Papers by Keyword: Acid Mine Water

Abstract: Abandoned tin mines produce acid mine drainage in their water basin. If not treated well, it will damage environmental ecosystem by entering rivers or other water bodies. This acid mine drainage is attempted to be remediated by adsorption technique. The adsorbent used in this study is Lightweight Expanded Clay Aggregate (LECA) because its base material is natural clay. LECA is commonly used for hydroponics and constructions. LECA is made from natural clay that being heated at temperature over 1100°C. This study aims to determine how significant LECA in adsorbing metals in acid tin mine drainage. This research used two materials namely LECA and tin acid mine drainage. Both materials were contacted for two days in shaker bath. The results of this study were the adsorbing Fe(II) and Cu(II) on LECA could be approached by the Langmuir-Freundlich (LF) combined model where the C_µ,max are 0.406 and 0.020 mg/g of adsorbent, respectively. Unlike the other two metals, Sn(II) was more likely to experience precipitation instead of adsorption because of increasing of pH value. The conclusion, heavy metals in tin acid mine drainage could be remediated well by using LECA.

Abstract: Ferrovum is a recently found new genus of acidophilic iron-oxidizing bacteria. Ferrovum spp. dominate the microbial community of a pilot plant for biological mine-water treatment and together with some Gallionella relatives appear to be key players of the process. Isolation of Ferrovum strains should greatly be facilitated by a new APPW medium. Sequencing of the genome of Ferrovum sp. JA12 so far did not point to any alternative electron donors and also did not reveal genes for nitrogen fixation.

Abstract: Thespreading of nitrogenous compounds into the environment is a common challenge duringmining industries. Typical explosives used in mining are N-based compoundswhich lead to nitrogen contamination of groundwater and water bodies. In goldextraction, cyanide used as lixiviant is also another source of nitrogen pollution.The present work aims to investigate the effect of heavy metals ondenitrification using batch bioassays. Cu, Ni, Co and Fe influence ondenitrification process was studied at pH 7.0. Below the soluble concentrationof 62 mg/L, Ni did not inhibit denitrification, whereas denitrification wasrepressed at soluble Ni concentration above 62 mg/L. At 122 mg/L of soluble Ni,50% inhibition of denitrification was observed. Below soluble concentration of86 mg/L, Co exerted no inhibitory effect on nitrate removal but moderatelydecreased the denitrification rate. Cu slowed denitrification down resulting in40% of nitrate removal averagely at the soluble concentration below 1 mg/L. Onthe contrary, Fe supplementationresulted in iron oxidation and soluble Fe concentrations ranging from 0.4-1.6mg/L that stimulated denitrification. Thepresent work indicates that denitrification can tolerate heavy metals and canbe suitable for acid mine drainage remediation.

Abstract: The composition of microbial communities in five acid mine water samples were studied, using culture-independent 16S rDNA based cloning and restriction fragment length polymorphism (RFLP) analysis. Phylogenetic analysis revealed that the bacteria in these five samples fell into 4 major groups: Proteobacteria, Nitrospira, Firmicutes and Bacteroidetes. Proteobacteria organisms such as A. ferrooxidans appeared in samples SX3, K1 and K2, but was scarce in samples SX1 and SX2; Nitrospira organisms Leptospirillum ferrooxidans, Leptospirillum ferriphilum and Leptospirillum group III, were prevalent in samples SX1, K1 and K2, but with fewer in samples SX2 and SX3. Archaea were only detected in samples K1 and K2 from the Tong shankou copper mine. Thermoplasma and Ferroplasma lineages were detected abundantly in these two samples. Meanwhile, the results of Principal Component Analysis (PCA) based on the percentages of OTUs and data of biogeochemical parameters, revealed that biogeochemical properties affected the diversity of microbial communities in mine water. The pH, temperature and different concentrations of elements such as S, Ni, Co and Cu seemed to be key factors resulting in the diverse distribution of microbes.

Abstract: For the treatment of acid mine water an in-situ pilot plant with a self-sufficient energy supply and remote data transmission was tested in acidic pit lake 111, a small lake in the Lusatian mining district in Germany. In this paper the design of the enclosure-bioreactor in-lake system, the mode of operation of a three-stage treatment process by the use of anaerobic fixed film reactors and the results of treatment are shown.