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Global sensitivity and uncertainty analysis of the VIP ecosystem model with an expanded soil nitrogen module for winter wheat-summer maize rotation system in the North China Plain

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Pedosphere 2021年第5期31卷 822-838页

作者： Lihong HE Xingguo MO Shi HU Suxia LIU Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101(China) College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049(China) Sino-Danish Center University of Chinese Academy of SciencesBeijing 100049(China)

Accurately simulating the soil nitrogen(N)cycle is crucial for assessing food security and resource utilization *** accuracy of model predictions relies heavily on model *** sensitivity and uncertainty of the simulations of soil N cycle of winter wheat-summer maize rotation system in the North China Plain(NCP)to the parameters were ***,the N module in the Vegetation Interface Processes(VIP)model was expanded to capture the dynamics of soil N cycle calibrated with field measurements in three ecological stations from 2000 to ***,the Morris and Sobol algorithms were adopted to identify the sensitive parameters that impact soil nitrate stock,denitrification rate,and ammonia volatilization ***,the shuffled complex evolution developed at the University of Arizona(SCE-UA)algorithm was used to optimize the selected sensitive parameters to improve prediction *** results showed that the sensitive parameters related to soil nitrate stock included the potential nitrification rate,Michaelis constant,microbial C/N ratio,and slow humus C/N ratio,the sensitive parameters related to denitrification rate were the potential denitrification rate,Michaelis constant,and N2 O production rate,and the sensitive parameters related to ammonia volatilization rate included the coefficient of ammonia volatilization exchange and potential nitrification *** on the optimized parameters,prediction efficiency was notably increased with the highest coefficient of determination being approximately ***,the average relative interval length at the 95% confidence level for soil nitrate stock,denitrification rate,and ammonia volatilization rate were 11.92,0.008,and 4.26,respectively,and the percentages of coverage of the measured values in the 95% confidence interval were 68%,86%,and 92%,*** identifying sensitive parameters related to soil N,the expanded VIP model optimized by the SCE-UA algorithm can effectively si

关键词： ammonia volatilization denitrification rate global sensitivity analyses shuffled complex evolution developed at the University of Arizona(SCE-UA)algorithm vegetation interface processes model

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Removal of AlN from secondary aluminum dross by pyrometallurgical treatment

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Journal of Central South University 2021年第2期28卷 386-397页

作者： WANG Jian-hui ZHONG Ye-qing TONG Yue XU Xun-lin LIN Gao-yong School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Materials Science and Engineering(Ministry of Education) Central South UniversityChangsha 410083China

A new process of AlN removal from secondary aluminum dross(SAD)by pyrometallurgical treatment with added cryolite was applied for solving the problem of recycling the secondary aluminum *** response surface methodology(RSM)was used to design experiments and optimize *** results show that adding the appropriate amount of cryolite can effectively promote the oxidation of AlN in the SAD,and too much cryolite will reduce the promotion *** effects of roasting temperature and cryolite on the denitrification rate are the most significant(pdenitrification rate are found to be in good agreement with experimental values(R^(2)=0.9894 and R_(adj)^(2)=0.9775),which confirms the validity of the model *** optimum conditions of roasting temperature of 750°C,holding time of 194 min,mass fraction of cryolite of 17.7%are obtained according to the quadratic *** these conditions,the maximum actual denitrification rate reaches 94.71%and the AlN content in the SAD is only 0.55 wt%.The unfired brick with compressive strength of 18.62 MPa(GB/T 2542−2012)was prepared based on the roasted SAD.

关键词： secondary aluminum dross(SAD) AlN pyrometallurgy treatment denitrification rate response surface methodology(RSM)

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Experimental study on removal nitrogen oxide of flue gas by using solid absorbents

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Journal of Environmental Science and Engineering 2008年第1期2卷 46-48,66页

作者： YANG Jia-mo GAO Feng LIU Hua-yang School of Environment and Civil Engineering Wuhan Institute of Technology Wuhan 430073 China Wuhuan-Engineering Limited Company Wuhan 430023 China

With the rapid development of modem industry and increase of consumption of the coal, petroleum and natural gas etc., emission of nitrogen oxide （NOx） from flue gas has air environment quality worsen day by day. This research work is experimental study on removal low concentration NOx of flue gas by using solid absorbents. The experiment result shown that denification rate by modified activated carbon is higher than that of modified zeolite and rectorite. Average denitrification rate is 65.47% and maximum denitrification rate is 95.82% for activated carbon; average denitrification rate is respectively as 43.29% and 36.18%, maximum denitrification rate is respectively as 87.51% and 79.47% for modified zeolite and rectorite. Experiment results indicated that NO adsorption process of activated carbon can be described by Freudlich adsorption mode, K=0.143 and n=2.842 and Freudlich adsorption isotherm equation is： q = 0.143MO^0.3519.

关键词： nitrogen oxide denitrification rate adsorption kinetics solid absorbents

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