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PHYSICOCHEMICAL METHODS OF NITRATES REMOVAL FROM WASTEWATER

Maciej ŻOŁNIERCZYK

Maciej ŻOŁNIERCZYK

The Silesian University of Technology, Faculty of Energy and Environmental Engineering, Institute of Water and Wastewater EngineeringGliwice, Poland
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ŻOŁNIERCZYK, Maciej
 et 
Krzysztof BARBUSIŃSKI

Krzysztof BARBUSIŃSKI

The Silesian University of Technology, Faculty of Energy and Environmental Engineering, Institute of Water and Wastewater EngineeringGliwice, Poland
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BARBUSIŃSKI, Krzysztof
  
18 oct. 2019
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Catégorie d'article: research-article
Publié en ligne: 18 oct. 2019
Pages: 153 - 159
Reçu: 17 juil. 2019
Accepté: 18 août 2019
DOI: https://doi.org/10.21307/acee-2019-046
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© 2019 Maciej ŻOŁNIERCZYK et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

The effectiveness of chemical reduction of nitrate using nanoscale iron powder with different initial nitrate concentrations and the metal to solution ratio 4 g Fe0/dm3, [14]:
The effectiveness of chemical reduction of nitrate using nanoscale iron powder with different initial nitrate concentrations and the metal to solution ratio 4 g Fe0/dm3, [14]:

Figure 2.

Effects of pH on nitrate removal with iron powder (160–200 mesh). Test conditions: 20 g Fe0/dm3 and 50 mg/dm3 NO3-N solutions, [5]
Effects of pH on nitrate removal with iron powder (160–200 mesh). Test conditions: 20 g Fe0/dm3 and 50 mg/dm3 NO3-N solutions, [5]

Figure 3.

Concentration of nitrate with iron powder (160–200 mesh). Metal to solution ratio 4 g Fe0/dm3. Initial pH 2, [5]
Concentration of nitrate with iron powder (160–200 mesh). Metal to solution ratio 4 g Fe0/dm3. Initial pH 2, [5]

Reducing agents for nitrate chemical reduction, [5]

Reducing agent E°, V pH Nitrogen conversion products Other by-products Process indicators
Al (metal) -2.30 Alkaline NH2, NO2- , N2 Al.(OH)3 -
Fe (metal) -0.037 Acidic NO2- Fe3+ -
-0.771 Alkaline N2 Fe2O3, OH- -
Zn (metal) -1.245 Alkaline NH3, NO2-, N2 Zn(OH)2 Catalysator
NH4+ +0.27 Acidic N2O, N2 - High pressure and temperature, Cl- ions
HCO2H -0.199 Acidic N2O, N2, NH3 CO2 Rh/C
  Acidic N2 CO2, H2 High pressure and temperature
CH3OH +0.017 Acidic NH4+ HCO3- High pressure and temperature
NH3OH+ -0.05 Acidic N2O - -
NH2OH -1.05 Alkaline N2O OH- Cu2+
Fe2+ +0.771 Acidic NO, N2O, N2 Fe3+ -
-0.56 Alkaline NH3 Fe(OH)3, OH- Cu2+, Ag+

Effectiveness of electrochemical reduction in the presence of NaCl solution, [12]

no. Type of anode NaCl concentration in solution [g/dm3] Initial nitrate-N concentration [g/dm3] Final nitrate-N concentration [mg/dm3] Reaction by-products Effectiveness
1 Ti/Pt 0.75 100 24.6 ammonia 75.4%
2 1.00 100 23.8 - 76.2%
3 Ti/IrO2 0.50 100 17.3 ammonia 82.7%
4 0.75 100 22.6 - 77.4%
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