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All Journal Reaktor International Journal of Science and Engineering (IJSE) TEKNIK METANA Jurnal Ilmu Lingkungan Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Teknik Kimia USU JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Jurnal Riset Industri agriTECH Jurnal Kelautan Tropis Communications in Science and Technology Jurnal Abdi Masyarakat Indonesia Jurnal Teknik Kimia USU
I Nyoman Widiasa
Chemical Engineering Dept., Faculty Of Engineering, Universitas Diponegoro Jl. Prof. Soedarto SH Tembalang Semarang Telp./Fax. (024)7460058 / (024)76480675
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health Other

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Study on Treatment of Slaughterhouse Wastewater by Electro-coagulation Technique B. Budiyono; I Nyoman Widiasa; Seno Johari
International Journal of Science and Engineering Vol 1, No 1 (2010)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (227.985 KB) | DOI: 10.12777/ijse.1.1.25-28

Abstract

Electro-coagulation (EC) is well known as a technique for removing suspended solids as well as oils and greases from wastewater. The aims of this research are to study the performance of the EC technique to treat a high strength wastewater from slaughterhouse in batchwise mode. The effect of various process variables such as number and electrode material, initial pH, suspended solid (SS) content, and operating time was investigated The electrolytic cell (electro-coagulator) used was a 600 ml cylinder glass reactor with working volume 400 ml and equipped by magnetic stirrer without temperature control. Cast iron (Fe) and aluminum (Al) cylinder were used as anode/cathode pair. The number of electrode was varied 1 and 2 pairs. The effective area of the electrode pair was 6.28 cm2. The DC power supply was controlled by a voltmeter and be adjusted constant at 125 A/m2 for each test runs. The initial SS concentration were varied from 1250, 2100, 3000, and 4000 mg/L by diluting wastewater. It is found that effluent temperature depends on SS and increases up to 98 °C when SS content was 4000 mg/L. One and two pairs of Fe-Al electrode will give SS removal efficiency are 97.2 and 99.6 %, respectively. However, the higher electrode number will need the shorter time to get certain removal efficiency of SS.  Number of electrodes didn’t give the significant impact to the final pHs. With initial pH 7.05 both two pair of electrode will give the final pH relatively constant to 7.80. Further work will be conducted to optimize the CD and charge loading to avoid the excessive temperature increase
CO2 Removal from Biogas Using Carbon Nanotubes Mixed Matrix Membranes Tutuk Djoko Kusworo; Ahmad Fauzi Ismail; , Budiyono; I Nyoman Widiasa; Seno Johari; , Sunarso
International Journal of Science and Engineering Vol 1, No 1 (2010)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4049.762 KB) | DOI: 10.12777/ijse.1.1.1-6

Abstract

A new type of mixed matrix membrane consisting of polyethersulfone (PES) and carbon nanotubes (CNTs) is prepared for biogas purification application. PES mixed matrix membrane with and without modification of carbon nanotubes were prepared by a dry/wet phase inversion technique using a pneumatically membrane casting machine system. The modified carbon nanotubes were prepared by treating the carbon nanotubes with chemical modification using acid treatment to allow PES chains to be grafted on carbon nanotubes surface. The results from the FESEM, DSC and FTIR analysis confirmed that chemical modification on carbon nanotubes surface had taken place. Meanwhile, the nanogaps in the interface of polymer and carbon nanotubes were appeared in the PES mixed matrix membrane with unmodified of carbon nanotubes. The modified carbon nanotubes mixed matrix membrane increases the mechanical properties and the permeability of all gases. For PES-modified carbon nanotubes mixed matrix membrane the maximum selectivity achieved for CO2/CH4 is 23.54
Increasing Biogas Production Rate from Cattle Manure Using Rumen Fluid as Inoculums Budiyono Budiyono; I Nyoman Widiasa; Seno Johari; S Sunarso
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (813.921 KB) | DOI: 10.12777/ijse.6.1.31-38

Abstract

In this study, rumen fluid of animal ruminant was used as inoculums to increase biogas production rate from cattle manure at mesophilic condition. A series of laboratory experiments using 400 ml biodigester were performed in batch operation mode. Given 100 grams of fresh cattle manure (M) was fed to each biodigester and mixed with rumen fluid (R) and tap water (W) in several ratio resulting six different M:W:R ratio contents i.e. 1:1:0; 1:0.75:0.25; 1:0.5:0.5; 1:0.25:0.75; and 1:0:1 (correspond to 0; 12.5; 25, 37.5; 50, and 100 % rumen, respectively) and six different total solid (TS) contents i.e. 2.6, 4.6, 6.2, 7.4, 9.2, 12.3, and 18.4 %. The operating temperatures were at room temperature. The results showed that the rumen fluid inoculated to biodigester significantly effected the biogas production. Rumen fluid inoculums caused biogas production rate and efficiency increase more than two times in compare to manure substrate without rumen fluid inoculums. The best performance for biogas production was the digester with rumen fluid and TS content in the range of 25-50 % and 7.4 and 9.2 %, respectively. These results suggest that, based on TS content effects to biogas yield, rumen fluid inoculums exhibit the similar effect with other inoculums. Increasing rumen content will also increase biogas production. Due to the optimum total solid (TS) content for biogas production between 7-9 % (or correspond to more and less manure and total liquid 1:1), the rumen fluid content of 50 % will give the best performance for biogas production. The future work will be carried out to study the dynamics of biogas production if both the rumen fluid inoculums and manure are fed in the continuous system Doi: 10.12777/ijse.6.1.31-38 [How to cite this article: Budiyono, Widiasa, I.N., Johari, S. and Sunarso. (2014). Increasing Biogas Production Rate from Cattle Manure Using Rumen Fluid as Inoculums. International Journal of Science and Engineering, 6(1),31-38. Doi: 10.12777/ijse.6.1.31-38] 
The Effect of Feed to Inoculums Ratio on Biogas Production Rate from Cattle Manure Using Rumen Fluid as Inoculums S. Sunarso; Seno Johari; I Nyoman Widiasa; B. Budiyono
International Journal of Science and Engineering Vol 1, No 2 (2010)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.799 KB) | DOI: 10.12777/ijse.1.2.41-45

Abstract

In this study, rumen fluid of animal ruminant was used as inoculums to increase biogas production rate from cattle manure at mesophilic condition. A series of laboratory experiments using 400 ml biodigester were performed in batch operation mode. Given 100 grams of fresh cattle manure was fed to each biodigester and mixed with rumen fluid and tap water resulting five different feed to inoculum (F/I) ratios (i.e. 17.64, 23.51, 35.27, and 70.54). The operating temperatures were varied at room temperature. The results showed that the rumen fluid inoculated to biodigester significantly effected the biogas production. Rumen fluid inoculums caused biogas production rate and efficiency increase more than two times in compare to manure substrate without rumen fluid inoculums. At four F/Is tested, after 80 days digestion, the biogas yield were 191, 162, 144 and 112 mL/g VS, respectively. About 80% of the biogas production was obtained during the first 40 days of digestion. The best performance of biogas production will be obtained if F/I ratio is in the range of 17.64 to 35.27 (correspond to 25 – 50 % of rumen fluid). The future work will be carried out to study the dynamics of biogas production if both the rumen fluid inoculums and manure are fed in the continuous system
Mortalitas Larva Litopenaeus vannamei Pada Penerapan Perbedaan Sistem Filtrasi Air Media Pemeliharaan Sunaryo Sunaryo; I Nyoman Widiasa; Ali Djunaedi; Priyo Sasmoko
Jurnal Kelautan Tropis Vol 21, No 2 (2018): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.771 KB) | DOI: 10.14710/jkt.v21i2.3089

Abstract

Mortality of Litopenaeus vannamei larvae with the different filtration system of seawater as media for rearingMortality of Litopenaeus vannamei larvae in shrimp hatcheries centers is commonly high. Therefore, innovation to solve the problem through water quality management improvement in necessary by applying ultrafiltration system to shrimp hatchery. This experiment aims to determine larval mortality rate in response to the application of different filtration systems. Experiments were conducted using 4 milions larvae of L. vannamei shrimp. Shrimp larvae were kept in 4 tanks, each volume was 8 m3. Two reservoirs tank were equipped with ultrafiltration and other systems used sand-filter as controls. Implementation of experimental activities used action research method with two repetitions. Observation were conducted on mortality of shrimp larvae and water quality, i.e., temperature, salinity, pH, TSS, dissolved O2, NH3 and NO3-2. The result showed the shrimp larvae reared with the application of ultrafiltration system had significantly lower percentage of mortality (55,02 %) compared with filtering using sand-filter (59,58 %). Concentrations of Ammonia (NH3-N) and TSS content increased along with longer period of larval rearing.Mortalitas  larva udang Litopenaeus vannamei di sentra pembenihan masih tinggi. Inovasi sistem pengendalian kualitas air pada media pembenihan udang perlu dilakukan. Percobaan dilakukan untuk mengetahui respon tingkat mortalitas larva Litopenaeus vannamei denan penerapan perbedaan sistim filtrasi. Pelaksanaan percobaan menggunakan metode action research dengan pengulangan 2 kali. Percobaan dilakukan dengan menggunakan larva Udang Litopenaeus vannamei stadia larva sebanyak 4 juta ekor. Larva Udang dipelihara dalam 4 buah bak. Dua buah bak  dilengkapi dengan sistem ultrafiltrasi dan bak lainnya menggunakan sandfilter sebagai kontrol. Pengamatan dilakukan terhadap mortalitas larva udang, suhu, salinitas, pH, MPT, O2 terlarut, NH3 dan NO3-2. Hasil penelitian menunjukkan bahwa rata-rata mortalitas Larva udang Vannamei yang dipelihara dengan pola pemeliharaan dengan penerapan sistim ultrafiltrasi adalah 55.02% yang berbeda sangat nyata (p>0,01) dibandingkan dengan penerapan pola pemeliharaan menggunakan sandfilter yaitu 59,58% . Kualitas air media pemeliharaan larva udang Vannamei, terutama: kandungan Ammoniak (NH3-N) dan MPT menunjukkan semakin meningkat dengan semakin lamanya waktu pemeliharaan.
PENGOLAHAN AIR LUMUT DENGAN KOMBINASI PROSES KOAGULASI DAN ULTRAFILTRASI A Arinaldi; F Ferdian; I Nyoman Widiasa
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (213.991 KB)

Abstract

Air berlumut adalah air yang mengandung lumut yang terlarut di dalamnya. Lumut yang terlarut dalam air dapat menyebabkan gangguan. Pada penelitian ini, digunakan proses koagulasi dan flokulasi, yang kemudian dilanjutkan dengan proses ultrafiltrasi untuk memisahkan lumut dari air berlumut. Pralakuan koagulasi-flokulasi pada umpan membran dilakukan untuk memperpanjang umur membran dan meningkatkan kinerja pemisahan membran ultrafiltrasi dalam pengolahan air berlumut ini. Koagulan yang digunakan adalah tawas dan PAC, variabel pH antara 5 – 8, dan konsentrasi koagulan antara 50 – 250 ppm. Umpan berupa air berlumut memiliki kekeruhan 75 – 100 NTU. Didapatkan hasil bahwa pH optimum untuk proses koagulasi dengan kedua jenis koagulan adalah pada pH netral (6,5 – 7,5). Konsentrasi koagulan tawas optimum adalah 100 – 200 ppm, sedangkan konsentrasi PAC optimum adalan 50 – 100 ppm. Dari penelitian ini juga dapat disimpulkan bahwa pralakuan koagulasi sebelum proses ultrafiltrasi pada pengolahan air berlumut akan mengurangi beban kerja membran ultrafiltrasi.
PENYISIHAN AMONIAK DAN KEKERUHAN PADA SISTEM RESIRKULASI BUDIDAYA KEPITING DENGAN TEKNOLOGI MEMBRAN BIOFILTER Malida Fauzzia; Izza Rahmawati; I Nyoman Widiasa
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.616 KB)

Abstract

Crabs are one of the economically valuable commodities. Barriers that often occur in crab farming in ponds is limited land and water. Crab aquaculture activities can not be apart from the waste generated, which can cause water quality degradation, especially of food remains, feases and the metabolism of the crabs. Waste produced as ammonia is toxic at high concentrations and high turbidity can cause death in the crabs. Alternative technologies are used to decrease the production of crabs due to lack of availability of  land and water degradation are water recirculation system using a membrane biofilter. Membrane biofilter is used to maintain the water quality is to eliminate ammonia to levels not exceeding 0.1 ppm, and removing turbidity to <30 NTU.  Biofilter  is used to eliminate ammonia by nitrification and denitrification process using aerobic and anaerobic mikrroorganisme. Membranes which is used to reduce turbidity is ultrafiltration membranes. Flux on the membrane will determine the performance of the membrane. If  the flux decreased 85% from the initial flux, indicating the occurrence of fouling on membrane. This fouling can be overcome by washing. One of  it is the backwash. Using biofilter can reduce of ammonia from 4,41 mg/L up to 1,48 mg/L during 7 days. Turbidity can be reduced by using ultrafiltration membrane. In the Ultrafiltration membrane fouling control can be done by backwash 30 minutes 15 seconds. This is indicated by the high flux of the membrane.
PEMISAHAN FAT, OIL, AND GREASE (FOG) DARI LIMBAH FOODCOURT DENGAN DISSOLVED AIR FLOTATION Bayu Satria Utama; Maria E. Simorangkir; I Nyoman Widiasa
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 1, Nomor 1, Tahun 2012
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Abstract

Oil waste water is the source of pollution that is often found in everyday life. Oil as a pollutant that is contained in the water must be separated so that oil can be utilized, and its existence as a pollutant can be removed. In this research study will be conducted to find the most suitable parameters of the pressure to separate the fat, oil, and grease from waste water foodcourt with Dissolved flotation. The variables used in the separation pressure is 4.5; 5; 5.5; and 6 bar. Separation results obtained will be analyzed by using analysis of total suspended solids. Data analysis results obtained are total suspended solids in the feed of 40,000 mg / L, after the water is separated using flotation Dissolved respectively obtained at a pressure of 4.5 bar total suspended solids of 3000 mg / L, at a pressure of 5 bar can get the total solids suspension of 2500 mg / L, at a pressure of 5.5 bar total suspended solids obtained at 1500 mg / L, and at a pressure of 6 bar obtained total suspended solids of 500 mg / L.
KARAKTERISTIK PENURUNAN FLUKS PADA FILTRASI LARUTAN HUMIC ACID DENGAN MEMBRAN MIKROFILTRASI A Ardiansyah; Ario Budi Kusumo; I Nyoman Widiasa
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 2, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Abstract

Natural surface water is containing various organic matter. One of them is Humic Acid (HA) which is known as the major cause of fouling in membrane filtration, and proved carcinogenic to human body. This study is carried to characterize flux reduction of HA filtration with Microfiltration Membrane. The analysis in the research is carried out by flux and absorbancy measuring. From this study the following conclusion can be taken; highest flux reduction are detected in the first 5 minutes of operations then slows down in the 15th minutes and later, where higher the HA solution concentration, will result in higher flux reduction. With the HA 5 ppm and HA 25 ppm’s J/Jw in 0,49 and 0,25, respectively in the 120th minutes. The addition of ion CaSO4 slows the rate of flux reduction, where it shows J/Jw of 0,051in the 120th minute. For filtration in different pressure, higher the pressure will result ini higher rate of flux reduction too., While in filtration of HA solution in different pH, highter the pH will result in the lowering the rate of reduction of flux. In the addition of ozone injection, the experiment carried shows that ozone addition is not giving any significant change on flux reduction.
PENYISIHAN KEKERUHAN PADA SISTEM PENGOLAHAN AIR SUNGAI TEMBALANG DENGAN TEKNOLOGI RAPID SAND FILTER Catur Pamularsih; Dera Choanji; I Nyoman Widiasa
JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Volume 2, Nomor 4, Tahun 2013
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Diponegoro,

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Abstract

Design of rapid sand filters differ from one place to another because it has the distinction of influent. Therefore in order to obtain the optimal, effective and efficient design for water treatment tembalang river so that the effluent can be used around the community. The purpose of this study is to get a pattern of rapid sand filter operation with water from  Tembalang river. Variables used in this study is the loading rate (10, 11, 12 gpm/ft2), high media filter (60 and 100 cm), and the addition of coagulant. The result of study showed 85% reduction of turbidity by using a loading rate of 10.2 gpm/ft2 at height of 100 cm filter media. At loading rate 11.75 gpm/ft2 removal turbidity by using a coagulant will be more effective when compared to not using coagulants.
Co-Authors A A Susanto A Ardiansyah A Arinaldi Adina, Alifia Rizki Adyaksa, M. Nur Ahmad Fauzi Ismail Ahmad Fauzi Ismail Ali Djunaedi Ario Budi Kusumo Asteria Apriliani Susanto Ayu Putri Lestari B Budiyono Bambang Pramudono Bayu Satria Utama Berkah Fajar Bernadeta Eka Naftalina Catur Pamularsih Dera Choanji F Ferdian Febrianto Adi Nugroho Gatra Buana Winiarti Ghina Shofi Pratiwi Hasristuti, Nani Hendrik Wijaya Heny Herawati Heny Herawati Heru Susanto I Gede Wenten Izza Rahmawati Jannah, Rizkiyah Fatikhatul Jayanti, Retno Dwi JS, Ikha Rasti Kendri yanto Kendriyanto Kendriyanto Khoiriyah, Lu'luatul Lestari, Amelia Eka Linda Aliffia Yoshi, Linda Aliffia Luqman Buchori Malida Fauzzia Maria E. Simorangkir Michael MGP Simatupang Miranti Budi Kusumawati Nafiunisa, Aininu Nita Aryanti Noer Abyor Handayani Nur Rokhati Priyo Sasmoko Putri, Tanti Nabella Putu Teta Prihartini Aryanti Rahmanisa, Riang Anggraini RATNAWATI Ratnawati Ratnawati Retno Dwi Jayanti Retno Dwi Jayanti Riang Anggraini Rahmanisa Savero Pakavi Zahrudin Seno Johari Seno Johari Seno Johari Seno Johari Seno Johari Siswo Sumardiono Sunarso . Sunaryo Sunaryo Sunaryo Sunaryo Titik Istirokhatun Tito, Adryan Tutuk Djoko Kusworo Wishnu Wijaya Yasmin Nabilah Zakki, Abdurrahman