Rusdianasari Rusdianasari
Chemical Engineering Department, State Polytechnic of Sriwijaya, Palembang 30139, Indonesia

Published : 4 Documents
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Treatment of Traditional Cloth Wastewater by Electrocoagulation Using Aluminum Electrodes Rusdianasari, Rusdianasari; Bow, Yohandri; Yuniar, Yuniar
International Journal on Advanced Science, Engineering and Information Technology Vol 4, No 2 (2014)
Publisher : International Journal on Advanced Science, Engineering and Information Technology

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Abstract

The existence of the textile industry in Indonesia is not only included in the category of large and medium scale industries, but also in small-scale and some even in the household (home industry). This led to the pollution caused by the textile industry, especially as a result of the presence of the textile dyeing not only occur in industrial areas but also occurs in densely populated settlements. To overcome the problem of environmental pollution that occurs, it needs treatment of the textile wastewater. Treatment of traditional cloth wastewater by electrocoagulation using aluminum electrode material has been investigated in this paper. The effect of relevant wastewater characteristics such as pH and conductivity, and important process variables such as applied voltage and operating time on the chemical oxygen demand (COD), biological oxygen demand (BOD), turbidity, total suspended solid (TSS) and total dissolved solid (TDS).  The processing time is used 60, 75, 90, 105, 120 minutes and for the variation of the applied voltage is 6 V, 12 V, 18 V, and 24 V. The best conditions and the effectiveness of electrocoagulation for each parameter varies with the voltage is in the range between 6 V– 18 V with the processing time between 90-120 minutes. The effectiveness of electrocoagulation method to decrease the turbidity value 99.634%; TSS 49.679%; TDS 17.243%; BOD 91.778%; COD 97.260% and to decrease the conductivity value of 23.631% and the increase in pH from 6.34 to 7.79.
Application of Electrocoagulation Process for Continuous Coal Stockpile Wastewater Treatment System Rusdianasari, Rusdianasari
Indonesian Journal of Fundamental and Applied Chemistry Vol 2, No 1 (2017): February 2017
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

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Abstract

Coal wastewater is characterized by high total suspended solid (TSS), heavy metals, and low acidity (pH). The purpose of this study was to research the effects of the operating parameters such as applied voltage, the number of electrodes, and reaction time on a real coal stockpile wastewater in the continuous electrocoagulation process. For this purpose, aluminum electrodes were used in the presence of potassium chloride as an electrolyte. It has been shown that the removal efficiency of TSS and heavy metals content increased with increasing the applied voltage and reaction time. The results indicate that the electrocoagulation process is efficient and able to achieve 88.67% TSS removal, 95.65% ferrous removal, 99.11% manganesse removal, and pH increased until 7.1 at 24 volts during 120 min, respectively. The experiments demonstrated the effectiveness of electrocoagulation methods for the treatment of coal stockpile wastewater.Key words: coal stockpile wastewater, electrocoagulation, electrode
Biodiesel Production from Waste Cooking Oil using Electrostatic Method Susumu, Susumu; Rusdianasari, Rusdianasari; Yusi, Syahirman
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 3, No 3 (2018): October 2018
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Biodiesel (methyl ester) produced from trans esterification of waste cooking oil is a potential material to replace diesel fuel. The biodiesel can be obtained by using electrostatic method equipped with fixed distance electrode 1.5 cm and voltage at 12 volts. Coagulation of particle process i.e. glycerin drops in biodieselglycerinmixture was based on electrical field. Reactants used were methanol over KOH catalyst and temperature was set at 60 C. The residence time was varied as well as methanol to waste cooking oil ratio. Analysis result shows the process was able to obtain yield up to 83.3%. The quality of biodiesel produced was tested and satisfy the requirement according to National Standard of Indonesia (SNI), i.e. density 0.8594 mg/mL (compared to SNI: 0.85-0.90 mg/mL), flash point 191 C (SNI min 100 C), water content 0.0342% (SNI max 0.05%) and viscosity at lower limit 2.31 cSt. According to SNI 7182-2015 the above value meets the specified standard.
PENGARUH SUHU DAN WAKTU SANGRAI TERHADAP HASIL BUBUK BRAMSEKO PADA ALAT PENYANGRAI BIJI-BIJIAN FLUIDISASI Safitri, Andi Fitra; Rusdianasari, Rusdianasari; Amin, Jaksen M
Jurnal Teknik Kimia Vol 25, No 2 (2019): Jurnal Teknik Kimia
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, Universitas Sriwijaya

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Abstract

Minuman kopi termasuk salah satu jenis minuman yang paling digemari oleh hampir seluruh masyarakat dunia. Minuman serupa kopi ternyata dapat dibuat dari biji rambutan. Biji rambutan yang digunakan sebagai obat diabetes diolah dengan cara disangrai dan dihaluskan kemudian diseduh agar bisa dikonsumsi. Pengolahan tersebut sama dengan cara pengolahan biji kopi menjadi bubuk kopi. Proses penyangraian biji rambutan dilakukan dengan alat penyangrai biji-bijian tipe fluidisasi. Alat penyangrai tipe fluidisasi yang dirancang terdiri dari tangki sangrai yang berbentuk limas segiempat, 2 buah heater, 1 buah blower dan control panel. Biji rambutan dimasukkan ke dalam tangki sangrai kemudian dikontakkan dengan udara panas yang dihembusakan oleh blower. Kecepatan fluidisasi minimum untuk 200 gram biji rambutan adalah 5 m/s. Penyangraian biji rambutan secara optimum terjadi pada suhu sangrai 180oCdengan waktu sangrai 10 menit. Bubuk biji rambutan serupa kopi (bramseko) dianalisa nilai kadar air dan kadar abu yang hasilnya adalah 0,20% dan 2,34%, hasil ini memenuhi standar mutu bubuk kopi SNI 01-3542-2004. Untuk mengetahui nutrisi bubuk “bramseko”, dilakukan analisa protein dan kadar proteinnya adalah 2,79%. Dari hasil analisa ekonomi yang dilakukan, pengolahan “bramseko” akan mencapai BEP jika telah menyangrai biji rambutan sebanyak 17 kg/bulan dengan keuntungan sebesar Rp.4.969.688/bulan dan waktu pengembalian modal adalah 2 bulan.