Browsing by Author "Daud Syarfi"

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    Kombinasi Pengolahan Anaerob dan Membran Ultrafiltrasi Berbahan Polipropilen Untuk Proses Pengolahan Limbah Cair Kelapa Sawit
    (2013-03-21) Talis, Salmiati; Daud Syarfi; Ahmad Adrianto
    Palm oil wastewater of PTPN V potentially contaminating environment if we can’t handle correctly. The result of analysis showed that acidic pH’s value 4.0, the value of COD is 30,000 mg/L and TSS value is 8635 mg/L. This value is not in accordance with the decree of minister Environment number 51 of 1995 for pH values were in the range 6-9, for a COD value is 500 mg/L and TSS value is 300 mg/L. Research was done to reduce the value of that parameters to fit the provisions of the Government of Indonesia. Process carried out is anaerobic process. Problems that arise in this process is the washout of biomass so that was developed by combining anaerobic digestion process with membrane ultrafiltration. Anaerobic process carried out several stages, the seeding stage, acclimatization, startup and operational. pH values obtained in the final stage anaerobic process that is equal to 8.7, COD is 5000 mg/L with an efficiency of COD is 66.67% and TSS is 1510 mg/L. The results of the anaerobic process is passed through a membrane with pressure variation is 1.6 bar , 1.8 bar, and 2.0 bar. The best pressure is 1.8 bar with a pH value is 8.5, the value of COD is 2000 mg/L with an efficiency COD is 60% and TSS is 20 mg/L with an efficiency of TSS is 98.67%
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    OPTIMALISASI KONDISI PROSES PENCAMPURAN UNTUK MENINGKATKAN MORFOLOGI DAN SIFAT THERMOPLASTIC VULCANIZATE BERBASIS KARET ALAM DENGAN COMPATIBILIZER MALEATED NATURAL RUBBER
    (Teknobiologi Jurnal Ilmiah Sains Terapan, 2012-08) Martani, Russita; Bahruddin; Daud Syarfi
    Morphology and properties of thermoplastic vulcanizate is strongly influenced by the conditions of the mixing process of raw materials and the compatibility between the phase. The purpose of this study was to determine the optimal temperature, rotor speed and compatibilizer. Thermoplastic vulcanizate was made in two stages. The first stage was the manufacture of rubber compounds using a roll mill at room temperature and speed of 20 rpm. Natural rubber materials used are natural rubber SIR 20. Curative ingredients and additives that are added include filler hybrid Carbon black/fly ash 30 phr, ratio 70/30, 5 phr paraffin, 5 phr ZnO, 3 phr stearic acid, 1 phr TMQ, 0,6 phr MBTS and 3 phr sulfur. The second phase of the resulting rubber compound was mixed with polypropylene (PP) and the compatibilizer maleated natural rubber (MNR) in the internal mixer. Ratio of NR / PP made it 70/30, while the MNR varied 2 and 5 phr. Varying conditions in the mixing process at a temperature of 170oC, 175oC and 180oC and speed of 40, 60 and 80 rpm. The results showed that the morphology and properties of optimal TPV obtained at 175oC temperature, rotor speed of 40 rpm and MNR 5 phr.