Use of landfill leachate as a carbon source in a sulfidogenic fluidized-bed reactor for the treatment of synthetic acid mine drainage

Şahinkaya, Erkan; Dursun, Nesrin; Özkaya, Bestamin; Kaksonen, Anna H.

doi:10.1016/j.mineng.2012.10.019

Cited by 42 publications

(20 citation statements)

References 21 publications

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“…Cirik et al and Sahinkaya et al [19,20] have studied sulfate removal, including metal precipitation, from synthetic AMD in batch reactors and fluidized bed reactors, respectively. The first work reported pH elevation from 4.0 to 8.0 and 100% of chromium removal by sulfide precipitation.…”

Section: Methodsmentioning

confidence: 99%

“…Compared with the literature, the kinetic constants obtained in this study are higher than those previously reported under similar, but not identical conditions. [19,20] In this case, the cited reports presented operating conditions that did not include either a low initial pH or the addition of metals. In contrast, our results agree with another report from Camiloti et al, [21] in which copper is added under neutral conditions.…”

Section: Kinetic Analysismentioning

confidence: 99%

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The effect of acidic pH and presence of metals as parameters in establishing a sulfidogenic process in anaerobic reactor

Vieira

Couto

Sancinetti

et al. 2016

Journal of Environmental Science and Health, Part A

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The successful use of anaerobic reactors for bioremediation of acid mine drainage has been shown in systems with neutral pH. However, the choice of an efficient and suitable process for such wastewater must consider the capability of operating at acidic pH and in the presence of metals. This work studies the performance of an anaerobic batch reactor, under conditions of varying initial pH for its efficiencies in sulfate removal and metal precipitation from synthetic acid mine drainage. The chemical oxygen demand/sulfate (COD/SO4(2-)) ratio used was 1.00, with ethanol chosen as the only energy and carbon source. The initial pH of the synthetic drainage was progressively set from 7.0 to 4.0 to make it as close as possible to that of real acid mine drainage. Metals were also added starting with iron, zinc, and finally copper. The effectiveness of sulfate and COD removal from the synthetic acid mine drainage increased as the initial pH was reduced. The sulfate removal increased from 38.5 ± 3.7% to 52.2 ± 3%, while the removal of organic matter started at 91.7 ± 2.4% and ended at 99 ± 1%. These results indicate that the sulfate reducing bacteria (SRB) community adapted to lower pH values. The metal removal observed was 88 ± 7% for iron, 98.0 ± 0.5% for zinc and 99 ± 1% for copper. At this stage, an increase in the sulfate removal was observed, which reaches up to 82.2 ± 5.8%. The kinetic parameters for sulfate removal were 0.22 ± 0.04 h(-1) with Fe, 0.26 ± 0.04 h(-1) with Fe and Zn and 0.44 ± 0.04 h(-1) with Fe, Zn, and Cu.

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Section: Methodsmentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

The effect of acidic pH and presence of metals as parameters in establishing a sulfidogenic process in anaerobic reactor

Vieira

Couto

Sancinetti

et al. 2016

Journal of Environmental Science and Health, Part A

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“…The best way to reduce the mobility of heavy metals is to transform them into insoluble compounds such as sulfides, which are more stable forms. It has been reported that certain heavy metals such as Cr (VI) may be reduced under sulfate reducing conditions (Singh et al, 2011;Sahinkaya et al, 2013;Cirik et al, 2013). Sulfate-reducing bacteria (SRB) under anaerobic conditions oxidize simple organic compounds (such as acetic acid and lactic acid) by utilizing sulfate as an electron acceptor and generate hydrogen sulfide.…”

Section: Introductionmentioning

confidence: 99%

Biogenic sulfides for sequestration of Cr (VI), COD and sulfate from synthetic wastewater

et al. 2015

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The aim of this work is to explore the possibility of using mixed culture of mesophilic sulfate-reducing bacteria (SRB) for retrieval of toxic and carcinogenic Cr (VI) from synthetic solution. In order to treat Cr (VI) containing wastewater effectively, SRB culture was adapted to 50 mg/L Cr (VI) and maintained through repeated sub-culturing to enhance the growth and activity of SRB. Batch biosorption experiments were carried out in glass serum vials by cultured SRB, accomplishing the removal of 82.1% Cr (VI), 76.9% sulfate, 85.7% COD under the following optimized conditions: pH 7, hydraulic retention time (HRT) 7 days, temperature 37 • C and initial Cr (VI) concentration of 50 mg/L. Further sorption experiments were conducted on synthetic wastewater under optimal operational conditions and resulted in 89.2% Cr (VI), 81.9% COD and 95.3% sulfate reduction from simulated wastewater. The results of this work contributed to a better understanding of metal uptake by biogenic sulfides and would be beneficial in the development of potential biosorbents that possess high capacities for Cr (VI) uptake from aqueous environments.

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“…Consequently, a better alternative would be to extract the soluble organics from MSW in a liquid stream and feed this through to a sulfate-reducing reactor. Studies have proposed landfill 3 leachate as a source of soluble organic carbon for SRB (Sahinkaya et al, 2013), however the leachate from landfills is typically dominated by refractory organics and low concentrations of available soluble organics, which has resulted in poor sulfate reduction rates in these studies.…”

Section: Thesis Objectivementioning

confidence: 99%

“…Up until now, only Sahinkaya et al (2013) has investigated the effectiveness of landfill leachate as an electron donor for active sulfate reduction. Biological sulfate reduction rates of 0.90 g SO4 2 /L/day were reported for landfill leachate with 2 g COD/L (Sahinkaya et al, 2013), although only 30-40% of the COD was directed to sulfate reduction compared to 70% with ethanol.…”

Section: Sulfate Reduction With Landfill Leachatementioning

confidence: 99%

Using municipal solid waste as a carbon source for biogenic H2S production

Patel¹

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Hydrogen sulfide (H2S) is a precipitant used widely for metal recovery in metallurgical industries. A potentially low-cost method for producing H2S utilizes two waste products: municipal solid waste (MSW) and sulfate-rich wastewater. In this process, MSW serves as the electron donor and sulfaterich wastewater functions as an electron acceptor for sulfate-reducing bacteria (SRB) to produce H2S through the anaerobic respiration of SRB. The free liquid that is generated in a MSW landfill, referred to as leachate, has previously been tested as an electron donor for SRB. However, with high concentrations of recalcitrant organic carbon and biodegradable carbon typically scavenged by fermentative and methanogenic microorganisms, the use of leachate typically results in poor sulfate reduction rates. The liquor from the anaerobic fermentation of MSW (composed primarily of volatile fatty acids (VFAs)) could instead provide a more concentrated and readily available source of electron donors for SRB. Yet, the variability in the composition of organics within the liquor combined with the versatility of SRB and the presence of competitors for substrates results in poor predictions of sulfate reduction rates. Furthermore, the combined use of liquor from MSW fermentation (fermenter liquor) and sulfaterich wastewater would serve as an exemplar for using two locally available waste sources to produce a valuable resource of local demand. However, the high salinity of some sulfate wastewater streams, particularly in arid regions such as Australia, is found to make biological sulfate reduction less effective. Therefore, to explore the combined use of the two waste streams, the aim of this study was to examine the effectiveness of MSW fermenter liquor as an electron donor to be used with high salinity sulfate streams for biological H2S production. Studies have found that a limitation to using VFA mixtures as a feed to SRB cultures is that acetate is often not metabolized. As such, the capacity of different inocula to utilize all the fermentation products of MSW for sulfate reduction was investigated. The three inocula chosen for investigation were biofilm from a laboratory-scale reactor fed with sewage, sediment from a brackish mangrove, and sediment from a saline estuary. The salinities of the environments from which the inocula were sourced were maintained throughout the enrichment. The performance of each inoculum was evaluated for the extent that the chemical oxygen demand (COD) was utilized by SRB. The study found that the mangrove and estuarine inoculated reactors demonstrated higher sulfate removal efficiencies (80-88%) compared to the biofilm inoculated reactors (32-49%) as a result of the efficient use of COD. To explore VFA usage by sulfate-reducing cultures exposed to high salinity sulfate streams, the culture enriched from the estuarine sediment and hence grown under saline conditions of 20 g NaCl/L was subject to salinity increments of 7.5 g NaCl/L from 20 to 50 g NaCl/L. With a feed of ii synthetic fermenter liquor (VFA ...

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Use of landfill leachate as a carbon source in a sulfidogenic fluidized-bed reactor for the treatment of synthetic acid mine drainage

Cited by 42 publications

References 21 publications

The effect of acidic pH and presence of metals as parameters in establishing a sulfidogenic process in anaerobic reactor

The effect of acidic pH and presence of metals as parameters in establishing a sulfidogenic process in anaerobic reactor

Biogenic sulfides for sequestration of Cr (VI), COD and sulfate from synthetic wastewater

Using municipal solid waste as a carbon source for biogenic H2S production

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