Fenton/生物接触氧化工艺处理印染废水

根据现有印染废水处理工艺,采用Fenton/生物接触氧化工艺处理其沉淀池出水。Fenton氧化在pH值4、Fe2+/H2O2(质量比)值2.5、Fe2+投加量300mg/L、反应时间50min;生物接触氧化在HRT 6h的工艺条件下,COD去除率达到87.1%;色度去除率达到90.0%,实验出水达到《辽宁省污水综合排放标准》(DB21/1627-2008)。     

混凝沉淀-生物接触氧化处理制革废水

以河北某制革厂污水处理站为例,通过分析制革废水的特点,采用混凝沉淀-生物接触氧化工艺路线处理制革生产综合废水。该法对废水COD和BOD的去除率可达93%以上,且废水的脱色效果良好,处理后的水质达到了GB 8978—1996《污水综合排放标准》中的Ⅱ级标准。     

两级絮凝沉淀-炉渣吸附工艺处理印染废水

采用两级絮凝沉淀 -炉渣吸附工艺处理印染废水 ,处理后 ρ(出水 COD)为 90～1 40 mg/ L,水质无色透明 ,符合 GB42 87-92《纺织染整工业水污染物排放标准》中 级标准。     

直接耐晒黑G染料废水处理研究

采用酸化+铁碳微电解+芬顿氧化的工艺处理了直接耐晒黑G染料废水,其中,硫酸用量为3%,铁碳微电解进水pH为3,曝气时间为1h,芬顿氧化双氧水用量为4%,在此工艺下,其出水基本无色澄清,COD去除率达到95%以上,出水COD低于500mg/L,可直接排放至化工园区污水站管网。其每吨废水处理成本约115元,具有非常可观的经济性。     

物化预处理-生化法处理冷轧废水室内试验研究

采用破乳/过滤/臭氧氧化/生化组合工艺对平整液废水进行处理,结果表明:酸化破乳/过滤可以有效去除平整液废水中的COD,对COD的去除率可达50％;臭氧可以去除一部分溶解性有机物,并且可生化性提高;驯化后的活性污泥对臭氧曝气后的出水有较好的处理效果,48h后出水CODcr为555mg/L.     

300t/d水产品加工废水处理研究

天津某水产品加工排放的生产废水COD 1000～8000mg/L;氨氮60～240mg/L;pH 7～8,采用UASB+接触氧化法+MBR法系统处理水产品加工废水,能够有效去除水产加工废水中的COD、NH3-N以及TP。各项污染物出水浓度均满足《污水综合排放标准》GB 8978-1996的标准以及《城镇污水处理厂污染物排放标准》GD18918-2002中的一级B排放标准。     

曝气生物滤池深度处理印染废水的实验研究

采用曝气生物滤池(BAF)对经生化预处理后的印染废水进行中试规模的深度处理实验研究,考察了水力负荷、进水有机负荷和滤层高度对污水化学需氧量(COD)和总磷(TP)的去除效果。结果表明:当BAF进水水力负荷为2.5 m3/(m2·h),气水比为2∶1,进水COD和TP质量浓度分别为77.7~102 mg/L和0.872~0.957 mg/L范围变化时,COD和TP平均去除率分别达到了47.9%和46.0%,出水水质满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。     

混凝沉淀-水解酸化／曝气池-曝气生物滤池-活性砂滤工艺处理印染废水的设计与运行

为保护下游白洋淀地表水及地下水的水质,以高阳县印染废水为处理对象,对高阳污水处理厂的工艺和运行参数进行了优化和调试。采用混凝沉淀-水解酸化/曝气池-曝气生物滤池-活性砂滤为处理工艺,设计处理规模为12万m3/d,当进水的COD,SS,NH3-N和TP的质量浓度分别为669,424,8.83和6.03mg/L时,经该工艺处理后其最佳去除率分别为93.5%,98.8%,97.1%和96.2%,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准,其运行成本仅为0.807元/m3。工程的建设和运营不仅改善了周围环境,而且促进了区域经济发展,工艺的设计和运行参数为印染废水处理行业提供了重要参考。     

复合絮凝剂与活性砂滤池协同深度处理印染废水研究及应用

采用复合絮凝剂和活性砂滤池协同处理印染废水,研究了复合絮凝剂对浊度、COD(化学需氧量)和TP(总磷)的去除性能,在实际运行系统中考察了复合絮凝剂和活性砂滤池协同处理后的出水水质情况。结果表明:活性砂滤池在平均处理水量为3 500 m3/h情况下,当复合絮凝剂投加量为ρ(PAC)=50 mg/L,ρ(FeCl3)=10.0 mg/L,ρ(APAM)=1.0 mg/L时,出水水质指标浊度、COD和TP的平均去除率分别达到了56.6%,45.3%,59.4%,出水水质各项指标均达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准。     

接触氧化工艺处理印染废水

随着印染工业的发展和大量化纤产品出现,新的化学浆料、染化料和整理剂等的应用,使印染废水的成分发生了变化,处理难度加大,单纯的好氧生物处理方法的出水COD、色度难以达标,生物法与化学法组合的水解酸化—接触氧化—混凝工艺可解决这个问题。     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

快速成形技术的应用及热点分析

基于快速成形技术的原理,展示了快速成形技术在快速模具制造、金属零件直接成形、反求工程等领域的广泛应用,总结了快速成形制造技术研究的热点,即研发新材料和新设备、提高成形精度、建立RPM的反求工程系统、建立成形技术的统一标准和扩大成形技术的应用领域。     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

Diffusion and usage of public e-services in Europe: An assessment of country level indicators and drivers

We analyze the state of the art of indicators on e-government, e-health, e-procurement and e-participation. We survey the main methodological properties of these indicators, and highlight their heuristic potential. Further, we address empirically the issue of the explanation of the availability scores, i.e. how the supply of the various e-services in each country is affected by political, institutional and socio-economic differences, and is followed by actual usage. The econometric analysis uncovers the importance of broadband penetration and higher education as drivers for most of the types of e-services and users (citizens and businesses). Moreover, a corruption-free and agile public sector proves to be an important pre-condition for more effective supply and usage. Despite data limitations and the complexity of the underlying diffusion phenomena, our study is the first truly longitudinal contribution aimed at disentangling the common drivers of such an important phenomenon – the e-services availability and usage across European countries. As such, this work appears useful to inform the policy debate and practice, in a phase characterized by a prospective reorientation of the public e-services provision and policy agenda.     

一种高精度的频率标准比对系统

频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

HSE走进中国石油

企业管理水平的好坏直接影响着企业的经济效益,运用HSE管理能提高企业管理水平,HSE管理模式将健康,安全,环境三者视为一个有机的整体。HSE管理认为人的安全是第一位的,人是创造财富的原动力,是企业的最大财产,HSE管理体系强调的是“蝴蝶效应”。