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A novel double dielectric barrier discharge reactor with high field emission and secondary electron emission for toluene abatement

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Plasma Science and Technology 2022年第1期24卷 118-128页

作者： Shijie LI Xin YU Xiaoqing DANG pengyong wang Xiangkang MENG Huachun ZHENG School of Environment&Municipal Engineering Xi'an University of Architecture&TechnologyXi'an 710055People’s Republic of China Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture&TechnologyXi’an 710055People’s Republic of China Key Laboratory of Northwest Water Resources Environment and EcologyMinistry of EducationXi'an University of Architecture and TechnologyXi’an 710055People’s Republic of China

Dielectric barrier discharge(DBD)has been extensively investigated in the fields of environment and energy,whereas its practical implementation is still limited due to its unsatisfactory energy *** order to improve the energy efficiency of DBD,a novel double dielectric barrier discharge(NDDBD)reactor with high field emission and secondary electron emission was developed and compared with traditional DDBD(TDDBD)***,the discharge characteristics of the two DDBD reactors were *** to TDDBD,the NDDBD reactor exhibited much stronger discharge intensity,higher transferred charge,dissipated power and gas temperature due to the effective utilization of cathode field emission and secondary electron ***,toluene abatement performance of the two reactors was *** toluene decomposition efficiency and mineralization rate of NDDBD were much higher than that of TDDBD,which were 86.44%-100%versus 28.17%-80.48%and 17.16%-43.42%versus 7.17%-16.44%at 2.17-15.12 W and 1.24-4.90 W *** also exhibited higher energy yield than TDDBD,whereas the overall energy constant k_(overall)of the two reactors were ***,plausible toluene decomposition pathway in TDDBD and NDDBD was suggested based on organic intermediates that generated from toluene *** finding of this study is expected to provide reference for the design and optimization of DBD reactor for volatile organic compounds control and other applications.

关键词： toluene removal double dielectric barrier discharge field emission secondary electron emission decomposition mechanism

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DBD反应器电极结构对放电特征及甲苯降解效果的影响

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环境工程学报 2022年第7期16卷 2229-2240页

作者：王鹏勇党小庆李世杰于欣王琪孟祥康西安建筑科技大学环境与市政工程学院陕西省环境工程重点实验室西安710055

为研究DBD反应器电极结构对放电特征和甲苯降解效果的影响,设计了具有3种不同结构高压电极(棒、螺纹棒、线圈)和接地电极(铜网、铜带、铜丝)的反应器。通过放电图像、发射光谱、电压-电流波形、李萨如图、放电功率和放电间隙气体温度分... 详细信息

为研究DBD反应器电极结构对放电特征和甲苯降解效果的影响,设计了具有3种不同结构高压电极(棒、螺纹棒、线圈)和接地电极(铜网、铜带、铜丝)的反应器。通过放电图像、发射光谱、电压-电流波形、李萨如图、放电功率和放电间隙气体温度分析了不同电极结构反应器的放电特性;以甲苯去除率、矿化率、能量效率为评价指标,考察了电极结构对甲苯降解效果的影响。结果表明:3种不同结构高压电极反应器的放电强度顺序为线圈>棒>螺纹棒;当甲苯质量浓度为678 mg·m^(−3)、电压为12~20 kV、且以线圈为高压电极时,反应器的放电功率、放电间隙气体温度低,分别为0.4~10.3 W、28~64℃,而对甲苯的去除率、矿化率、能量效率均最高,分别为77.71%~100%、21.03%~35.96%、4.96~8.81 g·kWh^(−1);3种不同结构接地电极反应器中以铜带为接地电极时放电强度最强,对甲苯的去除率、矿化率和能量效率最高,分别为25.3%~100%、3.41%~35.96%、4.96~23.17 g·kWh^(−1)。本研究可为DBD反应器在降解甲苯应用中的结构优化和材料选择提供参考。

关键词：介质阻挡放电电极结构放电特征能量效率温度矿化率

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低温等离子体耦合Co-Mn双金属催化剂降解三氯乙烯

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环境化学 2023年第4期42卷 1185-1195页

作者：侯浩党小庆李世杰于欣王鹏勇孟祥康西安建筑科技大学环境与市政工程学院西安710055 陕西省环境工程重点实验室西安710055

以γ-Al_(2)O_(3)为载体,采用等体积浸渍法制备钴锰催化剂(Co/γ-Al_(2)O_(3)、Mn/γ-Al_(2)O_(3)、Co_(3)Mn_(1)/γ-Al_(2)O_(3)、Co_(1)Mn_(1)/γ-Al_(2)O_(3)、Co_(1)Mn_(3)/γ-Al_(2)O_(3)),研究不同催化剂耦合低温等离子体(NTP)对三氯乙烯的降解性能.与单一NTP相比,NTP耦合催化剂可显著提高三氯乙烯的去除率、COx产率、碳平衡、HCl和Cl2产率,减少副产物的产生.Co-Mn双金属催化剂催化性能高于单一Co和Mn负载的催化剂,其中Co_(3)Mn_(1)/γ-Al_(2)O_(3)具有最高的催化活性,电压为6—10 kV,Co_(3)Mn_(1)/γ-Al_(2)O_(3)耦合NTP对三氯乙烯去除率(39.7%—96.94%)与COx(33.04%—87.36%)产率最高.通过BET、XRD、H2-TPR、XPS表征催化剂的物化性质,以阐明不同催化剂耦合NTP降解三氯乙烯效果存在差异的原因.结果显示,Co_(3)Mn_(1)/γ-Al_(2)O_(3)催化剂具有较高的比表面积,较小的Co_(3)O_(4)晶粒尺寸,较低的还原温度,且催化剂表面上的Mn^(4+)、Co_(3+)和Oads含量更高,有利于三氯乙烯的降解.最后通过GC-MS分析三氯乙烯降解过程中产生的有机中间体,推测了低温等离子体降解三氯乙烯的反应路径.

关键词：低温等离子体钴锰双金属催化剂三氯乙烯去除率副产物

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低温等离子体灭活微生物气溶胶的效果及影响因素

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环境工程学报 2022年第12期16卷 3984-3992页

作者：杨金月党小庆李世杰于欣王赫王鹏勇焦阳西安建筑科技大学环境与市政工程学院西安710055 陕西省环境工程重点实验室西安710055

微生物气溶胶相关的突发性疫情时有发生,故研发新型高效的微生物气溶胶灭活技术已引起广泛关注。采用低温等离子体灭活枯草芽孢杆菌气溶胶,对低温等离子体电学特性和光学特性进行测定诊断,并测定活性氧。从细菌可培养性、细胞膜完整性... 详细信息

微生物气溶胶相关的突发性疫情时有发生,故研发新型高效的微生物气溶胶灭活技术已引起广泛关注。采用低温等离子体灭活枯草芽孢杆菌气溶胶,对低温等离子体电学特性和光学特性进行测定诊断,并测定活性氧。从细菌可培养性、细胞膜完整性、蛋白质泄露及细胞矿化4个方面分析评估灭活效果,并以杀菌率为指标,研究了外加电压、流速及相对湿度对灭活效果的影响。结果表明,低温等离子体可实现枯草芽孢杆菌气溶胶灭活,灭活效果显著。随着外加电压的增加,灭活效率呈上升趋势。在外加电压为10~13 kV时,对应灭活效率为48%~83%。灭活效率与流速成反比,随着流速的增加,灭活效率减小。流速为11~14 L·min^(-1)时,灭活效率为80%~47%。在不同相对湿度条件下,灭活效率呈先上升后下降的趋势。在RH=40%时,灭活效率达到最大值,为86%。这表明低电压、高流速和高相对湿度不利于微生物气溶胶灭活。本研究结果可为低温等离子体灭活微生物气溶胶技术的应用提供参考。

关键词：微生物气溶胶灭活低温等离子体灭活效果影响因素

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中国海洋生物壳体在人工鱼礁中应用的研究进展与展望

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黑龙江环境通报 2023年第6期36卷 7-9页

作者：邱桂博张轩豪盘海王鹏勇王琪中冶建筑研究总院有限公司北京100088 湛江中冶环保运营管理有限公司广东湛江524000 湛江市冶金工业环境保护重点实验室广东湛江524000 广东省钢铁冶炼资源综合利用工程技术研究中心广东湛江524000

中国是海洋生物养殖大国,每年产生大量的贝类和牡蛎等海洋生物壳体废弃物,但目前对该类废弃物的利用率较低,不仅占用大量土地,还对周边环境造成了危害。本文综述了贝类和牡蛎壳体在人工鱼礁中应用的研究现状,介绍了海洋生物壳体添加量... 详细信息

中国是海洋生物养殖大国,每年产生大量的贝类和牡蛎等海洋生物壳体废弃物,但目前对该类废弃物的利用率较低,不仅占用大量土地,还对周边环境造成了危害。本文综述了贝类和牡蛎壳体在人工鱼礁中应用的研究现状,介绍了海洋生物壳体添加量对人工鱼礁性能和生物附着的影响,以及海洋生物壳体人工鱼礁在生态修复的突出效果,并对未来研究重点提出了建议,以期为海洋生物壳体在人工鱼礁应用的推广提供参考。

关键词：海洋生物壳体人工鱼礁性能生物附着生态修复

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Lie Symmetrical Hojman Conserved Quantity of Relativistic Mechanical System

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Communications in Theoretical Physics 2005年第6期43卷 1053-1055页

作者： FANGJian-Hui pengyong YANXiang-Hong CollegeofPhysicalScienceandTechnology UniversityofPetroleumDongying257061China DepartmentofPhysics HexiUniversityZhangye734000China

In this paper, we study the Lie symmetrical Hojman conserved quantity of a relativistic mechanical system under general infinitesimal transformations of groups in which the time parameter is variable. The determining equation of Lie symmetry of the system is established. The theorem of the Lie symmetrical Hojman conserved quantity of the system is presented. The above results are generalization to Hojman's conclusions, in which the time parameter is not variable and the system is non-relativistic. An example is given to illustrate the application of the results in the last.

关键词： relativistic mechanical system lie symmetry hojman conserved quantity

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Sterilization of Escherichia coli cells by the application of pulsed magnetic field

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Journal of Environmental Sciences 2004年第2期16卷 348-352页

作者： LIMei QUJiu-hui pengyong-zhen ResearchCenterforEco-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China. SchoolofMunicipalandEnvironmentalEngineering HarbinInstituteofTechnologyHarbin150090China

The inactivation of microorganisms by pulsed magnetic field was studied. It was improved that the application of electromagnetic pulses evidently causes a lethal effect on E. coli cells suspended in phosphate buffer solution Na 2HPO 4/NaH 2PO 4(0 334/0 867 mmol/L). Experimental results indicated that the survivability(N/N 0; where N 0 and N are the number of cells survived per mill il iter before and after electromagnetic pulses application, respectively) of E. coli decreased with magnetic field intensity B and treatment time t. It was also found that the medium temperatures, the frequencies of pulse f, and the initial bacterial cell concentrations have determinate influences in destruction of E. coli cells by the application of magnetic pulses. The application of an magnetic intensity B=160 mT at pulses frequency f=62 kHz and treatment time t=16 h result in a considerable destruction levels of E. coli cells (N/N 0=10 -4 ). Possible mechanisms involved in sterilization of the magnetic field treatment were discussed. In order to shorten the treatment time, many groups of parallel inductive coil were used. The practicability test showed that the treatment time was shortened to 4 h with the application of three groups of parallel coil when the survivability of *** cells was less than 0 01%; and the power consumption was about 0 2 kWh /m 3.

关键词： Escherichia coli bacteria pulsed magnetic field induced current cell membrane

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Study of control strategy and simulation in anoxic-oxic nitrogen removal process

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Journal of Environmental Sciences 2005年第3期17卷 425-428页

作者： pengyong-zhen wangZhi-hui wangShu-ying KeyLabofBeijingforWaterQualityScienceandWaterEnvironmentalRecoveryEngineering BeijingUniversityofTechnologyBeijing100022China EngineeringCenterofChineseResearchAcademyofEnvironmentalSciences Beijing100012China

The control strategy and simulation of external carbon addition were specially studied in an anoxic-oxic(A/O) process with low carbon: nitrogen(C/N) domestic wastewater. The control strategy aimed to adjust the flow rate of external carbon dosage to the anoxic zone, thus the concentration of nitrate plus nitrite(NOx--N) in the anoxic zone was kept closed to the set point. The relationship was studied between the NOx--N concentration in the anoxic zone(S_ NO) and the dosage of external carbon, and the results showed that the removal efficiency of the total nitrogen(TN) could not be largely improved by double dosage of carbon source when S_ NO reached about 2 mg/L. Through keeping S_ NO at the level of about 2 mg/L, the demand of effluent quality could be met and the carbon dosage could be optimized. Based on the Activated Sludge Model No.1(ASM No.1), a simplified mathematical model of external carbon dosage was developed. Simulation results showed that PI controller and feed-forward PI controller both had good dynamic response and steady precision. And feed-forward PI controller had better control effects due to its consideration of influent disturbances.

关键词： ASM No.1 biological nitrogen removal external carbon addition feed-forward PI control

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Effects of seawater salinity on nitrite accumulation in short-range nitrification to nitrite as end product

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Journal of Environmental Sciences 2004年第2期16卷 247-251页

作者： YUDe-shuang pengyong-zhen ZHANGKui SchoolofEnvironmentalEngineeringandScience QingdaoUniversityQingdao266071China. SchoolofEnvironmentandEnergyEngineering BeijingPolytechnicUniversityBeijing100022China PingdingshanInstituteofTechnology Pingdingshan467001China）

The effect of seawater salinity on nitrite accumulation in short-range nitrification to nitrite as the end product was studied by using a SBR. Experimental results indicated that the growth of nitrobacteria was inhibited and very high levels of nitrite accumulation at different salinities were achieved under the conditions of 25—28℃, pH 7.5? ?.0 , and the influent ammonia nitrogen of 40—70 mg/L when seawater flow used to flush toilet was less than 35%(salinity 12393 mg/L, Cl - 6778 mg/L) of total domestic wastewater flow, which is mainly ascribed to much high chlorine concentration of seawater. Results showed that high seawater salinity is available for short-range nitrification to nitrite as the end product. When the seawater flow used to flush toilet accounting for above 70% of the total domestic wastewater flow, the removal efficiency of ammonia was still above 80% despite the removal of organics declined obviously(less than 60%). It was found that the effect of seawater salinity on the removal of organics was negative rather than positive one as shown for ammonia removal.

关键词： seawater salinity short range nitrification-denitrification to nitrite as the end product nitrite accumulation organics removal efficiency ammonia removal efficiency

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移动机器人导航系统研究

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福建电脑 2020年第7期36卷 87-88页

作者：朱俞竹韩雨薇段睿劼王澎湧陈齐峰中国计量大学量新学院杭州310018 中国计量大学机电工程学院杭州310018

由于机器人技术的发展,许多较为单调、劳动强度大而且危险程度较高的工作逐渐由机器人来替代完成。近年来,机器视觉技术更是日渐完善,而且其应用十分广泛。本文设计了一套基于CMOS摄像头视觉的移动机器人导航系统。该系统根据所采集到... 详细信息

由于机器人技术的发展,许多较为单调、劳动强度大而且危险程度较高的工作逐渐由机器人来替代完成。近年来,机器视觉技术更是日渐完善,而且其应用十分广泛。本文设计了一套基于CMOS摄像头视觉的移动机器人导航系统。该系统根据所采集到的图像信息,自主进行图像识别,经过算法匹配,能够使机器人在预定的轨道上快速、稳定地行驶。

关键词： CMOS摄像头机器视觉导航系统

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