作者机构：
[Deng, Yumei; Deng, Jie; Zhang, Chun] Hunan City Univ, Sch Municipal & Mapping Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Chun Zhang] S;School of Municipal and Mapping Engineering, Hunan City University, Yiyang 413000, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
sponge city;waterlogging;water environment;sustainable development
摘要：
Urban waterlogging and urban water environment problems in Changde city caused by extreme weather have seriously hindered the sustainable development of cities. A sponge city not only involves the inheritance and development of foreign technology but also a new method for its use. The background of sponge city construction based on green infrastructures in China was introduced in this study. As one of the first pilot construction cities based on the sponge concept, Changde city possesses natural geographical advantages. The current urban situation, rainfall type and water environment in the sponge construction area were analyzed and the causes of urban waterlogging and deterioration of urban inland river water quality are presented. Based on the urban water environment and ecological status, the specific strategic objectives of the sponge city transformation are given. Meanwhile, the overall technical route and the concrete realization path of each index, such as the water environmental system, water ecological system and security system, are also presented. The annual net flow total control rate and the runoff pollution reduction reached 77.56% and 45.18%, respectively. The total runoff and peak flow were also reduced by 35.08% and 26.82%, respectively. Meanwhile, the peak flow of runoff pollution concentration was reduced by 31.99%. The pollutant load reduction rate of non-point source pollution in the area reached more than 45%. The project not only alleviated the problems of urban waterlogging and black and odorous water bodies but also ensured the sustainable development of the urban water environment.
摘要：
The serial compound fluidized bed gasification process of HMSW (high moisture solid waste) is studied, and the semi-empirical kinetic model is established by combining hydrodynamics and reaction kinetics. The model include combustion sub-model and gasification sub-model, which are divided into dense phase and dilute phase for simulation. The dense phase is simulated by the three-phase bubble bed theory, and the dilute phase is simulated by Wen-Chen entrainment elutriation model combined with the ring-core model. The pyrolysis model is based on the empirical relationship. The effects of gasification temperature, S/HMSW (steam/high moisture solid waste) ratio, HMSW/C (high moisture solid waste/coal) ratio, and moisture on the gasification process are studied. The results show that the gasification temperature of 1000 degrees C, S/HMSW of 1.13, HMSW/C of 3, and moisture of 26% are the optimal gasification parameters. The study can guide the design, operation, and optimization of the serial compound gasification process.
期刊：
Transactions of the Indian Institute of Metals,2023年76(5):1221-1227 ISSN：0972-2815
通讯作者：
Bozhi Ren
作者机构：
[Ren, Bozhi; Wang, Xin] Hunan Univ Sci & Technol, Sch Civil Engn, Xiangtan 411201, Hunan, Peoples R China.;[Wang, Xin; Zhang, Chun] Hunan City Univ, Sch Municipal & Mapping Engn, Yiyang 413000, Hunan, Peoples R China.;[Ren, Bozhi] Hunan Prov Key Lab Shale Gas Resource Exploitat, Xiangtan 411201, Hunan, Peoples R China.;[Zhou, Yingying] ChongQing Univ, Coll Environm & Ecol, Chongqing 400044, Peoples R China.
通讯机构：
[Bozhi Ren] S;School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, People’s Republic of China<&wdkj&>Hunan Provincial Key Laboratory of Shale Gas Resource Exploitation, Xiangtan, People’s Republic of China
摘要：
Abandoned tailings are one of the important sources of heavy metal pollution in regions surrounding mining areas. In this study, the speciation and kinetic characteristics of Mn and Pb were analyzed in waste rocks from a manganese mining area. The results show that under different experimental conditions, Mn mainly occurs in the residual state and the iron-manganese oxide-bound state, accounting for more than 90%, and Pb mainly occurs in the residual state, accounting for more than 99%. The cumulative release data in the dynamic leaching experiment can be fitted with a quadratic function. This research aims to provide a scientific basis for relevant decision-making departments to formulate environmental governance and protection strategies in mining areas.
摘要：
Zinc hydrometallurgy residue is one of the main sources of heavy metals in the environment. The chemical components and mineralogical characteristics of the reductive leaching residue was obtained by ICP-AES, XRD and SEM + EDS analysis. The results showed that the main heavy metals in the residue were Pb, Zn, Cd and As. Pb, Zn and Cd in the residue existed as PbSO4, ZnS and CdS, respectively. The three-step sequential extraction procedure study showed that Zn and Cd mainly existed as oxidizable form; Pb and As mainly existed as the residue form. The leaching toxicity results using sulfuric acid and nitric acid method showed that the leaching toxicity of Zn and Cd exceeded the reference values. The potential ecological risk assessment results of heavy metals of the residue showed that the sequence of the environmental activity and ecological risk was Cd > Zn > As > Pb. Cadmium contributed to the potential risk index more greatly than any other heavy metal in the residue and the contribution rate reached 98.9%, which showed that the cadmium in the reductive leaching residue threw the greatest threat to the ecological environment.
期刊：
Transactions of the Indian Institute of Metals,2019年72(10):2591-2597 ISSN：0972-2815
通讯作者：
Zhang, Chun
作者机构：
[Wang, Aihe; Deng, Yumei; Zhang, Chun; Jiang, Haiyan] Hunan City Univ, Sch Municipal & Mapping Engn, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Zhang, Chun] H;Hunan City Univ, Sch Municipal & Mapping Engn, Yiyang 413000, Hunan, Peoples R China.
关键词：
Iron recovery;Oxydrolysis;Goethite;Zinc neutral leaching residue;Magnetic seeds
摘要：
The recovery of iron is the key step for zinc recycling by electrolysis in zinc hydrometallurgy industry. Iron exists mainly as ferrites in the zinc neutral leaching residue and is difficult to decompose. In this paper, the reductive leaching process using sulfur dioxide was adopted to replace the traditional hot-acid leaching method, and the magnetic seed-assisted iron precipitation was developed. Under the optimum reductive leaching conditions, the initial concentration of sulfuric acid, the temperature and the partial pressure were determined as: 80 g/L H2SO4, 90 degrees C, 200 kPa at the fixed liquid/solid ratio of 10:1 and the stirring speed of 400 rpm. The most suitable iron precipitation reaction conditions were as follows: the pH: 3.0-3.5; the temperature: 95 degrees C. The recovery of iron mainly depended on the oxydrolysis of the ferrous. The ferrous precipitated as goethite and its crystallinity noticeably decreased with decreasing pH. The addition of the magnetic seeds shortened the reaction time from 4.5 to 3.0 h when the iron precipitation rate reached more than 99%. Simultaneously, the loss rates of zinc and cadmium in the iron process were also reduced from 10.96% and 9.27% to 4.23% and 3.73%, respectively. Besides, the sedimentation and filtration performance were greatly improved after the addition of magnetic seeds. The adsorption and inclusion were the main reasons for better sedimentation and filtration performance and higher metal loss rate.
作者：
Wang Aihe;Zhou Kanggen*;Liu Xing;Liu Fang;Zhang Chun;...
期刊：
Journal of Colloid and Interface Science,2017年505:947-955 ISSN：0021-9797
通讯作者：
Zhou Kanggen
作者机构：
[Wang Aihe; Chen Quanzhou; Liu Xing; Zhou Kanggen; Liu Fang] Cent S Univ, Sch Met & Environm, Lushan South Rd 932, Changsha 410083, Hunan, Peoples R China.;[Wang Aihe; Zhang Chun] Hunan City Univ, Sch Municipal & Mapping Engn, Yingbin East Rd 518, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Zhou Kanggen] C;Cent S Univ, Sch Met & Environm, Lushan South Rd 932, Changsha 410083, Hunan, Peoples R China.
作者机构：
[王密; 张建强; 闵小波; 张纯; 李辕成] School of Metallurgy and Environment, Central South University, Changsha, China;[闵小波] Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Central South University, Changsha, China;[张纯] School of Municipal and Mapping Engineering, Hunan City University, Yiyang, China
通讯机构：
School of Metallurgy and Environment, Central South University, Changsha, China
