曝气生物滤池(BAF)的研究进展

介绍了曝气生物滤池的工艺原理、结构形式、常用设计参数以及影响曝气生物滤池处理效果的因素,指出曝气生物滤池作为一种污水处理的新工艺应在国内广泛应用。     

曝气生物滤池技术的研究进展

综述了曝气生物滤池污水处理技术在填料、运行工艺、微生物相等方面的最新研究进展,展望了曝气生物滤池今后的研究方向。     

曝气生物滤池技术的应用与发展

作为一种高效的生物膜污水处理工艺，曝气生物滤池日益受到水处理专家的关注。本文详细介绍了曝气生物滤池的发展应用现状，结构形式、工艺特点以及工作原理，并提出了曝气生物滤池今后的研究方向。     

间歇曝气牛物滤池生物脱氮工艺研究

通过研究,结合SBR工艺与曝气生物滤池工艺优点,得出间歇曝气生物滤池生物脱氮的运行参数,实现强化生物脱氮功能和节省运行费用的污水处理工艺。     

间歇曝气生物滤池生物脱氮工艺研究

通过研究,结合SBR工艺与曝气生物滤池工艺优点,得出间歇曝气生物滤池生物脱氮的运行参数,实现强化生物脱氮功能和节省运行费用的污水处理工艺。     

曝气生物滤池及组合工艺在水处理中的应用发展

曝气生物滤池(BAF)是一种将生物接触氧化与过滤机理相结合的污水处理技术。文章介绍了该工艺的基本原理及应用,总结出针对不同处理要求及废水水质常用的几种曝气生物滤池组合工艺,如O_3-BAF,A_2O-BAF等,为今后BAF在水处理中的应用提供参考。     

曝气生物滤池运行情况调研及问题分析

对曝气生物滤池在城镇污水处理中的应用情况进行了调研,总结了曝气生物滤池对不同污染物的处理能力,针对性地对其预处理系统、曝气系统、滤池间配水系统存在的问题进行了分析,并提出了改进措施.     

曝气生物滤池在电厂生活污水处理中的应用实例

曝气生物滤池技术是近几年被广泛应用的一种新技术。随着对污水回用处理和自动化程度要求的提高,曝气生物滤池以其固有的优势越来越受到污水处理同行的重视。本文简要介绍了曝气生物滤池技术在电厂生活污水处理中应用的实例,并给出了相关的主要技术参数,为曝气生物滤池技术得到更为广泛的应用提供参考。     

BAF组合工艺在炼油废水处理中的研究与应用

曝气生物滤池（Biological Aerated filter）是近年来发展较快的污水处理技术。本文对近年来对BAF组合工艺在炼油废水处理中的研究做了一个简单概括和总结。研究表明曝气生物滤池在处理含油炼化废水时,对COD、SS、N、石油等有较高的去除率。     

曝气生物滤池脱氮的研究进展

介绍了曝气生物滤池的种类、脱氮的原理以及在工业废水和生活污水处理方面的实际应用,总结了曝气生物滤池脱氮影响因素方面的国内外研究成果,其中影响因素包括气水比、水力负荷、HRT、C/N、反冲洗、pH和滤料等。本文还综合考虑了成本和处理效果等问题,给出了各个影响因素的适宜范围。此外,本文还指出了曝气生物滤池技术目前在脱氮方面所存在的两个关键性问题——反硝化碳源不足和缺氧区域形成受限等问题,并提出了能够解决这两个问题的3种改良工艺——释碳材料、异养硝化好氧反硝化脱氮和曝气生物滤池组合工艺等,同时还介绍了这3种工艺在曝气生物滤池脱氮方面的研究成果、具有的优势以及目前存在的主要问题。此外,还对曝气生物滤池技术在脱氮方面的前景进行了展望。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。