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All Journal INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Indonesian Mining and Energy Journal
Abfertiawan, Muhammad Sonny
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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From Acidic Water to Neutralization Process: Unravelling the Efficacy and Stability of Alkaline Agents for Acid Mine Drainage Abfertiawan, Muhammad Sonny
Indonesian Mining and Energy Journal Vol. 7 No. 2 (2024): November
Publisher : Program Studi Teknik Pertambangan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/imej.v7i2.22625

Abstract

Acid mine drainage (AMD) arises as a major environmental challenge in the mining industry, resulting from the reaction of sulphide minerals with oxygen and water to produce sulfuric acid. Evaluating and optimizing AMD neutralization methods is crucial for mitigating its environmental impact. This study assessed the effectiveness and stability of alkaline agents for neutralization, comparing caustic soda and hydrated lime in bench-scale laboratory experiments. Jar tests were performed by rapid mixing at 120 rpm for one minute, followed by slow mixing at 60 rpm for 20 minutes. The experiments showed increased AMD's pH after contact with neutralizing agents. The optimal doses were 815 mg/L for caustic soda, 1200 mg/L for hydrated lime, and 800 mg/L for a combination of 18%w/w hydrated lime and 82%w/w caustic soda. The stability of the neutralization process, evaluated using pH as an indicator, varied in the following order: hydrated lime, combination, and caustic soda. Hydrated lime demonstrated better stability than caustic soda. Interestingly, caustic soda caused a more rapid pH change when reintroducing AMD. This study provides insights into effective alkaline agents for the mining industry.
STATISTICAL ANALYSIS IN SELECTING THE BEST ELECTRODE BETWEEN ALUMINUM AND IRON IN TSS REMOVAL USING ELECTROCOAGULATION Syafila, Mindriany; Abfertiawan, Muhammad Sonny; Handajani, Marisa; Hasan, Faiz; Oktaviani, Hanifah; Arifianingsih, Nur Novilina
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 6, NUMBER 2, OCTOBER 2023
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v6i2.17835

Abstract

Indonesia is a country that has considerable coal reserves with coal resources of 149.01 billion tons. One of the problems of coal mining is turbidity. The turbidity is caused by the excavation of the open pit mine so that rainwater contact with the main wall. So that mud is formed, which can increase turbidity levels. The concentration of Total Suspended Solids (TSS) due to this phenomenon reaches 5,400 mg/L. Aim: This study aims to set aside TSS by electrocoagulation processing method using a batch system with eight pairs of iron electrodes arranged monopolarly. Methodology and Results: Comparisons using statistically independent t-tests showed that there was no significant difference between the iron and aluminium electrodes in the pH parameter. Conclusion, significance, and impact study:There were significant differences between iron and aluminum electrodes in the parameters of TDS and TSS. In the measured TDS and TSS parameters, the electrocoagulation process using iron electrodes has a higher value than aluminum electrodes. In the TSS removal, there is no significant difference between the two electrodes (iron and aluminium).
Co-Authors Hasan, Faiz Marisa Handajani Mindriany Syafila Nur Novilina Arifianingsih Oktaviani, Hanifah