人工湿地污水处理技术研究进展

在目前的状况下,污水处理技术已经能够运用于人工湿地工程,从而达到净化人工湿地的目标。因此该文结合污水处理领域的主要处理手段,通过分析污水处理技术运用于人工湿地净化的必要性,从而给出当前研究人工湿地污水处理技术的具体进展情况。     

人工湿地处理生活小区污水可行性分析

目前人工湿地处理城市生活污水特别是生活小区污水处理倍受关注.本文阐述了人工湿地的含义、类型及净化机理,并对人工湿地应用于小区污水处理进行了详细的可行性分析     

一种通过液位仪精确计量水位及循环以治理水质的设计

以一个现有人工景观湖的治理为实例,为了使湖水水质得到净化,设计了直流人工湿地与水循环并用的方法来净化水质。一方面通过液位仪精确计量、控制新水补充量和旧水排出量;另一方面在湖边设置直流人工湿地对水质进行循环净化处理。这样既达到了对湖水进行循环净化的目的,同时也将富含各种微生物的水体进行了灌溉处理,维持了水系净化的可持续性。此系统的完成,对以后的改造具有借鉴意义。     

人工湿地系统处理废水工艺及案例介绍

利用低能耗的人工湿地系统处理废水在国内外得到了广泛应用。本文介绍了人工湿地系统的构造、工艺类型及净化机理，并以成都市活水公园为例，着重介绍了人工湿地系统的工艺流程。     

人工湿地生态修复技术标准研究

人工湿地系统规划是当前河道治理及生态维护方面较为可行的有效途径。面对当前不断推进的城市化进程来说,很多河流的治理也是需要在大力搞经济建设的情况下,重点考虑其规划的环保性和生态平衡原则。人工湿地中对应水污染措施的实施,不仅能够有效的净化水质,还能够提升生态环境的健康性,更突出了低碳环保的社会发展理念。本文结合人工湿地工程的具体实施标准,对湿地工程实施中的常见问题进行了探讨和措施提出,同时最后给出了人工湿地建成后的一些养护建议,以供参考。     

A2／O工艺生物脱氮影响因素试验研究

实验对A2／O工艺处理生活污水中氮污染的影响因素进行了研究,主要考察了HRT（好氧区）、DO（好氧区）、混合液和污泥回流比、温度等因素对生物脱氮的影响。结果表明,对于城市生活污水而言,当好氧区水力停留时间为5h、DO为3mg／L、混合液回流比为300％、污泥回流比为100％时,A2／0工艺能获得较好的脱氮效果。     

浅谈人工湿地污水处理技术

本文首先对人工湿地的概念及分类进行简要的介绍,然后分析了人工湿地对有机物、氮磷、悬浮物和重金属的去除机理。最后阐明了人工湿地污水处理技术的优缺点,并对我国人工湿地的研究与应用进行了展望。     

巨野县人工湿地水质净化工程治理措施

本文分析了巨野县人工湿地水质净化工程的基本情况,污染状况,水质净化工程治理方案,有针对性地提出改善区域生态环境的对策。     

人工湿地植物景观浅析

人工湿地近年来越来越受关注,但是从园林景观方面探寻人工湿地植物景观的研究却相对较少。在人工湿地定义的基础之上,从园林设计角度来探讨人工湿地植物景观,同时浅议人工湿地植物景观的系列设计要点,包括人工湿地植物的筛选原则、人工湿地植物景观的造景原则以及人工湿地植物的群落构成三方面,试图以此来探寻一种用以营造生态的、优美的人工湿地植物景观的园林理论。     

基于A/O-MBR工艺的黑水处理试验研究

针对A/O工艺（厌氧好氧工艺）处理黑水结果不达标的问题,将A/O工艺与MBR工艺（膜生物反应器）进行组合,形成了A/O-MBR工艺（厌氧好氧-膜生物反应器组合工艺）,为了明确A/O-MBR工艺对黑水中主要污染物的去除效果以及运行时的控制模式,搭建了全尺寸试验系统并进行了黑水处理试验。结果表明：在间歇曝气以及间歇回流的运行模式下,A/O-MBR工艺对黑水中的COD、NH3-N、TN去除率都达到了90%以上,对悬浮物以及粪大肠菌群的去除率都达到了99%以上,都达到了一级A标准;但出水TP的去除率为76%,仍需辅以化学处理。间歇曝气以及间歇回流的A/O-MBR工艺可以有效提高黑水中污染物的去除率,适合用于处理黑水。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.