode, saving  

REPAIR OF PROCESS EXTORTION OF CENTRIFUGAL OIL AND ADJUSMENT OF TECHNOLOGY IS PRECISELY UTILIZE AT INDUSTRY CHIPS EMPING GEPUK MELINJO DI KABUPATEN BATANG

Abidin, Zainal ( Jurusan Teknik Kimia PSD IlI Teknik, UNDIP Semarang Jl. Prof Sudarto SH Pedalangan Tembalang, Semarang 50239 )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract At the industry produce the chips emping gepuk melinjo conventional generally experience of the resistance at process extortion of oil because this process walk gravitationly with extortion time about 0.5 hour. Problems of arising out is oil conten in chips emping gepuk melinio still high about 15 %  is while equipments of extortion of oil which have is not yet can operate in an optimal fashion ( leak is in gravitation with time of 30 minute).  is so that needed by the equipments able to improve ; repair the process extortion of oil in chips emping gepuk melinjo fry. This matter will pursue in improvement of capacities produce the chips emping gepuk melinio. To increase product to be needed modify, equipments of extortion of oil,  so that efiensi production can be boasted up and peaceful for the use it and also improve the chips emping product qualitv gepuk. As according to the clauses released by Departemen Kesehatan, oil content in food stuff fried by is less than 5%. because at high oil rate will quicken the process rancidity at food-stuff. Besides with high oil rate will be able to improve the cholesterol rate in blood. From the result of perception during extortion by centrifugal oil wringer, extortion time about 2 - 3 minute with oil content in chips emping gepuk under or less than 5 %, so that the result of chips emping gepuk yielded by seen drier and will improve the endurance.   Keyword : Chips emping gepuk melinjo, centrifugal wringer,oil rate and extortion time.

REKAYASA BIOKONVERSI LIMBAH CAIR INDUSTRI PANGAN MENJADI PLASTIK BIODEGRADABLE DENGAN MENGGUNAKAN LUMPUR AKTIF

Wikanta, Deddy Kurniawan ( Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH. Pedalangan Tembalang, Semarang 50239 ) , Yulianto, Mohamad Endy ( Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH. Pedalangan Tembalang, Semarang 50239 ) , Arifan, Fahmi ( Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH. Pedalangan Tembalang, Semarang 50239 )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract Plastics waste has a negative effect on our environment. one effort to solve a  problem exerted in plastic waste is by making a degradable plastic material. Polihidroksialkanoat (PHA) is one of biodegradable plastic material which is include in the polyester group. PHA can be completely degraded and has  similar properties. with conventional plastic. The usage of liquid food industry waste is a good alternative for the production of PHA, since liquid waste of food industry comprise of organics substance such as C, H, O, N and  S. The production of Polihidroksialkanoat (PHA) from liquid waste of flour industry, wasconducted in a of sequencing batch reactor (SBR).The objectives  of this research are to study the effect of batch time in one cycle of sequencing batch reactor(SBR), to compare between short and ordinary cycle in SBR system to PHA accumulation and kind of PHA, to study optimum condition of producing PHA. The first experimen was done In time of less than 12 hours by using filling time  variable and ratio of duration of Aerob and anaerob process. The constand conditions were ambient temperature and neutral pH (at the begining). The results shows that at running with time ratio of aerob:anaerob was 6:3 hours and a  same duration of  feeding, the highest average PHA content was got at the run when filling step is in six hours anaerob with aerob breaking time. The feeding duration  also influence the PHA formation. the short feeding duration yielded the highest average PHA content. An average PHA 0.1838 g/gsel was yielded at two hours feeding duration   Key Words :biodegradable:plastic:waste    

PENGEMBANGAN PIRANTI LUNAK SISTEM PROSES BERSIFAT USER FRIENDLY DENGAN SCILAB (Open Source Software)

Sasongko, Setia Budi ( Teknik Kimia Fak. Teknik UNDIP )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract Requirement of software is necessary for the process system-computer simulation. ln reality, costly of software is one of restriction for the software development. However, the costly constraint can be solved using open source software such as Scilab and OpenOffice. The goa lof this article formulates user friendly program of the process system. Scilab program by Graphical User Interface (GUI) and interaction with Open Office-Cale for the data-base physical property. Scilab program has been listed in this article and algorithme of rhe program as the methodology has been presented in this article. Results of the simulation program indicate goodfinding for the process system.   Kata kunci : scilab; open office, simulasi komputer; oss (open source sortuare), Antar Muka Pcngguna - Graphical User Interface (GUI).

MATHEMATICAL MODEL OF GAULTHERASE INACTIVATION KINETICS FOR THE GAULTHERIN PRODUCTION FROM WINTERGREEN (Gaulteria fragantissima)

Yulianto, Mohamad Endy Y ( Jurusan Teknik Kimia PSD III Teknik, UNDIP, Semarang ) , Hartati, Indah ( Jurusan Teknik Kimia Universitas Wahid Hasyim Semarang ) , yuniastuti, Ari ( Jurusan Biologi FMIPA Universitas Negeri Semarang )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract Wintergreen (Gaultheria fragantissima) is the source of the essential oil of wintergreen which is comprised predominantly of methyl salicylic. During this time wintergreen is not yet economically developed because of the lack of the cultivation technology. One of effort that is needed to be studied beside the cultivation tecnology and  the wintergren oil quality development is the product diversification. wintergreen comprised by far the highest concentration of both free salicylic and total salicylic acid which is expected of a plant known for the formation of the wintergreen oil, an essential oil consisting primarily of methyl salicylic. The concentration of total salicylate found in wintergreen is over 20 fold greater than the total salicylic concentration (salicylic and any derivates combined) found in Filipendula, and 100 fold greater than that found in Lemon Thyme. The active form of salicylic acid in wintergreen is Gaultherin. Gaultherin has many properties related to human health. Gaultherin consists of methyl salicylic conjugated to the disaccharide, primeverose. When plant tissues are disrupted the endogenous gaultherin is rapidly lost, presumably by enzymatic hydrolysis with the release of methyl salicylic. The problem is until this time there is not yet available an effective method for the gaultherin extraction. The difficulties faced on the gaultherin production are the fact that along the gaultherin extraction. and along with the disruption of the wintergreen tissue, the gaultherin is hydrolyzed into its individual components which are methyl salicylic and disaccharide. The alternative process for the gaultherin production from wintergreen is the gaultherin production process by enzyme inactivation and  extraction process in an inactivation extractor using a n organic solvent (alcoholic solvent extraction). This paper is intended to study the enzyme inactivation rate which is play an important role in the dimension determination of the process equipments. Enzyme inactivation can be describes as first orde reaction. The enzyme inactivation constant  kp is the temperature, pressure, and water concentration function. The dependency, model of  the temperature based on Arhenius type while the pressure dependency  is based on Eyring equation.   Keywords : gaultherin, inactivation. kinetics

SISTEM PENGOLAHAN LIMBAH GAS CIANIDA PADA INDUSTRI PESTISIDA STUDI KASUS PT. ALFA ABADI PESTISIDA - JAWA BARAT

Supriyo, Edy ( Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH, Pedalangan Tembalang, Semarang 50239 )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract   Pesticide industries produce substance to kill pest and weeds, therefore product,side product, raw  material and its wastes are hazardous and poison. The main pollution from pesticides industries are air pollutant. According to property of the wastes, treatment wastes include combination of absorbtion, catalytic and condensation order to match with limiting value by government. After being treated, the component moritored i.e. CN was reduced from 10 mg/lt become 0.01 mg/lt   Keywords : cyanide, pesticide industry.  

PROSES PENGKELATAN MINYAK CENGKEH DENGAN ASAM SITRAT

Silviana, Silviana ( Jurusan Teknik Kimia, Fakultas Teknik Universitas Diponegoro Kampus Tembalang, Semarang 50239 Telp./Fax. (024)7460058/(024)76480675 )

METANA Volume 5 Nomor 2 Desember 2007
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Abstract

Abstract   Clove leaf oil is essential oil produced by distillation of clove leaf. The oil is still dark color and low eugenol content, generally. It was caused by Fe content in the oil, so the oil has dark color. Furthermore, it needs to improve the value of clove leaf oil through chelating process with citric acid. The objective of research is to obtain the significant variable for content and volum response. The research conducts with initial Fe content, chelating process, and final analysis of Fe content. Analysis of Fe content uses Spectrofotometry. The research uses design of experiment: factorial design 24 with variables: citric acid concentration (1- 2%b), temperature (50oC – 70oC), time (l - 2 hours) and stirring speed (300-600 rpm). Data treatment obtained using Design Expert software. The result shows that temperature and time are significant variable for decreasing Fe content. Decreasing of Fe content from initial content 22,98mg/L down to l,86 - 2l,26mg/L. Regresion model obtained is Eugenol =74,45 + 0,10325 temperature. However, absorbent concentration and stirring speed variables have significant influent for decreasing volume. The regresion model obtained is Fe content = 34,6075-(0,54775T)-29,0551+0,548Tt, where T  is temperature and t is time of chelating process.   Key word: clove leaf oi;  chelaling;  citric acid; Fe  content  

TEKNOLOGI PENGAWETAN BUAH TOMAT DENGAN METODE FREEZE DRYING

Pujihastuti, Isti ( Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH, Pedalangan Tembalang, Semarang 50239 )

METANA Volume 6 No. 01 April 2009
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Abstract

  Abstract The laboratory equipments are important in elaboration of technologies in freeze drying, for research of the product quality, amelioration, moreover determination of transport properties. Our department has a laboratory vacuum freeze drying equipment. We can register all the data during the procedure. Its important to analyze this freeze drying procedure, because this is elementary for system designing. we have constructed the necessary measuring instruments, their arrangement. The automatitation of this process isnt a simple problem. The principal measured characteristics are mass of dried product, temperature of dried product layer, temperature of the heater, vacuum, freezing temperature. We can measure the dried products weight by a load cell, with the necessary accuracy.   Kata kunci : freeze drying, tomato  

PENGANTAR REAKSI

Kusumayanti, Heny ( PSD III Teknik Kimia FT UNDIP )

METANA Volume 6 No. 01 April 2009
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Abstract

PENGANTAR REDAKSI

PENGGUNAAN MEMBRAN ULTRAFILTRASI DALAM PEMBUATAN SARI BUAH RAMBUTAN

JOS, BAKTI ( Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro Jl. Prof. Sudharto, Tembalang, Semarang, 50293 ) , Susanto, Heru ( Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro Jl. Prof. Sudharto, Tembalang, Semarang, 50293 ) , Kuntolaksono, Satrio ( Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro Jl. Prof. Sudharto, Tembalang, Semarang, 50293 ) , Ariyanto, Yanuar ( metana_teknikkimia@yahoo.com )

METANA Volume 06, Nomor 2, Tahun 2010
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Abstract

Abstract   Hairy fruit (Nephelium sp) is fruit of horticultural belong in family Sapindacaeae. Membrane is a thin layer separates two phases which allow the displacement of specific components and hold other components that do not being needed. Ultrafiltration is a filtration process using membranes that filter out particles with a size of 20 to 1000 Angstrom. Results of ultrafiltration has high purity (0.4 to 0.6 NTU turbidity) than results from conventional manner (1.5-3 NTU turbidity). Yield gained was 5-8% higher than that gained from conventional. Dependent variable used is kind of hairy fruits (crops and cans). The independent variable is the pressure 2 kg/cm2, 3 kg/cm2, 0.4 kg/cm2, 0.5 kg/cm2, 0.6 kg/cm2 and the type of membrane (PES and hydrosart). The result of the study showed that greater operation pressure resulted in greater turbidity, and greater flux. The greater flux resulted smaller selectivity and pass the requirement of Environmental Protection Agency, USA.   Key word : Hairy fruits, juice, membrane, ultrafiltration

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