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All Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
M. Yusuf, Darmadi
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Chemical Engineering, Chemistry & Bioengineering Energy Engineering

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The Treatment of Hospital Wasterwater Electrocoagulation Using Iron Electrodes: Analysis by Response Surface Methodology M. Yusuf, Darmadi; Lubis,, Mirna Rahmah; Adisalamun, Adisalamun
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.13790

Abstract

Hospital wastewater basically contains organic materials and inorganic materials. Levels of these materials can be determined by testing of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Dissolved Solid (TDS), and Total Suspended Solid (TSS). The hospital wastewater treatment proposed in this research is the electrocoagulation treatment using electrodes Fe-Fe and uses the response surface method for optimizing the response variable. Referring to this resea rch, the result shows that the relationship between the process variables and the TSS is significantly influential. As the contact time (15, 30, and 45 minutes) is longer and the voltage (6, 9, and 12 volts) is higher, the percentage reductions of TSS increase. However, the electrolyte solution (01 M) has little influence/significance to a response variable of TSS. The highest percentage of TSS reduction is at the contact time 30 minutes and 12 volts, which declined at contact time 45 minutes. The model recommended is a quadratic form with a low error less than 1.6%. In such a way, the optimum condition is at contact time 36 minutes, voltage 12 volts, and the electrolyte (NaCl) concentration 0.1 M. The reduction percentage is TSS 72.45%.
Studi Pengaruh Suhu Terhadap Properties Gas-Cair pada Proses Absorpsi CO2 Menggunakan a-MDEA Achir, Zulfakhri; M. Yusuf, Darmadi; Salamun, Adi
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 1 (2018): Jurnal Rekayasa Kimia & Lingkungan (June, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i1.9241

Abstract

Kecepatan transfer massa dan panas antara gas dan cairan sepanjang kolom absorpsi merupakan dasar dari proses perhitungan absorpsi CO2 dari gas sintesa menggunakan solven MDEA dengan aktivator Piperazine. Model transfer massa dan reaksi kimia yang terjadi disusun secara matematis dari neraca massa dan neraca panas gas cairsepanjang kolom berdasarkan teori dua lapisan film (two-film theory) dengan pendekatan overall rate transfer. Properties campuran gas dan cairan yang diperlukan dalam perhitungan, diestimasi dari properties individual gas cair dengan menggunakan konsep mixing rules. Estimasi properties campuran gas cair dilakukan dalam modul sub-function yang dibangun dengan code programming. Verifikasi modul sub-function dilakukan dengan membuat perbandingan antara properties gas cair dari literature dengan properties hasil estimasi yang merupakan output dari sub-function yang sudah disusun.Variabel yang berpengaruh langsung terhadap perubahan properties campuran gas cair adalah suhu.
Co-Authors Achir, Zulfakhri Adi Salamun, Adi Adisalamun Adisalamun Mirna Rahmah Lubis