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城镇污水处理厂治污降碳的精细化管控研究

中国给水排水 2024年第12期40卷 13-20页

作者：蒋富海李俊奇张显忠程俊中持水务股份有限公司北京100192 北京建筑大学城市雨水系统与水环境教育部重点实验室北京100044 上海市城市建设设计研究总院<集团>有限公司上海200125 长江生态环保集团有限公司湖北武汉430014

2014年污水处理行业贡献的温室气体排放量占国家排放总量的比例接近1%,城镇污水处理厂作为国家重要的环保集中治污设施,亟待科学了解其污染治理活动与温室气体排放的关联性,在确保污染物去除的同时,通过对其温室气体关键排放点位的控制... 详细信息

2014年污水处理行业贡献的温室气体排放量占国家排放总量的比例接近1%,城镇污水处理厂作为国家重要的环保集中治污设施,亟待科学了解其污染治理活动与温室气体排放的关联性,在确保污染物去除的同时,通过对其温室气体关键排放点位的控制,明确其碳排放的核算边界和指标体系,量化核算与评价其温室气体排放量和排放强度。为此,优化了碳排放核算方式、明确产污参数与排放因子,并开展了处理流程的能(药)耗分析。从工艺设计、设备选型、精准控制、精细化运行等项目全周期环节,提出了系统性的减污降碳优化路径,旨在为污水处理厂的减污降碳、节能降耗协同增效提供参考。

关键词：城镇污水处理厂温室气体碳达峰碳排放碳排放强度节能降耗

Optimization of iron and aluminum recovery in bauxite

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Journal of Iron and Steel Research International 2020年第3期27卷 310-318页

作者： qian Long jun-qi li Chao-yi Chen Yuan-pei Lan Guo-ling Wei Department of Metallurgical Engineering College of Materials and MetallurgyGuizhou UniversityGuiyang 550025GuizhouChina Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving Guiyang 550025GuizhouChina

Recovering iron and aluminum efficiently is the key route to utilize low-grade high-iron *** to optimize the iron separating process and elevate both Fe and Al recovery ratio,three different Fe-Al recovery processes with different magnetic roasting(R),Bayer leaching process(L)and magnetic separation(S)orders were *** studied processes include bauxite leaching→red mud roasting→magnetic separation(L-R-S),bauxite roasting→magnetic separation→leaching(R-S-L)and bauxite roasting→leaching→magnetic separation(R-L-S).The iron recovery ratio,Fe2O3 content in iron concentration and the bauxite dissolution ratio of each process were ***,the optimizations of the leaching,roasting and magnetic separation conditions were *** indicate that the R-S-L process should be an advisable order to recover both alumina and *** the three processes,the R-S-L route had the highest alumina dissolution ratio and iron recovery ratio,which was 86.20%and 69.58%,respectively,while the Fe2O3 content of the iron concentrate was 40.66%.

关键词： High-iron bauxite Magnetic roasting Magnetic separation Recovery ratio Dissolution ratio

Suspension calcination and alkali leaching of low-grade high-sulfur bauxite:Desulfurization, mineralogical evolution and desilication

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International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 602-610页

作者： Hong-fei Wu jun-qi li Chao-yi Chen Fei-long Xia Zhen-shan Xie Department of Metallurgical Engineering College of Materials and MetallurgyGuizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving Guiyang 550025China

To enable the utilization of low-grade and high-sulfur bauxite, the suspension calcination was used to remove the sulfur and the activate silica minerals, and the calcinated bauxite was subjected to a desilication process in Na OH solution under atmospheric pressure. The desulfurization and desilication properties and mineralogical evolution were studied by X-ray diffraction, thermogravimetry–differential thermal analysis, scanning electron microscopy, and FactSage methods. The results demonstrate that the suspension calcination method is efficient for sulfur removal: 84.21% of S was removed after calcination at 1000°C for 2 min. During the calcination process, diaspore and pyrite were transferred to α-Al2O3, magnetite, and hematite. The phase transformation of pyrite follows the order FeS2 → Fe3O4 → Fe2O3, and the iron oxides and silica were converted into iron silicate. In the alkali-soluble desilication process, the optimum condition was an alkali solution concentration of 110 g/L, a reaction time of 20 min, and a reaction temperature of 95°C. The corresponding desilication ratio and alumina loss ratio were 44.9% and 2.4%, respectively, and the alumina-to-silica mass ratio of the concentrate was 7.9. The Al2O3·2SiO2, SiO2, and Al2O3 formed during the calcination process could react with Na OH solution, and their activity decreased in the order of Al2O3·2 SiO2, SiO2, and Al2O3.

关键词： low-grade bauxite sulfur suspension calcination alkali-soluble desilication Bayer process

Solid oxide membrane-assisted electrolytic reduction of Cr_(2)O_(3) in molten CaCl_(2)

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1626-1634页

作者： Bo Wang Chao-yi Chen jun-qi li lin-zhu Wang Yuan-pei Lan Shi-yu Wang College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving Guiyang 550025China

Solid oxide membrane-assisted electrolytic reduction of solid Cr_(2)O_(3) to Cr in molten CaCl_(2) was performed using a sintered porous Cr_(2)O_(3) cathode paired with an yttria-stabilized zirconia(YSZ)tube anode containing carbon-saturated liquid copper *** of the reduction mechanism,ion migration behavior,and effects of cathode pellet porosity and particle size on the electrolysis products and reduction rate revealed that the cathode microstructure and electrolytic conditions were key factors influencing the electrolysis *** results were obtained when the cathode was characterized by high porosity and a small particle size because this combination of features contributed to ion *** electrochemical activation was observed when cathode pellets prepared by 4 MPa molding followed by 2 h of sintering at 1150℃ were *** electrode reduction process(Cr^(3+)→Cr^(2+)→Cr)was promoted by high electrode voltages,and Cr metal was efficiently *** proposed method appears to be well suited for electrolytic Cr production because it does not require expensive pre-electrolysis techniques or generate harmful by-products.

关键词： solid oxide membrane yttria-stabilized zirconia electrometallurgy chromium molten salt

An Improved Synthetic Method of Saquinavir

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Chemical Research in Chinese Universities 2006年第1期22卷 51-55页

作者： YANG qin-gang HE Xu-chang LEI li-jun ZHOU qi-ting BAI Dong-lu Shanghai Institute of Materia Medica Shanghai Institutes of Biological Sciences Chinese Academy of Sciences Shanghai 201203 P. R. China

An improved synthetic method of saquinavir, an HIV protease inhibitor, is described. In comparison with the methods in the reported works, the improved procedures had several advantages, such as less expensive agents, shorter reaction time, and a smaller amount of the solvent needed. To measure the optical purities of the products, the intermediates were determined by means of chiral HPLC. Some of the intermediates can also be used for the preparation of new protease inhibitors.

关键词： HIV Protease inhibitor Saquinavir Synthesis

Image stabilization with support vector machine

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第6期12卷 478-485页

作者： Wen-de DONG Yue-ting CHEN Zhi-hai XU Hua-jun FENG qi li State Key Laboratory of Optical Instrumentation Zhejiang University Hangzhou 31002 7 China

We propose an image stabilization method based on support vector machine (SVM). Since SVM is very effective in solving nonlinear regression problems, an SVM model was constructed and trained to simulate the vibration characteristic. Then this model was used to predict and compensate for the vibration. A simulation system was built and four assessment metrics including the signal-to-noise ratio (SNR), gray mean gradient (GMG), Laplacian (LAP), and modulation transfer function (MTF) were used to verify our approach. Experimental results showed that this new method allows the image plane to locate stably on the CCD, and high quality images can be obtained.

关键词： Support vector machine (SVM) Vibration Displacement Prediction Compensation

Stabilized effects of L-S cement-mixed batter pile composite foundation for existed warm frozen soil subgrade

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Journal of Mountain Science 2023年第2期20卷 542-556页

作者： SUN Gao-chen YAO Gang ZHANG Jian-ming li Bo li jun-qi liAN Wei-ping WEI Yi School of Civil Engineering Xi’an Shiyou UniversityXi’an 710065China China State Construction Engineering Corporation AECOM Consultant Co. Ltd.Lanzhou 730000China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

In permafrost regions with warm frozen soil,subgrade thaw-collapse phenomenon commonly occurs,facing thaw collapse problems of the existed frozen soil subgrade,thus it is difficult to use traditional methods such as active cooling and passive protection technology to stabilize the existed warm frozen soil *** study derives a novel stabilizer method,a long-short(L-S)cement-mixed batter pile composite foundation to stabilize the existed warm frozen soil *** solve the thawcollapse problems in warm frozen soil subgrade,high water content and large compressibility characteristics were compared between soft soil and warm frozen *** analysis of heat conduction and numerical simulation of finite element model were used to study the freeze–thaw process and evaluate the stabilized effects of the L-S cement-mixed batter piles on the warm frozen soil foundation of the qinghai-Tibet ***,the thaw process and mechanical properties of foundation and piles were analyzed by introducing the hydration heat factor in the thermodynamic control *** results indicate that the thawing displacement of the existed warm frozen soil subgrade was reduced owing to the“support”and“grasp”effects of the L-S cement-mixed batter piles on the surrounding *** composite ground formed by strengthening the warm frozen ground with batter piles could considerably improve the bearing capacity of the existed warm frozen ground,effectively restrain the deformation of the upper embankment,and improve the strength of the *** analysis can provide method for the construction design of cement mixing batter pile foundation in cold regions.

关键词： Warm frozen soil subgrade Thaw collapse Thermal disturbance Long-short cementmixed batter pile Existed frozen soil subgrade

Unraveling role of double-exchange interaction in electrochemical water oxidation by external magnetic field

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Rare Metals 2024年第1期43卷 289-297页

作者： jun li jun-Ming li Hong Hong Dong-Xue liu qing-qi Cao Dun-Hui Wang National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing UniversityNanjing 210093China School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China

Double-exchange(DE) interaction plays an important role in electrocatalytic oxygen evolution reaction(OER).However,precise achievement of DE interaction often requires foreign dopants or vacancy engineering,leading to destabilization of the catalysts and deterioration of *** contrast,the utilization of environmentally friendly,contactless,and continuously adjustable magnetic fields to study the OER process is profitable to avoid aforementioned interference factors and further elucidate the direct relationship_(0.5)between DE interaction and OER ***,by using cobalt hydroxide carbonate(Co(OH)(CO_(3))·xH_(2)O,CoHC) nanostructures as a proof-of-concept study,external magnetic fields are carefully implemented to verify the role of DE interaction during water oxidation *** studies reveal that external magnetic fields effectively enhance the reaction rate of the catalyst,the overpotential decreases from 386 to 355 mV(100 mA·cm^(-2)),while Tafel slopes drastically decline from 93 to 67 mV·dec^(-1)(1.0 T).Moreover,magnetic field increment exhibits robust *** in situ Raman and impedance measurements under external field,it can be found that magnetic field promotes the electron migration between Co^(2+) and Co^(3+) in the CoHC catalysts with the assistance of DE interactions,thus boosting the OER efficiency.

关键词： Magnetic field Double-exchange(DE)interaction Electrocatalysis Oxygen evolution reaction(OER) Cobalt hydroxide carbonate

Special Issue:Dynamic Polymer Networks

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Chinese Journal of Polymer Science 2024年第10期42卷 1401-1402页

作者： jun-qi Sun Zhi-Bo li Tao Xie 不详

The ease of processing and light weight have made polymeric materials uniquely suited for numerous general ***,realization of their switchable chain configuration/mobility and molecular design versatility has pushed p... 详细信息

关键词： uniquely realization polymeric