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煤炭科学技术 2023年第11期51卷 248-254页

作者：李福勤薛甜丽高珊珊豆硕超何绪文河北工程大学能源与环境工程学院河北邯郸056038 河北省水污染控制与水生态修复技术创新中心河北邯郸056038 中国矿业大学(北京)化学与环境工程学院北京100083

基于高盐矿井水的零排放和资源化利用,采用BP-A-C-BP三隔室构型的双极膜电渗析处理高盐矿井水浓缩液。以河北某矿高盐矿井水为原水,经过预处理+RO+脱碳+浓水RO+ED浓缩,最终浓缩液TDS质量浓度达到93040 mg/L,进行双极膜电渗析试验,探究... 详细信息

基于高盐矿井水的零排放和资源化利用,采用BP-A-C-BP三隔室构型的双极膜电渗析处理高盐矿井水浓缩液。以河北某矿高盐矿井水为原水,经过预处理+RO+脱碳+浓水RO+ED浓缩,最终浓缩液TDS质量浓度达到93040 mg/L,进行双极膜电渗析试验,探究了电流密度、循环流量以及极室电解质浓度对于双极膜电渗析产酸碱效果的影响。结果表明:电流密度10~40 mA/cm^(2),随着电流密度的增大,操作电压升高,电流效率和产能逐渐减小,能耗逐渐增加,最佳电流密度为30 mA/cm^(2);循环流量10~30 L/h,随着循环流量的增大,电流效率和产能上升、能耗降低,进一步提高循环流量至40 L/h时反而增加能耗,降低产能,最佳循环流量为30 L/h;极室电解质浓度不宜过低、过高,容易增加能耗,浓度适中时的双极膜电渗析的水解离效果最好,最佳极室电解质浓度为2%。初始盐室浓缩液4 L、酸室和碱室分别为去离子水1.5 L、极室2%硫酸钠溶液2 L,电流密度为30 mA/cm^(2),极室循环流量为60 L/h,其他各室循环流量为30 L/h,运行120 min时,酸、碱浓度分别为6.91%、5.38%,达到试验预期目标,电流效率、产能及能耗分别为74.21%、1.49 kg/(m^(2)·h)、1.66 kWh/kg。经双极膜电渗析工艺产生的酸碱液可用于高盐矿井水零排放工艺以及煤炭下游产业链中,实现了浓缩液的非相变资源化,避免出现杂盐难处理的问题,同时也提高了废水的经济价值。

关键词：矿井水处理高盐矿井水双极膜电渗析浓缩液水解离矿井水资源化

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Multi-scale Feature Fusion Extraction Structure for the Leather Defect Detection Algorithm

Multi-scale Feature Fusion Extraction Structure for the Leat...

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Pattern Recognition and Artificial Intelligence (PRAI), International Conference on

作者： xuwen he Hao Li Zihan Huang Xiaorui Xiong Yifan Liu Yuting Yao School of Mathematics and Computer Science Wuhan Polytechnic University Wuhan China

Detection of surface defects using computer vision is a pivotal technology for achieving intelligent manufacturing. Leather products are one of the most widely traded goods in the world, and automatic identification, localization, and detection of surface defects in leather are indispensable for achieving intelligent manufacturing of leather products. This research paper proposes FG-DETR, a multi-scale feature fusion extraction structure for small target detection algorithms. Given the recent success of deep learning methods in various related fields and that certain defects and flaws in leather pictures in our dataset are relatively small. FG-DETR is based on DETR with some improvements as follows, Initially, DETR's ResNet50 network performs feature extraction on the original image and produces four scales of feature maps. Second, we apply a modified Feature Pyramid Network (FPN) to downsample and upsample the four scales of feature maps, followed by the fusion and output of a single feature map. A Gaussian kernel and output then process the fused feature maps as the final feature maps. Finally, the feature maps are merged with the position encoding information and combined into the Transformer encoder-decoder architecture, resulting in the detection outcomes through the Position-wise Feed-Forward Networks (FFN). In our leather dataset, the FG-DETR model is more effective in detecting small targets than DETR, as our leather images are large, and the original DETR is nearly ineffective for images with relatively small defects. The average detection accuracy of medium and large targets also improved, with a 7.6 percentage point improvement at AP50. The experimental findings demonstrate that the multi-scale feature fusion extraction structure significantly enhances the detection accuracy of DETR.

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Efficient Removal of Organic Matter from Biotreated Coking Wastewater by Coagulation Combined with Sludge-Based Activated Carbon Adsorption

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WATER 2022年第15期14卷 2446-2446页

作者： Xia, Yu Li, Weijia he, xuwen Liu, Dannuo Sun, Yichen Chang, Jie Liu, Jing China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China

Coagulation-adsorption can be effective in the removal of the organic matters remaining in biotreated coking wastewater (BTCW), and cheap and efficient adsorbents benefit the widespread application of this technology. In this study, a sludge-based activated carbon (SAC) was prepared using zinc chloride to activate sludge pyrolysis carbon for the treatment of BTCW with coagulation as the pretreatment process. According to Brunauer-Emmett-Teller (BET) and the scanning electron microscope (SEM) analysis, the SAC exhibited a specific surface area of 710.175 m(2)/g and well-developed pore structure. The removal characteristics of the organic matter in BTCW were systematically studied. The results show that 76.79% of the COD in the BTCW was removed by coagulation combined with SAC adsorption, and the effluent COD was below the discharge limit (80 mg/L) (GB16171-2012), with the optimal dosages of polyaluminum chloride and SAC being 150 mg/L and 4 g/L, respectively. Compared with a commercial powdered activated carbon (PAC) (48.26%), the SAC achieved a similar COD removal efficiency (47.74%) at a higher adsorption speed. The removal efficiencies of the hydrophobic components (77.27%) and fluorescent components by SAC adsorption were higher than those by PAC adsorption. The SAC also had an excellent removal effect on complex organic compounds and colored substances in the BTCW, as revealed by UV-vis spectra analyses.

关键词： sludge-based activated carbon biotreated coking wastewater coagulation adsorption organic pollutants

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焦化废水深度处理新技术及其相互耦合特征研究

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煤炭科学技术 2021年第1期49卷 175-182页

作者：何绪文员润吴姁夏瑜何灿中国矿业大学(北京)化学与环境工程学院北京100083 北京水梦源水务科技有限公司北京100019

焦化废水具有水量大、难降解、水质复杂和处理成本高等特点,且随着"两山论"、"零排放"和GB 16171—2012《炼焦化学工业污染物排放标准》等新理念、新标准的提出,传统深度处理技术已难以使焦化废水处理达标;为了使... 详细信息

焦化废水具有水量大、难降解、水质复杂和处理成本高等特点,且随着"两山论"、"零排放"和GB 16171—2012《炼焦化学工业污染物排放标准》等新理念、新标准的提出,传统深度处理技术已难以使焦化废水处理达标;为了使焦化废水稳定达标排放,探讨了以非均相臭氧催化氧化技术、磁混凝技术和聚瓷膜分离技术为核心的单元深度处理新技术及其相互耦合深度处理新技术;分析了新型臭氧催化剂和新型臭氧反应设备、新型重介质、新型膜材料和新型膜结构分别作为非均相臭氧催化氧化技术、磁混凝技术和聚瓷膜分离技术的重要特征;介绍了3种单元新型深度处理技术及其分别耦合技术的应用现状,并指出耦合新型处理技术可以使焦化废水处理后稳定达到废水排放标准或废水回用标准,总结了不同技术的绿色环保、处理成本低、矿化程度高、处理效果好、短流程和运行稳定等技术优势。根据单元深度处理新技术及其分别耦合新技术的特点,形成了完善和成熟的集成技术工艺包,这将是今后焦化废水深度处理新技术发展的新趋势。

关键词：焦化废水深度处理臭氧催化磁混凝聚瓷膜

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Photo-electrocatalytic degradation of cyclic volatile methyl siloxane by ZnO-coated aluminum anode: Optimal parameters, kinetics, and reaction pathways

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SCIENCE OF The TOTAL ENVIRONMENT 2020年 733卷 139246-139246页

作者： Tang, Jiawei Zhang, Chunhui Wang, Liangliang Hu, Yufeng Su, Peidong Wang, Wenqian he, xuwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China Environm Protect Res Inst Light Ind Beijing 100095 Peoples R China Shenzhen Univ Coll Chem & Environm Engn Shenzhen 518060 Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci Key Lab Drinking Water Sci & Technol Beijing 100085 Peoples R China

Cyclic volatile methylsiloxanes (cVMSs) are widely used in industrial processes and consumer products, which have been reported to be potentially toxic to human health due to their persistence and bioaccumulation. In this study, a novel photo-catalytic zinc oxide (ZnO)-coated aluminum (ZnO@Al) anode was prepared by a facile hydrothermal epitaxial process for the purpose of degrading cVMSs in practical wastewater. Morphological data and compositional analysis showed a compact coating layer that had the characteristic peaks of ZnO. To optimize the degradation process, central composite design combined with response surface methodology was applied to acquire the optimum parameters of cVMSs removal, and results indicated the cVMSs removal efficiency was approximately 63.3% at the conditions of current density = 17.3 mA/cm(2), initial pH of electrolyte = 7.8, plate distance = 18 mm, UV intensity = 90 W, and reaction time = 80 min. Furthermore, the photo-electrocatalytic degradation of cVMSs obeys the pseudo-first order kinetic reaction, and the anode exhibited high durability as the attenuation of cVMSs removal efficiency was <6% after four times reuse. It was also observed that with the application period of the anode was extended, the electroflocculation reaction gradually occurred. The FT-IR of the generated flocs and the total ion gas chromatograms mass spectrometer analysis unraveled the methyl groups in Si-CH3 could be easily attacked by hydroxyl radicals to form the intermediates of monohydroxy substituted products (m/z = 298, 372, and 446) and eventually short-chain carboxylic acids, alkyl radical and silicate. The effective removal of cVMSs by photo-electrocatalytic process using ZnO@Al anode provide significant implication in treatment of practical wastewater.

关键词： Photo-electrocatalysis ZnO Methyl siloxanes RSM

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The spectral characteristics of biochar-derived dissolved organic matter at different pyrolysis temperatures

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JOURNAL OF ENVIRONMENTAL CheMICAL ENGINEERING 2021年第5期9卷

作者： he, Changjun he, xuwen Li, Jiajia Luo, Yong Li, Junchao Pei, Ying Jiang, Jinyuan Chinese Res Inst Environm Sci Res Ctr Environm Pollut Control Technol 8 An Wai Da Yang Fang Beijing 100012 Peoples R China China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China

Comprehensive assessment of the dissolved organic matter (DOM) released from biochar is essential because it affects the migration and transformation of pollutants. The pyrolysis temperature and feedstock are the main factors affecting the amount and structure of DOM released from biochar. In this study, biochar-derived DOM was produced from three feedstocks at five temperatures (200-600 degrees C), and the effects of the pyrolysis temperature and feedstock on its components were investigated using UV-vis, Synchronous fluorescence, excitation emission matrix-parallel factor (EEM-PARAFAC) analysis and Fourier transform infrared-two-dimensional-correlation spectroscopy (FTIR-2D-COS). It was found that the biochar-derived DOM contents of the fruit peel and dewatered sludge biochar gradually decreased with increasing pyrolysis temperature;however, the DOM content of fresh human manure biochar increased at 600 degrees C, and a higher DOM content was obtained at low temperatures. The SUVA 254 and SUVA 260 shown that most of the aromatic substances in the DOM existed in the hydrophobic fraction. Moreover, the DOM mainly contained humic acid-like substances and protein-like substances. As the pyrolysis temperature increased, the protein-like and humic acid substances exhibited opposite trends, with higher protein-like contents at high temperatures. In addition, based on the FTIR-2D-COS analysis, the variations in the functional groups of the DOM depended on the pyrolysis temperature and the type of feedstock. This study highlights the importance of combining multiple optical techniques to evaluate biochar-derived DOM and provides valuable information for biochar applications.

关键词： Human Manure-Biochar Dissolved Organic Matter (DOM) FTIR-2D-COS Protein-like Humic acid-like

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Research progress, problems and prospects of mine water treatment technology and resource utilization in China

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CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY 2020年第4期50卷 331-383页

作者： Zhang, Siyu Wang, Hao he, xuwen Guo, Shaoqing Xia, Yu Zhou, Yuexi Liu, Kai Yang, Shipeng China Univ Min & Technol Sch Chem & Environm Engn Beijing 100083 Peoples R China Chinese Res Inst Environm Sci Res Ctr Water Pollut Control Technol Beijing Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci Beijing Peoples R China Tsinghua Univ Sch Environm Beijing Peoples R China

The National Development and Reform Commission and the Energy Bureau jointly issued the 'Plant Water Utilization Development Plan' on January 29, 2013, which requires that China should gradually establish a more complete legal system, macro management and technical support system for mine water in 2015. But so far, due to the influence of geological conditions and other factors, the impurity composition and content of mine water is very different. Based on the comprehensive summary of the theory, method, application technology, practical engineering and processing technology of mine water disaster and its reutilization in China. This article systematically analyzed the latest research progress and achievements, which include basic theory, hydrogeology (supplement) exploration, advanced detection and monitoring as well as early warning. These can further promote application of current technology, develop new technology and methods, point out the challenges and the existing problems of the mine water field, the gaps with requirements of fast, intensive, and large-scale development of the coal industry in China. Finally, the development trends, future important scientific innovation and key technology were discussed. The prospects of the industry and technology were also forecast.

关键词： Mine water resource utilization treatment technology

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A Three-Dimensional Cyclic Multiplication - Convolution Neural Network for Hyperspectral Image Classification

A Three-Dimensional Cyclic Multiplication - Convolution Neur...

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing, UIC-ATC

作者： Xiaorui Xiong Zihan Huang Zhongyin Sheng Zihan Xu xuwen he Qiaoling Lin School of Mathematics and Computer Science Wuhan Polytechnic University Wuhan China

Hyperspectral images have a large amount of spectral and spatial information, and play a significant role in remote sensing. However, the traditional image classification techniques are no longer applicable to the developing hyperspectral remote sensing images, and how to reasonably utilize the rich feature information of hyperspectral images to obtain high-accuracy classification results has become one of the most important research topics at present. This paper proposes a new 3D convolutional neural network to solve the problem of feature wastage in hyperspectral images. The framework cycles the convolutional kernel size, and the number of convolutional kernels increases in a multiplicative relationship for hyperspectral image classification (CM-CNN). Compared with existing neural network frameworks on different datasets, CMCNN achieves the highest Kappa coefficient and confusion matrix accuracy, which are stable at above 95%. From the classification results, there are almost no obvious classification errors.

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微生物燃料电池工作原理及产电性能提升策略

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环境工程技术学报 2024年第2期14卷 699-709页

作者：蒋进元张月何绪文谭伟宋浩洋石冬妮赵洪兵中国环境科学研究院环境污染控制工程技术研究中心中国矿业大学(北京)化学与环境工程学院四川省广元生态环境监测中心站

微生物燃料电池(MFC)是一种解决其他能源在环境方面不足的新技术,目前低能量输出是MFC实际应用的关键瓶颈。基于MFC工作原理,提出微生物活性差、电子迁移阻力、质子传输阻力及阴极还原反应缓慢是MFC能量输出的限制因素,并从以下5个方面... 详细信息

微生物燃料电池(MFC)是一种解决其他能源在环境方面不足的新技术,目前低能量输出是MFC实际应用的关键瓶颈。基于MFC工作原理,提出微生物活性差、电子迁移阻力、质子传输阻力及阴极还原反应缓慢是MFC能量输出的限制因素,并从以下5个方面综述了提升MFC产电性能策略:调节pH和选择最佳盐度,加强微生物代谢活性;改性阳极材料,降低电子迁移阻力;增强电解液电导率、优化隔膜材料及缩短电极间距减小质子传输阻力;制备高效阴极催化剂和选择优异电子受体加快阴极还原反应速率;改进MFC反应器构型,提高整体产电性能。未来,可在合成新型阴极催化剂、降低膜污染、优化微生物生长环境、制备优异的电极材料和改进MFC反应器配置5个方面开展重点研究。

关键词：微生物燃料电池(MFC) 产电性能输出功率微生物活性策略

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Effect of pre-coagulation on catalytic ozonation in the tertiary treatment of coking wastewater: Kinetic and ozone consumption analysis

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JOURNAL OF WATER PROCESS ENGINEERING 2022年 48卷

作者： Wang, Hao Zhang, Siyu he, Can Yuan, Run Wu, Xu Guo, Shaoqing he, xuwen Van Hulle, Stijn W. H. China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China Univ Ghent Dept Green Chem & Technol LIWET Campus KortrijkGraaf Karel De Goedelaan 5 B-8500 Kortrijk Belgium Katholieke Univ Leuven Dept Chem Engn PET Lab J De Nayerlaan 5 B-2860 St Katelijne Waver Belgium

The ozone-based advanced oxidation process in wastewater effluent degrades refractory organics efficiently and significantly. Nevertheless, high energy consumption is a challenge that hinders its widespread application. In this work, the pre-coagulation enhanced catalytic ozonation process for the treatment of biologically treated coking wastewater (BTCW) was investigated. The chemical oxygen demand (COD) removal results indicated that catalytic ozonation has an inadequate removal effect on the organic pollutants in BTCW. Moreover, the two-stage degradation occurred in the COD ozonation process, of which the slow reaction rate in the second stage was the main reason that limited its overall effect. The pre-coagulation overcame the obstacle of the limited effect of catalytic ozonation treatment of BTCW because of its ability to remove hydrophobic organics. The combination of pre-coagulation with catalytic ozonation could increase the COD removal efficiency from 45% to 69% compared with catalytic ozonation alone. There was a linear relationship between specific ozone consumption and ozone dosage regardless of whether BTCW was subjected to pre-coagulation. The fact that the slope of this linear relationship with pre-coagulation was much smaller than that without pre-coagulation. It indicates that pre-coagulation could significantly reduce ozone consumption. The primary role of pre-coagulation was to reduce ozone consumption considerably in the second stage of the ozonation process. The ozone consumption per unit mass of COD in the second stage reached 24.3 gO(3)/gCOD without pre-coagulation, while that was only 6.8 gO(3)/gCOD with pre-coagulation.

关键词： Coking wastewater Catalytic ozonation Pre-coagulation Kinetic model Consumption analysis

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