Removal of nitrate by modified pine sawdust: Effects of temperature and co-existing anions

Keränen, Anni; Leiviskä, Tiina; Hormi, Osmo; Tanskanen, Juha

doi:10.1016/j.jenvman.2014.09.006

Cited by 66 publications

(35 citation statements)

References 32 publications

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“…The pH of the solution determined the protonated variable charge of the surface of the MSS [20,27], which affected the electrical properties of the adsorbent and thus had a great influence on the adsorption of nitrate. In the acidic medium, the hydration surface of the MSS underwent a protonation reaction, see Equation (4), and the dissolved metal cation was embedded in the surface of the MSS to obtain a positive charge [26,39]. With the increase of the initial pH, the OH − concentration in the solution increased and the deprotonation reaction occurred on the hydrated surface of the MSS to obtain a negative charge, see Equation (5).…”

Section: Effect Of Phmentioning

confidence: 99%

“…In the acidic medium, the hydration surface of the MSS underwent a protonation reaction, see Equation (4), and the dissolved metal cation was embedded in the surface of the MSS to obtain a positive charge [26,39]. With the increase of the initial pH, the OH − concentration in the solution increased and the deprotonation reaction occurred on the hydrated surface of the MSS to obtain a negative charge, see Equation (5).…”

Section: Effect Of Phmentioning

confidence: 99%

“…This is mainly related to the continuous increase of industrial wastewater, chemical fertilizer, domestic sewage and waste manure, surface rainfall and other water pollution sources [1]. The high concentration of nitrate in water can affect human health and produce environmental risks, which may induce human cancer, eutrophication of surface water, and the destruction of biodiversity in the region [2][3][4][5][6][7]. Among the many methods of nitrate removal, adsorption methods have the advantage of simple operation, low energy consumption and a short treatment cycle.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Yang

et al. 2017

Water

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Steel slag, which makes up a gigantic amount of metallurgical industrial solid waste, was in this experiment successfully synthesized an inexpensive adsorbent used to remove nitrate pollution from aqueous solution. This adsorbent was obtained by mixing steel slag, aluminium hydroxide and deionized water, and aging this at a mass ratio of 3:0.45:2, and then activating it at 800 • C. The physicochemical characteristics of the steel slag before and after modification were investigated to compare the effect of their surface properties on the adsorption behaviour of nitrate. The effects of adsorbent dosage, pH, and contact time on the adsorption process were investigated. The results showed that an increase in specific surface area and the formation of a positive surface of the modified steel slag (MSS) compared with the original steel slag (OSS) could effectively increase the number of the active adsorption sites and nitrate removal ability. The optimum parameters for nitrate removal were as follows: the concentration of nitrate was 20 mg/L, the dosage was 1 g/100 mL, the pH was four, and the reaction time was 180 min. The adsorption capacity of the MSS was approximately 1.9 times that of the OSS. The nitrate adsorption of the MSS was in accordance with the pseudo-second-order model and the Freundlich model, which indicated that the adsorption of nitrate on the MSS was mainly single layer chemical adsorption. The mechanism of nitrate removal mainly included ion exchange, hydrogen bonding, electrostatic interactions and intermolecular interactions. In addition, regeneration experiments indicated that the MSS after regeneration still had the capacity to remove nitrate.

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Section: Effect Of Phmentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Yang

et al. 2017

Water

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“…Osim nativne biomase, od značaj-ZASTITA MATERIJALA 58 (2017) broj 4 531 nog interesa za ove svrhe su sorbenti koji se mogu dobiti kroz niz jednostavnih fizičkih i hemijskih modifikacija otpadnih biomasa [13]. Novi alternativni sorbenti različitih anjonskih vrsta na bazi biomase postali su sve više predmet naučnih istraživanja, obzirom da biomase zbog svojih jedinstvenih osobina (adsorptivnost, biokompatibilnost, biodegradabilnost i hidrofilnost) predstavljaju funkcionalni ekološki materijal [14,15]. Ligno-celulozna biomasa kore tikve sudovnjače Lagenaria vulgaris (LV) predstavlja dragoceni agrootpad za ove svrhe.…”

Section: Uvodunclassified

Nitrate sorption by modified Lagenaria vulgaris biomass: Kinetic and equilibrium studies

Marković-Nikolić¹,

Nikolić²

2017

Zas Mat

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“…Nitrate contamination of surface water is a relevant problem due to its negative impact on human health, particularly for methemoglobinemia in infants and also nitrate severs as nutrient for photoautotrophs and spurs eutrophication of water bodies [1]. Sulfate is often found as a co-contaminant with nitrate in a variety of waste streams [2][3][4][5][6][7][8][9][10], as sulfuric acid and sulfate salts are used in many industrial manufacturing processes. Sulfate reduction produces hydrogen sulfide, a corrosive, odorous, and toxic substance [1].…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of simultaneous carbon-nitrogen-sulfur removal from industrial wastewater

Chen

Wang

et al. 2017

Journal of Hazardous Materials

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(Nan-Qi Ren) 2 Highlights:1. Simultaneous C-N-S removal from industrial wastewater was mathematically modeled 2. Interactions between SRB, NRB, SOB, FB and MPA were depicted in the model 3. Kinetic parameters for competitive coefficient between SRB and NRB were best estimated 4. The developed mode was the first simulation tool for complicated C-N-S dynamics 5. The model was versatile and feasible to predict relevant processes (e.g., SR-SO, DSR)ABSTRACT A mathematical model of carbon, nitrogen and sulfur removal (C-N-S) from industrial wastewater was constructed considering the interactions of sulfate-reducing bacteria (SRB), sulfide-oxidizing bacteria (SOB), nitrate-reducing bacteria (NRB), facultative bacteria (FB), and methane producing archaea (MPA). For the kinetic network, the bioconversion of C-N by heterotrophic denitrifiers (NO3 -→NO2 -→N2), and that of C-S by SRB (SO4 2-→S 2-) and SOB (S 2-→S 0 ) was proposed and calibrated based on batch experimental data. The model closely predicted the profiles of nitrate, nitrite, sulfate, sulfide, lactate, acetate, methane and oxygen under both anaerobic and micro-aerobic conditions. The best-fit kinetic parameters had small 95% confidence regions with mean values approximately at the center. The model was further validated using independent data sets generated under different operating conditions. This work was the first successful mathematical modeling of simultaneous C-N-S removal from industrial wastewater and more importantly, the proposed model was proven feasible to simulate other relevant processes, such as sulfate-reducing, sulfide-oxidizing process (SR-SO) and denitrifying sulfide removal (DSR) process. The model developed is expected to enhance our ability to predict the treatment of carbon-nitrogen-sulfur contaminated industrial wastewater.

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Removal of nitrate by modified pine sawdust: Effects of temperature and co-existing anions

Cited by 66 publications

References 32 publications

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Nitrate sorption by modified Lagenaria vulgaris biomass: Kinetic and equilibrium studies

Mathematical modeling of simultaneous carbon-nitrogen-sulfur removal from industrial wastewater

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