抽气预处理法测定氰化物

作为水质全分析中的一项毒性含量指标,水中氰化物的测定是衡量水体中生物生存、人类饮用用水、工业生产用水安全的重要参数.但其含量监测方法水样预处理步骤繁琐、费时.论文提出用抽气预处理法测定氰化物,并通过对比试验证明,抽气法预处理法操作简便、省时、能耗小;通过在抽气过程中将整个装置处于常温负压条件下,基本解决了HCN外选、瓶爆裂等问题.论文除了对抽气法预处理一些操作条件进行了摸索并确定了最佳操作条件外还着重探计了抽气法对复杂水体,如地表水、工厂处理后废水的适用性.     

生物陶粒滤池预处理官厅水库水的试验研究

针对官厅水库下游三家店水库水源水进行生物陶粒滤池预处理的现场试验研究。试验结果表明:在气水比为1∶1,滤速6m/h,水温高于5℃的运行条件下,生物陶粒滤池工艺对水中高锰酸盐指数的去除率为10%～18%,氨氮的去除率为80%～98%,出水浊度降低到2NTU以下;气水比为1∶1,滤速4m/h,水温0℃～4℃的情况下,高锰酸盐指数的去除率为5%～12%,氨氮的去除率为65%～80%,出水浊度降低到3NTU以下。     

生物接触氧化预处理技术处理微污染源水研究

饮用水水源污染的日益严重,对人类健康构成巨大威胁,给传统净水工艺提出了新的挑战.本文从目前我国水资源污染现状出发,概述了生物接触氧化法净化水质的原理、水质处理效果、主要影响因素、并结合了国内外应用情况讨论其优势和局限性.并对生物预处理技术进行了展望.     

生物过滤技术在大气污染控制中的应用前景

对近年国内外生物过滤技术（生物滤器、生物滴滤器）处理废气的使用范围、操作的基本原理和目前的应用情况作了综述，并且预测了今后的发展方向。     

应用于膜分离的预处理技术研究进展与展望

综述了当前在膜分离技术处理废水中使用的几种预处理技术的基本原理及其应用。这些技术对于提高膜分离技术对废水中各种污染物的去除能力以及减缓膜通量的降低都具有一定作用,而几种技术的组合则有利于膜分离性能的进一步提升。     

Solving multidimensional bioeconomic problems with singular-perturbation reduction methods: Application to managing pest resistance to pesticidal crops

We investigate the application of ‘singular-perturbation’ reduction methods from the dynamical-systems literature to solve continuous-time multidimensional bioeconomic models resulting from integrating economics with increasingly complex biological structures. These methods reduce multidimensional solution space to the lower-dimensional subspace confining long-term dynamics. They arise naturally in problems with state variables evolving on widely disparate time scales. In particular, we demonstrate how the methods reduce the solution space of a linear-control specification—characterized by two state variables adjusting at widely disparate rates—to a single differential equation in the slow variable. All other system variables are determined by algebraic equations. We apply singular-perturbation methods to investigate the optimal management of pest resistance to pesticidal crops. The pest population evolves on a fast-time scale, while the population's genetic composition evolves on a slow-time scale. In comparison with past work, we can more fully characterize the continuous-time dynamics associated with a complex genetic specification.     

Fe—C微电解法＋H2O2组合工艺处理对氯硝基苯废水

利用废铁屑对对氯硝基苯废水进行预处理 ,可以使废水中的对氯硝基苯转化为氨基氯苯 ,然后在废水中加入H2 O2 ,使H2 O2 与废水中的Fe2 + 构成Fenton试剂 ,反应生产OH·自由基 ,OH·自由基具有强烈的氧化性 ,将氨基氯苯和对氯硝基苯中的苯环打开 ,形成断链 ,再进一步将其矿化分解     

碱熔－蒸馏－离子选择电极法测定废钻井液中全氟

废钻井液是油气勘探开发的废弃物，目前多采用就地掩埋方式处置。准确测定废钻井液中氟化物的含量，对于评价其对环境可能造成的影响是十分必要的。选用离子选择电极法测定废钻井液中的氟时，对预处理方法进行了试验研究：试验了蒸馏－离子选择电极法、碱熔－离子选择电极法、碱熔－蒸馏－离子选择电极法。结论是：碱熔－蒸馏预处理法综合了碱熔法和蒸馏法各自的优点，能将氟从钻井液中最大程度地蒸馏出来，消除了基体对氟测定的干扰。因此，此法以回收率表示的废钻井液全氟准确度为最高并达到了文献要求，方法可靠。     

场地液化危害的概率分析

为使场地液化危害程度的估计建立在以概率论为基础的可靠性分析之上,本文提出二种估计场地液化危害程度的概率方法,二种方法分别采用不同的途径处理地震和岩土的不确定性,不仅分析了一点液化的概率,而且提供了估计整个土层住状液化概率的方法,文中最后通过算例简要讨论了液化概率分析结果的工程应用。     

Water quality standards: Everglades National Park

Water quality criteria were developed for delivery waters to Everglades National Park. The park receives a minimum of 12.34 m³/sec (315,000 acre-ft/yr) of water from controlled sources external to its boundary. These waters often originate from areas that are or potentially are impacted from urban and agricultural developments. When, in 1970, the U.S. Congress guaranteed minimum water deliveries to Everglades National Park, it also required that these waters be of good quality.The Everglades National Park water quality data base was analyzed from 1970 to 1978 at both in-park and water delivery sites to determine the current level of delivery water quality and to select representative delivery sites. It was found that current delivery water quality was sufficiently high to be adopted as criteria against which future water quality could be compared. From the delivery sites S-12C and L-67A all data were combined from 1970–1978 for 36 parameters including macronutrients, heavy metals, and field parameters such as DO, pH, and specific conductance. Mean concentrations and upper limits were computed and tabulated for comparison during future monitoring programs. These criteria were subsequently adopted through a joint memorandum of agreement between the U.S. Army Corps of Engineers, South Florida Water Management District and the U.S. National Park Service.