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Zhang, Lei
- Mercury Contamination from Historic Gold Mining to Water Bodies and Soils in Zhaoyuan, Shandong, Eastern China
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Authors
Affiliations
1 Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao, 266109, CN
2 Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, CN
1 Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao, 266109, CN
2 Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 2 (2016), Pagination: 559-564Abstract
To clarify the pollution status of mercury (Hg) in water bodies and soils from an old gold mining in China, we collected and analysed water samples in April 2010. The concentration of total Hg (THg) in water ranges from 0.032 to 0.225 μg/L, with average concentration as 0.078 μg/L. Among Hg species, particulate Hg (PHg) ranges from 0.021 to 0.106 μg/L, and the percentage of PHg exceeded 50 percent in most samples. Hg concentration in water is considerably lower than polluted areas by gold mining with amalgamation and Hg mining, close to the concentrations in high Hg background areas in China, but obviously higher than natural waters. THg in sediments ranges from 0.456 to 5.712 mg/kg, with a positive correlation to Hg of waters. THg of sediments in rivers shows a higher concentration than that in reservoirs. Soil Hg concentration ranges from 0.094 to 4.04 mg/kg, with geometric mean 0.36 mg/kg. Fifty percent of soil samples exceed Chinese Soil Reference (Grade II). The calculation results of the geoaccumulation index present a higher accumulation status of Hg in soils in this area. Furthermore, a strong ecological risk is found due to Hg accumulation in soils, according to the classification of assessment index of potential ecological risk levels. Results indicate that Zhaoyuan shows a certain degree of mercury pollution due to gold mining activities.Keywords
Mercury Contamination, Gold Mining, Sediment, Waterbodies.Full Text
References
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- Collaborative Optimization of Emergency Rescue Under Sudden Inter-City Natural Disaster
Abstract Views :113 |
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Authors
Lei Zhang
1,
Yan-yan Kong
1
Affiliations
1 College of Economics & Management, Guangxi Teachers Education University, Nanning, 530001, CN
1 College of Economics & Management, Guangxi Teachers Education University, Nanning, 530001, CN
Source
Nature Environment and Pollution Technology, Vol 13, No 1 (2014), Pagination: 197-202Abstract
This paper combines the characteristics of sudden inter-city natural disaster, and finds out the emergency rescue principles based on the theory of collaborative. Disaster situation and distribution of rescue resources, the rescue efficiency, the rescue reliability, the rescue time and other factors are considered comprehensively, and then a multi-objective assignment model is constructed. Attribute value matrices are transformed into fuzzy relationship matrices according to the theory of fuzzy mathematics and the reserve point method is applied according to the characteristic of the optimization model. With purpose of showing the validity and feasibility of the algorithm Hungarian method is adopted to prove it. The results of the numerical example illustrate that the proposed multi-objective plan does well in task allocation and can satisfy the inter-city emergency rescue task.Keywords
Natural Disaster, Emergency Rescue, Collaborative Optimization, Reserve Point Method.Full Text
- Study on the Application of CuO/Al2O3 Cordierite Ceramic Honeycomb Catalyst in Cleaning the Flue Gas for NOX
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Authors
Affiliations
1 School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, CN
2 China Heavy Machinery Research Institute Co. Ltd., Xi’an 710032, CN
3 School of Environmental Science and Engineering, Chang’an University, Xi’an, 710054, CN
1 School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, CN
2 China Heavy Machinery Research Institute Co. Ltd., Xi’an 710032, CN
3 School of Environmental Science and Engineering, Chang’an University, Xi’an, 710054, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 3 (2016), Pagination: 1071-1075Abstract
This paper introduces the current research status of denitration catalysts used in Selective Catalytic Reduction (SCR) technology, and assess the effects of a composite catalyst on the denitration performance of flue gas. Laboratory experiments were conducted to prepare a new composite catalyst, that is, CuO loaded on a honeycomb cordierite ceramic catalyst carrier with Al2O3 coating by the equivalent volume impregnation method. The orthogonal designed tests were used to study the effects on denitration performance caused by the changes of Al2O3 loading, calcination temperature and calcination time, obtain the optimum condition for the catalyst carrier preparation with the best denitration rate. Then the effects of CuO loading, calcination temperature and calcination time on denitration rate of the new composite catalyst were investigated. Results showed that: (1) As for catalyst carrier, significance of three factors that had effects on the flue gas denitration rate was in a sequence: loading of Al2O3 > calcination temperature > calcination time. (2) Calcined at 600°C for 4 hours with 3% of Al2O3 loading was the condition to prepare the composite carrier with the best denitration rate. (3) For the new composite catalyst, three noticeable increased-then-decreased trends of denitration rate change were presented with the increasing CuO loading, calcination temperature and calcination time. (4) Calcined at 450°C for 4 hours with 8% CuO loading was the condition to prepare the new composite catalyst with the best denitration rate.Keywords
Selective Catalytic Reduction, Denitration, Nitric Oxide, Honeycomb Cordierite Ceramic.Full Text
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- The Mechanism of Denitrification by Plasma with Different Background Gases in Clearing of the Flue Gas for NOX
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Authors
Affiliations
1 School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, CN
2 China Heavy Machinery Research Institute Co. Ltd., Xi’an, 710032, CN
1 School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, CN
2 China Heavy Machinery Research Institute Co. Ltd., Xi’an, 710032, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 4 (2017), Pagination: 1321-1325Abstract
The denitrification rate of NO by using dielectric barrier discharge plasma method with four different background gases, such as N2/NO/O2, N2/NO/O2/NH3, N2/NO/O2/NH3/SO2 and N2/NO was studied. The results showed that the denitrification rate of four kinds of background gas increases with the increase of power and the increase of the 20W~40W range was obvious. The NO was dislodged by active species N which was electrolysed from N2 in the N2/NO system. The greater the initial concentration of NO, the lower the initial denitrification rate. But the stable NO removal rate reached almost 100%. The greater the concentration of O2, the lower removal rate of NO and show that the removal of NO was blocked by O2 in the N2/NO/O2 system. Compared to the N2/NO system, the denitrification rate was decreased when added O2 in the system. The higher the concentration of NH3, the higher denitrification rate in the N2/NO/O2/NH3 system. And the NO was removed by NH and NH2 that was electrolysed from NH3. The removal rate was significantly improved compared with the N2/NO/O2 system. The competitive existence between SO2 and NO in the electrolysis reaction, resulted the denitrification rate decrease in the N2/NO/O2/NH3/SO2 system. And the greater the concentration of SO2, the lower the denitrification rate of NO.Keywords
Plasma, Dielectric Barrier, Denitration, Background Gases.Full Text