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All Journal Scientific Contributions Oil and Gas
Sri Kadarwati
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
Chemical Engineering, Chemistry & Bioengineering Energy

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STUDY ON THE EFFECT OF BIOCIDE ON MORPHOLOGY AND STRUCTURE OF PAECILOMYCES SP. BY USING TEM AND SEM Sri Kadarwati; Evita H. Legowo
Scientific Contributions Oil and Gas Vol 26 No 2 (2003)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.26.2.998

Abstract

Fungi is one of the types of microbe that can grow in avtur and can give a serious effect, causing fatal accident due to fuel system clogging.
EFFECT OF BIOSURFACTANT PRODUCED BY BACILLUS IN OILY WASTEWATER DEGRADATION Sri Kadarwati; Leni Herlina
Scientific Contributions Oil and Gas Vol 31 No 3 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.3.1015

Abstract

Liquid waste from oil industry activities has potential cause environmental pollution. These liquid wastes, containing hydrocarbon and heavy metals, are mostly toxic. Therefore, biotechnology by means of biological treatment can be applied for decomposing the toxic liquid wastes. The biosurfactant production from some microorganisms can support hydrocarbon degradation. The objective of this study is to examine the crude biosurfactant that is extracted from the selected Bacillus which was precipitated by using methanol on acid moiety. The crude biosurfactant extract were tested to support hydrocarbon degradation. Three species of Bacillus used in this experiment were compared based on their respective biosurfactant production. The results showed that the percentage of hydrocarbon degradation on liquid waste from refinery by the three Bacillus species were 90.23% (Bacillus subtilis), 88.72% (Bacillus licheniformis), and 73.43% (Bacillus laterosporus). The concentration of remaining oil after 28 days was 20.44 mg/L, 23.38 mg/L, and 54.87 mg/L, respectively. The decrease of COD were 84.90%, 84.04%, and 80.68%, respectively, and the COD value after 28 days treatment were 165 mg/L, 174 mg/L, and 211 mg/L.
MICROBIAL EOR STUDY TO IMPROVE SWEEP EFFICIENCY IN CALTEX FIELDS PHASE 1 – NUTRIENT SELECTION Sri Kadarwati; M. Udiharto; Noegroho Hadi Hs; Joseph P. Brinkman; Bangun Yulianto
Scientific Contributions Oil and Gas Vol 25 No 2 (2002)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.25.2.1067

Abstract

The objective of this research is to find a cost effective nutrient that will stimulate the growth of in-situ microbes in Caltex Pacific Indonesia (CPI) oil fields to create sufficient biological products to plug high-permeability reservoir thief zones. If successful, injection fluids may be diverted into unswept regions of the reservoir, increasing the sweep efficiency und extending the production life of watered- out oil fields. This paper describes how a wide range of nutrients were researched and tested in the laboratory to achieve the objective. The primary findings of this study show that several primary nutrients were successful at creating bioproducts at high temperature, low salinity, reservoir conditions, and that molasses may be the most cost effective nutrient for all three CPI waterflooded reservoirs tested: Balam South, Bangko, and Minas fields. As a result of this work, laboratory studies were started to see to if the microbial growth created in laboratory test tubes can be recreated within reservoir core plugs to achieve sufficient permeability reduction to justify field trial (s). The core flood process and techniques will be presented in a separate paper.
Co-Authors Bangun Yulianto Evita H. Legowo Joseph P. Brinkman Leni Herlina M. Udiharto Noegroho Hadi Hs