3.Seminar Nasional Teknik Kimia Tahun 2008

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Browsing 3.Seminar Nasional Teknik Kimia Tahun 2008 by Author "Chairul"

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    Kinetika Reaksi Pengolahan Limbah Cair dengan Sistem Lumpur Aktif Menggunakan EM 4 sebagai Kultur Mikroorganisme
    (2016-02-25) Purwaningsih, Is Sulistyati; Chairul; Amraini, Said Zul
    Penelitian pengelolaan COD air limbah kota dengan menggunakan Sistem Lumpur Aktif (activated sludge) dijalankan dalam suatu rangkaian reaktor lumpur aktif aliran sinambung dengan EM 4 (Effective Microorganism 4) sebagai sumber mikroba. Reaktor dilengkapi dengan aerator yang berfungsi sebagai sumber oksigen untuk mikroba sekaligus sebagai pengaduk. Sebagai umpan digunakan limbah cair sintesis dengan COD 1020 mg/l yang dimasukkan ke dalam Reaktor Alir Tangki Berpengaduk (RATB) dengan SRT (Solid Retention Time) pada kisaran antara 5 – 20 hari. Hasil penelitian menunjukkan bahwa reaktor lumpur aktif mampu menyisihkan COD antara 79-88 %. Pada kondisi SRT 5,10,15 dan 20 hari tersebut di atas, diperoleh nilai MLSS berturut-turut 544, 613, 651 dan 677 mg/l. Dari penelitian juga diperoleh kinetika pengolahan secara biologi berupa koefisien perolehan sel (Y) sebesar 0,5994 mg sel/mg COD substrat, laju kematian spesifik (kd) sebesar 0,7078 /hari, laju pemanfaatan substrat maksimum (k) sebesar 3,288/hari, dan konstanta setengah jenuh (Ks) = 135,583 mg/l. Ditinjau dari kadar COD, keluaran dari hasil pengolahan belum memenuhi baku mutu standar kualitas air.
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    Produksi Enzim Protease Alkalin Dari Bacillus substilis Dengan Media Limbah Cair Tahu
    (2016-02-25) Evelyn; Chairul; Lestari, Diana; Purnama, Fauziah R
    Proteases are one of the most important industrial enzymes accounting for nearly 60% of the total worldwide enzyme sales. Of these, alkaline proteases are employed primarily as cleansing additives to detergents and in bating of hides and skins in leather industries. Among the various proteases, bacterial proteases are the most significant, compared with animal and fungal proteases, especially from Bacillus species. This research try to produce enzyme of protease alkaline by using submerged fermentation technology and exploit local soybean cake liquid waste medium to determining optimum medium composition, temperature and pH in producing the enzyme constructively Bacillus substilis. In order to get the optimum concentration fermentation media and pH, research was conducted of flour concentration at 10%, 20%, 30%, and pH at 7, 8, 9, 10 and 11 respectively. The optimum fermentation temperature of alkaline protease was obtained with temperature variation at 30, 40, 50, 60 and 70 oC. Fermentation process took place during 72 hour to the each variable and conducted by intake of sample every 12 hours. Enzyme activities were determined by using Protease Colorimetric Detection Kits from Sigma, which were calculated by rate of tyrosine existing in mixture of reagent and samples were analyzed using spectrophotometer. Result showed that the optimum conditions obtained were at fermentation medium (grist flour) concentration of 10%, early pH media of 9 and temperature of incubation of 30 oC with maximum enzyme activity 32,90 unit/ml.