共查询到19条相似文献,搜索用时 140 毫秒
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基于废旧轮胎再利用及研发简易且低廉的施工方法与维护成本,本研究以规则波水工模型试验研究提出应用于港口码头的多孔隙弹性帷幕的初步理念。利用模型车轮胎以模块化方式组装成弹性帷幕后安装于码头前壁,研究多种周期波浪作用及不同消波室纵深对波浪反射率的影响。实验结果表明,简单的单一消波室多孔隙弹性帷幕对短周期波浪的消波效果较显著,消波室纵深较大者反射率较低,但可能引致水体振荡,后续可再强化消波室的消能效果。未来如能妥善研究废旧轮胎应用于多孔隙弹性帷幕消波结构物的施工与维修方法,除可缓解废旧轮胎处理给环境带来的压力外,也提供一种可用于简易渔港的施工简单、维修容易且资源再利用的消能结构物,该工程技术亦可输出至发展中国家,符合可持续发展观。 相似文献
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针对海洋溢油污染问题,采用实验室筛选的海洋溢油降解菌HJ01和HJ02开展海洋溢油微生物降解优化研究,采用单因素实验和多因素正交实验进行降解率测定。结果表明,单因素实验条件下,当pH值为7、培养温度35℃、石油初始浓度7 500mg/L、NaCl含量20 000mg/L时,HJ01和HJ02对海洋溢油的降解效果最佳。正交实验条件下,HJ01在pH值为7、培养温度35℃、石油初始浓度7 500mg/L、NaCl含量10 000mg/L时降解效果最佳;HJ02在pH值为7、培养温度30℃、石油初始浓度11 000 mg/L、NaCl含量10 000mg/L时降解效果最佳。 相似文献
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海湾战争造成的特大石油污染灾难 总被引:1,自引:0,他引:1
1991年1月下旬,因海湾战争导致的大量原油涌入海湾,造成了人类有史以来最大的一起石油污染,给海洋生态环境和沿岸人民带来了沉重的灾难。为此,海湾沿岸国家在国际社会的援助下展开了除污大战并取得了显著的进展。目前,虽然海湾战火已停息多年,但水域的油污还难以彻底消除。一些科学家乐观地预测,治理工作要持续10年之久,其费用需要上百亿美元。而更多的专家则认为,油污对海洋生态的破坏程度,至少上百年也难以恢复。本文以文献资料为依据,综述了海湾溢油的起因、溢油形态、对环境的影响及清污过程等。 相似文献
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从溢油应急管理体系、溢油应急物资、溢油应急处置技术、溢油综合评估、溢油预测预警和应急决策支持系统等方面,系统梳理了国内外海上溢油应急处置的研究现状,并对溢油应急管理作出展望。提出未来我国应在溢油风险防控、溢油综合应急平台、溢油应急处置和溢油生物修复等方面加强管理和技术研发工作,不断提升我国溢油应急综合能力。 相似文献
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基于计算流体力学软件的三维数值模拟技术,分析了碟形越浪式波能发电装置的越浪性能,通过构建基于水气两相VOF(Volume of Fluid)模型的三维数值波浪水槽对该装置进行三维数值模拟研究,数值计算结果与物理试验结果相互对比验证较为吻合,验证了所构建的三维数值波浪水槽的可靠性,通过考察装置的坡度、导流叶片个数、干舷高度对越浪性能的影响确定装置的最优结构参数。结果表明,在装置的斜坡面边缘增加回流板可减少波浪的反射,提高装置的越浪性能。在数值模拟中将装置的斜坡面边缘处安装回流板对碟形越浪式波能发电装置参数进行优化,通过分析回流板的长度对装置越浪性能的影响来探索最优回流板长度。 相似文献
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The toxicities of two dispersants (Biosolve and OSD 9460), Forcados light crude oil and their mixtures based on ratios 6:1,
9:1, and 12:1 (v/v) were evaluated against the juvenile stage of African catfish, Clarias gariepinus, in laboratory bioassays. On the basis of the derived toxicity indices, Biosolve (96-h LC50 = 0.211 μl/l) was found to be about 27,284 times more toxic than crude oil (96-h LC50 = 5.757 ml/l) and 6,450 times more toxic than OSD 9460 (96-h LC50 = 1.361 ml/l). OSD 9460 was also found to be four times more toxic than crude oil when acting alone against C. gariepinus. Toxicity evaluations of the mixtures of crude oil/dispersants mixtures varied, depending largely upon the proportion of
addition of the mixture components. The interactions between mixture of crude oil and Biosolve at the test ratios of 6:1,
9:1, and 12:1 were found to conform with the model of synergism (SR = 7,655, 14,876, and 8,792, respectively), and the mixtures
were therefore more toxic than the crude oil acting singly. Similarly, the interactions between mixture of crude oil and OSD
9460 at the test ratios of 6:1 and 9:1 also conformed to the model of synergism (SR = 2.2 and 1.84, respectively). Interactions
between the dispersant OSD 9460 and the crude oil at test ratio 12:1, however, conformed to the model of antagonism (SR = 0.84),
indicating that the mixture was less toxic than crude oil acting alone. The results of the emulsification potential of OSD
9460 and Biosolve [measured in terms of optical transmittance (%)] prepared at the dispersal ratios 6:1, 9:1, and 12:1 revealed
that the dispersal ratio of 6:1 achieved the highest emulsification of the crude oil with optical transmittance value of 4%
and 6%, respectively. Estimation of an “environmentally sensitive” dispersal ratio for OSD 9460 and Biosolve revealed the
optimum dispersal ratio for OSD 9460 range between ratios 7.5:1 and 9:1, while for Biosolve such an optimum dispersal ratio
was indeterminate within the range of test dispersal ratios. The implications of these results in setting manufacturer’s and
regulatory dispersal ratios for chemical dispersants used for oil spill control were discussed. 相似文献
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A novel humic acid-based polycarboxylic-type (HAP) dispersant for coal–water slurry (CWS) was successfully synthesized in aqueous solution from the copolymerization of HA, acrylic acid and maleic acid. The structure of HAP was characterized by Fourier transform infrared (FTIR), thermogravimetry (TG) and 1H NMR. With HAP as a dispersant for Linfen coal slurry, the effects of the mass ratio of HA and monomer, initiator concentration, reaction temperature and reaction time on the HAP dispersant performance were discussed by examining the apparent viscosity of CWS. The results showed that CWS prepared withHAP dispersant performed excellent dispersity and stability. When the dosage of HAP was up to 0.5 wt.%, the apparent viscosity of CWS was 505 mPa·s. Experiments on the stability of CWS containing 0.5 wt.% HAP demonstrated that the penetration ratio reached 85.45 % after 96 h, which was higher by 12.87 % than that of CWS prepared with HA. And the CWS produced with HAP had lower dewatering rate within the storage time, which was less 1.85 % than that of CWS with HA when the storage time was 72 h. Furthermore, the maximum coal content of CWS with 0.5 wt.% HAP may reached 70 wt.%. This work found a new route for utilizing humic acid and enlarged the selecting range of the dispersant for CWS. It has a positive significance for protection of environment. 相似文献
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S. T. Wang A. F. McMillan B. H. Chen 《Journal of the American Water Resources Association》1976,12(4):779-798
ABSTRACT By using the method of successive approximations, the one-dimensional diffusion equation was solved for the distribution of pollutant from an instantaneous point source in a semi-infinite body of water under the influence of wind-generated waves. The solution was obtained with the aid of an expression developed in this study to relate the dispersion coefficient to wind speed, characteristics of a wind-generated wave, and drift current velocities. The results indicate that the wave causes the local concentration to oscillate with respect to time around a mean concentration distribution curve. The period of the oscillation is about that of the wave, and its amplitude is always less than 7 percent of the mean. The effect of a chemical reaction is to reduce the level of pollutant concentration, the magnitude of the reduction being dependent upon both the rate constant and the order of reaction. The case of simultaneous dumping of one pollutant at different sites was also considered. 相似文献
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Sandrine Vidal-Gilbert Jean-Francois Nauroy Etienne Brosse 《International Journal of Greenhouse Gas Control》2009,3(3):288-299
CO2 injection into a depleted hydrocarbon field or aquifer may give rise to a variety of coupled physical and chemical processes. During CO2 injection, the increase in pore pressure can induce reservoir expansion. As a result the in situ stress field may change in and around the reservoir. The geomechanical behaviour induced by oil production followed by CO2 injections into an oil field reservoir in the Paris Basin has been numerically modelled. This paper deals with an evaluation of the induced deformations and in situ stress changes, and their potential effects on faults, using a 3D geomechanical model. The geomechanical analysis of the reservoir–caprock system was carried out as a feasibility study using pressure information in a “one way” coupling, where pressures issued from reservoir simulations were integrated as input for a geomechanical model. The results show that under specific assumptions the mechanical effects of CO2 injection do not affect the mechanical stability of the reservoir–caprock system. The ground vertical movement at the surface ranges from ?2 mm during oil production to +2.5 mm during CO2 injection. Furthermore, the changes in in situ stresses predicted under specific assumptions by geomechanical modelling are not significant enough to jeopardize the mechanical stability of the reservoir and caprock. The stress changes issued from the 3D geomechanical modelling are also combined with a Mohr–Coulomb analysis to determine the fault slip tendency. By integrating the stress changes issued from the geomechanical modelling into the fault stability analysis, the critical pore pressure for fault reactivation is higher than calculated for the fault stability analysis considering constant horizontal stresses. 相似文献
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