Pengaruh Penggunaan Fly Ash dan Bottom Ash sebagai Cover dalam Pencegahan Pembentukan Air Asam Tambang Menggunakan Metode Free Draining Column Leach Test

ABSTRAKUpaya pencegahan pembentukan air asam tambang dapat dilakukan dengan metode dry cover yang dilakukan dengan menutup batuan yang berpotensi membentuk asam (PAF) dengan batuan yang tidak berpotensi membentuk asam (NAF). Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan fly ash dan bottom ash sebagai NAF dalam mencegah pembentukan AAT dengan cara mengurangi kontak antara mineral sulfida dengan air dan oksigen. Metode Free Draining Column Leach Test digunakan untuk memprediksi pembentukan AAT yang terbentuk. Simulasi perbedaan perlakuan sampel digunakan dengan 2 variasi pelapisan sampel NAF dan 3 variasi pencampuran sampel NAF. Hasilsimulasi menunjukkan bahwa dengan variasi pelapisan sampel NAF didapatkan kualitas air yang lebih baik. Penggunaan variasi pelapisanmeningkatkan nilai pH, menurunkan nilai TDS serta DHL sebagai hasil oksidasi pirit didalam batuan. Untuk menunjang hasil analisis kualitas air, pengujian statistika juga digunakan untuk mengetahui perbedaan dari variasi penggunaan fly ash dan bottom ash terhadap perubahan nilai pH, TDS dan DHL yang dihasilkan. Kata kunci : Fly ash, Bottom ash, pH, TDS, DHL ABSTRACTAcid mine drainage prevention efforts can be carried out by the method of the dry cover which is done by closing the rock that is potentially acid forming (PAF) with the non-potentially acid forming rock (NAF). This study aims to determine the effect of the fly ash and bottom ash as NAF in preventing the formation of AMD by reduce contact between the sulfide minerals with water and oxygen. The method of Free Draining Column Leach Test is used to predict the formation of AMD formed. Simulated difference in sample treatment is used with 2 variations in the coating samples of NAF and 3 variations of the mixing a sample of NAF. The simulation results show that with the variation of the coating sample of NAF obtained better water quality. The use of variations of the coating increases pH value, lower the value of TDS as well as DHL as a result of oxidation of pyrite. To support the results of water quality analysis, the statistics test is also used to determine the difference from the variation of the use of fly ash and bottom ash to change the pH value, TDS and DHL that is produced.Keywords: Fly ash, Bottom ash, pH, TDS, DHL

BREEDING AND BIOCHEMICAL CHARACTERISTICS OF FORMS OF ALLIUM CREATED ON THE BASIS OF INTERSPECIFIC HYBRIDIZATION

One of the most important crops among all types of Alliums is onion, the value of which is determined by the nutritional and medicinal properties. It is used not only as a seasoning for food, but also as a source of a number of biologically active substances. The biochemical composition of the bulbs and its green leaves in different periods of growth and development varies, depending on the variety, environmental conditions and agrotechnical methods of cultivation. Creation on the basis of interspecies hybridization of fundamentally new forms of Allium plants with a unique combination of genetic material allows to expand the possibility of selection of valuable genotypes in practical terms. The study was performed on plants of the inbred progenies I4-5 from BC1-2 bulbous forms of interspecific hybrids of Allium crossing combinations F5(A. cepa xA. vavilovii), F5(A. cepa x A. fistulosum). The biometric assessment was carried out after harvesting and drying the bulbs according to the "test Procedure for distinctiveness, uniformity and stability" according to the main breeding characteristics: the color of the dry cover scales of the bulb, the mass of the bulb, the shape of the bulb. As the standard used plant varieties Odintsovets. The biochemical composition of onion samples was determined by the content of dry matter, monosaccharides, the amount of sugars, ascorbic acid, antioxidants. Based on the biometric assessment of the forms of interspecific hybrids of onions, 5 forms were identified according to the uniformity of such features as the color of dry cover scales and the shape of the bulb weighing 50-60 g, which are a qualitatively new source material for breeding. In determining the biochemical composition of the isolated forms of interspecific hybrids of Alliums on the main breeding grounds found that the plants of these forms of onions indicators of dry matter (15%), monosaccharides (1.15-1.71%), the amount of sugars (11.17%), were at the level of the standard, or exceeded it, but the total content of antioxidants (8.22 mg/g) inferior to the standard.

KAJIAN PENANGGULANGAN AIR ASAM TAMBANG PADA SALAH SATU PERUSAHAAN PEMEGANG IJIN USAHA PERTAMBANGAN DI DESA LEMO, KABUPATEN BARITO UTARA, KALIMANTAN TENGAH

This study aims to know the factors that cause the formation of Acid Mine Water, to analyze the methods of prevention of acid mine drainage has been running effectively, to analyze how to prevent the formation of acid mine water at the research area. This research was conducted atLemovillage,North Barito Regency. These results indicate the analysis of water quality in the company with an indication acidic low pH values and high metal values. It is supported by soil pH test results showed low pH, especially on the layer in direct contact or close to coal. Sources of acid mine drainage at the company are from the oxidation of water and oxygen on the wall of rock at pit, water from the dumping area, water flowing from the temporary stockpile into the settling pond 2. From these, we can conclude the results. Recommendations prevention of acid mine drainage can be done by moving the location of the temporary stockpile in accordance with, more effective functioning of sump, controlling the movement of acidic water that has formed, accommodate and neutralize the acidic water that has formed, forming a layer of dry cover, separating the flow of water is not acidic and acidic