Denitrification of drinking water in a two-stage membrane bioreactor by using immobilized biomass

Ravnjak, Matjaž; Vrtovšek, Janez; Pintar, Albin

doi:10.1016/j.biortech.2012.10.055

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…Methanol has been the most common supplemental electron donor to accomplish denitrification in water quality processes, especially in wastewater treatment (Ravnjak et al 2013, Mohseni‐Bandpi & Elliott 1998). However, its use is of concern because of its toxicity, volatility, and safety issues related to transportation, handling, and storage.…”

Section: Introductionmentioning

confidence: 99%

Carbohydrate‐Based Electron Donor for Biological Nitrate and Perchlorate Removal From Drinking Water

Upadhyaya¹,

Kotlarz²,

Togna

et al. 2015

Journal AWWA

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This study evaluated the feasibility of replacing acetic acid with a commercial carbohydrate‐based electron donor (CBED) for removal of nitrate and perchlorate (ClO4–) from drinking water. Bench‐scale biologically active carbon fixed‐bed and fluidized‐bed reactors (FXBR and FLBR, respectively), with an initial empty bed contact time (EBCT) of 42.8 min, were fed simulated groundwater containing 15 mg/L nitrate as nitrogen and 200 μg/L ClO4–. EBCT in the FLBR after final expansion was 80.5 min. During the first 100 days using acetic acid at 125 mg/L chemical oxygen demand (COD), complete nitrate removal was achieved in both systems, whereas perchlorate in the FXBR and FLBR effluents remained below 3 and 6 μg/L ClO4–, respectively. For comparable removals, influent COD requirement was higher with the CBED. Biomass yields with acetic acid and the CBED were 0.54–0.58 and 0.59–0.74 mg CODbiomass/mg CODsubstrate, respectively. The higher yield with the CBED resulted in more frequent maintenance requirements.

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Section: Introductionmentioning

confidence: 99%

Carbohydrate‐Based Electron Donor for Biological Nitrate and Perchlorate Removal From Drinking Water

Upadhyaya¹,

Kotlarz²,

Togna

et al. 2015

Journal AWWA

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“…According to literature data NO 3 − could be adsorbed on solids as a bidentate or monodentate complex. 38,39 A comparison of the intensity of the main peaks shows that while for PCA-np the monodentate nitrate seems to be the predominant species, for PCT-np both type of complexes are formed in similar proportions.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption on the catalyst surface of the anionic species, such as NO 3 − and NO 2 − is favored in acidic media, especially at pH under the point of zero charge of the catalyst. 43 This tendency was also emphasized by the adsorption tests performed in this work (section 3.2).…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, the choice of the support appeared to be an important aspect. Even that the adsorption of NO 3 − was favored on alumina, it was noted that the titania support conferred to the catalysts an increased activity. This finding was assigned to the type and intensity of the interactions between the active phase components and the support.…”

Section: Discussionmentioning

confidence: 97%

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Supported Pd–Cu Nanoparticles for Water Phase Reduction of Nitrates. Influence of the Support and of the pH Conditions

Papa

Balint

Negrilǎ

et al. 2014

Ind. Eng. Chem. Res.

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Pd−Cu nanoparticles were synthesized by the alkaline polyol method and further supported on alumina or titania. The nanoparticles show a crystalline Pd core and a shell rich in amorphous copper as was put in evidence by complex characterization methods (X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and CO chemisorption). The performances of as-prepared catalysts in the water phase reduction of nitrate were assessed in comparison with catalysts obtained by impregnation. Supported nanoparticle catalysts show a high activity in the reduction of nitrates, better than the impregnated catalysts. The importance of the support choice was discussed. The catalyst based on Pd−Cu nanoparticles supported on titania (PCT-np) is the most active, selective, and stable among those investigated. Also, the influence of pH conditions on the PCT-np catalyst performances was emphasized.

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“…Therefore, recent years have seen research on numerous alternative methods, as cited in a review article on the microbial ecology of denitrification (Lu et al 2014). Use of the membrane bioreactor with immobilized biomass (Ravnjak et al 2013) and the packed bed reactor with biofilm (Rodrigues et al 2014) and in batch tests with mixed microbial culture (Xu et al 2014) were investigated in order to achieve more efficient and economically feasible nitrate removal.…”

Section: Introductionmentioning

confidence: 99%

Use of Ion Exchange Beads as a Bacterial Carrier for Biodenitrification

Foglar

Šiljeg

Babić³

2016

Journal AWWA

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In this research, an exhausted ion exchange resin was used as a carrier of bacterial cells, and the resulting bio‐ion exchange resin beads were applied in batch and continuous‐flow experiments for monitoring nitrate removal. The continuous‐flow experiments investigated the effects of hydraulic retention times (HRTs) of 7–24 h on the course of denitrification; nitrate removal was achieved at HRTs longer than 9 h, with nitrate and organic removal efficiencies higher than 99 and 80%, respectively. Nitrate removal was then monitored continuously for 31 days. To investigate the influence of phosphate salts on denitrification performance, raw Cetina River water was used. The research also examined the effect of methanol addition on denitrification by decreasing the methanol‐to‐nitrogen mass ratio to 2.5:1. The obtained nitrate and organic removal efficiencies of 100 and 93%, respectively, suggest that the application of the resin beads was effective for continuous nitrate removal from surface water.

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Denitrification of drinking water in a two-stage membrane bioreactor by using immobilized biomass

Cited by 17 publications

References 15 publications

Carbohydrate‐Based Electron Donor for Biological Nitrate and Perchlorate Removal From Drinking Water

Carbohydrate‐Based Electron Donor for Biological Nitrate and Perchlorate Removal From Drinking Water

Supported Pd–Cu Nanoparticles for Water Phase Reduction of Nitrates. Influence of the Support and of the pH Conditions

Use of Ion Exchange Beads as a Bacterial Carrier for Biodenitrification

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