Acid mine drainage is acidic water that arises as a result of mining activities. Acidic water has a high acidity, which is often characterized by a low pH and contains high levels of heavy metals Fe and Mn. The purpose of this study was to determine the effect of activated carbon on the adsorption process and the effect of mass of activated carbon on eggshells. The method used in this research is the adsorption method using activated carbon of eggshell which is physically and chemically activated. This study used a mass variation of 5, 10, 15 and 20 grams with a contact time of 30 minutes and an adsorbent size of 200 mesh. The parameters studied were heavy metals iron (Fe) and manganese (Mn). The initial concentration of Fe acid mine waste was 29.179 mg/L, and Mn was 7.9692 mg/L. The results showed that the mass of activated carbon had an effect on decreasing the levels of Fe and Mn metals. On physical activation the average decrease in Fe metal was 99.50% and Mn metal was 53.21%, while on chemical activation the average decrease in Fe metal was 97.72% and Mn metal was 97.97%.Keywords: Acid mine water, Fe, Mn, Activated carbon, egg shell
Integrated Master-Doctor program for excellent undergraduate student (Pendidikan Magister Menuju Doktor untuk Sarjana Unggul hereafter PMDSU) is a government program in the effort to increase the number of doctors and the number of international publications for doctoral supervisors in Indonesia. The program has been running since 2013 and has received students in 4 batches until 2018. Based on the year of entry, PMDSU batch I should have completed the study and PMDSU batch II has entered its final year. From that endeavour, this paper describes the achievements of PMDSU student and supervisor’s publications. The hypothesis raised is the number of publications and supervisor’s h-index influences the number of joint scientific publications between students and supervisor for batch I and II. PMDSU students and supervisors batch I and batch II are spread across 12 educational institutions in Indonesia. The findings show that the highest number of student’s publication is 17 articles. The level of participation of PMDSU students in scientific articles reaches 60% of 323 registered students. Based on student participation, an increase in the number of supervisor’s scientific articles was influenced weakly by the participation of PMDSU students. At the other hand, the supervisor’s h-index is also very weak in influencing the number of publications published by PMDSU students. Based on the results obtained, student’s participation can slightly increase the number of supervisor scientific articles, and the supervisor’s h-index has no relation to the number of publications published by PMDSU students.
Research on the application of the OHS system is carried out with the aim of analyzing things in the application of K3. The research method uses a descriptive method in the form of a questionnaire. The results of the research questionnaire the highest percentage included in the strength (strenght) including the use of PPE 83.9% agreed that it was applied followed in an orderly manner, promotions and strategies and the application of K3 64.5% strongly agreed, the existence of PPE training that was applied 74.2% agree. The results of the weakness analysis (Weakness) that the highest percentage of the results of the questionnaire diagram are incomplete first aid facilities 80% agree, the workplace is not conducive, planning for implementing K3 strategies, providing emergency facilities for accidents 83.9%, periodic initial checks to employees 74.2% quite agree.
The demand of the fuel oil in the world increasing with the rate population and industrial growth. The alternative solid fuel which is the main ingredient of that is coal, contains the high calorific value so that it can be replaced petroleum product and be used is briquette. In this study conducted proximate test on non-carbonized coal briquettes beetwen tapioca adhesive and Sago adhesive. In the study, the methods used approach issues of extracting research from established theories and data of observed objects. The analysis result of proximate test briquettes coal with tapioca adhesive on Balikpapan Formation, pulau balang Formation, kampung baru formation obtained the value of IM is 11,68% - 24,48 %, AC is 2,62 - 5,68 %, VM is 39,40 - 52,49 %, and FC is 12,95 - 46,32 %. whereas on coal briquettes with Sago adhesive on Balikpapan Formation, pulau balang Formation, kampung baru formation obtained the value IM is 13,11 - 30,57 % on, AC is 3,71 - 5,75 %, VM is 47,83 - 53,22 %, and FC is 10,47 - 41,34 %.
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