Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Info-Teknik
Hesti Wijayanti
PS T. Kimia FT Unlam
Engineering

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Penentuan Koefisien Transfer Massa Ekstraksi Pektin dari Buah Pepaya dalam Larutan HCl Hesti Wijayanti
INFO-TEKNIK Vol 8, No 1 (2007): INFOTEKNIK VOL. 8 NO. 1 2007
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v8i1.1723

Abstract

Indonesia has a great potency of papaya. As long as technology growth and demand in daily needs, its potency can be developed to get more value. One of the best ways is to extract pectin from papaya.This research conducted in order to obtain mass transfer coefficient in pectin extraction from papaya with HCl solution in stirred tank. Variables observed are extraction temperature, stirrer velocity and diameter of papaya powder.Extraction started by heating solution in batch reactor until wanted temperature achieved. Afterward turned on the stirrer motor with certain velocity. During the reaction, the temperature and the velocity of stirrer motor were kept constant. Sample was taken when certain time is reached.From this research, we got relation between mass transfer coefficient in pectin extraction from papaya with HCl solution in stirred tank and its influence variables, that could be written on this equation : = 1.033Or :Sh      = 1.033 ( Re)0.716 (Sc )0.291 ( db/dp )-0.066with average relative error 3.2702 %.
KARBON AKTIF DARI SEKAM PADI : PEMBUATAN DAN KAPASITASNYA UNTUK ADSORPSI LARUTAN ASAM ASETAT Hesti Wijayanti
INFO-TEKNIK Vol 10, No 1 (2009): INFOTEKNIK VOL. 10 NO. 1 2009
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v10i1.1762

Abstract

Activated carbons prepared from rice husks, an agricultural waste by product, have been examined  for the removal of acetic acid from aqueous solutions. The activated carbon was prepared by physical activation. The results show that the Freundlich  isothem model were well fitted rather than Langmuir model. They also indicate that the sorption of  acetic acid is depend on the stirrer velocity as well as on the particle size of the activated carbons.
PENURUNAN ION Fe DAN Mn AIR TANAH KOTA BANJARBARU MENGGUNAKAN TANAH LEMPUNG GAMBUT SEBAGAI ADSORBEN Agus Mirwan; Hesti Wijayanti
INFO-TEKNIK Vol 12, No 1 (2011): INFOTEKNIK VOL. 12 NO. 1 2011
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v12i1.1777

Abstract

Indonesia, particularly Kalimantan island has abundant source of clay peat (CP). CP found as soil grain which is composed by silicon-oxygen tetrahedral and aluminium-oxygen octahedral essential form of very fine mineral. CP has ability in color removal, reducing organic matter and heavy metals which are dissolved in water through adsorption process. This research investigated the influence of adsorbent from natural peat clay, physical activated natural peat clay and chemical activated natural peat clay  with CP depth parameter (2, 3 and 4 meters from the soil surface) in adsorbing Fe and Mn from Banjarbaru groundwater. The chemical activation was done by contacting the clay peat with 0.25 M HCl , while the physical activation by burning clay peat in furnace with a temperature of 600oC for 4 hours  This research conducted by contacting the adsorbent with 1liter of water from Rambai well for 300 minutes. The results showed that the clay peat based on physical activation at a depth of 3 m gave the optimum conditions in reduction Fe, as shown from the values obtained was 0.27 mg/L, whereas chemical activation at a depth of 2 m could reduce Mn to be 0.081 mg/L. 
Co-Authors Agus Mirwan