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危险废物回转窑焚烧系统的工艺设计 总被引:4,自引:0,他引:4
介绍杭州市危险废物回转窑焚烧处理示范工程的一期规模、工艺流程及主要设备的设计方法。 相似文献
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探讨了加入WTO对贸易与环境管理职能的影响,强调突破绿色壁垒,必须发挥政府宏观调控职能,规范和发展环境产业市场,发展生态产业和绿色贸易。 相似文献
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Uptake and metabolic turnover of a variety of radioactively labeled substrates by a number of bacterial isolates from several depths in offshore Atlantic waters were studied in laboratory experiments. The variable conditions were hydrostatic pressure (1 to 400 atm), temperature (1.50 to 15.0°C), concentration of substrate (2 to 500 g/ml), and time of incubation (4 h to 8 weeks). Elevated hydrostatic pressure and low temperature retarded the rate of metabolism (biosynthesis more than respiration) in all isolates tested, but considerably less in those of psychrophilic character.Contribution No. 2944 of the Woods Hole Oceanographic Institution.Supported by the National Foundation Grants GA-33405 and GA-29665. 相似文献
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Christopher Thellen Megan Coyne Danielle Froio Margaret Auerbach Carl Wirsen Jo Ann Ratto 《Journal of Polymers and the Environment》2008,16(1):1-11
A series of polyhydroxyalkanoates (PHA), all containing 1% nucleating agent but varying in structure, were melt-processed
into films through single screw extrusion techniques. This series consisted of three polyhydroxybutyrate (PHB) and three polyhydroxybutyrate-valerate
(PHBV) resins with varying valerate content. Processing parameters of temperature in the barrel (165–173 °C) and chill rolls
(60 °C) were optimized to obtain cast films. The gel-permeation chromatography (GPC) results showed a loss of 8–19% of the
polymer’s initial molecular weight due to extrusion processing. Modulated differential scanning calorimetry (MDSC) displayed
glass transition temperatures of the films ranging from −4.6 to 6.7 °C depending on the amount of crystallinity in the film.
DSC data were also used to calculate the percent crystallinity of each sample and slightly higher crystallinity was observed
in the PHBV series of samples. X-ray diffraction patterns did not vary significantly for any of the samples and crystallinity
was confirmed with X-ray data. Dynamic mechanical analysis (DMA) verified the glass transition trends for the films from DSC
while loss modulus (E′) reported at 20 °C showed that the PHBV (3,950–3,600 MPa) had the higher E′ values than the PHB (3,500–2,698 MPa) samples. The Young’s modulus values of the PHB and PHBV samples ranged from 700 to
900 MPa and 900 to 1,500 MPa, respectively. Polarized light microscopy images revealed gel particles in the films processed
through single-screw extrusion, which may have caused diminished Young’s modulus and tensile strength of these films. The
PHBV film samples exhibited the greatest barrier properties to oxygen and water vapor when compared to the PHB film samples.
The average oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) for the PHBV samples was 247 (cc-mil/m2-day) and 118 (g-mil/m2-day), respectively; while the average OTR and WVTR for the PHB samples was 350 (cc-mil/m2-day) and 178 (g-mil/m2-day), respectively. Biodegradation data of the films in the marine environment demonstrated that all PHA film samples achieved
a minimum of 70% mineralization in 40 days when run in accordance with ASTM 6691. For static and dynamic incubation experiments
in seawater, microbial action resulting in weight loss as a function of time showed all samples to be highly biodegradable
and correlated with the ASTM 6691 biodegradation data. 相似文献
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Amphipods, trapped at depths of 1 410 to 5 330 m and incubated in situ in the presence of a radiolabeled protein as a food source, were fractionated to measure the distribution of label in the major biochemical constituents: low molecular pools, ethanol and base soluble proteins, lipids, polysaccharides and nucleic acids. The results suggest lipid energy storage and enhanced microbial growth within the amphipod guts as compared to growth on the uningested food material. The merits and limitations of this general approach are critically evaluated. 相似文献
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Experiments were conducted in order to specify the reductants responsible for the carbon dioxide fixation of the symbiotic sulfur bacteria in the gutless marine oligochaete Phallodrilus leukodermatus (Annelida) from shallow calcareous sediments in Bermuda. Carbon dioxide-uptake rates were suppressed by S= and stimulated by S2O3
=. Individuals which hosted bacteria containing reserve energy substances maintained a high short-term CO2-uptake activity, while bacteria in worm homogenates and in worms treated with an antibiotic (Baypen) did not show any significant metabolic activity. Absolute uptake rates in P. leukodermatus were usually considerably higher than those reported for other animals harbouring prokaryotic sulfuroxidizing symbionts. Utilization of thiosulfate rather than sulfide is compatible with the preferred occurrence of the worms around the redox discontinuity layer and has been confirmed in other thiobiotic animals. Sulfur stored in the symbiotic bacteria appears to be oxidized to sulfate and be excreted when the worms are held under energy-limited conditions. The data emphasize the complexity of the possible metabolic pathways involved in the oxidation of reduced-sulfur compounds by bacterial symbionts in marine invertebrates. 相似文献
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结合近年来国内外学者关于好氧污泥颗粒化的研究成果,对影响好氧污泥颗粒化的影响因素进行了较为深入系统的分析,提出了适宜的运行控制条件及所需注意的问题。 相似文献