International Journal on Advanced Science, Engineering and Information Technology, Vol. 11 (2021) No. 6, pages: 2261-2270, DOI:10.18517/ijaseit.11.6.13043

The Reduction of TDS, COD, and Oil-and-Fats in Produced Water by Pre-Treatment Process Using Electrocoagulants in the Oil and Gas Industry of South Sumatra, Indonesia

- Surahman, Muhammad Said, David Bahrin

Abstract

Produced water is one of the largest wastes generated by the oil and gas industry. Produced water is waste with a mixture of several organic and inorganic compounds. The increasing volume of wastewater produced in several countries this decade impacts the environment, creating its problems. Some of the produced water is treated conventionally and modernly, including physical, chemical, and biological treatment. This study uses the electrocoagulation method in treating produced water in the Talang Jimar structure of the oil and gas industry in South Sumatra, Indonesia. This study aims to determine the factors of surface area, voltage, and time of electrocoagulation in reducing COD, TDS, and oil-and-fats levels in produced water under the quality standards required by the government. The results of this study indicate the electrocoagulation process in producing the obtained water. The efficiency of electrode reduction with a surface area of 38.4 mm2 is the best COD reduction occurs at a voltage of 9 conditions of 90 minutes, reaching 88.07%. The best decrease in TDS at a voltage of 9 conditions of 90 minutes reached 31.29%. The best reduction in oil and fat occurred at a voltage of 12 of 30 minutes, reaching 96.98%. Meanwhile, the reduced efficiency of the electrode decreased with a surface area of 78 mm2; the best COD reduction occurred at a voltage of 9 conditions of 90 minutes, reaching 92.95%. The best decrease in TDS occurred at a voltage of 9 conditions of 90 minutes, reaching 36.25%. The best reduction in oil and fats occurred at voltage 12 for 90 minutes or 98.56%.

Keywords:

Electrocoagulation; produced water; oil-and-gas; COD; TDS; oil-and-fats; electrodes; surface area.

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