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采用混凝-Fenton法处理盘锦油田含油废水,分析PAC用量、PAM用量、pH值、H_2O_2的投加量、FeSO_4·7H2O的投加量、反应温度和反应时间等各因素对COD_(Cr)去除效果的影响,并确定最佳的处理条件。结果表明,混凝试验中PAC的投加量为200 mg/L和PAM的投加量为0.6 mg/L时效果最好;Fenton反应的最佳条件为:pH值为4,H_2O_2投加量为37.8 mmol/L,FeSO_4·7H_2O投加量为3.78 mmol/L,反应温度为75℃,时间为30 min,此时Fenton反应进行最彻底,含油废水COD_(Cr)去除率最高。 相似文献
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以实际印染废水排放口的出水为研究对象,考察了微波辅助Fenton试剂氧化法深度处理印染废水的效果和影响因素。结果表明,微波辅助Fenton试剂氧化法对印染废水具有良好的深度处理效果,在进水COD_(Cr)为150~160 mg/L的条件下,处理出水COD_(Cr)小于60 mg/L,达到《污水综合排放标准》(GB 8978-1996)的一级标准。在试验条件下,最佳的反应参数为:初始pH为2.5,FeSO_4·7H_2O投加量为4.4 g/L,30%H_2O_2投加量为8 g/L,微波功率为500 W,微波反应时间为5 min。微波辅助Fenton试剂氧化法的COD_(Cr)去除率可达65.1%。 相似文献
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研究了Fenton试剂处理机械加工清洗废水的影响因素及其适宜操作条件。实验结果确定的适宜操作条件为:在原水COD_(Cr)约2 000 mg/L时,n_(H_2O_2)/n_(Fe~(2+))=37.6,H_2O_2的投加量40 mL/L,pH=4,反应时间2.5 h,此时COD_(Cr)的去除率可达91.4%。同时考察了聚丙烯酰胺与Fenton试剂的协同效果。适宜操作条件下COD_(Cr)的去除率可达93.2%。 相似文献
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采用Fenton氧化对垃圾渗滤液进行预处理研究。结果表明:COD_(Cr)的去除率随H_2O_2投加量的提高,先升高后下降;随FeSO_4投加量的提高,先升高后趋于平缓;随反应时间的延长,趋于平缓;随pH值的升高,先升高后下降。TN的去除率与投药的比例和反应条件关系不大,主要是氨氮的去除,始终保持在17%~30%。在COD_(Cr)质量浓度为2 500~3 000 mg/L、总氮质量浓度为950~1 400 mg/L时,最佳H_2O_2投加量为6 mL/L,FeSO_4投加量为2.5 g/L,最佳反应时间为30 min,反应pH值为4,COD_(Cr)去除率可达69.53%,总氮去除率可达22%,色度去除率可达98.33%,B/C由0.15提高至0.23。Fenton氧化作为垃圾渗滤液的预处理具有较高可行性的。 相似文献
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研究了采用Fenton法对难以生物降解处理的松香加工废水进行预处理的方法及影响因素。结果表明,最佳运行条件为初始pH=3,n(H_2O_2)/n(Fe~(2+))=3︰1,m(H_2O_2)/m(COD_(cr))=10︰1,反应时间30 min。经Fenton法处理后,当pH=3,V(H_2O_2)=0.90 mL,m(FeSO_4·7H_2O)=0.8181 g,出水CODcr为20.5 mg/L,COD_(cr)去除率达到94.86%,Fenton法是深度处理松香加工废水的一种有效工艺,同时表明Fenton试剂对松香加工废水中的有机物有明显的降解作。 相似文献
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《应用化工》2022,(9):2440-2443
采用Fenton氧化法对橡胶硫化促进剂生产废水进行预处理,考察了酸析法以及H_2O_2投加量、Fe(2+)投加量、pH值、反应时间对Fenton氧化法COD去除率的影响。结果表明,Fenton氧化法处理该废水的最佳反应条件为:pH值为3,H_2O_2投加量为55 mL/L,Fe(2+)投加量、pH值、反应时间对Fenton氧化法COD去除率的影响。结果表明,Fenton氧化法处理该废水的最佳反应条件为:pH值为3,H_2O_2投加量为55 mL/L,Fe(2+)投加量为2.8 g/L,反应时间为40 min。此时COD的去除率达82.91%。将酸析与Fenton氧化法联合后COD的去除率可达到85.78%,效果良好,为后续蒸发结晶分离氯化钠、硫酸钠奠定了基础。 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
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. 相似文献
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Cheng-Le Zhao Shane Porzio Alan Smith Haiyan Ge H. T. Davis L. E. Scriven 《Journal of Coatings Technology and Research》2006,3(2):109-115
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. 相似文献
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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. 相似文献
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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. 相似文献
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中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2009,37(3)
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. 相似文献
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中蓝晨光化工研究院《塑料工业》编辑部 《塑料工业》2007,35(3):1-25,67
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。 相似文献