Iron Removal by a Passive System Treating Alkaline Coal Mine Drainage

Hedin, Robert S.

doi:10.1007/s10230-008-0041-9

Cited by 38 publications

(25 citation statements)

References 13 publications

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“…The Fe loading to the Anna and HD systems were only 1-3 g/m 2 /day Fe and the Fe retention was only 3-7 mg/L Fe. Systems designed for Fe removal are typically loaded at 10-30 g/m 2 /day Fe and primary treatment units commonly retain more than 50 mg/L Fe (Hedin 2008).…”

Section: Discussionmentioning

confidence: 99%

Passive Treatment of Acidic Coal Mine Drainage: The Anna S Mine Passive Treatment Complex

Hedin¹,

Weaver²,

Wolfe³

et al. 2010

Mine Water Environ

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The Anna S coal mine complex in Tioga County, PA, produces drainage with a pH of 2.8-3.6 containing 3-36 mg/L Al, 1-36 mg/L Fe, and 6-9 mg/L Mn. In 2003, the Babb Creek Watershed Association installed two systems that passively treat three discharges from the mine complex. Both systems contain four parallel vertical flow ponds followed by aerobic wetlands. The vertical flow ponds contain a total of 35,483 t of limestone and 4,913 m 3 of organic substrate. During the last 6 years, the systems have treated an average of 1,971 L/min of flow to neutral pH with 135-146 mg/L of alkalinity (as CaCO 3 ), with less than 1 mg/L of Al and Fe, and 2-4 mg/L of Mn. The vertical flow ponds have generated alkalinity at rates of 32-53 g/m 2 /day as CaCO 3 . No seasonal variation in treatment effectiveness has been observed, despite relatively harsh winter seasons. The total cost of the passive systems was $2.5 million (US). The 20 year projected unit treatment cost, including periodic replacement of the organic substrate, is $403-618 per t (as CaCO 3 ) of net alkalinity generated.

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Section: Discussionmentioning

confidence: 99%

Passive Treatment of Acidic Coal Mine Drainage: The Anna S Mine Passive Treatment Complex

Hedin¹,

Weaver²,

Wolfe³

et al. 2010

Mine Water Environ

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“…Aluminum could be precipitated as insoluble aluminum hydroxide at increasing pH. Dissolved Fe in AMD can be removed by oxidation as the hydroxide or sulfate reduction as the sulfide (Hedin 2008). Concentration of Fe in SMCs tended to increase as the elapsed time of VFPs went on (Fig.…”

Section: Metal Contents In Substratesmentioning

confidence: 94%

Longevity of organic layers of vertical flow ponds for sulfate reduction in treating mine drainages in South Korea

Cheong

Hur

Yim

et al. 2011

Environ Geochem Health

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This study was carried out to evaluate longevity of available organic materials used for sulfate-reducing bacteria (SRB) activity in vertical flow ponds (VFPs) to treat mine drainage in South Korea. Spent mushroom compost samples (SMC) were tested as substrates in VFPs and analyzed for total organic carbon in VFPs, and were collected to analyze total organic carbon (TOC), T-N, T-P, K, metals and residual cellulose to check the longevity assessment. Chemical analysis revealed that the average contents of Fe, Al and Mn in SMC of VFPs were 19,907, 32,137 and 434 mg/kg, respectively. The contents of Fe and Al in SMC of VFPs were much higher than those of the unused SMC (control), but to the contrary, those of Mn showed a reversed tendency. Average TOC content of the controls was 64.19% but in one of the VFP substrates was as low as 15.92%. This might be resulted from SRB consumed the available organic carbon in SMC as VFPs system aged. Contents of T-N in VFPs tended to decrease as VFPs aged. The residual cellulose ranged from 3.88 to 6.72% (g/g). There existed a negative relationship between residual cellulose contents and ages of VFPs. Assuming that SMC in all VFPs had similar compositions when the VFPs were initially established, trend analysis predicted that the amount of carbon source for SRB might be available for 12-15 years further, depending on VFPs.

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“…In South Korea, sites with large-scale mine drainage flows occur in uneven and narrow terrain. Passive treatment of these contaminated sites has the setback of needing large treatment areas (Hedin 2008). Accordingly, considering the special status of Korea and two different treatment concepts with advantages and disadvantages, a complementary new approach should be developed to minimize maintenance and chemical input and enhance treatment efficiency.…”

Section: Introductionmentioning

confidence: 99%

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Jang¹,

Kwon²

2010

Environ Geochem Health

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A pilot-scale plant consisting of an oxidation basin (OB), a neutralization basin (NB), a reaction basin (RB), and a settling basin (SB) was designed and built to conduct pilot-scale experiments. With this system, the effects of aeration and pH on ferrous oxidation and on precipitation of the oxidized products were studied systemically. The results of pilot-scale tests showed that aeration at 300 L/min was optimum for oxidation of Fe(II) in the OB, and the efficiency of oxidation of Fe(II) increased linearly with increasing retention time. However, Fe(II) was still present in the subsequent basins-NB, RB, and SB. Results from pilot-scale tests in which neutralization was excluded were used to obtain rate constants for heterogeneous and homogeneous oxidation. Oxidation of Fe(II) reached almost 100% when the pH of the mine drainage was increased to more than 7.5, and there was a linear relationship between total rate constant, log (K(total)), and pH. Absorbance changes for samples from the NB under different pH conditions were measured to determine the precipitation properties of suspended solids in the SB. Because ferrous remained in the inflow to the SB, oxidation of Fe(II) was dominant initially, resulting in increased absorbance, and the rate of precipitation was slow. However, the absorbance of the suspension in the SB rapidly dropped when pH was higher than 7.5.

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Iron Removal by a Passive System Treating Alkaline Coal Mine Drainage

Cited by 38 publications

References 13 publications

Passive Treatment of Acidic Coal Mine Drainage: The Anna S Mine Passive Treatment Complex

Passive Treatment of Acidic Coal Mine Drainage: The Anna S Mine Passive Treatment Complex

Longevity of organic layers of vertical flow ponds for sulfate reduction in treating mine drainages in South Korea

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

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