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Search Results: 1 - 10 of 119375 matches for " Chengduan Wang "
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Comparing a small gravel-less perforated pipe leach fields (GPPLF) to a medium one in treating domestic sewage  [PDF]
Yiheng Yang, Chengduan Wang, Zhenhua Dang
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.43029
Abstract: There were obvious differences between a medium gravel-less perforated pipe leach fields and a small system in the treatment of demestic sewage with the change of influent quality. In small system, COD removal rate was 91%, ammonia nitrogen removal rate was 90%, total nitrogen was 58%. In medium system, COD removal rate was 86.07%, ammonia nitrogen removal rate was 45.3%, and total nitrogen was 48.2%. This paper studied on the differences. Its main reasons were as follows: differences in opening rate (perforated area account of the total area in infiltration pipe), air flow conditions, exterior environment, and wastewater distribution. Considering those problems, Solutions and applications for the development of GPPLF are given.
Research on Side Reform Strategies of Service Supply in Dazhou  [PDF]
Zibiao Cheng, Chengduan Wang, Xiaoyi Liu
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.612021
Abstract: Dazhou is a large industrial and agricultural city with a huge population. The proportion of service industry in GDP is lower than the secondary industry. Compared with the overall level of the whole country, there is a big gap, and the development potential of service industry is huge. There are three major obstacles to the supply-side reform of the service industry in Dazhou: unsuitable institutional supply and transformational development, uncoordinated consumption supply and market demand, and unbalanced talent supply and development needs. In order to solve these problems, it is required to strengthen the supply of the system, accumulate the power of transformation, improve the quality of supply, guide the return of consumption, strengthen the supply of talents, and create a dynamic state of Dazhou to promote the transformation and upgrading of the service industry. While maintaining the growth rate of the service industry, it must integrate with agriculture and industry, and provide services for the development of agriculture and industry and a platform to foster the new vitality of Dazhou’s economic development.
On the Origin, Development and Prospect of Rural Tourism in China  [PDF]
Zibiao Cheng, Chengduan Wang, Aili Pu
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.812162
Abstract: This paper explores the origin of rural tourism in China, and holds that rural tourism in China originated from the first Litchi Festival held in Shenzhen in 1988. Through the analysis of the development history of rural tourism in China for 30 years, the development of rural tourism in China is divided into three stages, which predicts the development direction of rural tourism in China.
A Study on Synergistic Development of All-for-One Ecotourism of Chengdu-Chongqing Urban Cluster  [PDF]
Zibiao Cheng, Chengduan Wang
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105379
Chengdu-Chongqing Urban Cluster boasts abundant cultural and natural tourism resources. However, its socioeconomic effect remains non-prominent due to backward infrastructure, shortage of ecotourism talents and insufficient synergistic development. We must seek to promote a synergistic development of all-for-one ecotourism so as to enhance the socioeconomic effect of Chengdu-Chongqing Urban Cluster. All these cannot do without concerted efforts from government, tourism businesses and tourists.
Main factors affecting gravel-less perforated pipe leach fields

Wang Chengduan,Dang Zhenhua,

环境工程学报 , 2012,
Abstract: 为了进一步明确植物、土壤、管道对无砾石微孔管地下渗滤系统中污染物去除的贡献能力大小,采用2种植物、2种管道、2种土壤组合形成8个平行系统,采用对比实验方法研究了植物、管道、土壤对地下渗滤系统中污染物去除效果的改变。结果表明,植物、土壤、管道任一因素的单独影响效应显著,但是组合后的交互效应不存在显著差异。而且,在土壤、植物、管道3因素中限定其中2个因素,对比研究另外一种因素的条件下,得到在COD、TP、NH4+-N、TN的去除效果上,变化趋势相同,均是渗滤管外径200mm〉渗滤管外径160mm,吉祥草〉灯芯草,砂壤土〉粘土,且部分存在显著性差异(P〈0.05)。
Efficency of treating inorganic wastewater from laboratory using flocculation and activated carbon

Zhao Li,Wang Chengduan,Liu Gangcai,

环境工程学报 , 2012,
Abstract: 采用两级絮凝-活性炭吸附法处理实验室无机废水,研究了该方法对重金属、硫化物、挥发酚、苯胺和浊度等的处理效果。结果表明,在絮凝温度、搅拌、曝气及污水pH值调节范围一定的情况下,硫酸亚铁(FeSO4·7H2O)与聚合氯化铝(PAC)结合的二级絮凝方法能有效地降低污水中的重金属和硫化物等污染物。二级絮凝处理中,使用聚合氯化铝(PAC)对一级絮凝中去除效果不好的Cr6+的去除效果显著,去除率达到90%以上;活性炭对苯胺和硫化物的去除效果最佳,去除率都在90%以上。同时,该方法还有效降低了废水的浊度和色度。因此,是一种快速、低成本和工艺简单的处理实验室废水的有效途径。
Analysis on Energy Consuming of Polypropylene Tubular Membrane Microfiltration in Rotating Tangential Flow

Wang Chengduan,Hou Feng,Chen Wenmei,

环境科学 , 2002,
Abstract: A new type of polypropylene tubular membrane module in rotating tangential flow was designed to experimentally study energy consuming of the polypropylene PA tubular membrane microfiltration. Through the experimental system of rotating tangential flow which was set up to enhance the microfiltration, the polypropylene PA tubular membrane fluxes and energy efficiency of rotating tangential flow and axial flow were measured under different fluid pressures. The experimental results demonstrate that rotary tangential flow tubular membrane microfiltration was a high efficiency technology of membrane separation. At test conditions, the stable energy efficiency of linear and circular tangential flow were higher than 11.185 times and 14.591 times of the stable energy applying efficiency of axial flow respectively.
Two step hybrid stable surface flow wetland systems for domestic wastewater treatment

Deng Lei,Wang Chengduan,Dang Zhenhua,Zhang Jun,

环境工程学报 , 2012,
Abstract: 为了提高一级稳定表流湿地(stable surface flow wetland,SSFW)的出水水质,在单级稳定表流湿地后串联一级潜流人工湿地,构成两级混合稳定表流湿地(two steps hybrid stable surface flow wetland,TSHSSFW),研究气候变化对其净化效果的影响,并同一级潜流人工湿地(one step subsurface flow wetland, OSSFW)进行对比。研究表明,气候变化对TSHSSFW的COD和总磷去除率影响较小,去除率均在80%左右;而对氨氮和总氮的去除率影响比较大,夏季TSHSSFW的氨氮和总氮去除率分别为87.77%和77.74%,而冬季氨氮和总氮的去除率分别为54.07%和48.84%。相比单级潜流人工湿地(OSSFW),有SSFW作为前处理的潜流人工湿地对氨氮和总氮的去除率较高。
Flow Field Test on the Tangential Section of Polypropylene Tubular Mem brane Module Annular Gap in Rotating Linear Tangential Flow

Wang Chengduan,Chen Wenmei,Li Jianming,Jiang Guangming,

环境科学 , 2002,
Abstract: A new type of polypropylene tubular membrane apparatus of rotating cross flow was designed to study experimentally the flow field characteristics of the tangential section of the membrane annular gap. The authors designed rotary linear tangential flow tubular membrane separator and its test system for the first time. Through the system, the flow field of rotary linear tangential flow with the advanced Particle Image Velocimetry (PIV) was tested for the first time. A lot of streamlines and vorticity maps of the tangential section of separator in different operation conditions were obtained. The velocity distribution characteristics were analyzed quantitatively: 1. At non-vortex area, no matter how the operation parameters change, the velocity near to rotary tangential flow entrance was higher than the velocity far from entrance at the same radial coordinates. At vortex area, generally the flow velocity of inner vortex was lower than the outer vortex. At the vortex center, the velocity was lowest, the tangential velocity were equal to zero generally. At the vortex center zone, the tangential velocity was less than the axial velocity. 2. Under test operations, the tangential velocity and axial velocity of vortices borders are 1-2 times of average axial velocity of membrane module annular gap. The maximum tangential velocity and axial velocity of ellipse vortices were 2-6 times of average axial velocity of membrane module annular gap. 3. The vortices that are formed on the tangential section, there existed mass transfer between inner and outer parts of fluid. Much fluid of outer vortices got into the inner ones, which was able to prevent membrane tube from particles blocking up very soon.
Pilot-scale study on treatment of domestic sewage by gravel-less perforated pipe leach fields system

Dang Zhenhu,Wang Chengduan,Yang Yiheng,Deng Lei,Zhang Jun,

环境工程学报 , 2012,
Abstract: 进行了无砾石微孔管地下渗滤系统处理生活污水的中试研究。基于不同土壤、不同管径、不同植物的协同效应,对比研究了不同系统处理污水中有机物、氮、磷和SS的去除效果及其影响因素。结果表明,不同土壤、不同管径及不同植物组成的系统,对生活污水中有机物、氮、磷和SS的去除效果差别较大。中试系统对COD、总磷、氨氮、总氮和SS的最佳去除率分别达到86.13%、90.20%、61.24%、65.49%和97.43%,对应的出水COD、总磷、氨氮、总氮和SS的平均浓度分别为64.29、0.69、22.13、26.19和5.56 mg/L。分析表明,进水SS浓度过高、外界温度下降等共同作用是导致系统对生活污水中NH+4-N和TN的去除率相对较低的主要原因。
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