Adsorption of ammonia nitrogen on lignite and its influence on coal water slurry preparation

Tu, Yanan; Feng, Ping; Ren, Yangguang; Cao, Zhihua; Wang, Rui; Xu, Zhiqiang

doi:10.1016/j.fuel.2018.10.085

Cited by 112 publications

(33 citation statements)

References 31 publications

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“…Many pretreatment techniques, such as coagulation and ozone (O 3 ) catalytic oxidation, are available. Pretreatment technology is generally selected in accord with the treated object [9]. Common methods for removing suspended matter and oil substances include oil separation/precipitation, air floatation, and coagulation sedimentation methods [10].…”

Section: Introductionmentioning

confidence: 99%

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Chen

Sun

2019

IJERPH

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In this study, coagulation, ozone (O3) catalytic oxidation, and their combined process were used to pretreat actual coking wastewater. The effects on the removal of chemical oxygen demand (COD) and phenol in coking wastewater were investigated. Results showed that the optimum reaction conditions were an O3 mass flow rate of 4.1 mg min−1, a reaction temperature of 35 °C, a catalyst dosage ratio of 5:1, and a O3 dosage of 500 mg·L−1. The phenol removal ratio was 36.8% for the coagulation and sedimentation of coking wastewater under optimal conditions of 25 °C of reaction temperature, 7.5 reaction pH, 150 reaction gradient (G) value, and 500 mg·L−1 coagulant dosage. The removal ratios of COD and phenol reached 24.06% and 2.18%, respectively. After the O3-catalyzed oxidation treatment, the phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds were degraded to varying degrees. Coagulation and O3 catalytic oxidation contributed to the removal of phenol and COD. The optimum reaction conditions for the combined process were as follows: O3 dosage of 500 mg·L−1, O3 mass flow of 4.1 mg·min−1, catalyst dosage ratio of 5:1, and reaction temperature of 35 °C. The removal ratios of phenol and COD reached 47.3% and 30.7%, respectively.

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Section: Introductionmentioning

confidence: 99%

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Chen

Sun

2019

IJERPH

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“…The N-NH 3 adsorption capacity of the freshly prepared and recovered adsorbent was superior to that of some mineral adsorbents of ammonia nitrogen, such as lignite (3,4 mg g À1 ) (Tu et al, 2019), clinoptilolite (8.1 mg g À1 ) (Karadag et al, 2006) and kaolin (4.3 mg g À1 ) (Zhu et al, 2012), however slightly lower than the modified activated sludge (32,7 mg g À1 ) describeb by Yunnen et al (2016).…”

Section: Recovery Of the Adsorbentmentioning

confidence: 66%

“…Acid-modified chrysotile can be employed to adsorb different types of contaminants in wastewater, such as ammonia, which is often present in rivers, water bodies and air (Ribas et al, 2014;Tu et al, 2019). This compound is found in ionized (NH 4 þ ) or non-ionized (NH 3 ) form, depending on the pH level.…”

Section: Introductionmentioning

confidence: 99%

Chrysotile asbestos treated with phosphoric acid as an adsorbent for ammonia nitrogen

Girotto

Campos

2020

Heliyon

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The purpose of this study was to find an alternative application for chrysotile asbestos, given that there is a complete structure of extraction and production of this class of serpentine minerals, but its use is banned for many applications. The idea was to obtain a compound that could immobilize phosphate by triggering a reaction between the magnesium oxide and hydroxide contained in the mineral, without causing phosphate leaching. To this end, chrysotile (Mg 3 SiO 5 (OH) 4 ) was treated with phosphoric acid (H 3 PO 4 ) in a molar ratio of 1:3 in an aqueous medium at 85 C until the solvent evaporated, resulting in two different solid compounds, which were prepared in a similar manner. The first compound (cri/H 3 PO 4 1:3) 1 , was obtained by rinsing and then heat-treating it at 150 C for 6 h, while the second one, (cri/H 3 PO 4 1:3) 2 , was rinsed after the heat treatment. Compound (cri/H 3 PO 4 1:3) 1 underwent partial leaching, while compound (cri/H 3 PO 4 1:3) 2 showed a mass increase of 48%, with the formation of crystalline magnesium pyrophosphate mixed with amorphous SiO 2 . The latter compound adsorbed N-NH 3 at pH 10, following the pseudo-first-order model (activation energy ¼ 8329 AE 1696 J mol À1 ). Equilibrium experiments, which were performed following Hill's sigmoidal type S2 isotherm model, indicated that the adsorption phenomenon was governed by two processes, i.e., complexation up to the inflection point (K H between 10.0 mg L À1 at 40 C and 13.6 mg L À1 at 25 C) followed by adsorption. The q max varied from 18.0 to 19.6 mgN g À1 and the adsorbent was reusable, maintaining its initial adsorbent capacity during its first reuse. This material, which was tested on real effluents, presented a N-NH 3 removal rate similar to that shown by the test solutions. The treatment of chrysotile with H 3 PO 4 conducts it to a composite that adsorbs ammoniacal nitrogen at pH 10 and it is reusable maintaining the adsorption capacity.

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“…The solid concentration of the slurry with a shear rate of 100 s –1 and an apparent viscosity of 1000 mPa·s was defined as the fixed-viscosity solid concentration of lignite CWS. 23 The lignite CWS samples were divided into two groups, and the static stability was evaluated by observation and a Turbiscan LAB stability analyzer within 7 days.…”

Section: Methodsmentioning

confidence: 99%

Effect of Hydrothermal Dehydration on the Slurry Ability of Lignite

Sun

Zheng

2021

ACS Omega

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The high moisture content limits the large-scale utilization of lignite. Hydrothermal dehydration (HTD) has been confirmed as an effective method to improve the quality of lignite for further utilization. In this study, the effects of the changes in the lignite interface properties caused by the HTD modified final temperature on the slurry ability were investigated in the range of 160–200 °C. The results indicated that with the gradual rise of the HTD modified final temperature, the content of the carboxyl groups and phenolic hydroxyl groups on the surface of lignite decreased by 21.95 and 36.34%, respectively. In the meantime, the atomic ratio of oxygen/carbon, the content of equilibrium moisture, and the thickness of the hydrated film were reduced from 0.293, 14.63%, and 34.26 nm to 0.252, 9.43%, and 13.33 nm, respectively. Therefore, these changes of interfacial properties improved the slurry ability of lignite, with higher fixed-viscosity solid concentration, lower yield stress, increased pseudo-plasticity, and gradually decreased static stability of the prepared lignite coal water slurry. hydrothermal dehydration; slurry ability; oxygen-containing functional groups; hydrated film

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Adsorption of ammonia nitrogen on lignite and its influence on coal water slurry preparation

Cited by 112 publications

References 31 publications

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Chrysotile asbestos treated with phosphoric acid as an adsorbent for ammonia nitrogen

Effect of Hydrothermal Dehydration on the Slurry Ability of Lignite

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