The introduction of nitrogen from coal into the surface watershed nitrogen cycle due to coal mining activity

Li, Qingguang; An, Li; Wu, Pan; Wang, Shilu; Gu, Shangyi; Yuan, Yongqiang; Guo, Chuan

doi:10.1016/j.scitotenv.2023.165822

Cited by 5 publications

(3 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result of coal-mining activities, the nitrogen cycle in the environment has been significantly altered and nitrogen pollution has increased [47,48]. Especially, the change of the occurrence forms of N in char during ammonia-coal co-pyrolysis affects the release of N and the formation of NO x [49].…”

Section: Sub-peaks N-x: Oxidized Nitrogenmentioning

confidence: 99%

The Occurrence and Distribution of Nitrogen in Coal of Different Ranks and Densities

Liu,

Zhang,

Zhao

et al. 2024

Minerals

View full text Add to dashboard Cite

Nitrogen is one of the significant pollutants emitted from coal combustion, and the study of its distribution and occurrence is very important for the efficient and clean utilization of coal resources. Four kinds of coal with different metamorphic ranks from major coal-producing provinces of China were studied. A gravity float-and-sink experiment was applied to obtain coal samples with different densities from Shanxi Province. The microscope optical method, Kjeldahl method, and X-ray photoelectron spectroscopy (XPS) were used to assess the occurrence, form, and distribution of nitrogen in the coal. The results show that the nitrogen content was about 0.47%–1.85%, and the maximum nitrogen content was positively correlated with the rank of coal, but the difference was not obvious. In the low-rank coal, the nitrogen content was mainly related to vitrinite and inertinite, while in the middle–high-rank coal, the nitrogen content was mainly related to inertinite and minerals. Pyrrolic (N-5) and pyridinic (N-6) were the main forms of nitrogen in the low-rank coal. The contents of N-6 and N-5 decreased with increases in the coal density, but the contents of quaternary N-Q1 and quaternary N-Q2 increased. N-Q2 mainly comes from fixed ammonia nitrogen in minerals, and vitrinite and liptinite contain more N-6 and less N-Q1 than inertinite. This research provides valuable evaluation guidance for the efficient utilization of coal.

show abstract

Section: Sub-peaks N-x: Oxidized Nitrogenmentioning

confidence: 99%

The Occurrence and Distribution of Nitrogen in Coal of Different Ranks and Densities

Liu,

Zhang,

Zhao

et al. 2024

Minerals

View full text Add to dashboard Cite

show abstract

“…In general, SC has a low organic carbon content, usually ranging from 35 to 45% (Ussiri et al, 2014). While coal also contains small amounts of N in various compounds such as NH3, organic nitrogen, and inorganic nitrogen, the concentration of N in coal generally varies between 1-2.5% N (Li et al, 2023).…”

Section: Proximate and Chemical Characteristics Of Subbituminous Coalmentioning

confidence: 99%

Equilibrium study for mercury removal using sub-bituminous coal and its application on ex-gold mining soil contaminated with mercury

Maulana,

Harianti,

Prasetyo

et al. 2024

J. Degrade. Min. Land Manage.

View full text Add to dashboard Cite

Optimizing the potential utilization of low-rank coal, such as sub-bituminous coal (SC), can improve and maintain soil quality and productivity through amelioration technology. This potential is especially in controlling heavy metals such as Hg. This study aimed to examine the geochemistry of SC and the adsorption mechanism of Hg with SC through an adsorption isotherm model approach developed for experimental equilibrium. The geochemical of SC has an atomic composition of C (43.60%), O (40.64%), N (11.96%), Si (1.57%), Al (1.06%), Ca (0.92%), Mg (0.14%) and K (0.11%) and oxide composition dominated by SiO2 (57.07%), as well as O-H and N-H functional groups, C-H C-H, C=C-H, C=O, and C=C-H and minerals (quartz, magnetite, mica and muscovite). Characteristics of SC have a proximate composition (16.99% moisture, 97.81% volatile matter, 69.63% ash, and 28.19% fixed carbon) and chemical properties of pH, EC, CEC, OC, and total N (5.23, 1.38 dS m-1, 35.33 cmol(+) kg-1, 9.81% C, and 0.16% N). The adsorption capacity and coefficient of Hg2+ by SC were 304.32 mg g-1 and 78.67 L kg-1 at pH 1.26 and Hg2+ concentration 100 mg L-1 with a removal efficiency of 76.08%. Hg2+ adsorption isotherms occurred in Langmuir (RL = 0.97 and R² = 1)>Freundlich (1/n = 1.05 and R² = 0.9999) models. The application of 40 t SC ha-1 on ex-gold mining soil contaminated with Hg significantly decreased the total Hg in the soil by 2.50 mg kg-1 and a removal efficiency of 36.37% with increased pH H2O (0.35), OC (0.041% C), and CEC 2.14 cmol(+) kg-1, compared to control.

show abstract

“…In general, SC has a low organic carbon content, usually ranging from 35 to 45% [39]. Although coal also contains small amounts of N in various compounds such as NH3, organic nitrogen, and inorganic nitrogen, the N concentration in coal generally varies between 1-2.5% N [40]. The decrease in N after activation by 0.06% is because NaOH can react with nitrogen compounds, especially if there are amine groups (NH2) in the coal, forming ammonia (NH3).…”

Section: ) Proximate and Chemical Characteristics Of Sub-bituminous C...mentioning

confidence: 99%

The Ability of Sub-Bituminous Coal Activated with NaOH in Removal of Mercury: Equilibrium and Isotherm Study

2024

IJESD

View full text Add to dashboard Cite

Improved utilization strategies for Sub-Bituminous Coal (SC) can be made using alkaline materials to increase soil productivity and can also reduce metal concentrations in aqueous solution. This study aims to examine the characteristics of SC activated with NaOH (SC-NaOH) and the mechanism of Hg 2+ adsorption by SC-NaOH through an adsorption isotherm model approach developed for experimental equilibrium. The SC-NaOH was characterized by proximate composition (29.59% moisture; 76.02% volatile matter; 72.02% ash and 4.02% fixed carbon) and chemical properties (pH 12.60; EC >2.00 dS/m; CEC 141.60 cmol(+)/kg; OC 14.38% C and total N 0.10% N). The adsorption of Hg 2+ on SC-NaOH increased with increasing Hg concentration and decreasing pH. The adsorption capacity and coefficient of Hg 2+ by SC-NaOH were 262.51 mg/g and 131.12 l/kg at pH 1.68 and Hg 2+ concentration of 100 mg/l with a removal efficiency of 65.63%. Hg 2+ adsorption isotherms occurred in Freundlich model (1/n = 1.03: cooperative adsorption and R² = 1) = Langmuir model (RL = 0.94: favorable and R² = 1).

show abstract

The introduction of nitrogen from coal into the surface watershed nitrogen cycle due to coal mining activity

Cited by 5 publications

References 69 publications

The Occurrence and Distribution of Nitrogen in Coal of Different Ranks and Densities

The Occurrence and Distribution of Nitrogen in Coal of Different Ranks and Densities

Equilibrium study for mercury removal using sub-bituminous coal and its application on ex-gold mining soil contaminated with mercury

The Ability of Sub-Bituminous Coal Activated with NaOH in Removal of Mercury: Equilibrium and Isotherm Study

Contact Info

Product

Resources

About