Experimental research on inhibition performances of the sand-suspended colloid for coal spontaneous combustion

Serious mine fire disasters have occurred in Northwest China where there are abundant coal resources. For the shortage of water and loess, a large cost of conventional grouting slurry is needed. However, plenty of sand and fly ash resources have been found there. In order to improve the quality of sand injection and reduce the wastage of water during grouting, a kind of new compound material of sand-suspended colloid, which is composed of mineral inorganic gel and organic polymer, was developed in this paper. And the inhibition performance experiments of the sand-suspended colloid were carried out. The results show that the sand-suspended colloid efficaciously affected the oxidation characteristics above the critical temperature during the acceleration oxidation of the lignite and fat-gas coal samples and restrained the oxidation course by increasing the activation energy, so that it reduced the contents of CO and C₂H₄ and depressed the oxidation rate during the coal spontaneous combustion, and finally inhibited the coal spontaneous combustion.     

Imidazolium based ionic liquids affecting functional groups and oxidation properties of bituminous coal

Low temperature oxidation of coal will result in coal spontaneous combustion in mined-out areas. We proposed to use ionic liquids to inhibit the coal spontaneous combustion in this paper. In order to study the inhibiting effect of ionic liquid (IL) on coal oxidation, we successfully dissolved bituminous coal samples in six kinds of imidazolium based ionic liquids, [AOEmim][BF₄], [HOEmim][BF₄], [Amim][Cl], [Emim][AC], [Bmim][AC] and [Bmim][OTf]. The functional groups in the coal samples pre-treated by different ILs were detected by Fourier Transform Infrared Spectroscopy (FTIR) in detail. It is found that the ILs are capable of breaking the associated hydroxyls into dissociated hydroxyls. And during the interaction between coal and ILs, the carboxyl groups have been created. Thermo Gravimetric experiment results show that the weight loss ratios of the IL-treated coals were less during 20–400 °C stage, compared with the IL-untreated coal, which indicates that most of the easily reductive groups effectively dissolved in the ionic liquids. According to the exothermic rate curves and the computed activation energy values, it is demonstrated that the [Bmim][OTf] and [Bmim][AC] make better effect than the other ILs for depressing the oxidation rate of bituminous coal.     

浅谈联合站管线的腐蚀与防护

针对孤东采油厂集输联合站管道腐蚀十分严重、穿孔比较频繁的现状,分析了腐蚀产生的原因,采取了加强管道防护保温、强制阴极保护法等措施,防止了联合站管道的腐蚀.     

应用射流洗砂装置保护油区环境

为保护环境,将联合站大罐及分水器等清出的油砂进行处理是十分必要的.介绍了射流洗砂装置的组成、工作原理及应用情况.该装置的应用,对油砂中的污油回收及环境保护具有十分重要的意义.     

A Marine Pollution Study of Northeast Coastal Water Off Taiwan Island

Abstract

The coastal water of northeast Taiwan island, called ‘Yin-Yang Hai’ for its distinct yellow colour compared with blue offshore water, was investigated from 1989 to 1990 by the authors. Biological study showed the dominant species of plankton to be Copepoda, Cladocera, planktonic eggs and Diatoma. Dominant species of benthos were young crabs, Amphipoda and Annelida, with Amphipoda usually occurring in heavily polluted areas. Heavy metal data showed that the concentration of copper was high. the copper and iron concentration in algae of the intertidal zone was also high. the concentrations of iron and copper in inshore water were also higher than in offshore water. By comparison of the pH and salinity distribution of this area, we conclude that this coastal water has been polluted by acid waste water from coastal industry. the suspended solids concentration in sea water is high. Flocculation occurring at the boundary of fresh and saline water might be a reason for the distinct yellow colour of the water of this area. Further study is required.     

Sedimentary Pigments and Organic Matter in Relation to Benthic Fauna in the Tan-Shui Estuary,Taiwan

The benthic ecological structure of the Tan-Shui estuary, Taiwan is changed due to long term effects of dumping of urban wastewater and of engineering actions. to monitor these changes, we sampled and analyzed benthos and sediment from 12 stations on the estuary.

The composition of the dominant species of benthos varied seasonally, with molluscan and crustacean species having greater numbers and higher frequencies of occurrence than other species. the dominant taxa during winter were Nassarius sp. and Maldanidae at two stations. Analysis using Simpson's index and Shannon's index showed the benthic community varied more in coastal areas than in offshore areas.

Physicochemical analysis showed that most of the Tan-Shui estuary consisted of sandy sediment. the variations in concentrations of organic carbon and total nitrogen at each station were small. Although the concentrations of chlorophyll-a and carotenoid at all stations were generally low, the two stations had the highest concentrations, and we concluded that the concentration of pigments in these sediments was related to the abundance of benthos. the community structure of the benthos reflected the characteristics of the sediments, and benthic species exhibited selection of and adaptation to specific sedimentary environments.     

PCB 105-induced ultrastructural alterations in the rat liver: A stereological study

Liver alterations were stereologically determined in five groups, each of 10 male and female Sprague–Dawley weanling rats fed PCB 105 (2,3,3′,4,4′-pentachlorobiphenyl) for 13 weeks at concentrations of 0.05, 0.5, 5, and 50?ppm mixed with corn oil. Animals from two groups receiving the oil in diets served as controls for each gender. A significant increase in mean volume fraction (VF) of smooth endoplasmic reticulum (SER) profiles was estimated in hepatocytes of female rats in 0.5, 5, and 50?ppm groups. A significant decrease in VF of mitochondria in female rats at 50?ppm was detected. In addition, a decrease in VF of lipid droplets was measured in female rats at 0.5, 5, and 50?ppm groups. No difference was found in VF of rough endoplasmic reticulum (RER) cisternae, and peroxisome profiles at any concentration of the PCB in either male or female animals as compared to baseline values from controls. A significant elevation of baseline VF for RER in female rats was detected in comparison with males. In the present study, no observable adverse effect level (NOAEL) for PCB 105 was estimated at <0.5?ppm for hepatocyte alterations in female Sprague–Dawley rats.     

Characterization of chemical species in universal sampler (PM2.5 and PM2.5–10) aerosols in suburban area of central Taiwan

Aerosol samples of particulate and chemical species for PM₁₀ (particulate matter with aerodynamic diameters less than 10 μm) collected by Universal sampler were studied from June to August 1998 in the suburban area of central Taiwan. The ratios of PM_2.5/PM_2.5–10 displayed that the fine particles (particle size < 2.5 μm) are prevailing in the suburban site. Ion Chromatography was used to analyze for the water‐soluble ions: sulphate and nitrate in the Universal samples. Also, the collected samples were analyzed by atomic absorption spectrophotometry for the elemental analysis of Ca, Fe, Pb, Cu and Cr. The results indicated that the crustal elements (Ca and Fe) and resuspended matters were dominated in the coarse particulate mode while the anthropogenic elements (Cr, Pb, Cu) and sulphate components are mainly in the fine particle fraction. The results also showed that the sulphate and nitrate make the largest portion of the chemical species collected by Universal sampler (PMio). The concentrations of heavy metals in THU are generally high, owing to the higher motor vehicle and industrial density nearby. The degree of pollution from this source differs from day to day, depending on the motor vehicle density.     

Sterol production and phytosterol bioconversion in two species of heterotrophic protists, Oxyrrhis marina and Gyrodinium dominans

The kinetics and efficiency of sterol production and bioconversion of phytosterols in two heterotrophic protists Oxyrrhis marina and Gyrodinium dominans were examined by feeding them two different algal species (Rhodomonas salina and Dunaliella tertiolecta) differing in sterol profiles. R. salina contains predominantly brassicasterol (≅99%) and <2% cholesterol. The major sterols in D. tertiolecta are ergosterol (45–49%), 7-dehydroporiferasterol (29–31%) and fungisterol (21–26%). O. marina fed R. salina metabolized dietary brassicasterol to produce 22-dehydrocholesterol and cholesterol. O. marina fed D. tertiolecta metabolized dietary sterols to produce cholesterol, 22-dehydrocholesterol, brassicasterol and stigmasterol. G. dominans fed either R. salina or D. tertiolecta metabolized dietary sterols to make cholesterol, brassicasterol and a series of unknown sterols. When protists were fed R. salina, which contains cholesterol, the levels of cholesterol were increased to a magnitude of nearly 5- to 30-fold at the phytoplankton-heterotrophic protist interface, equivalent to a production of 172.5 ± 16.2 and 987.7 ± 377.7 ng cholesterol per mg R. salina carbon consumed by O. marina and G. dominans, respectively. When protists were fed D. tertiolecta, which contains no cholesterol, a net production of cholesterol by the protists ranged from 123.2 ± 30.6 to 871.8 ± 130.8 ng per mg algal C consumed. Cholesterol is not only the dominant sterol, but a critical precursor for many physiologically functional biochemicals in higher animal. As intermediates, these heterotrophic protists increase the amount of cholesterol at the phytoplankton–zooplankton interface available to higher trophic levels relative to zooplankton feeding on algae directly.     

孕期暴露全氟烷基磺酸盐(PFOS)诱导胎鼠肺损伤

为研究全氟辛烷磺酸盐(PFOS)暴露对胎鼠肺部损伤的诱导作用,孕期SD大鼠在5～20mg·kg-1剂量范围内的PFOS中处理7d,取胎鼠全肺并分析其发育所受的影响。通过形态学比较,发现随着PFOS浓度的增加,胎鼠体长和体重均显著降低,高剂量暴露会导致胎鼠死亡。通过组织学检测,发现胎鼠肺的发育受到PFOS暴露的抑制。通过WesternBlot检测肺泡Ⅰ/Ⅱ型细胞的发育,发现肺泡Ⅰ型细胞特异蛋白Podoplanin表达显著减少(p<0.05),肺泡Ⅱ型细胞特异蛋白SP-C表达减少但未出现显著差异,此外,与对照组相比高剂量暴露会引起血管内皮生长因子(VEGF)表达显著减少(p<0.01)。实验结果说明,PFOS暴露会导致胎鼠肺部发育出现损伤,这种损伤可能是肺泡Ⅰ型细胞及肺部血管发育受抑制引起胎鼠肺部气体交换功能破坏。