A Study of Zinc Metal Toxicity on the Cellulolytic Bacteria in Anaerobic Passive Treatment Systems

Ruhs, Alison; Excoffon, J.; Figueroa, Linda; Wildeman, Thomas R.

doi:10.21000/jasmr05010985

Cited by 1 publication

(2 citation statements)

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“…These biocolumns only used corn stover and walnut shells as the reactive medium. Start up times for the NTA columns were comparable to times observed for biocolumns using manure as an inoculum (Logan et al 2005 andFigueroa et. al 2005).…”

Section: Biocolumnssupporting

confidence: 65%

“…The other main type of limestone systems are systems that are open to the atmosphere or for waters with large amounts of oxidized metal species, and are thus called oxic limestone systems (OLS) (Ziemkiewicz, et al, 1997, Ziemkiewicz, at al., 1994, Cravotta and Trahan, 1999. In this type of system the pH and alkalinity additions happen concurrently with metal precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a Two-Stage Passive Treatment Approach for Mining Influenced Waters

Figueroa

Miller

Zaluski

et al. 2007

JASMR

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A two-stage passive treatment approach was assessed at a bench-scale level using two Colorado Mining Influenced Waters (MIWs). The first-stage was a limestone drain with the purpose of removing iron and aluminum and mitigating the potential effects of mineral acidity. The second stage was a sulfate reducing bioreactor composed solely of 50% corn stover and 50% walnut shells by volume. The primary difference in the two MIWs was the concentration of zinc 5-7 mg/L for the National Tunnel Adit drainage (NTA) vs. 65-75 mg/L for the Silver Cycle Adit drainage (SCA). The limestone pretreatment columns reduced the zinc in the NTA MIW to 1-2 mg/L and the SCA MIW to 38 -56 mg/L. The two SCA biocolumns had similar zinc removal but different sulfate removal with time. The sulfate reduction rate (SRR) for the SCA columns peaked at day 50 but at 0.5 mol S/m 3 /d for column 1 and 0.3 mol S/m 3 /d for column 2. Average SRR after day 50 was 0.24 and 0.13 mol S/m 3 /d for columns 1 and 2, respectively. The NTA columns (3 and 4) sustained an averaged SRR of 0.3 mol S/m 3 /d for days 30-130. The effluent zinc after startup from the two systems were < 0.1 mg/L and <2 mg/L for the NTA and SCA treatment systems, respectively. Other significant results included startup of sulfate reduction in both sets of bioreactors without the typical "manure" inoculum. The time to start up was not negatively affected by the lack of a designated inoculum. Another important result was the longer start up time required and the overall lower sulfate reduction observed for the higher zinc MIW. Additional

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Section: Biocolumnssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%