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All Journal Seminar Nasional Teknik Kimia Kejuangan Jurnal Teknik Kimia Indonesia
Bakti Jos
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science

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Journal : Seminar Nasional Teknik Kimia Kejuangan

 1 
Optimasi Proses Ozonasi Untuk Penurunan Kadar Krom (Cr) dalam Limbah Cair Elektroplating dengan Metode Respon Permukaan Aji Prasetyaningrum; M. Djaeni; Bakti Jos; Yudhy Dharmawan
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Industrial wastewater from electroplating process containing the heavy metals, such as Chromium (Cr). The initial content of Cr in electroplating waste water was approximately 78.24 ppm. The Cr content may be discharged into waters and safe for the environment is 2 ppm.Industrial electroplating waste water usually treated with a combination of chemical and physical processes such as coagulation and flocculation. However, conventional processing system requires a long of processing time and a large area. This study aims to provide an alternative treatment of electroplating wastewater through the application of ozonation technology. Response Surface Methodology was used to obtain optimum conditions in decreased levels of Cr content. Variable for ozonation process included of ozonation time (X1), pH (X2) and ozone gas flow rate (X3). The results showed that the effectiveness of ozonation treatment increase at lower pH. The high value of correlation (R2 = 0.93767) indicated that a high correlation values between the experimental and prediction data. The optimum conditions for Cr degradation at 30 minutes of ozonation treatment, pH 2 and ozone gas flow rate of 3 L min-1, with the lowest contentration of Cr was 1.92 ppm.
Perbandingan Granular Starch Hydrolyzing Enzyme dengan Glukoamilase Pada Proses Sakarifikasi Konvensional Pati Casava untuk Memproduksi Etanol Hargono .; Andri Cahyo Kumoro; Bakti Jos
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

In a conventional cassava starch is converted into dextrins using liquefaction enzymes at high temperatures(90–120°C) during a liquefaction step. Dextrins are hydrolyzed into sugars using saccharification enzymesduring a simultaneous saccharification and fermentation (SSF) step. Recently, a granular starch hydrolyzingenzyme (GSHE), Stargen 002, was developed that converts starch into dextrins at low temperatures (30°C) andhydrolyzes dextrins into sugars during SSF. In this study, cassava starch using GSHE enzyme was comparedwith glucoamylase of commercial saccharification enzyme. Cassava starch processes for GSHE andglucoamylase treatments were performed at the same process conditions except for the saccharification step(60°C). For GSHE and glucoamylase treatments, ethanol concentrations at 72 hr of fermentation were 12.3,12.8% (v/v), respectively. Sugar profiles for the GSHE treatment were different from glucoamylase treatments,especially for reducing sugar. During SSF, the highest reducing sugar concentration for GSHE treatment was8% (w/v), whereas for glucoamylase treatments, reducing sugar concentrations had maximum of 15% (w/v).
Co-Authors Aji Prasetyaningrum Andri Cahyo Kumoro Dessy Ariyarti Hargono . Herry Santosa M. Djaeni Siswo Sumardiono Yudhy Dharmawan