Using natural biomass microorganisms for drinking water denitrification

Costa, Darleila Damasceno; Gomes, Anderson Albino; Fernandes, Mylena; Bortoluzzi, Roseli Lopes da Costa; Magalhães, Maria de Lourdes Borba; Skoronski, Éverton

doi:10.1016/j.jenvman.2018.03.120

Cited by 44 publications

(10 citation statements)

References 30 publications

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“…It was shown that pH7, 8, and 9 were optimum for denitrification processes by Pseudomonas aeruginosa on glucose media. pH level [18][19][20] . Bacterial biomass may play an important factor in speeding the denitrification process.…”

Section: Discussionmentioning

confidence: 99%

Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal

Alyamani¹,

Booq²,

Bahkali³

et al. 2020

J Pure Appl Microbiol

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Denitrification based on immobilized microbial cellulose may offer an economical replacement for conventional treatment for nitrate removal. The environmental and bacterial biomass may influence the rate of biological denitrification processes. This study aimed to investigate the factors that affect denitrification rates, including carbon sources, pH, and bacterial inoculum. Different inoculum biomass of Pseudomonas aeruginosa and various carbon sources of glucose, sucrose, and cellulose with different concentrations were tested to assimilate 100 mg/L of KNO3 as nitrate source. Additionally, five additional inoculations, five different incubation time, and seven different pH levels were studied. The Pseudomonas aeruginosa isolates used different mineral media with three carbon sources, glucose, sucrose, and cellulose, with different concentrations at different rates to denitrify nitrate. The highest denitrification rate was with glucose after 18 hrs and was after 24 hrs when sucrose and cellulose were used, respectively. The bacterial biomass denitrification level was the highest, between 0.8% and 1% of OD600=1. Nitrate removal by Pseudomonas aeruginosa was the highest at pH 7, 8, and 9. This report suggests that when glucose is used as a carbon source, at neutral to alkaline pH, and 1% of denitrifying bacterial biomass, the highest level of biological denitrification process may be achieved.

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Section: Discussionmentioning

confidence: 99%

Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal

Alyamani¹,

Booq²,

Bahkali³

et al. 2020

J Pure Appl Microbiol

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“…People are using various conventional decontamination technologies worldwide to protect themselves from the adverse effects of the elevated nitrate intake. Among the different nitrate removal methods available, the most frequently used are reverse osmosis, ion exchange, membrane technology, adsorption and biological treatments (Costa et al 2018;Madhav et al 2018).…”

Section: Sources Of Ions In Groundwatermentioning

confidence: 99%

Assessment of groundwater quality with special emphasis on nitrate contamination in parts of Varanasi City, Uttar Pradesh, India

et al. 2018

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In the current study, an effort was made to assess the geochemistry of groundwater by random collection of the samples from 15 different borewells located in various parts of Varanasi City, Uttar Pradesh, India. Geology of the study region is dominated by Quaternary alluvial sediments of Pleistocene to recent times where the younger alluvium receives fresh deposits of silt, clay and loam from periodic flood events. Ca-Mg-HCO 3 was inferred as major hydrogeochemical facies from Piper trilinear diagram. Ca-Mg type and HCO 3 − type were the dominating cation and anion facies, respectively. Hydrogeochemistry reveals that the cation abundance follows the order Na + > Mg 2+ > Ca 2+ > K + and anion abundance HCO 3 − > Cl − > NO 3 − > SO 4 2− > F −. As per Gibb's plot, chemical weathering of rock minerals is affecting the quality of groundwater. Overall, most of the samples for majority of parameters lie within the allowable limits as set by WHO (guideline for drinking water quality, fourth edn, WHO, Geneva, p 340, 2004) except nitrate, which varied in the range of 40.32-78.97 mg/l. 80% of the groundwater samples in which nitrate exceeded beyond acceptable limit (50 mg/l), as per WHO standard, which may be due to poor sewerage, human excreta leakage from septic tanks, poorly maintained disposal of solid waste locally, agricultural activities, wastewater irrigation and irrigation runoff. The Water quality index (WQI) value of the study region depicts that 93% samples lie in the category of excellent water and 7% in good water category. Good positive correlation of NO 3-Cl (r = 0.60) and Na-NO 3 (r = 0.55) signifies an anthropogenic input of these ions into the subsurface water of the study region. The various indices such as electrical conductivity (EC), salinity, percent sodium, sodium absorption ratio (SAR), residual sodium carbonate (RSC), permeability index (PI), Kelly's ratio and magnesium ratio are used to check the fitness of ground water for irrigation uses which shows that groundwater samples of the study region is good to permissible for agricultural uses.

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“…Thus, it is possible to treat waters with the addition of pure organic C compounds such as glucose, methanol, or acetate, or to test different mixing ratios of organic carbon (C org ) such as glycerol and ethanol for their denitrification potential [3,10,11]. Furthermore, enhanced denitrification is also possible with more complex solids such as bamboo biomass, sawdust, or pine bark [12][13][14]. However, since liquid C can be more easily injected into the aquifer, the denitrification potential of wine production wastes and whey has already been investigated [15,16].…”

Section: Introductionmentioning

confidence: 99%

Trace Element Mobility during Corg-Enhanced Denitrification in Two Different Aquifers

Ortmeyer

Wohnlich

Banning

2021

Water

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Nitrate (NO3−)-polluted groundwater treatment by enhanced denitrification is becoming increasingly important due to rising NO3− concentrations and decreasing degradation capacities in aquifers. Besides evaluating the efficacy of substrates added to trigger denitrification, secondary reactions must be closely monitored. Biodenitrification by applied organic carbon (Corg) can lead to considerable changes in redox potential (Eh) and pH, two decisive parameters for trace element mobility. In this study, two geologically and hydrogeochemically different groundwater catchments important for drinking water production were investigated and compared. Sediments were analyzed for trace elements as well as sulfur (S) and carbon (C) contents. Ongoing hydrogeochemical reactions were evaluated with depth-specific isotope characterization, and the potential for trace element mobilization by Corg addition was determined in column experiments. Results for enhanced denitrification showed up to 3.8 times lower reaction rates with respect to comparable studies, probably due to incomplete formation of the necessary denitrifying bacteria. Concentrations of trace elements such as nickel (Ni) must also be considered when evaluating enhanced denitrification, as these can negatively affect microorganisms. Added ethanol led to Ni concentrations dropping from 0.013 mg/L to below the detection limit. Thus, Corg addition may not only induce denitrification, but also lead to the immobilization of previously released trace elements.

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Using natural biomass microorganisms for drinking water denitrification

Cited by 44 publications

References 30 publications

Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal

Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal

Assessment of groundwater quality with special emphasis on nitrate contamination in parts of Varanasi City, Uttar Pradesh, India

Trace Element Mobility during Corg-Enhanced Denitrification in Two Different Aquifers

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