Study on the Effectiveness of Sulfate-Reducing Bacteria Combined with Coal Gangue in Repairing Acid Mine Drainage Containing Fe and Mn

Abstract

In view of the characteristics of the high content of SO42−, Fe2+ and Mn2+ in acid mine drainage (AMD) and low pH value, based on adsorption and biological methods, coal gangue was combined with sulfate-reducing bacteria (SRB). On this basis, four dynamic columns, including Column 1 (SRB combined with spontaneous combustion gangue from the Gaode coal mine), Column 2 (SRB combined with spontaneous combustion gangue from Haizhou), Column 3 (SRB combined with gangue from Haizhou), and Column 4 (SRB combined with gangue from Shanxi), were constructed. The efficacy of four columns was compared by the inflow of AMD with different pollution load. Results showed that the repair effect of four columns was: Column 3 > Column 2 > Column 1 > Column 4. In the second stage of the experiment, the repair effect of Column 3 was the best. The average effluent pH value and oxidation reduction potential (ORP) value were 9.09 and –262.83 mV, the highest removal percentages of chemical oxygen demand (COD) and SO42− were 84.41% and 72.73%, and the average removal percentages of Fe2+, Mn2+ were 98.70% and 79.97%, respectively. At the end of the experiment, when deionized water was injected, the fixed effect of AMD in the four columns was stable and no secondary release appeared.

Dynamic experiments of acid mine drainage with Rhodopseudomonas spheroides activated lignite immobilized sulfate-reducing bacteria particles treatment

“…It can be seen from ORP and COD that SRB in column 1 # had almost no activity due to the support of no carbon source. Therefore, the slow increase of pH mainly depended on lignite, indicating that lignite has the ability to regulate pH, which is consistent with the results of Dong 31 . Lignite can release alkalinity to combine with H + in solution to raise pH.…”

Porous alkali‐activated material from hypergolic coal gangue by microwave foaming for methylene blue removal

“…Coal gangue (CG), a residue with lower carbon content than coal discharged during mining, washing, and the processing of coal tunneling, accounts for ∼10%–15% of unprocessed coal harvest 1–3 . Owing to the rapid growth of the coal mining industry, the total amount of CG is rising sharply and gradually becoming one of the most significant industrial solid residues; global CG production was about 0.7–1.5 billion tons in 2020 4 .…”

“…Coal gangue (CG), a residue with lower carbon content than coal discharged during mining, washing, and the processing of coal tunneling, accounts for ∼10%-15% of unprocessed coal harvest. [1][2][3] Owing to the rapid growth of the coal mining industry, the total amount of CG is rising sharply and gradually becoming one of the most significant industrial solid residues; global CG production was about 0.7-1.5 billion tons in 2020. 4 According to the Guizhou Energy Administration, owing to the rapid expansion of coal production capacity, the quality of raw coal in China has decreased, and the ash content has increased since 2016.…”

Biotechnology of Microorganisms from Coal Environments: From Environmental Remediation to Energy Production

“…In a study by Luptakova et al, a mixed SRB culture of Desulfovibrio and Desulfotomaculum effectively removed Cu 2+ from model solutions after 5–6 days using one batch reactor [ 153 ]. Dong et al showed that SRB combined with coal gangue achieved high treatment efficiency in repairing AMD, i.e., it achieved the highest removal percentages of chemical oxygen, SO 4 2− , Fe 2+ , and Mn 2+ [ 154 ]. SRB isolated by Ma et al [ 155 ] from loess polluted by coal AMD exhibited almost 100% immobilization of Fe 2+ , Cd 2+ , and Zn 2+ by hydrogen sulfide precipitation after 18 days.…”