标题: Performance investigation of electrochemical assisted HClO/Fe2+ process for the treatment of landfill leachate
作者: Ye, ZH (Ye, Zhihong); Miao, F (Miao, Fei); Zhang, H (Zhang, Hui)
来源出版物: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH DOI: 10.1007/s11356-022-19174-2提前访问日期: FEB 2022
摘要: The feasibility of removal of chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) from landfill leachate by an electrochemical assisted HClO/Fe2+ process is demonstrated for the first time. The performance of active chlorine generation at the anode was evaluated in Na2SO4/NaCl media, and a higher amount of active chlorine was produced at greater chloride concentration and higher current density. The probe experiments confirmed the coexistence of hydroxyl radical ((OH)-O-center dot) and Fe(IV)-oxo complex ((FeO2+)-O-IV) in the HClO/Fe2+ system. The influence of initial pH, Fe2+ concentration, and applied current density on COD and NH4+-N abatement was elaborately investigated. The optimum pH was found to be 3.0, and the proper increase in Fe2+ dosage and current density resulted in higher COD removal due to the accelerated accumulation of (OH)-O-center dot and (FeO2+)-O-IV in the bulk liquid phase, whereas, the NH4+-N oxidation was significantly affected by the applied current density because of the effective active chlorine generation at higher current but was nearly independent of Fe2+ concentration. The reaction mechanism of electrochemical assisted HClO/Fe2+ treatment of landfill leachate was finally proposed. The powerful (OH)-O-center dot and (FeO2+)-O-IV, in concomitance with active chlorine and M((OH)-O-center dot), were responsible for COD abatement, and active chlorine played a key role in NH4+-N oxidation. The proposed electrochemical assisted HClO/Fe2+ process is a promising alternative for the treatment of refractory landfill leachate.
PubMed ID: 35169949
文献类型: Article; Early Access
作者关键词: Advanced oxidation process; Active chlorine; Electrochemical Fenton-type process; Landfill leachate; COD; NH4+-N
地址: [Ye, Zhihong; Miao, Fei; Zhang, Hui] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.
[Ye, Zhihong] Chongqing Univ, Coll Environm & Ecol, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing 400045, Peoples R China.
通讯作者地址: Ye, ZH; Zhang, H (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.
Ye, ZH (通讯作者)，Chongqing Univ, Coll Environm & Ecol, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing 400045, Peoples R China.
博士生沈航，李霖的论文在ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION刊出
标题: A Pricing Model for Urban Rental Housing Based on Convolutional Neural Networks and Spatial Density: A Case Study of Wuhan, China
作者: Shen, H (Shen, Hang); Li, L (Li, Lin); Zhu, HH (Zhu, Haihong); Li, F (Li, Feng)
来源出版物: ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION卷: 11期: 1文献号: 53 DOI: 10.3390/ijgi11010053出版年: JAN 2022
摘要: With the development of urbanization and the expansion of floating populations, rental housing has become an increasingly common living choice for many people, and housing rental prices have attracted great attention from individuals, enterprises and the government. The housing rental prices are principally estimated based on structural, locational and neighborhood variables, among which the relationships are complicated and can hardly be captured entirely by simple one-dimensional models; in addition, the influence of the geographic objects on the price may vary with the increase in their quantities. However, existing pricing models usually take those structural, locational and neighborhood variables as one-dimensional inputs into neural networks, and often neglect the aggregated effects of geographical objects, which may lead to fluctuating rental price estimations. Therefore, this paper proposes a rental housing price model based on the convolutional neural network (CNN) and the synthetic spatial density of points of interest (POIs). The CNN can efficiently extract the complex characteristics among the relevant variables of housing, and the two-dimensional locational and neighborhood variables, based on the synthetic spatial density, effectively reflect the aggregated effects of the urban facilities on rental housing prices, thereby improving the accuracy of the model. Taking Wuhan, China, as the study area, the proposed method achieves satisfactory and accurate rental price estimations (coefficient of determination (R-2) = 0.9097, root mean square error (RMSE) = 3.5126) in comparison with other commonly used pricing models.
作者关键词: rental housing price; POI; geographic information systems; deep learning
地址: [Shen, Hang; Li, Lin; Zhu, Haihong; Li, Feng] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
通讯作者地址: Li, L (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
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