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Prasetyo Hermawan
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Arts Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Social Sciences

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PENGGUNAAN NaHSO3 DAN H2O2 UNTUK MENGURANGI KONSENTRASI FORMALDEHID PADA LIMBAH CAIR PENYAMAKAN FORMALDEHID KULIT GOLF SNOW WHITE Prasetyo Hermawan; Titik Anggaraini
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 14 No 2 (2015): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

The effort could be done to reduce formaldehid concentration in the water waste formaldehide glove snow white tannage are react formaldehide with H2O2 and NaHSO3. In this research, mol ratio to formaldTehide in two compound are variation (1: 0,5 , 1:1, 1:2 dan 1:3), then mixing about 1 hour where every 15 minutes we do sampling. The results are more greater mol ratio and time will give more formaldehide concentration could be reduced. From statistic models, shown that mol ratio 1: ½ to 1: 1 not significant in H2O2 compound, in mol ratio 1: 0,5 to 1:1 and 1:1 to1: 2 not significant in NaHSO3 compound. NaHSO3 have more abitllity to reduce formaldehide concentration than H2O2, in mol ratio to formaldehid 1: 3, in 60 minutes shown that 84% formaldehid reduced in NaHSO3 compound and 24% formaldehid reduced in H2O2 compound
STUDI DEPLESI KULIT KAMBING PADA DELIMING MENGGUNAKAN (NH4)2SO4 Prasetyo Hermawan; Alfani Risman Nugroho
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 17 No 1 (2018): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

The purpose of this research is to study depletion on goat skin in the deliming process. The experiment was conducted using (NH4)2SO4 (ammonium sulfate) as deliming agent and using a jar test tool. Tests performed on pelt and liquid characters during the deliming process; pelt weight, pelt thickness, pH and contain nitrogen and sulfide of deliming liquid. Variations made of use (NH4)2SO4 is; 0, ½, 1.0, 1½, 2 and 2½ gr for 50gr of pelt. The results showed that the use of 1 gr (NH4)2SO4 decreases the pH of the liquid deliming pelt Ca(OH)2 from 11.0 to 8.9. Changes in the weight and thickness of pelt Ca(OH)2 in the use of 1gr (NH4)2SO4 are; 11% and 53% respectively. The use of 1gr (NH4)2SO4 and will produce the fastest rate in weight and thickness of pelt Ca(OH)2, namely each; 0.008% weight / minute and 0.02% thick / minute. In addition to 1gr (NH4)2SO4, the deliming liquid of pelt Ca (OH)2 has a final pH of 8.9 and from pelt NaOH has a final pH of 9.12. Pelt Ca(OH)2 on the use of 1gr (NH4)2SO4 has 13% compression and pelt NaOH on the use of 1.5gr (NH4) 2SO4 has compression 8.8%. The greater use of (NH4)2SO4 will produce fluid deliming with character greater nitrogen and sufide levels, except the lower sulfide levels for pelt Ca (OH)2 sulfide.
KARAKTER FISIS KULIT DOMBA SAMAK NABATI MENGGUNAKAN BAHAN PENYAMAK GAMBIR (UNCARIA GAMBIR) Elis Nurbalia; Prasetyo Hermawan
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 17 No 2 (2018): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

The purpose of this study is to determine the physical character of vegetable tanned sheep using gambir (uncaria gambir). Twelve pieces of sheep pikel skin were tanned using 25% vegetable tanning material from three types of gambir (A, B, C) and two kinds of tanning formulations ((Std) and (Std + Aux)). Skin products were tested for physical characteristics (tensile strength, elongation, tear strength, softness and shrinkage temperature). Furthermore the test results were compared with two standard leather products, namely; standard 1 (SNI 06-0237-1989: standard for lining leather) and standard 2 (SNI 4593: 2011: standard for jacket leather). The use of all types of gambir and tanning formulations has produced skin that pass the standards of skin tensile strength, standard 1 (minimum 75 kg / cm2) and standard 2 (minimum 150 kg / cm2). The results of the skin elongation test showed that only the use of gambier A pass the standard 1 (maximum 25%) and only the use of gambier C with tanning formulations (Std + Aux) that did not pass standard 2 (maximum 60%). The results of the use of gambir A produced the highest tensile / elongation ratio, 12.16 kg / cm2for the tanning formulation (Std) and 10.42 kg/cm2for the formulation (Std + Aux). Skin tear strength was not required by standard 1 and all skins pass standard 2 (minimum 12.5 kg / cm). Skin softness was not required by standard 1 and all skins do not pass standard 2 standards (5.0-7.6 mm). The use of gambier B results the highest temperature shrinkage of skin, this was influenced by a high ratio t/nt (1.77) and low gum content (6.15%), the addition of auxiliaries (penetrator and sulphate oil) in the formulation tanning (Std + Aux) increases shrinkage temperature the skin from 760C to 780C.
PEMBUATAN BIOGAS DARI LIMBAH BHO PENYAMAKAN KULIT DENGAN STARTER EFFLUENT DIGESTER AKTIF DAN CO-DIGESTION DENGAN KOTORAN SAPI Swatika Juhana; Prasetyo Hermawan; Wahyu Fajar Winata; Arini Wresta; Ika Yanti
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 19 No 2 (2020): BERKALA PENELITIAN TEKNOLOGI KULIT, SEPATU DAN PRODUK KULIT
Publisher : Politeknik ATK Yogyakarta

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Abstract

ABSTRACT This research aims to utilize BHO tannery liquid waste for biogas production and to examine the effect of active digester effluent on the co-digestion of biogas production by co-digestion of BHO liquid waste and cow manure. The experiment began with an analysis of the character of the leather tanning BHO liquid waste. The biogas production is carried out in batches in an anaerobic biogas digester. The experiment was started by entering raw materials for BHO liquid waste: cow dung: active digester effluent with a ratio of D1 = 4: 2: 0; D2 = 4: 0: 2; D3 = 6: 0: 0. Observation of the addition of gas was carried out by means of a manometer to measure the increase in gas pressure produced in the digester every day until the 15th day. The results of the analysis of BHO wastewater showed high BOD and COD levels, namely 3265 mg / L and 11231.2 mg / L. The results of making biogas show increased gas pressure (gas formation) in digester D1 and D2. The result of D1 (BHO waste without starter) gas production is a lot at the beginning and then decreases. In D2 (BHO waste with the addition of starter and cow dung), it shows that gas production is formed on the 8th day with constant pressure until the 15th day and is still producing. In the D3 digester (BHO liquid waste without a starter and cow dung) no gas is formed.
Co-Authors Alfani Risman Nugroho Arini Wresta Elis Nurbalia IKA YANTI Swatika Juhana Titik Anggaraini Wahyu Fajar Winata