In Situ Batch Denitrification of Nitrate-Rich Groundwater Using Sawdust as a Carbon Source—Marydale, South Africa

Israel, Sumaya; Engelbrecht, P; Tredoux, G.; Fey, M. V.

doi:10.1007/s11270-009-0036-6

Cited by 19 publications

(7 citation statements)

References 12 publications

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“…When DOC became depleted after 1.5-2 days in both microcosms (Fig. 3), NO 2 − accumulated and remained high, most likely induced by substrate limitation (Israel et al 2009). …”

Section: Transient Nitrite Accumulationmentioning

confidence: 90%

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

Mastrocicco

Colombani

Salemi

et al. 2011

Water Air Soil Pollut

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Nitrogen fertilizers used in agriculture often cause nitrate leaching towards shallow groundwater, especially in lowland areas where the flat topography minimize the surface run off. In order to introduce good agricultural practices that reduce the amount of nitrate entering the groundwater system, it is important to quantify the kinetic control on nitrate attenuation capacity. With this aim, a series of anaerobic batch experiments, consisting of loamy soils and nitrate-contaminated groundwater, were carried out using acetate and natural dissolved organic matter as electron donors. Acetate was chosen because it is the main intermediate species in many biodegradation pathways of organic compounds, and it is a suitable carbon source for denitrification. Sorption of acetate was also determined, fitting a Langmuir isotherm in both natural and artificially depleted organic matter soils. Experiments were performed in quadruplicate to account for the spatial variability of soil parameters. The geochemical code PHREEQC (version 2) was used to simulate kinetic denitrification using Monod equation, equilibrium Langmuir sorption of acetate, and equilibrium reactions of gas and mineral phases (calcite). The reactive modeling results highlighted a rapid acetate and nitrate mineralization rate, suggesting that the main pathway of nitrate attenuation is through denitrification while calcite acted as a buffer for pH. However, in the absence of acetate, the natural content of organic matter did not allow to complete the denitrification process leading to nitrite accumulation. Reactive modeling is thought to be an efficient and robust tool to quantify the complex biogeochemical reactions which can take place in underground environments.

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“…When DOC became depleted after 1.5-2 days in both microcosms (Fig. 3), NO 2 − accumulated and remained high, most likely induced by substrate limitation (Israel et al 2009). …”

Section: Transient Nitrite Accumulationmentioning

confidence: 90%

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

Mastrocicco

Colombani

Salemi

et al. 2011

Water Air Soil Pollut

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“…[2] The use of carbon dioxide regeneration from Treatment of groundwater with high nitrate content by sub-exchange resin(CARIX) process, Process treatment of groundwater with high nitrate content, NO-3 -Naverage removal of 1/3 to meet drinking water standards, while the process reduces the total hardness by about half. [3] The conventional anion exchange resin method of the regeneration agent is studied and improved, retreatment of alkaline anion exchange resins after conventional treatment with heavy carbonate resin, Then used for swapping and selecting (0.4% MgO + CO2) for Regenerative agent, Greatly improves the regeneration efficiency's, the NO-3 The concentration of from 20 mg/L to 7 .29 mg/L, the average removal rate is 63.6.% The physical method does not actually remove the nitrate completely, Just the transfer or concentration of nitrate contaminants.…”

Section: Physical Methods Of Nitrate Removalmentioning

confidence: 99%

An Overview on the Remediation Technology for the Nitrogen Polluted Groundwater

Han¹,

Salah²,

Shang³

et al. 2019

dteees

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Based on the analysis of the groundwater nitrogen contamination recourse and hazards as well as the urgency requirement of groundwater contamination remediation scientifically and in due time, this paper the sources and hazards of the nitrogen (nitrate, nitrite and ammonia)in the drinking water and groundwater were investigated firstly. Then, a detailed overview of different nitrogen contaminated groundwater remediation Technologies (physical, chemical and biologic) were expounded amply and their advantages and disadvantages were analyzed and compared respectively and the development trend is discussed briefly. At last, the biological remediation technology was identified as the optimal one and the application idea was put forward. 1

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“…Cellulose is organized in fibers imbedded in lignin and hemicelluloses, an association which confers resistance to enzymatic degradation [9]. Cellulose-rich carbon sources, including cotton [13,14], newspaper [15], wheat straw [16,17], sawdust [18][19][20][21][22][23][24], straw [25], rice husk [26] and corncob [27][28][29], employed as substrates for denitrification have been studied in laboratory experiments.…”

Section: Alternative Carbon Sourcesmentioning

confidence: 99%

Advances of External Carbon Source in Denitrification

Liu

Zhang

et al. 2012

AMR

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Carbon source used as electron donors is critical to heterotrophic denitrification. Addition of external carbon source is necessary when internal organics are deficient. A review was conducted on the use of external carbon source in denitrification. Traditional carbon sources such as methanol and ethanol, alternative carbon sources such as cellulose-rich materials, biodegradable polymers and primary sludge are included in external carbon sources. Present situation and problems of its biodegradability and effects in denitrification are summarized. Focus in external carbon source includes further study on the biodegradation mechanism of the media, slow release performance and nitrate removal rate of available carbon source and continuous research on new kinds of substrates. Recommendations on further study of carbon source are put forward.

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In Situ Batch Denitrification of Nitrate-Rich Groundwater Using Sawdust as a Carbon Source—Marydale, South Africa

Abstract: Batch experiments were performed to denitrify groundwater using sawdust as a carbon source at Marydale, South Africa. Alkalinity, pH, electrical conductivity, nitrate, nitrite, ammonia, SO 4 2−

Cited by 19 publications

References 12 publications

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

Reactive Modeling of Denitrification in Soils with Natural and Depleted Organic Matter

An Overview on the Remediation Technology for the Nitrogen Polluted Groundwater

Advances of External Carbon Source in Denitrification

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