Acid mine drainage for Fe and Mn metals have a negative impact on the environment. This study studies the use of calcium oxide and fly ash as adsorbents, used to absorb Fe and Mn metals contained in acid mine drainage. This study aims to analyze the effectiveness of Calcium Oxide and fly ash as adsorbents, that an adsorbent of Fe and Mn metals in acid mine drainage. The method used is experimental with a laboratory scale, the test is carried out by adsorption using a batch system. Magnetic stirrer is used as a stirring medium in the adsorption process. Calcium oxide with various doses (0.1; 0.2; 0.3 grams) and fly ash with various doses (10; 14; 17 grams) were mixed with 250 ml acid mine drainage, then stirred at a speed of 150 rpm and (30; 60; 90 minutes) stirring time. The characterization of the adsorbent was carried out by SEM testing. The results show that fly ash adsorbent has a better adsorption effectiveness than calcium oxide. The effectiveness of Fe is 85.35% and Mn 78.14%. While calcium oxide has the effectiveness of Fe 72.91% and Mn 61.81%. SEM testing of holes that increase and enlarge after adsorption, as well as the filling of the cavity by the material indicates the success of the adsorption process.

Acid mine drainage has a negative impact on the environment. Adsorption is an effective and efficient method for acid mine drainage treatment, besides that adsorption does not have a negative impact on the environment. This study aims to analyze the ability of fly ash from a steam power plant as an adsorbent in acid mine drainage treatment. Using experimental methods and batch adsorption mechanisms, with variations of adsorption parameters carried out including adsorbent dose, stirring time, and stirring speed. The test results show that fly ash is very effective in acid mine drainage treatment. Where there is an increase in pH and a decrease in the concentration of Mn and Fe metals in acid mine drainage to match the quality standard. The increase in pH was in the range of 6.3 to 7.4 with the highest effectiveness of 54.05%. In the reduction of Mnmetalthe highest effectiveness was 78.14%, while in Fe metal the highest effectiveness was 85.83%. Fly ash can be used and is very useful in reducing the impact on public health.

AbstrakPenelitian bertujuan untuk mengetahui dominasi kerja otak kiri dan kanan. Metode penelitian yang digunakan adalah deskriptif kuantitatif. Populasi penelitian adalah mahasiswa kebidanan yang belajar Etika dan Hukum Kesehatan berjumlah 40 orang dan semuanya dijadikan sebagai sampel. Responden penelitian diarahkan pada penyelesaian kasus-kasus yang berkaitan dengan pekerjaan yang menjadi profesi. Teknik pengumpulan data menggunakan kuesioner dalam bentuk pretest dan posttest. Teknik analisis data yang digunakan adalah analisis deskriptif. Hasil penelitian menunjukkan pada posttest terjadi perubahan kerja otak kiri dan kanan ke arah berimbang secara bertahap. Diperlukan pemahaman dan peningkatan kreativitas kecerdasan otak secara bertahap agar dapat meningkatkan dan menyeimbangkan kemampuan otak.   AbstractThis research aimed to determine the dominance of the left and right brain. The research method used descriptive quantitative. The population of this research was midwifery students who study Ethics and Health Law, totaling 40 people and all of them as samples. Research respondents were directed at solving cases related to work that is a profession. Data collection techniques used questionnaires in the form of pretest and posttest. The data analysis technique used descriptive analysis. The results showed that in the posttest there was a gradual change in the work of the left and right brain in a balanced direction. It is necessary to understand and increase the creativity of brain intelligence gradually in order to improve and balance the ability of the brain.