Amalgamation in the processing of community gold mines may leave slurry waste with the potential for heavy metal contamination of the environment. Technical studies for handling these wastes are very necessary to process the waste using a simple and applicable manner in the community. The purpose of this study was to examine the coagulation-adsorption technique of liquid waste from the amalgamation process. Slurry waste samples from the amalgamation process were collected from amalgamation sites in Boto Village, Wonogiri regency which had the highest Hg and Pb levels in the slurry. The coagulation-adsorption process is carried out by a continuous process with the gravitational flow because the area of the amalgamation process has a steep slope. Coagulation of particles in the slurry used two kinds of natural ingredients, i.e. papaya seed, and moringa seed extracts. The adsorption was conducted using two types of minerals, i.e. Ca-bentonite and zeolite which had been activated. The results of this study showed that the coagulation process was a simple process to purify amalgamation slurry waste and reduce the levels of Fe, Mn, Hg, and Pb metals. Then the following step by using the absorption process to produce clear water from amalgamation liquid waste and reduce the levels of Fe and Mn metals. Coagulation using papaya seeds might purify amalgamation slurry waste and reduce heavy metal content of Fe 99.996%; Mn 99.994%; Pb 100%; Hg 100%. Based on these results, the Hg and Pb metals were metals that were very easy to settle. Adsorption on the liquid result of the coagulation process using unactivated zeolite reduced the metal content of Fe> 99.40% and Mn> 88.69%.
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.
Pada danau bekas tambang feldspar dipenuhi oleh air limpasan yangberpotensi mencemari lingkungan. Selama masa pascatambangdiperlukan pengelolaan kualitas air. Salah satu cara pengelolaan kualitasair yaitu remediasi pasif dengan menggunakan sistem wetland. Salahsatu aspek yang penting dalam desain wetland adalah aspek hidrologi.Air pada permukaan pada tambang terbuka bersumber dari air hujan.Wetland merupakan suatu fasilitas pengelolaan air buatan yang dangkaldengan menggunakan tanaman air. Prinsip wetland ialah menghilangkanpolutan dengan mempertimbangkan kondisi hidrologi setempat.Penelitian ini bertujuan untuk mengetahui besarnya debit air limpasanyang menuju desain wetland, serta untuk mengetahui luasan minimumkompartemen dari rencana desain wetland. Dalam penelitian inimenggunakan metode pengumpulan data, kemudian peneliti melakukananalisis intensitas curah hujan, luas daerah tangkapan hujan, kondisidanau bekas tambang, arah aliran air limpasan, analisis debit airlimpasan, dan analisis dimensi danau bekas tambang. Hasil penelitianmenunjukkan bahwa debit air limpasan hasil perhitungan sebesar 0,35m³/detik dan luas minimum kompartemen desain wetland hasilperhitungan yaitu sebesar 137 m2tiap kompartemen.
Kegiatan pertambangan memberikan dampak positif dan negatif, dampak positifnya adalah bahan galian yang diambil dapat dimanfaatkan untuk memenuhi kebutuhan manusia dalam membangun infrastruktur dan sarana prasarana. Dampak negatif dari kegiatan pertambangan adalah terjadinya perubahan bentuk lahan yang ada pada kawasan pertambangan dimana dari perubahan bentuk lahan tersebut pada umumnya mengakibatkan erosi dan gerakan massa tanah. Masalah yang terjadi di lokasi penelitian ialah tingkat erosi tanah yang tinggi akibat tidak adanya vegetasi dan penyebaran laju erosi diakibatkan oleh degradasi lahan. Penelitian ini dilakukan untuk mengetahui tingkat erosi yang terjadi dan laju erosi tanah serta arahan untuk melakukan konservasi di sekitar area penambangan dengan melihat parameter erosivitas hujan (R), erodibilitas tanah (K), panjang dan kemiringan lereng (LS), praktik pengelolaan lahan (P), serta praktik pengelolaan tanaman (C), sehingga dapat mengetahui tingkat erosi dan arah penyebaran erosi yang terjadi di daerah penelitian dengan menggunakan pendekatan metode USLE serta memberikan arahan untuk melakukan konservasi lahan. hasil penelitian menunjukkan bahwa metode USLE menghasilkan 19 kelas tingkat bahaya erosi yang sangat berat, 2 kelas erosi sedang 4 kelas ringan, dan 1 kelas erosi sangat ringan
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