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Removal of refractory organics and heavy metals in landfill leachate concentrate by peroxi-coagulation process

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Journal of Environmental Sciences 2022年第6期34卷 43-51页

作者： Dun liu Ying Yuan Yuquan Wei Hao Zhang yanxiao Si Fang Zhang School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Big Data-based Precision Medicine Beihang UniversityBeijing 100191China

Landfill leachate is a complex effluent and it is difficult to deal with. Electrochemical methods have been considered as a promising alternative technology for treatment of landfill leachate with refractory organic contaminants and heavy metals. Peroxi-coagulation(PC)process with iron anode and modified graphite felt cathode was developed for efficient landfill leachate concentrate treatment. Compared to electro-Fenton(EF) and electrocoagulation(EC) processes, the PC process was more cost-effective due to the combined action of·OH oxidation and iron hydroxides coagulation. A maximal TOC removal of 77.2% ± 1.4% was obtained after 360 min at initial p H = 5.0 and current density of 10 m A/cm^(2). After the PC process, concentrations of all seven heavy metals in the final effluents were below the allowable emission limits given by the present regulatory standards. The method preference for heavy metal removal was PC > EC > EF. Based on the three-dimensional fluorescence spectroscopy coupled with regional integration analysis during the PC treatment, the florescence peaks of both humic acids and fulvic acids disappeared after treatment for 360min. Decreasing trends were observed in the fluorescent regional standard volumes for aromatic protein Ⅰ(31.4%), aromatic protein Ⅱ(63.7%), fulvic acid-like(69.5%), soluble microbial by-product-like(75%) and humic acid-like regions(76.3%). The results indicate that comparing to the EF and EC process, the PC process provide a promising and more cost-effective alternative for the treatment of landfill leachate concentrate.

关键词： Landfill leachate Peroxi-coagulation Electro-Fenton Electrocoagulation Modified cathode

Effect of current density on groundwater arsenite removal performance using air cathode electrocoagulation

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 211-219页

作者： yanxiao Si Fang Zhang Chen Hong Guanghe Li Haichuan Zhang Dun liu School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Surface Engineering Division Sinopec Petroleum Exploration and Production Research InstituteBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

Naturally occurring arsenic enrichment in groundwater poses a huge threat to human *** cathode electrocoagulation(ACEC)has recently been proposed to enhance As(Ⅲ)oxidation and lower energy *** this study,ACEC,EC/O_(2) and EC/N_(2) were evaluated with different current densities from 1 to 8 mA/cm^(2) to investigate the effect on As(Ⅲ)removal in different redox *** density had no appreciable effect on arsenic removal efficiency given the same charge in ACEC because the concentration ratio of Fe/H2O_(2) under different current densities remained ***,in EC/O_(2) and EC/N_(2),As(Ⅲ)removal was inhibited at higher current densities(4–8 mA/cm^(2)),likely because more Fe(Ⅱ)competed with As(Ⅲ)for the oxidant,leading to less effective oxidation of As(Ⅲ).In all EC systems,the$OH units generated per power consumption reached the highest value at the lowest current *** with other EC systems,the ACEC system showed lower energy consumption at all current densities due to the low energy consumption of the electrode reaction and more free radical generation.A lower current density saved more energy at the expense of time,showing the trade-off relationship between energy consumption and removal *** operation costs for As(Ⅲ)removal under optimal conditions were calculated as 0.028$/m^(3) for ACEC,0.030$/m^(3) for EC/O_(2),and 0.085$/m^(3) for EC/N_(2)

关键词： Electrocoagulation Air cathode Arsenic Current density Energy consumption

经椎弓根动态非融合技术治疗单节段腰椎退行性变疗效的Meta分析

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浙江实用医学 2022年第5期27卷 369-374,391页

作者：厉彦成何飞熊刘延晓饶建伟叶舟李磊温州医科大学附属医院(衢州市人民医院) 浙江衢州324000

目的通过Meta分析比较经椎弓根动态非融合术和传统椎间融合术在治疗单节段腰椎退行性变疾病中的临床疗效。方法计算机检索Pub Med、Embase及Cochrane library 3个数据库,由两名研究者对检索到的文献进行纳入与排除,评价文献质量后提... 详细信息

目的通过Meta分析比较经椎弓根动态非融合术和传统椎间融合术在治疗单节段腰椎退行性变疾病中的临床疗效。方法计算机检索Pub Med、Embase及Cochrane library 3个数据库,由两名研究者对检索到的文献进行纳入与排除,评价文献质量后提取所需要的数据,应用Review Manager 5.3软件进行Meta分析。结果共筛选出10篇文献,纳入539例患者,其中动态非融合组312例,椎间融合组227例。Meta分析结果显示,动态非融合组与椎间融合组在术后腰椎JOA、腰背痛VAS、下肢痛VAS、ODI上的差异均无统计学意义(P>0.05);两组术式对手术上位相邻节段ROM的影响差异具有统计学意义(MD=-1.65,95%CI:-2.92--0.38,P=0.01),而在手术下位相邻节段ROM差异无统计学意义(MD=0.55,95%CI:-1.19-2.30,P=0.54)。结论经椎弓根动态非融合术可同样改善患者临床症状,提高手术疗效,但对保护手术相邻节段、预防退变短期疗效并不明显,需长期随访。

关键词：腰椎退行性变疾病经椎弓根动态稳定系统腰椎融合 Meta分析

甲状腺乳头状癌中紧密连接蛋白-1的表达与临床意义

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安徽医药 2022年第1期26卷 136-139页

作者：侯卫东禹远远李会敏刘艳晓刘艳锋平顶山市第一人民医院内分泌代谢科河南平顶山467099 中国人民解放军联勤保障部队第九八九医院平顶山医疗区病理科河南平顶山467099

目的探讨甲状腺乳头状癌(PTC)组织中紧密连接蛋白-1(Claudin-1)的表达与临床意义。方法收集2017年1月至2019年10月平顶山市第一人民医院和中国人民解放军联勤保障部队第九八九医院平顶山医疗区甲状腺手术存档标本共计271例。采用免疫组... 详细信息

目的探讨甲状腺乳头状癌(PTC)组织中紧密连接蛋白-1(Claudin-1)的表达与临床意义。方法收集2017年1月至2019年10月平顶山市第一人民医院和中国人民解放军联勤保障部队第九八九医院平顶山医疗区甲状腺手术存档标本共计271例。采用免疫组化EliVision两步法检测116例PTC、145例甲状腺良性病变(BTL)和10例甲状腺滤泡癌中Claudin-1的表达状况,并分析其表达与PTC病人临床病理特征之间的关系。结果在116例PTC中Claudin-1高表达率为97.4%;在145例BTL中高表达率为11.7%;在10例滤泡癌中高表达率为10.0%。此外,Claudin-1在16例有PTC转移的淋巴结中全部高表达(100%),并且与甲状腺内原发癌灶的表达一致;在40例肿瘤周围的正常甲状腺组织中全部不表达。Claudin-1表达在PTC与BTL(χ^(2)=189.282)、PTC与滤泡癌的比较(χ^(2)=71.810),均差异有统计学意义(均P0.05)。Claudin-1诊断PTC的灵敏度为97.4%,Claudin-1在PTC分别与BTL和滤泡癌的鉴别诊断中的特异度为88.3%和90.0%。结论Claudin-1有助于PTC分别与BTL和滤泡癌的鉴别诊断;Claudin-1的高表达可能是PTC肿瘤细胞黏附性强的关键因素。

关键词：甲状腺肿瘤癌,乳头状甲状腺良性病变诊断,鉴别紧密连接蛋白-1

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血鹦鹉人工养殖模式和疾病防控技术

黑龙江水产 2022年第5期41卷 55-58页

作者：刘彦萧陈移波王春鹿段永楠吕欢天津嘉禾田源观赏鱼养殖有限公司天津301809

血鹦鹉(Amphilophus citrinellus×Cichlasoma synspilum)是常见观赏鱼,也被称之为财神鱼、发财鱼,其具有生长迅速、抗病力高、适应性强、性情温和等特点和优势,深受消费者的喜爱。血鹦鹉人工养殖时,科学的养殖技术是影响养殖成功率及... 详细信息

血鹦鹉(Amphilophus citrinellus×Cichlasoma synspilum)是常见观赏鱼,也被称之为财神鱼、发财鱼,其具有生长迅速、抗病力高、适应性强、性情温和等特点和优势,深受消费者的喜爱。血鹦鹉人工养殖时,科学的养殖技术是影响养殖成功率及养殖效益的重要因素。文章从池塘养殖和水泥池养殖两个方面介绍了血鹦鹉的人工养殖模式,并对血鹦鹉在养殖过程中常见的寄生虫性疾病和细菌性疾病的防治技术进行了阐述,可供广大血鹦鹉养殖爱好者参考。

关键词：血鹦鹉(Amphilophus citrinellus×Cichlasoma synspilum) 人工养殖疾病防控

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胃超高分化腺癌12例临床病理学特征分析

中华病理学杂志 2022年第2期51卷 96-102页

作者：侯卫华段心科侯卫东刘艳晓王俊宏王新钊马丽娟石中月李启萌金木兰解放军联勤保障部队第九八九医院平顶山医疗区(原第一五二中心医院)病理科平顶山467099 解放军联勤保障部队第九八九医院平顶山医疗区(原第一五二中心医院)消化内科平顶山467099 河南省平顶山市第一人民医院内分泌代谢科平顶山467099 首都医科大学附属北京朝阳医院病理科北京100020

目的探讨胃超高分化腺癌(very well differentiated adenocarcinoma,VWDA)的临床病理学特征。方法收集2013年1月至2021年5月解放军联勤保障部队第九八九医院平顶山医疗区(原第一五二中心医院)诊断的胃VWDA 12例,收集患者的临床病理资料... 详细信息

目的探讨胃超高分化腺癌(very well differentiated adenocarcinoma,VWDA)的临床病理学特征。方法收集2013年1月至2021年5月解放军联勤保障部队第九八九医院平顶山医疗区(原第一五二中心医院)诊断的胃VWDA 12例,收集患者的临床病理资料,观察其组织形态学特征和免疫表型,并结合文献进行分析。结果12例患者中男8例,女4例,中位年龄63岁(范围47~80岁)。胃上部6例,胃中部2例,胃下部4例。肿瘤中位直径17 mm(范围5~65 mm)。构成肿瘤的细胞类似吸收细胞、Paneth细胞、小凹上皮细胞和杯状细胞。细胞单层排列,核轻度增大位于基底侧,核呈纺锤形至轻度不规则形,核极向紊乱。早期胃管状VWDA 9例,肿瘤腺管类似肠上皮化生的腺管,其中2例浸润至黏膜下层,黏膜深部及黏膜下层的病变表现为腺管囊性扩张、弯曲、分支、尖角,以及流产型腺管。早期胃乳头状管状VWDA 1例,癌局限于黏膜层内,由小凹型上皮细胞构成。胃进展期乳头状管状VWDA 2例,由小凹型上皮、幽门腺或颈黏液细胞构成,且伴有淋巴管内癌栓和淋巴结转移。所有病例背景黏膜均见萎缩和肠上皮化生。免疫组织化学染色显示肠型1例,胃肠混合型9例,胃型2例。仅局限于黏膜内的8例胃VWDA Ki-67阳性指数40%~70%,2例浸润到黏膜下层的癌和2例进展期癌Ki-67阳性指数10%~25%。所有肿瘤均显示p53蛋白呈野生型表达模式、HER2阴性。在术前活检中被诊断为腺癌或高级别异型增生5例、慢性萎缩性胃炎伴肠上皮化生7例。术后中位随访时间28个月(范围12~72个月),10例早期癌未见复发;2例进展期癌中1例发生肺转移,另1例死亡。结论胃VWDA是罕见的低度恶性肿瘤,具有高分化腺癌的结构特征和极低度的细胞学异型性。结构异型性的诊断价值显著大于细胞学异型性,黏膜深部和黏膜下层的不规则腺管浸润性生长是诊断的可靠依据。黏膜内VWDA诊断具有挑战性,活检标本中的部分病例难以明确诊断。

关键词：胃肿瘤腺癌细胞分化诊断,鉴别细胞结构

Optimization of confined aquifer dewatering for long-deep excavation using simulation–optimization method

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Underground Space 2024年第4期17卷 246-266页

作者： yanxiao Sun Zhenxiong Jiang Liyuan Tong Jiawei Sun Jia Cui Xin Zhou Songyu liu Institute of Geotechnical Engineering Southeast UniversityNanjing 211189China Nanjing Modern Multimodal Transportation Laboratory Nanjing 211100China Jiangsu Provincial Transportation Construction Bureau Nanjing 210004China

The confined aquifer dewatering for long-deep excavations usually encounters challenges due to complicated geotechnical conditions,large excavation sizes,and high hydraulic *** propose the most efficient scheme of confined aquifer dewatering for long-deep excavations,dewatering optimizations were performed using the simulation–optimization *** open cut tunnel of the Jiangyin-Jingjiang Yangtze River Tunnel Project was taken as an *** methods of finite element and linear programming(LP)were combined to optimize the dewatering process.A three-dimensional finite element model was *** simulating the pumping tests,hydraulic conductivity was ***,necessary parameters in the LP method were determined by simulating dewatering with each pumping well,and various LP models were developed based on some important influence factors such as dewatering sequence,considered pumping wells,and pumping rate ***,the optimal pumping rates were solved and applied to the numerical model,with induced drawdown and ground settlement computed for *** results indicate that the optimization can significantly reduce the required wells in the original *** in the deepest zone exhibits the highest efficiency for long-deep excavations with gradually varying *** the dewatering sequence from the shallowest to the deepest zone,more pumping wells are required but less energy is *** quantity and more advantageous locations of pumping wells in the LP model usually result in lower total pumping rate,drawdown,and ground *** more pumping wells are considered in the deepest zone,pumping rate limitation of single well will only slightly increase the total pumping rate,number of required pumping wells,drawdown,and ground settlement.

关键词： Dewatering Confined aquifer Simulation-optimization Linear programming Open cut tunnel

Efficient production of poly-γ-glutamic acid by Bacillus velezensis via solid-state fermentation and its application

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Food Bioscience 2022年第2期46卷 631-638页

作者： Hong liu Qiaojuan Yan Yuchuan Wang yanxiao Li Zhengqiang Jiang Key Laboratory of Food Bioengineering(China National Light Industry) College of EngineeringChina Agricultural UniversityBeijing100083China Beijing Advanced Innovation Center for Food Nutrition and Human Health College of Food Science&Nutritional EngineeringChina Agricultural UniversityBeijing100083China

A novel glutamate-dependent poly-γ-glutamic acid(γ-PGA)-producing strain Bacillus velezensis CAU263 isolated from Chinese traditional Douchi was *** efficient method ofγ-PGA production was performed by this strain via solid-state fermentation(SSF)using guar *** maximal yield ofγ-PGA reached 158.5 g/kg dry weight(DW)in 250 mL flasks and 155.1 g/kg DW in shallow tray,*** molecular weight ofγ-PGA was 3.8×106 Da,the ratio of L/D-glutamic acid was 26.1%and 73.9%.Additionally,γ-PGA significantly improved the operating characteristics of wheat dough,the specific volume of bread was increased by 15.8%and the bread hardness was reduced by 44.2%owing to the addition of 0.3 g/kgγ-***,γ-PGA could be produced by Bacillus velezensis CAU263 at high level using guar meal and might have potential application prospect in food industry.

关键词： Bacillus velezensis Poly-γ-glutamic acid Guar meal Solid-state fermentation Bread quality

Enhanced photocatalytic N2 fixation by promoting N2 adsorption with a co-catalyst

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Science Bulletin 2019年第13期64卷 918-925页

作者： Xiang Gao Li An Dan Qu Wenshuai Jiang yanxiao Chai Shaorui Sun Xingyuan liu Zaicheng Sun State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100190China Center of Excellence for Environmental Safety and Biological Effects Beijing Key Laboratory of Green Catalysis and Separation Department of Chemistry and Chemical EngineeringSchool of Environmental and EnergyBeijing University of TechnologyBeijing 100124China

Photocatalytic N2 fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N2 into ***,the adsorption of N2 is the limiting step for the N2 reduction reaction on the surface of the *** on the concept of photocatalytic water splitting,the photocatalytic efficiency can be greatly enhanced by introducing a *** this report,we proposed a new strategy,namely,the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N2 *** calculation results indicated that N2 was effectively adsorbed onto the NiS/CdS *** programmed desorption studies confirmed that the N2 molecules preferred to adsorb onto the NiS/CdS *** sweep voltammetry results revealed that the overpotential of the N2 reduction reaction was reduced by loading ***,transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing *** N2 fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial *** a result,1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L-1 for the first hour under full spectrum and visible light(λ>420 nm),*** catalyst demonstrated apparent quantum efficiencies of 0.76%,0.39% and 0.09% at 420,475 and 520 nm,res *** study provides a new method to promote the photocatalytic efficiency of N2 fixation.

关键词： N2 fixation Photocatalyst Co-catalyst N2 adsorption NiS