乳饮料废水A/O处理工艺设计探讨

针对乳饮料废水水量大、水质不均匀、pH值波动大等特点,介绍了物化-A/O处理工艺的设计,对各处理构筑物的设置要求、参数选用、设备选型、附件安装等方面提出了一些建议。提出要注重事故池、中和池的设计;建议气浮采用平流式加压溶气形式;二沉池不建议选用斜管沉淀池;对填料支架的做法应建立相应标准和规范;对物化污泥和剩余污泥,可通过设置框式搅拌机先行混合,再进行压滤。     

草甘膦农药废水处理工程改造设计

结合某公司草甘膦农药废水排放的实际情况,充分利用现有构筑物进行工艺改造设计,将难生化废水与可生化废水分开进行多级氧化或混凝预处理,再将废水混合进行综合处理,采用Fenton氧化与生化处理结合工艺流程处理草甘膦农药废水,介绍了主要构筑物及其工艺参数。研究结果表明,经该工艺处理后出水能够达到GB 8978—1996《污水综合排放标准》的要求。     

某助剂厂废水处理站提标改造实例

针对助剂厂生产废水原有处理工艺中缺少有效预处理工艺,及生化池处理负荷过低等问题,在充分利用原有处理设施的基础上,结合GB 18918—2012《城镇污水处理厂污染物排放标准》一级A标准的出水要求,对原处理工艺进行升级改造,完善预处理、强化生化处理、增加深度处理。介绍了该工程的背景、原有工艺及问题、改造措施及特点、新增构筑物设计参数。     

生活污水处理及回用工程

采用由预处理系统、生物处理系统、深度处理系统、污泥处理系统组成的污水处理系统组合单元处理污水,工艺方案合理,可生化性好,运行操作方便,无刺激气味气体逸出,处理后的水质能达到设计使用要求。     

两级EGSB+AO+Fenton组合工艺深度处理农药废水

江苏某农药化工厂生产废水成分复杂,各生产段废水污染程度各异。新建废水处理站设计规模为460 m3/d,设计方案选用"预处理+生化处理+深度处理"组合工艺对该废水进行处理。其中,预处理采用"MVR蒸发器+氨氮分离膜+溶气气浮+Fenton氧化+混凝沉淀"组合工艺;生化处理采用"两级膨胀颗粒污泥床(EGSB)反应器+缺氧池+好氧池"组合工艺;深度处理采用"Fenton氧化+多介质过滤器"组合工艺。工程实际运行结果表明,出水CODCr60 mg/L,氨氮5 mg/L,TP 0. 1mg/L,各项水质指标均达到《污水综合排放标准》(GB 8978—1996)中一级排放标准的要求。该处理系统运行稳定,抗冲击负荷能力强。     

国内外水处理技术信息

<正>中药废水处理系统及工艺——冯祥茂.CN 201410103450本发明公开一种中药废水处理系统及工艺,属于制药废水处理技术领域。该系统包括:预处理系统、生化处理系统、深度处理系统和污泥处理系统,生化处理系统为核心处理系统,包括水解酸化池和SBR池,其中SBR池采用间歇式运     

废水处理———：第十篇 废水的物理处理法（一）———沉淀法

沉淀是水处理中最基本的方法之一。它是利用水中悬浮颗粒的可沉淀性能,在重力的作用下产生下沉作用,以达到固液分离的一种过程。常用于废水的预处理工序、生物处理构筑物之前的初次沉淀、生物处理后的二次沉淀以及污泥处理阶段的污泥浓缩等工艺中。     

大庆市东城区第二污水处理厂工艺设计

大庆市东城区第二污水处理厂采用改良A2/O+高密度沉淀池+反硝化深床滤池+二氧化氯消毒的污水处理工艺;污泥处理采用机械浓缩+离心脱水机进行脱水;对一级处理单元及污泥处理单元产生的臭气采用生物除臭工艺进行处理;介绍了本工程的工程概况、进出水水质、构筑物的设计参数。     

某印染工业园区废水处理工程实例

针对某印染工业园区废水可生化性差、盐分高、氯离子浓度高的特点,采用预处理-水解-AO生化处理-芬顿高级氧化-中和脱气-絮凝沉淀-砂滤-消毒组合工艺,处理后出水可稳定达到GB 18918—2002《城镇污水处理厂排放标准》一级A标准。介绍了废水的水质特征、处理工艺、主要处理构筑物及设计参数、工程运行效果。     

集成技术处理光伏行业生产废水工程实例

以某光伏企业为例,分析了废水产生来源及水质特点,按照分类收集—分质预处理—集中生化处理的处理思路,选择钙盐沉淀法+高密度沉淀池处理含氟废水;预调节沉淀池+板框压滤机处理颗粒废水;水解酸化+生物接触氧化+活性砂过滤处理综合废水。介绍了该工艺的技术特点,并给出主要构筑物的技术参数,阐述工艺控制要点及系统运行情况,分析运行效果,供其他工程参考。工程监测结果表明,该工艺可有效去除水中污染物,处理系统运行稳定,耐冲击能力强。     

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。