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1.
文章从农村生活污水处理的角度入手,以小型垂直流人工湿地处理技术作为着眼点,分析了小型垂直流人工湿地处理系统的基本结构,研究了该系统处理农村生活污水的效果与价值,望引起各方关注。  相似文献   

2.
郑晓坚 《价值工程》2023,(36):151-153
为了高效深度处理污水处理厂排放的尾水,宁夏永宁县采用潜流人工湿地+表面流人工湿地技术处理永宁县第二污水处理厂的尾水,经过人工湿地深度处理后,人工湿地出水水质达到地表水Ⅳ类标准排放,对于永二干沟环境综合整治、生态环境保护和流域社会经济可持续发展,具有切实的必要性和重要的战略意义。经过实践表明:人工湿地技术可以高效地处理污水厂尾水,同时具有明显的生态环境效益、经济效益和社会效益。  相似文献   

3.
文章介绍了人工湿地的发展现状,对人工湿地及其对不同污染物的污水处理原理进行了阐述,针对人工湿地污染物处理系统及其设计的关键因素进行了具体的说明,并结合人工湿地系统在各个领域的广泛应用,介绍了其污水处理方法及流程。  相似文献   

4.
随着人们的生产和生活水平提高,向环境中排放的废水越来越多,处理废水成了环保工作者的一大难题。而人工湿地处理废水系统无疑是一种很好的选择。重要综述了人工湿地的分类,人工湿地对污染物的去除机制及去除效果。  相似文献   

5.
以上海市宝山区张墅村处理农村生活的人工湿地系统为研究对象,对其进行周年的采样监测,从而评价人工湿地的处理效能。研究表明,污染物在人工湿地的去除过程中,为吸热过程,出水的温度要明显低于进水的温度,同时发现,湿地的出水的pH值亦远小于湿地进水的pH值。湿地的出水溶解氧均值〉2mg/L,说明湿地由还原反应逐渐过渡至氧化反应。湿地对CODcr的去除效率为68.44%,CODMn的平均除去率为61.44%,BOD5的去除率为68.78%。NH3-N的去除率高达92.2%。TP的去除率仅为31.64%。TP去除率可以通过在湿地内增加Ca、Fe或铝含量较高的填料予以提高。除TP外,人工湿地对污水的各污染指标均有较好的去除效率,且人工湿地低投资、低能耗及低管理,说明人工湿地是处理农村生活污水的行之有效的技术。  相似文献   

6.
人工湿地基于物理化学和生物对有机物、氮磷等吸附降解来模拟天然湿地的植物理化环境结构,人为设计具有一定配料比来处理污水。文章从我国小城镇污水特点出发,分析了目前小城镇污水处理现状,并对人工湿地系统的特点优势进行分析,最终通过试验得出人工湿地系统对小城镇污水具有良好的去污效果。  相似文献   

7.
文章分析了农村生活污水的特点、形成原因以及现有的农村污水处理技术,并阐述了人工湿地系统的组成及其去污原理,结合农村生活环境的现状,因地制宜地分析了人工湿地技术在处理农村污水中的应用。  相似文献   

8.
郭文方 《价值工程》2014,(11):319-320
本文阐述了人工湿地处理技术的原理、优点和存在的问题,在此基础上,结合实际案例研究了新型曝气人工湿地处理技术,从而改善和解决了传统人工湿地处理技术存在的问题,提供了尾水提标改造思路和工程中的具体做法,可供其它地区在实践中参考。  相似文献   

9.
人工湿地作为一种新型污水处理技术,具有能耗低、处理高效的特点。文章介绍了人工湿地的概念、类型,同时分析了人工湿地净化污水的机理,并对人工湿地技术在农村污水处理中的应用进行了具体阐述。  相似文献   

10.
由于人口数量不断增长,城市用于污水处理的成本越来越高,这就要求城市污水治理部门拿出新的污水解决方案,加强对污水的回用。本文就人工湿地污水处理系统、工作原理,人工湿地处理污水的流程,在城镇污水治理中的应用等多个方面对这一方案做了分析。  相似文献   

11.
This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.  相似文献   

12.
Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.  相似文献   

13.
Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.  相似文献   

14.
NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.  相似文献   

15.
There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.  相似文献   

16.
A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.  相似文献   

17.
We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.  相似文献   

18.
杨明 《价值工程》2012,31(7):16-17
物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。  相似文献   

19.
丛广英  乔炜君 《价值工程》2010,29(6):245-245
大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。  相似文献   

20.
This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.  相似文献   

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