Denitrification of simulated nitrate-rich wastewater using sulfamic acid and zinc scrap
-
Jung-Hwa Jang
,
Ankur Gaur
Abstract
An enhanced chemical denitrification process was studied as an alternative treatment of nitrate-rich wastewater which cannot be easily treated using conventional biological methods. To accelerate denitrification and to reduce the conversion to ammonia, nitrite reductants were added. In a batch test with the initial nitrate concentration of 500 mg NO3− -N per L, sulfamic acid and zinc were found to be the best nitrite and metal reductants, respectively. In a column test with the initial nitrate concentration of 500 mg NO3−-N per L, optimum results were experimentally obtained over a zinc scrap column with a 1.0 molar ratio of [NH2SO3H]/[NO3−-N] and the recirculating flow rate of 6 L min−1 at pH 2.5. Approximately 98.8 % of nitrate anions were removed, and the observed reaction rate constant (k) was 0.135 min−1. Zinc consumption was reduced to 46.6 % compared to the procedure without sulfamic acid, and sulfamic acid consumption was reduced to 40 % compared to the results of our previous study. Based on these experimental results, it was concluded that chemical nitrate denitrification using sulfamic acid and zinc scrap is an effective alternative treatment protocol for nitrate-rich wastewater.
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© 2011 Institute of Chemistry, Slovak Academy of Sciences
Articles in the same Issue
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Articles in the same Issue
- Lipid retention of novel pressurized extraction vessels as a function of the number of static and flushing cycles, flush volume, and flow rate
- Determination of curcuminoids in substances and dosage forms by cyclodextrin-mediated capillary electrophoresis with diode array detection
- Interaction of Moringa oleifera seed lectin with humic acid
- Hybrid process scheme for the synthesis of ethyl lactate: conceptual design and analysis
- Zinc catalyst recycling in the preparation of (all-rac)-α-tocopherol from trimethylhydroquinone and isophytol
- Denitrification of simulated nitrate-rich wastewater using sulfamic acid and zinc scrap
- Anaerobic treatment of biodiesel by-products in a pilot scale reactor
- Preparation of magnesium hydroxide from nitrate aqueous solution
- Impact of the type of anodic film formed and deposition time on the characteristics of porous anodic aluminium oxide films containing Ni metal
- Synthesis and crystal and molecular structures of N,N′-methylenedipyridinium tetrachlorozincate(II) and N,N′-methylenedipyridinium tetrachlorocadmate(II)
- Effects of denaturing acid on the self-association behaviour of poly(ethylene glycol)-block-poly(γ-benzyl l-glutamate)-graft-poly(ethylene glycol) copolymer in ethanol
- Properties of poly(γ-benzyl l-glutamate) membrane modified by polyurethane containing carboxyl group
- Theoretical thermo-optical patterns relevant to glass crystallisation
- Morphology dependence of 1,2-diphenylethylenediamine-derived organogelator templates in solvents and their influence in the production of nanostructured silica
- Ferric hydrogensulphate as a recyclable catalyst for the synthesis of fluorescein derivatives
- An alternative synthetic process of p-acetaminobenzenesulfonyl chloride through combined chlorosulfonation by HClSO3 and PCl5
- An efficient and novel one-pot synthesis of 2,4,5-triaryl-1H-imidazoles catalyzed by UO2(NO3)2·6H2O under heterogeneous conditions
- Stereoselective synthesis of the polar part of mycestericins E and G
- A regio- and stereoselective three-component synthesis of 5-(trifluoromethyl)-4,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidine derivatives under solvent-free conditions
- Precautions in using global kinetic and thermodynamic models for characterization of drug release from multivalent supports
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- What causes iron-sulphur bonds in active sites of one-iron superoxide reductase and two-iron superoxide reductase to differ?
- MTD-PLS and docking study for a series of substituted 2-phenylindole derivatives with oestrogenic activity
