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All Journal Jurnal Rekayasa Proses Reaktor Journal of Engineering and Technological Sciences Jurnal Rekayasa Proses Jurnal Teknik Kimia Indonesia Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Rekayasa Proses

Lieke Riadi

Jurusan Teknik Kimia Fakultas Teknik Universitas Surabaya

Author-ID : 2533199

Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Energy Engineering Materials Science & Nanotechnology Social Sciences

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Response Surface Approach for Optimization of Protein Hydrolysis from Reutealis trisperma Cake as Potential Animal Feedstock Yuana Elly Agustin; Lieke - Riadi; Titie Prapti Utami
Reaktor Volume 20 No.1 March 2020
Publisher : Dept. of Chemical Engineering, Diponegoro University

The conditions for protein hydrolysis were optimized to prepare Reutealis trisperma cake for potential animal feedstock. The cake’s content was 34.03 % protein, 6.32 % moisture, 18.56 % total sugar, 15.58 % lipid and 25.51% others. Other components in cake could be fibre and lignin. The cake is a byproduct of mechanical pressing process of the seeds and contains high protein content (34.03%). It was ground prior the hydrolysis process. A central composite design including concentration of NaOH, ratio of cake to NaOH, time and temperature were used to develop second order model to predict protein content under various experimental conditions. Protein yield was primarily affected by ratio pressed cake to NaOH and concentration of NaOH. Based on the Response Surface Methodology (RSM) model, maximum yield of protein was 11.33% which was obtained at cake/solvent ratio 1: 50; 1.5 % w/v NaOH; 15 minutes of hydrolysis at 40oC. The actual maximum protein yield from the experiment was obtained at cake/solvent ratio 1: 40; 1.5 % w/v NaOH; 20 minutes of hydrolysis at 45oC which was 21.28 %.Keywords: animal feedstock; protein hydrolysis; response surface; Reutealis trisperma

A COMPARATIVE STUDY OF YARN DYED WASTEWATER USING FENTON’S REAGENT AND OZONATION : REMOVAL EFFICIENCY AND ECONOMIC ANALYSIS Lieke Riadi; Richard Wisanto; Arief Rachmat Herlambang; Sasmita Mirifica Vania; Andy Widyasayogo
Reaktor Volume 16 No.4 Desember 2016
Publisher : Dept. of Chemical Engineering, Diponegoro University

This study makes a comparison between Fenton and Ozonation processes treatment methods to examine the removal of COD in yarn dyed wastewater with initial concentration of 525 ppm. Results indicated that the COD degradation efficiency was in order of Fenton > Ozone. In Fenton method, the ratio of Fe2+/H2O2 used was 1 :10, the concentration of H2O2 was 10.2 gram/L. In ozonation, the ozone concentration used in the study was 5.8 % mol, and the agitation was 400 rpm. The effect of operational parameters including, initial pH and time were studied in both processes. The results indicated that it was 86.2 % COD were removed, when the pH was about 3 using Fenton’s reagent and 83.06 % COD removal in ozonation for one hour experiment. To achieve the standard requirement for allowable parameters in wastewater to be discharged, there is only 15 minutes needed for Fenton process to remove COD by 84.8 %, while the ozonation needs 30 minutes for 81 %removal. Fenton process is more economic feasible compare to ozonation which is almost one-tenth of the operation cost for 1 liter of wastewater being process. Though both processes can demonstrate the high removal efficiency to achieve the allowable COD concentration in the wastewater to be discharged, Fenton process is favor to ozonation.

PENGOLAHAN PRIMER LIMBAH TEKSTIL DENGAN ELEKTROKOAGULASI Lieke Riadi; Whenny Ferydhiwati; Liok Dimas Sanjaya Loeman
Reaktor Volume 15, No.2, OKTOBER 2014
Publisher : Dept. of Chemical Engineering, Diponegoro University

Limbah industri tekstil di area pinggir kota Surabaya mempunyai karakteristik perbandingan COD dan BOD = 5.57. Limbah jenis ini sulit untuk dibiodegradasi. Studi ini mempelajari tekonologi elektrokoagulasi untuk mengolah limbah tekstil dengan menurunkan intensitas warna, Total Suspended Solid (TSS) dan Chemical Oxygen Demand (COD). Percobaan batch pada suhu kamar dilakukan untuk mempelajari pengaruh pH, jarak elektroda terhadap penurunan warna,TSS dan COD dan membandingkan biaya operasinya jika menggunakan pengolahan kimia.Effisiensi penurunan tertinggi untuk warna (91.96%), TSS (49.17%), dan COD (29.67%) terjadi pada pH awal 4.0 dan jarak elektroda 2 cm dengan elektroda Al/Al. Waktu optimum penurunan intensitas warna dalah 10 menit. Laju penurunan COD adalah : -dC/dt = 0.0053 C +0.056 , dengan C adalah konsentrasi COD. Jumlah sludge yang dihasilkan daripengolahan elektrokoagulasi 3.4 % lebih kecil dibandingkan menggunakan bahan kimia. Biaya yang digunakan untuk pengolahan dengan elektrokoagulasi 52.35 % lebih murah dibandingkan jika menggunakan koagulasi dengan bahan kimia ( tawas). Kata kunci : elektrokoagulasi, penurunan warna, penurunan TSS, laju degradasi COD, imbah tekstil Abstract Waste water from textile industry which is located in one suburb of Surabaya city as characteristic which the ratio of COD to BOD was 5.57. This type of waste water is difficult to be biodegraded. This study investigated elektrokoagulasi technology to treat textile waste water by removing color, total suspended solid, and Chemical Oxygen Demand. Batch experiment at room temperature was carried out to study the effect of pH, electrode distance for color, TSS and COD removal. This study also tried to compare the operation cost between elektrokoagulasi and chemical processes. The best removal efficiencies by Al electrodes was 91.96 % for color, 49.17 % for TSS and 29.67 % for COD which were under initial pH 4.0 and electrodes distance 2 cm. The optimum operation time for color removal was found 10 minutes.The COD degradation rate was - dC/dt = 0.0053 C +0.056, with C= COD concentration. Sludge result from elektrokoagulasi was 3.4 % less than that by chemical treatment.The operation cost for elektrokoagulasi is 52.35 % less than that for chemical coagulation.

Co-Authors Agustin, Yuana Elly Andy Widyasayogo Angelio, Ricardo Arief Rachmat Herlambang Candra Wijaya, Candra Farida Suhud Indrayani, Clarissa Jodie, Kennita Alvina Lanny Sapei Lie Hwa Liok Dimas Sanjaya Loeman Muharja, Maktum Octovania Sugianto Ong, Lu Ki Richard Wisanto Sangadji, Ningsi Lick Sasmita Mirifica Vania Sjarief Widjaja Sutikno, Kevin Hosea Titie Prapti Utami Tri Widjaja Tuani L. Simangunsong Whenny Ferydhiwati Yosephine Kristiani Yunus Fransiscus

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