Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry)
Not a member yet
300 research outputs found
Sort by
EFFECT OF OZONIZATION ON COD AND BOD5 VALUES OF WASTEWATER FROM DETERGENT MANUFACTURER
No full textThe aim of this experiments were to examine the effect of ozonizotion on COD and BOD5 value of wastewater from a detergent manufacturer and to put forward the efficiency of COD and BOD5 removal as a function of the ozonization. It has been known that the detergent industry produces wastewater with high concentration of both COD and BOD5. The observation showed that the ozonization alone was not a practical approachfor COD and BOD5 removal. However, the role of ozonization as a preliminary process before the biological one seems to be significant
PENGARUH AIR DALAM AMPAS TEBU TERHADAP KECEPATAN PENYALAAN DALAM PEMBAKAR PUTAR
Get PDFThe pyrolysis of sugar cane bagasse at peak temperatures between 300 and 1100 "C and at heating rates of 200 - 10,000 Cjs produced water, primary tar, C02 and char. Further decomposition of the primary tar resulted gases and secondary tar. The conversion of dry bagasse to volatile materials was 91.6 %. Bagasse water content influenced the pyrolysisproducts composition. It decreased the maximum yield of secondary tar from 50.6 to 39.8 %, increased total gas yield from 34.5 to 54.7 % and ultimate char yield from 8.4 to 11.7 % (of theinitial dry sample weight). For combustion engineeringpurposes, a singlefirst order reaction model with E = 12.9 kcai/mole, A = 3.33 x 1& s1 and W = 88.7 % was a suitable model to predict bagasse pyrolysis reaction rate based on the total weight loss data. The calculation indicated that water in bagasse-decreasedignition rate in a bagasse swirl burner
PEMURNIAN GLUKOAMILASE DARI HASIL FERMENTASI KAPANG RHIZOPUS ORYZAE
No full textPurification of the glucoamylase R. oryzae was carried out by addition of ammonium sulfate 80% saturation, on the fermentation broth at 4C. The precipitate formed by centrifugation at 9000 rpm was then dialyzed in buffer solution and then concentrated using freeze dryer. It was found that the specific activity of the enzyme was around three-fold higher the crudeenzyme from fermentation broth and the purity of the enzyme was almost twelve-fold.purer than the crude enzyme. The molecular weight of the glucoamylase was found to be 36,000 as determined by SDS gel electrophoresis. The optimum pH witli soluble starch as substrate was at pH 4.5 and the optimum temperature was 55C while the Km Value was 0.027%
KARAKTERISASI POLIMER BAHAN ADESIF UNTUK KULIT DAN PLASTIK
No full textCharacterization of polymer of five commercially available elastomeric adhesives claimed 'suitable for leather and plastics had been conducted. Polymer samples were isolated from adhesive solutions by precipitation, and then characterized through FTIR spectroscopy, viscometry, GPC and thermal analysis. The FTIR spectrogram, indicate that five different samples of adhesives contained polychloroprene. Thermal analysis indicated similar glass transition points (Tg) of -40 to -43C and three of them indicated the second glass transitions at 1.4; 3.6 and 13.5C, Five adhesives indicated melting points (Tm) of polymers at 43 - 48C, The average viscosity molecular weight (Mv) indicated two groups; i.e. Mv: 115,000 - 146,000 and Mv : 357,000 - 425,000. From secondary sources, polychloroprene has solubility parameter 8= 8.2 - 9.4 (cal em -3)0.5 or 16.74 - 19.13 (kJ m-3)0.5 and critical surface tension Yc = 38 dyne cmr-1 or mN m-1
EFFECT OF POLYVINYLPYRROLIDONE ADDITIVE ON MEMBRANE CHARACTERISTICS IN THE PREPARATION OF POLYETHERSULFONE HOLLOW FIBER MEMBRANE
No full textPreparation by applying the dry - wet spinning method and characterization of polyethersulfone (PES) hollow fiber membranes for ultrafiltration purpose have been studied. The characteristics of the hallow fibers studied include water flux, rejection rate, molecular weight cut - off and cross section structure. The membrane was prepared using the dope solution composition of 20% PES, 6% Polyvinylpyrrolidone (PVP) and 74% of n-Methyl Pyrrolidone as solvent. The effect of molecular weight of PVP and the small amount of water added in the dope solution have also been studied. The results show that increasing the molecular weight of PVP in the dope solution will decrease the rejection coefficient of the membrane towards dextran solution. Effect of a small amount of water in the dope solution as wetting agent is not obvious as indicated by the fluctuations in the results. Higher operating pressure during ultrafiltration process give higher water flux, but the effect on membrane rejection is not clear. By taking the rejection coefficient as 90 %, the molecular weight cut-off of the hallow fiber prepared are 40,000; 80,000; 25,000 and 110,000
PENGARUH KONVEKSI MOLEKUL TERHADAP DISTRIBUSI WAKTU TINGGAL
Get PDFResidence Time Distribution studies were performed in a continuous vertical Couette Flow device under the conditions of negligible molecular diffusion. Most of the experiments were carried out in the laminar flow region. Diethylene glycol (DEC, 'Analar grade', BDH, Poole) were used as the flowing fluid. 1% Congo red dye solution in DEC was used as the tracer and it was injected as an impulse input through the injection port situated at the bottom of the device. The temperature was maintained at 20C during the course of the experiments. The responses were analyzed using the mixing cup technique. The C-curves obtained were analyzed theoretically using the equation originally derived for flow through annulus. Such an approach was applied since both Couette and annular flow device have similar geometry. The responses of the secondary flow induced by the cylinder rotation at Tas>Tac were expected to be observed as the curve change from the curve characterizes the laminar flow through annulus to normal distribution
PENINGKATAN NILAI DAYA CERNA DAN ENERGI METABOLISME NITROGEN TERKOREKSI BIJI KACANG Vicia faba var. Diana MELALUI PENYINARAN DENGAN SINAR INFRA MERAH
Get PDFDetermination of the apparent digestibility by the difference method has been performed in order to ascertain the influence of infra-red treatment on the nutritional effect of legume seeds Vicia faba L. var. Diana. For the test, a total 0f 96 five-week old male chicks of LSL-Brown were kept in a full automatically adjustable climate conditioned room. The digestion test consisted of eight rations in mash form (1 basal ration and 7 test rations). The water was offered ad libitum. The duration of adaptation period was 4 days, the preliminary period was 3 days, and the main experimental period was 4 days, repective/y. The results of this experiment indicated a significant increase (p<0.05) of nutrient digestibility of legume seeds treated by infrared level 2 (80 seconds, seeds temperature 105C) for dry matter (+14.6%), organic matter (+17.6%), starch (+16.5%), nitrogen free extract (+11.6%), lysine (+4.2%), threonine (+5.3%), and cystine (+11.9%). The value of nitrogen balance increased from 479,7 mg Niday to 622,3 mg Niday. An increase 0f N corrected meta-bolizable energy of the seeds from 10.67 MJ/kg DM to 11.95 MJ/kg DM was observed
KARAKTERISASI BENTONIT PACITAN
No full textBentonite is high plastivity and colloidal clay which contains smectite(montmorillonite) mineral as major the component. Commercially, there are two kinds of bentonite, which are calcium bentonite and sodium ben-tonite. Results of DTA, XRD and IR analysis on Pacitan bentonite, show that the major component is montmorillonite mixed with a little quartz. Cation exchange capacity (CEC), specific gravity, surface area, pore volume and swelling index of this bentonite are 45,98-62.42 meq/100 gram; 2,14-2,28 g/mL; 641,44-737,29 m /gram; 0,88-1,25 mL/gram and 78,95-163,16 %, respectively. Based on XRD and CEC value Pacitan bentonites are of the calcium bentonite type
