Wetland treatment at extremes of pH: A review

Mayes, William M.; Batty, Lesley; Younger, Paul L.; Jarvis, Adam P.; Kõiv, Margit; Vohla, Christina; Mander, Ülo

doi:10.1016/j.scitotenv.2008.06.045

Cited by 127 publications

(82 citation statements)

References 94 publications

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“…The uptake of CO2 causes a shift in the equilibrium concentrations of dissolved CO2, carbonic acid (H2CO3), bicarbonate ion (HCO3 − ) and carbonate ion (CO3 2− ), the equilibrium relationships can be described by Equations (2)- (4) [21,22]. * ↔ + (2)…”

Section: Resultsmentioning

confidence: 99%

Effects of Environmental Factors on the Disinfection Performance of a Wastewater Stabilization Pond Operated in a Temperate Climate

Liu

Hall

Champagne

2015

Water

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Treatment in a wastewater stabilization pond (WSP) relies on natural purification processes, which can be sensitive to both location and climate. This study investigated the effects of three environmental factors, pH, dissolved oxygen (DO) and temperature, on disinfection efficiency in a WSP system consisting of three facultative cells, and operated in a temperate climate region, in Eastern Ontario, Canada. Indicator organism (Escherichia coli (E. coli)) removal in WSP systems is driven by a combination of different factors. Elevated pH and DO concentrations, which are attributed to the presence of algae, are important factors for effective disinfection. Therefore, the presence of algae in natural wastewater treatment systems can contribute appreciably to disinfection. Consequently, based on algal concentrations, removal efficiencies of pathogenic microorganisms during wastewater treatment over the course of a year can be highly variable, where higher removal efficiencies would be expected in summer and fall seasons.

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Section: Resultsmentioning

confidence: 99%

Effects of Environmental Factors on the Disinfection Performance of a Wastewater Stabilization Pond Operated in a Temperate Climate

Liu

Hall

Champagne

2015

Water

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“…In the environment, the three most important processes that buffer AMD are: (i) abiotic dissolution of carbonate materials, which generates alkalinity and consumes protons, (ii) abiotic and microbial reduction of iron oxides and (oxy)hydroxides, and (iii) microbial sulphate reduction [4][5][14][15]. Bioremediation systems harness one or more of these mechanisms, in particular bacterial sulphate reduction, to detoxify AMD.…”

Section: Neutralization Of Amd In Sand Mesocosmsmentioning

confidence: 99%

“…treatment systems, microbial reduction of sulphates to sulphides and the concomitant production of bicarbonate is fundamental to the neutralization of AMD [5][6]13]. The subsequent formation of sulphide-metal precipitates is also an important mechanism for the removal of iron and other metals from AMD in passive treatment systems [6].…”

mentioning

confidence: 99%

“…The degradation of complex materials is performed by microbial consortia, including cellulose-degrading, acetogenic, methanogenic and sulphate reducing bacteria (SRB) [5,12,[16][17][18]. It is therefore difficult to achieve a steady concentration of utilizable, simple substrates for SRB and sulphate reduction may be rate-limited under field conditions, especially when the substrate has high cellulose content [5,[19][20].…”

mentioning

confidence: 99%

“…It is therefore difficult to achieve a steady concentration of utilizable, simple substrates for SRB and sulphate reduction may be rate-limited under field conditions, especially when the substrate has high cellulose content [5,[19][20]. In addition, AMD may be characterized by high concentrations of heavy metals which can negatively impact SRB communities [20].…”

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confidence: 99%

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Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

Welz

Ramond

Cowan

et al. 2014

Biotechnol Bioproc E

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The formation of environmentally toxic acidic waste from mining activities is a world-wide problem. Neutralization of this waste can be accomplished by physicochemical and/or biological means. In this short-term study, synthetic acid mine drainage was added to sandfilled mesocosms containing silica-dominated (quartz) sand. Glucose was added as a carbon source for microbial iron and/or sulphate reduction. Replicates contained two separate batches of sand obtained from the same quarry site. The investigations used to assess and compare the chemical and biological functioning of the replicates included system hydraulic conductivity measurements, sand chemistry, effluent chemistry and bacterial community fingerprinting. Minor differences in composition of the sand, including the levels of available nutrients and micronutrients, resulted in major differences in measured parameters. 2 Significant differences in effluent chemistry were found in systems containing different batches of sand. It was demonstrated that the characteristics of the sand and the presence of acid mine drainage impacted the bacterial community structure and function. The importance of the physical substrate on the selection of functional microbial communities in systems remediating AMD should not be under-estimated. The physical substrate should be carefully selected and it may be prudent to include small-scale comparative studies in each particular setting prior to full-scale implementation.

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A Review on the Use of Constructed Wetlands for the Treatment of Acid Mine Drainage

Sheridan

Akçıl

Kappelmeyer

et al. 2018

Constructed Wetlands for Industrial Wastewater Treatment

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Wetland treatment at extremes of pH: A review

Cited by 127 publications

References 94 publications

Effects of Environmental Factors on the Disinfection Performance of a Wastewater Stabilization Pond Operated in a Temperate Climate

Effects of Environmental Factors on the Disinfection Performance of a Wastewater Stabilization Pond Operated in a Temperate Climate

Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

A Review on the Use of Constructed Wetlands for the Treatment of Acid Mine Drainage

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