Article
Environmental Sciences
Siyu Wang, Lingqing Wang, Yizhong Huan, Rui Wang, Tao Liang
Summary: The study demonstrates that PTE pollution in road dust is prevalent across China, with levels generally higher in eastern cities than western cities. The main driving factors are socioeconomic, contributing to ecological and human health risks, particularly in southeastern coastal areas and the Beijing-Tianjin-Hebei region. Regions in western China may have potential noncarcinogenic risk from Cd and Pb, necessitating monitoring and control measures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Food Science & Technology
Guohui Shen, Xin Ru, Yanting Gu, Wei Liu, Kunzhen Wang, Baiyi Li, Yanzhi Guo, Juan Han
Summary: Heavy metal(loid)s pollution in farmland soil is a significant environmental and human health issue. Accurately understanding and evaluating the levels of heavy metal pollution in soil is crucial for sustainable agricultural development and food safety. Mountainous and hilly areas, which serve as both industrial and agricultural regions, are more susceptible to heavy metal pollution in farmland soil.
Article
Multidisciplinary Sciences
Qiang Li, Junyin Yang, Wenhao Guan, Zhigang Liu, Guoxing He, Degang Zhang, Xiaoni Liu
Summary: This study evaluated the overall soil characteristics of grasslands in the Qilian Mountains, finding that most regions had good soil fertility with high levels of organic matter, total nitrogen, and available potassium. Different grassland types had varying main limiting factors affecting soil fertility, such as pH, total nitrogen, and organic matter in lowland meadows, and pH and available phosphorus in upland meadows, alpine meadows, temperate steppes, and alpine steppes. The findings suggest that phosphorus application may be required for typical grasslands and meadows, while both nitrogen and phosphorus are needed for desert grasslands to improve soil fertility and productivity.
Article
Environmental Sciences
Shicheng Xie, Tian Lan, An Xing, Chen Chen, Chang Meng, Shuiping Wang, Mingming Xu, Mei Hong
Summary: This study measured and evaluated the distribution, sources, and ecological risks of heavy metals in soils in a typical lead-zinc mining area in Inner Mongolia, China. The results showed high concentrations of heavy metals, indicating severe pollution in certain areas. The sources and exposure pathways of different heavy metals varied, posing risks to human health.
JOURNAL OF ARID LAND
(2023)
Article
Energy & Fuels
Peng Jiang, Cheng-rui Xie, Chun-lin Luo, Wei Meng, Gang Yang, Guang-suo Yu, Yan Gong, Mengxia Xu, Tao Wu
Summary: The migration and modes of occurrence of heavy metals in the opposed multi-burner coal-water-slurry gasification process were studied. Results showed that fine slags had higher concentrations of heavy metals compared to coarse slags. Chromium was enriched in coarse slags, while lead and zinc were mainly accumulated in fine slags. Majority of heavy metals in coals were associated with residual fractions, while in fine slags, except for zinc, the other heavy metals were mainly distributed in the residual fraction.
Article
Green & Sustainable Science & Technology
Jie Zhang, Kunpeng Liu, Baijun Yan
Summary: A new synergetic and cleaner method was proposed and verified to alleviate the difficulties of extracting vanadium from high-carbon stone coal and solve the associated pollution problems. The experimental results showed that the method effectively increased the gasification ratio and rate of carbon, and a high-grade vanadium concentrate was obtained through magnetic separation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Metallurgy & Metallurgical Engineering
Shuai Yuan, Yong-hong Qin, Yong-peng Jin, Yan-jun LI
Summary: An innovative suspension roasting-leaching technology in the atmosphere has been proposed to improve vanadium extraction from refractory stone coal. The technology achieved a vanadium leaching rate of 47.14% at a roasting temperature of 800 degrees C, a roasting time of 20 min, and a gas flow rate of 400 mL/min, compared to a previous rate of 20%. The surface of the stone coal became rough and irregular during the suspension roasting process, increasing the specific surface area of the particles and destroying the lamellar structure of silicate minerals, resulting in the release of vanadium. Additionally, the vanadium in the stone coal was oxidized to V(V) or V(IV). The results indicate that the improved leaching rate is attributed to the release and transformation of vanadium during suspension roasting.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Engineering, Chemical
Shuai Yuan, Mengyu He, Ruofeng Wang, Yongpeng Jin, Yanjun Li
Summary: An innovative multistage suspension roasting technology is proposed for vanadium leaching from stone coal. The results show that carbon removal of 53.13% is achieved in the first-stage roasting, accompanied by disruption of the vanadium-bearing mica lattice and production of dehydrogenated mica through the release of hydroxyl groups and vanadium. In the second-stage roasting, carbon is almost completely removed, and the mica structure is further destroyed and partially converted to feldspar. Under optimal conditions, the vanadium leaching rate increases from 20% using conventional technology to 51.42% using the presented technology.
Article
Environmental Sciences
Chultem Batbold, Sonomdagva Chonokhuu, Khulan Buuveijargal, Khongor Gankhuyag
Summary: The study on atmospheric settled dust in Ulaanbaatar found various heavy metal elements, with higher concentrations in the southern part of the city. The distribution of heavy metals shows certain patterns in terms of sources and locations.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Elif Gunal, Mesut Budak, Mirac Kilic, Bilal Cemek, Mesut Sirri
Summary: Spatial distribution and potential sources of heavy metals in agricultural lands were assessed using deep learning algorithms in the Yuksekova Plain region of Turkey. Geoaccumulation index, modified contamination factor, and Nemerow pollution index were used to evaluate pollution degree, and spatial autocorrelation was considered. Models developed using artificial neural network and adaptive neuro-fuzzy inference system showed good performance in predicting heavy metal concentrations. The pollution indices were found to be more effective in interpreting pollution risk levels than simple metal concentrations.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Environmental Sciences
Milena Radomirovic, Slavka Stankovic, Milica Mandic, Mihajlo Jovic, Ljiljana Jankovic Mandic, Snezana Dragovic, Antonije Onjia
Summary: The study analyzed the content of technogenic cesium and naturally occurring radionuclides in surface sediment from the Boka Kotorska Bay, and found a correlation between the radionuclides and major elements in the samples. Primordial radioactivity was more pronounced in the inland of the bay, and a strong association between primordial radionuclides and most major elements was discovered. Positive matrix factorization identified sources of technogenic and natural radionuclides, with Si and Ca separated from other elements. The radiological hazard parameters indicated that the gamma radiation risk in the studied area is within acceptable levels.
MARINE POLLUTION BULLETIN
(2021)
Article
Engineering, Environmental
Xiangxiang Xiao, Yujun Tong, Dali Wang, Yongting Gong, Zhimin Zhou, Yuan Liu, Hongjie Huang, Baixin Zhang, Huizhen Li, Jing You
Summary: The present study evaluated the toxicological effects of sediments collected from Guangzhou waterways and analyzed the influence of land-use configuration on sediment toxicity and heavy metal and arsenic pollution. The results showed that toxicity and chemical composition varied spatially and were related to different land use types. Agricultural and aquacultural activities were found to have the greatest influence on sediment toxicity, while urban land areas were the main source of metal and arsenic pollution. These findings provide essential knowledge for reducing chemical pollution and ecotoxicological risk in sediments.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Mining & Mineral Processing
Hui Li, Yuexin Han, Jianping Jin, Peng Gao, Zhenya Zhou
Summary: The purpose of this study is to use process mineralogy as a practical tool to investigate the causes of low leaching rates in the curing-leaching process of vanadium-bearing stone coal and propose solutions or improvements to optimize the leaching index. By analyzing the effects of particle size, mineral composition, and sulfuric acid curing on different stages of the curing-leaching process, it was found that thorough washing after sieving and optimizing the curing process are necessary for improving the leaching rate. The analysis and detection of key products are helpful for identifying problems and enhancing the curing-leaching circuit process.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yingbo Dong, Shijia Chong, Hai Lin
Summary: The recovery of vanadium from stone coal using bioleaching is a promising method. This study investigated the adsorption characteristics of Bacillus mucilaginosus on vanadium-bearing stone coal through bioleaching and biosorption experiments. The results showed that the pH value, bacterial concentration, and bacterial growth phase affected the biosorption of B. mucilaginosus on stone coal. The adsorption behavior was well described by the Freundlich model and the pseudo-second-order kinetic model.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Geochemistry & Geophysics
A. Ali Yari, J. Varvani, R. Zare
Summary: The study evaluated and zoned the environmental hazards of heavy metals in vineyards of Malayer city using the Nemerow integrated pollution index. The results showed that the soils are not at serious risk of soil contamination with heavy metals.