Artificial groundwater treatment: biofilm activity and organic carbon removal performance

Långmark, Jonas; Storey, M.V.; Ashbolt, Nicholas J.; Stenström, Thor Axel

doi:10.1016/j.watres.2003.10.021

Cited by 40 publications

(19 citation statements)

References 36 publications

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“…The efficiency of natural water treatment when it passes through sand horizons has been investigated in detail in [99]. Despite the fact that the mechanisms of many phenomena involved in this process to date have remained unclear, some regularities of natural self-purification of water in sand horizons still have been revealed.…”

Section: Pretreatment Of Natural Water By Filtration Through Natural mentioning

confidence: 99%

Drinking Water: Factors Affecting the Quality of Drinking Water

Гончарук

2014

Drinking Water

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The relative critical overview of indicators, which set norms to the drinking water and are used as background for regulatory instruments of the USA, the EU, the WHO, Ukraine and Russia, has been revealed. The analytical review of current problems in drinking water preparation technology at centralized drinking water treatment plants has been delivered. The role of natural organic compounds of natural origin in drinking water quality has been revealed. The application of different technological measures to prepare high quality drinking water has been analysed and explained. The influence of condition of water distribution system on the drinking water quality has been evaluated. It has been cited the examples of modern technological systems of drinking water treatment. A new concept of supply the population with a quality drinking water has been introduced. It is based on representation the need to consume adequate water by a person, which is genetically safe, comprises no man induced alloys, and is characterized by occurrence of such natural substances and microelements that are easiest to digest for a body from water. KeywordsThe quality of drinking water · International regulatory instruments · Centralized drinking water treatment plants · Modern water treatment technologies · Man induced alloys, natural microelements · A new concept of supply the population with a quality drinking water Ecological and Hygienic Classification of Centralized Drinking Water Supply SourcesIn the Ukraine, the goal of creating and adhering to adequate quality and safety standards for drinking water is guaranteed by law. Legal documents such as the Water Code of Ukraine [1] and the Law of Ukraine "On drinking water and drinking water supply" [2] were written to uphold this goal. Codex found in these documents details a range of specific tasks centered around ecological, sanitary, and hygienic contents namely:• A complex development of interrelated regulatory documents (standards and norms) for ensuring an ecological and sanitary-hygienic safety practice in the field of use and protection of water and water resources;

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Section: Pretreatment Of Natural Water By Filtration Through Natural mentioning

confidence: 99%

Drinking Water: Factors Affecting the Quality of Drinking Water

Гончарук

2014

Drinking Water

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“…Other investigators (e.g. Bazin et al 1976;Haridas 1984, 1985;Borden and Bedient 1986;Celia and Kindred 1987;Champagne et al 1999;Långmark et al 2004;Kim et al 2004;Iliuta and Larachi 2005;Mohamed et al 2006;Bauer et al 2008) adopted a third approach which assumes partitioning between free flowing and adsorbed microorganisms Haridas 1984, 1985) but their distribution and interaction play no role in depicting the growth dynamics (Baveye and Valocchi 1989). Monod expressions are typically assumed for most applications of this approach, because knowledge of the microorganism population distribution within the pore space is not required (Odencrantz et al 1990).…”

Section: Introductionmentioning

confidence: 99%

“…The first assumes unconsolidated solid aquifer materials are uniformly covered by a thin biofilm (e.g. Rittmann et al 1980;Bouwer and McCarty 1984;Bouwer and Cobb 1987;Champagne et al 1999;Långmark et al 2004;Kim et al 2004;Iliuta and Larachi 2005;Simpson 2008;Buchanan et al 2008). In a second approach, bacteria are assumed to grow and attenuate contaminants within small discrete colonies (or 'micro-colonies') attached to surfaces of aquifer materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless parameters to summarize the influence of microbial growth and inhibition on the bioremediation of groundwater contaminants

Mohamed

Hatfield

2010

Biodegradation

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Monod expressions are preferred over zero- and first-order decay expressions in modeling contaminants biotransformation in groundwater because they better represent complex conditions. However, the wide-range of values reported for Monod parameters suggests each case-study is unique. Such uniqueness restricts the usefulness of modeling, complicates an interpretation of natural attenuation and limits the utility of a bioattenuation assessment to a small number of similar cases. In this paper, four Monod-based dimensionless parameters are developed that summarize the effects of microbial growth and inhibition on groundwater contaminants. The four parameters represent the normalized effective microbial growth rate (η), the normalized critical contaminant/substrate concentration (S*), the critical contaminant/substrate inhibition factor (N), and the bioremediation efficacy (η*). These parameters enable contaminated site managers to assess natural attenuation or augmented bioremediation at multiple sites and then draw comparisons between disparate remediation activities, sites and target contaminants. Simulations results are presented that reveal the sensitivity of these dimensionless parameters to Monod parameters and varying electron donor/acceptor loads. These simulations also show the efficacy of attenuation (η*) varying over space and time. Results suggest electron donor/acceptor amendments maintained at relative concentrations S* between 0.5 and 1.5 produce the highest remediation efficiencies. Implementation of the developed parameters in a case study proves their usefulness.

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“…Representation of these source/sink terms varies from the simple use of first-order decay coefficients to the use of multi-term Monod (or Michaelis-Menten) expressions, which have been adopted by many researchers (e.g. Bazin et al 1976;Haridas 1984, 1985;and Celia and Kindred 1987;Champagne et al 1999;Långmark et al 2004;Kim et al 2004;Iliuta and Larachi 2005;Mohamed et al 2006, Mohamed et al 2007Bauer et al 2008). The multiple-term Monod expression is commonly used when it is unknown which of the species is rate-limiting (Mohamed and Hatfield 2005;and Bauer et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Modeling in situ benzene bioremediation in the contaminated Liwa aquifer (UAE) using the slow-release oxygen source technique

Mohamed

Saleh²,

Sherif

2010

Environ Earth Sci

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Dissolved benzene was detected in the shallow unconfined Liwa aquifer, UAE, which represents the main freshwater source for the nearby residence Bu Hasa camp area. The main source of this contamination is believed to be the rejected water released from Bu Hasa liquid recovery plant. In this paper, a finite element model (METABIOTRANS) is used to simulate the fate and transport of the dissolved benzene plume in Liwa aquifer. Different remediation scenarios were simulated in which the slow-release oxygen source (SOS) technique is utilized to minimize benzene concentrations at the nearest camp supply wells downstream of the contamination zone. Results of the remediation scenarios show that the highest biodegradation rates occur when the oxygen source is placed near the plume center; where higher benzene concentrations exist. The nearest oxygen release source to the contamination zone caused higher stimulation to bacterial growth than further down-gradient oxygen sources. It also exhibited longer resident time of oxygen in the aquifer; and therefore, yielded higher reductions in benzene concentrations. However, using one central SOS proved to be insufficient as contaminant escaped laterally. Additional four transverse oxygen sources were necessary to capture benzene that laterally spread away from the contamination zone. These lateral SOSs were essential to reduce benzene concentrations at the supply wells that are located at the plume fringes. Finally, it was found that increasing oxygen release from one source did not always improve remediation; and that using several SOSs with lower release rates could be a more practical approach to enhance benzene biodegradation in the aquifer.

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Artificial groundwater treatment: biofilm activity and organic carbon removal performance

Cited by 40 publications

References 36 publications

Drinking Water: Factors Affecting the Quality of Drinking Water

Drinking Water: Factors Affecting the Quality of Drinking Water

Dimensionless parameters to summarize the influence of microbial growth and inhibition on the bioremediation of groundwater contaminants

Modeling in situ benzene bioremediation in the contaminated Liwa aquifer (UAE) using the slow-release oxygen source technique

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