Bioremediation process and bioremoval mechanism of heavy metal ions in acidic mine drainage

The aim of the study is to investigate removal of Cu, Ni, Zn, Cd and Pb in acid mine drainage (AMD) using modified oxygen releasing compounds (MORCs) of which CaO2 is the main ingredient. When the MORCs are placed into AMDs, OH- will be released gently and continuously which can neutralize H+ and precipitate heavy metal ions as hydroxide/carbonates. Four types of artificial AMDs contained Cu, Ni, Zn, Cd and Pb ions with/without sulfate were prepared in the laboratory. The removal rates of the heavy metals were measured after adding MORCs to the artificial AMDs. The results showed that the removal rates of Cu, Ni, Zn, Cd and Pb in all 4 artificial AMDs, after 72 hours, are more than 97%, even to 100%. However, after 96 hours, Cu, Ni, Zn, Cd and Pb deposits can be re-dissolved by 16.4%, 11.2%, 7.0%, 5.0% and 4.8%, respectively, in the single-metal artificial AMDs; Pb and Cd deposits are more stable. Sulfate in the multi-metal artificial AMD hardly has effects on re-dissolution of the heavy metal deposits; and only Ni deposits in the single-metal AMD with sulfate and Cu deposits in the single-metal AMD without sulfate are re-dissolved significantly. It suggested that the MORCs should be an efficient material to remove Cu, Ni, Zn, Cd and Pb from AMDs after 72 hours than lime or limestone.

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Heavy metal ions adsorption from mine waters by sawdust

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq0904237s ◽

2009 ◽

Vol 15 (4) ◽

pp. 237-249 ◽

Cited By ~ 21

Author(s):

Velizar Stankovic ◽

Dragana Bozic ◽

Milan Gorgievski ◽

G. Bogdanovic

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Mine Water ◽

Heavy Metal Ions ◽

Mine Drainage ◽

Copper Ions ◽

Supporting Electrolyte ◽

Mine Waters ◽

Copper Mine ◽

Column Adsorption

In this work the results on the batch and column adsorption of copper and some associated ions by employing linden and poplar sawdust as a low-cost adsorbent are presented. The mine water from a local abandoned copper mine, as well as synthetic solutions of those ions which are the main constituents of the mine water were both used as a model-system in this study. The adsorption ability of the chosen sawdust to adsorb heavy metal ions is considered as a function of the initial pH of the solution and kind of metal ions. At lower pH of solutions the adsorption percentage (AD %) decreases leading to a zero AD % at pH < 1.1. Maximum AD % is achieved at 3.5 < pH < 5. It was found that poplar and linden sawdust have both almost equal adsorption capacities against copper ions. The highest AD % ( ?80%) was achieved for Cu2+, while for Fe2+ it was slightly above 10%. The other considered ions (Zn2+ and Mn2+) were within this interval. The results obtained in the batch mode were verified through the column test by using the real mine water originating from an acid mine drainage (AMD) of the copper mine 'Cerovo', RTB Bor. The breakthrough curves are presented as a function of the aqueous phase volume passed through the column allowing having an insight into the column adsorption features. Breakthrough points were determined for copper, manganese and zinc ions. A very high adsorption degree - higher than 99% was achieved in these experiments for all mentioned ions. After completing the adsorption, instead of desorption, the loaded sawdust was drained, dried and burned; the copper bearing ash was then leached with a controlled volume of sulphuric acid solution to concentrate copper therein. The obtained leach solution had the concentration of copper higher than 15 g dm-3 and the amount of H2SO4 high enough to serve as a supporting electrolyte suitable to be treated by the electrowinning for recovery of copper. The technology process based on the column adsorption is proposed and discussed.

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Adsorption Kinetics of Fe and Mn with Using Fly Ash from PT Semen Baturaja in Acid Mine Drainage

Indonesian Journal of Environmental Management and Sustainability ◽

10.26554/ijems.2017.1.1.11-14 ◽

2017 ◽

Vol 1 (1) ◽

Author(s):

Indah Purnamasari ◽

Endang Supraptiah

Keyword(s):

Heavy Metal ◽

Fly Ash ◽

Acid Mine Drainage ◽

Metal Ions ◽

Heavy Metal Ions ◽

Mine Drainage ◽

Coal Fly Ash ◽

Adsorption Model ◽

Acid Mine ◽

Fe And Mn

One used method to reduce heavy metal ions in acid mine drainage is to adsorb them by coal fly ash. This research aimed to study the isotherms equilibrium and the adsorpstion kinetics that fit with decreasing metals ion. Acid mine draigane and fly ash were charge into batch coloumn adsorption with specified comparison. Variables investigated were dactivated and activated fly ash, adsorption times (0, 20, 30, 40,50, and 60 minutes), adsorben weights (10, 20, 30, 40, 50, and 60 gram), and pH (1, 3, 5, 7, and 9). The results showed that fly ash can be used to reduce the levels of heavy metal ions Fe and Mn. Coal fly ash adsorption model of acid mine drainage fits to Freundlich adsorption isotherm in all condition. First order pseudo model kinetics is suitable for Fe and Mn adsorption processes. The value of adsorpsi rate constants vary around : Fe and Mn (deactivated fly ash) 0.2388 min-1 with R2 = 0.4455 and 0.4173 min-1 with R2 = 0.9781, Fe and Mn (activated fly ash) 0.5043 min-1 dengan R2 = 1 and 0.2027 min-1 with R2 = 0.8803.

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Ferrite Process; Heavy Metal Ions Treatment System

Water Science & Technology ◽

10.2166/wst.1991.0645 ◽

1991 ◽

Vol 23 (10-12) ◽

pp. 1893-1900 ◽

Cited By ~ 52

Author(s):

Y. Tamaura ◽

T. Katsura ◽

S. Rojarayanont ◽

T. Yoshida ◽

H. Abe

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Mine Drainage ◽

Lattice Points ◽

Treatment System ◽

Waste Waters ◽

Formation Reaction ◽

Reaction Solution ◽

Laboratory Waste

The principle of the “Ferrite Process”, heavy metal ions treatment system, and the practically operated systems are presented. In the “Ferrite Process”, the heavy metal ions are incorporated into the lattice points of the ferrites in the course of the formation of the spinel structure by the oxidation of the Fe(II) ions. The ferrite formation reaction proceeds in two paths depending on the reaction pH; 1) the green rust path (pH 7-10), and 2) the γ-FeO(OH) path (pH 10.5-11). The mole ratio of the heavy metal ions incorporated into the lattice points to the Fetotal in the ferrites depends on the reaction pH and the mol ratio of the heavy metal ions in the reaction solution and to the Fe(II) ions added to the reaction solution. Ferrite Process is now practically adopted to the treatment of the laboratory waste waters at the universities and the institutes in Japan, to the treatment of the plating waste waters, and to the treatment of branching mine drainage waters. Since the ferrite sludge has a strong magnetic property, it is reused as a useful magnetic material.

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