赤峰市红庙子污水处理二期扩建工程初步设计

赤峰市红庙子污水处理二期扩建工程,结合赤峰市红庙子污水处理工程待处理水质特点,对原厂一期出水数据、运行情况的系统分析,二期扩建中本项目污水处理工艺为“百乐克污水处理工艺”,为使出水达到一级A标准,对污水厂二级生化处理的出水进行深度处理,深度处理工艺选择：混凝沉淀+纤维转盘滤池。本工程扩建规模为2.5万m³/d污水处理厂,出水执行《城镇污水处理厂污染物排放标准》(GB18918—2002)一级A标准。     

一种线路板废水处理工艺

环保对线路板废水排放提出了越来越严格的要求。针对线路板废水不能稳定达标排放的问题,本设计就各种工艺的特点、经济性等多方面进行了比较,结合本设计废水特点,选择预处理+深度处理工艺对废水进行处理。预处理采用酸化、混凝沉淀等工艺,深度处理采用Fenton氧化+曝气生物滤池组合工艺,进一步降解COD、铜。通过处理,该厂废水将能达到《电镀水污染物排放标准》排放标准。     

“高效沉淀池+连续流砂滤池”组合工艺用于污水厂深度处理的设计研究

污水厂深度处理采用高效沉淀池+连续流砂滤池处理的组合工艺,可使尾水水质由《城镇污水处理厂污染物排放标准》(GB10918-2002)一级B标准提升至一级A标准及广东省地方标准《水污染物排放限值》(DB44/26-2001)的较严值。运行结果表明：该深度处理工艺效果良好、运行稳定。本文主要介绍了设计思路、设计参数、运行效果等。     

AAO+高效沉淀池+滤布滤池工艺在污水处理厂提标中的应用

江西某南部城市生活污水处理厂一期工程处理规模为1.0万m³/d,污水采用曝气生物流化池(ABFT)生物膜处理工艺，出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级B标准。提标改造后，处理规模不变，污水处理工艺采用改良型厌氧-缺氧-好氧(AAO)+高效沉淀池+纤维转盘滤池处理工艺，出水水质执行上述标准一级A排放标准。提标改造中分析了一期工程运行现状及存在问题，强化了生物脱氮，并增加了高效沉淀池及纤维滤布滤池深度处理工艺，出水稳定达标。该工程建设用地指标低，投资少，周期短，取得了较好的社会和经济效益，为类似污水处理厂提标改造提供参考和借鉴。     

合肥市肥西县老城区初期雨水处理厂工艺设计方案

径流面源污染已成为水环境的主要污染源之一,亟待针对性工程措施治理。以合肥市肥西县老城区初期雨水治理工程为例,介绍针对分流制初期雨水的处理厂工艺方案设计。处理厂采取"预处理+生物处理+深度处理"的工艺流程,核心生物处理工艺采用曝气生物滤池,深度处理工艺采取"加砂高速沉淀池+滤布滤池"的组合工艺,确保出水稳定达标。出水经消毒后排放至潭冲河作为补水水源。工程建成后将大大改善潭冲河及派河水环境质量,提升地区的投资环境,为国内其他类似工程提供工艺设计思路与参考。     

某经济开发区污水处理厂工程设计案例分析

以湘西某经济开发区新建污水厂为例,介绍了该工程工艺流程、设计参数及设计特点。分析了工程运行过程中实际进出水水质情况。其污水处理工艺为"预处理+水解酸化池+AAO+二沉池+高密度沉淀池+生物炭滤池+紫外消毒",污水经处理后主要指标COD、BOD_5、SS、NH_3-N、TN、TP等可稳定达到《生活污水处理排放标准》(GB 19818—2002)一级A标准;污泥处理工艺采用"污泥浓缩+污泥调理+高压隔膜板框",污泥含水率压至50%以下后填埋。污水厂投资为3 576.7元/m~3,运行费用为0.434元/m~3。     

某制药废水处理改造工程实例

随着产品种类的多样化与产品产量的提升,连云港某制药公司原有污水处理工艺设施已无法满足处理要求,经过改造,形成水解酸化+IC+好氧为主体,以MBR为深度处理的处理工艺,最终出水达到《污水排入城镇下水道水质标准》。     

老净水厂提标改造处理工艺探讨

某老净水厂原工艺设计执行《室外给水设计规范》(GBJ 13-86),设计出水水质执行《生活饮用水卫生标准》(GB5749-85)。改造工程在原厂区内进行,无新增用地。本次改造为达到设计要求,降低工程规模,改造现状构筑物主要包括斜管沉淀池、双阀滤池、虹吸滤池、配水泵房;增加深度处理工艺、排泥水处理系统、污泥处理系统,工艺改造后设计出水水质满足《生活饮用水卫生标准》(GB5749-2006)。     

PACT工艺在福建省某污水处理厂提标改造工程中的应用

文中以福建省某污水处理厂提标至一级A标准为例,对项目背景、设计方案、主要构筑物设计参数、运行效果和成本分析等进行介绍。针对目前二沉池沉降性能差、现有氧化沟工艺生物处理效果不佳等问题,将原有的“水解酸化+改良型Carrousel氧化沟+滤布滤池”工艺改造为可投加粉末活性炭的生物活性炭法(PACT)工艺,并增加“高效沉淀池+V型滤池+滤布滤池”深度处理工艺。正式投入运行之后,在2020年对污水处理厂出水进行了为期一年的水质检测,结果表明提标后的污水处理厂出水各项指标均达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A排放标准,且很好地解决了原有工艺的处理问题。     

一体化模块设计在小型污水处理厂中的应用——以新密市某污水处理厂为例

中国城镇化发展不断加速,乡镇污水的集中收集与处理问题愈益突出,探索小型污水处理厂的一体化模块设计,实现标准化建设是一种有效的解决办法。新密市某1.0万m3/d污水处理厂,污水处理工艺采用"粗格栅+细格栅+平流沉砂池+Unitank反应池+机械混凝折板絮凝平流沉淀池+滤布滤池+NaClO消毒"工艺,出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。设计中采用污水预处理、二级处理、深度处理和污泥处理、除臭等构(建)筑物的高度集约化设计,文中介绍了该工程的主要工艺流程和重点工艺设计。     

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。