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The microorganism (strain F10) with 63.2% denitrifying intensity was isolated from river sediment. By checking the individual morphology, colony culture characteristics, DNA sequencing and 16S rDNA gene bank, F10 was identified as Alcaligenes faecalis. The strain is expected to be of a source organism for in situ bioremediation or bioaugmentation.
Organochlorine pesticides and polychlorinated biphenyls content can be obtained By measuring Wanzhou of the Yangtze River and Wanzhou Zhuxi River water environment (water, aquatic biota, sediment): Water and Sediment content of organochlorine pesticides and PCBs are increased flowing down; Organochlorine pesticides in the water and Sediment are β-HCH> δ-HCH> α-HCH> γ-HCH, and pp'-DDE>...
The Batch equilibrium experiments were used to reveal streptomycin adsorption on three kinds of soils in Inner Mongolia pastoral, China. The effects of pH, soil organic content and microorganisms on adsorption were investigated. The results obtained were well-described by the Freundlich and Langmuir model, while fitted the linear model successfully. Different adsorption behaviors of streptomycin were...
Dianchi Lake, one of the most eutrophication freshwater lakes in china, has been under severely eutrophic condition since 1970s. This study investigated the concentrations of total phosphorus (TP), soluble reactive phosphorus (SRP) in the overlying water and the interstitial water in water-sediment interface through analysis of the water samples collected from 37 sites around Dianchi Lake to obtain...
Since 2003, the operation of the Three Gorges project (TGP) has obviously decreased sediment transportation into the downstream Yichang navigation channel. Therefore the erosion & incision of this channel and the deterioration of navigation condition can be expected. A fluvial morphology analysis of Yichang channel was given in this study and the results showed that: the main erosion zone has...
[Objective]To determine influence of urban sewage to zebrafish embryos and their larvas hatched into. [Method]By using of static method, toxic effects of urban sewage treated or untreated on zebrafish embryos and larvas were observed under control conditions in laboratory. Furthermore, their possible toxic mechanisms were also discussed. [Result]The sewage of M sewage treatment plant in AnNing District,...
Chemical sequential extraction was employed to analyze the phosphorus species in surface sediments in the representive five sites of Lake Baiyangdian. The results showed that exchangeable phosphorus(Ex-P) was the lowest fraction and had little effect to eutrophication of Lake Baiyangdian. The ironbound phosphorus(Fe-P) was the main fraction. The release of Fe-P in sediment was an important process...
Based on the difference of flow field, suspended sediment concentration and transportation in the North Passage between in Jan. 1998 and in Feb. 2008 using Delft3D model, the dynamical mechanisms of the morphological change in the North Passage are discussed in this paper. The results are summarized as follows: 1) the water depth in the North Passage has increased due to the enhanced resistance produced...
Lvdao Island is located in the east coastal area of Tsingtao. At the east of Lvdao Island, there is a national famous tourist island called Tianheng Island. Between them there is a tidal channel witch is about five to seven meters death and one thousand meters width. This channel is the main water-exchange way between the 1shoreside. So it will facilitate the economic activities of human if an entrance...
There are six samples to be sampled as the research subjects of the Bulao river. The contents and fractions of heavy metals is determined by ICP-MS and the results showed the concentration of heavy metals' residual form is very high. and Total organic carbon is analysed by liquitoc analyse appliance. The results showed that the relations between TOC and acid extractable form is good.
Paleocurrent direction analysis is an important aspect of sedimentology and paleoenvironment reconstruction. The paper presents two major categories of paleocurrent direction analysis, which was classified according to the avaiable information, such as rock composition, heavy mineral analysis, the various sedimentary structures, sedimentary facies, seismic facies and so on, one is qualitative method,...
Regarded as a sensitive indicator to paleoclimatic changes, the organic carbon isotope (δ13Corg) in lake is widely used to reflect paleoclimatic condition and paleoenvironmental evolution. By combining analysis of other proxies, this paper is to the implications of δ13Corg in Jianghan Plain of warm and moist climate setting. The values of δ13Corg in Jianghan Plain can indicate the varieties of rainfall...
Present bedload transport rate formulas, such as Einstein and Meyer-Peter formulas, failed to predict for high shear conditions. Experimentation and analysis demonstrated that mobile beds at high shear stress obey neither the smooth-boundary nor the rough-boundary law, but follow a different friction relation of their own. By deploying Guo's logarithmic matching method, this paper develops a uniform...
With the development of offshore oil and gas fields, research on the protection of submarine pipeline which is one of the most important aspects of an offshore oil field exploitation system, becomes more important. In this paper, a series of experiments has been conducted to compare the effectiveness of rigid spoilers installed on the top of the pipeline with the effectiveness of flexible spoilers...
34 points of surface sediments in Taihu Lake were observed on the distribution of Acid Volatile Sulfide (AVS) and Simultaneously Extracted Metal (SEM), and the relativity was analyzed between contents of AVS, AEM and the physical and chemical indices of the surface sediments. Results show that there is a significant difference on the spatial distribution of AVS and SEM contents in the whole lake of...
Continental collision between Indian and Asian plates at 65 Ma terminated the Cretaceous sedimentation on the northern margin of the Indian passive continent and resulted in the formation of the South Tibet Paleogene Foreland Basin (STPFB) and its associated unconformity. The STPFB sediments overlie an Indian passive continental margin sequence, and include 65 Ma deep-water turbidite sequence that...
Certain environmental factor's change leads to the imbalance of marine environmental system. The engineering cumulative impact wasn't considered within the environmental impact assessment, so the environmental impact results are not completely. In this paper, an integrated cumulative impact analysis and assessment of hydrodynamic and water environment by the great marine engineering of Hebei and Tianjin...
Hyperspectral imagery offers an effective way to automatically mapping of surface sediment types in the intertidal flat. The objective of this study is to determine the possibility of mapping sediment types in the southern Sheyang River mouth, Jiangsu Province from Hyperion satellite data with linear spectral unmixing method. Results indicate that the mapping was achieved at an overall accuracy of...
A method based on spiking performance reference compounds (PRCs) into low density polyethylene (LDPE) to measure freely dissolved Hydrophobic organic compounds (HOCs) in overlying water and sediment was introduced. Equilibration time of PRCs migrate to LDPE was determined and freely dissolved concentrations of three PAHs (acenaphthene, phenanthrene, pyren) in overlying water and sediment pore water...
Soil erosion causes both on-site and off-site impacts that contribute to economic loss of different extent. On-site impacts include losses of sediments, soil nutrients and water; whereas off-site impacts include soil detainment and siltation, respectively. Based on the date of the remote sensing survey on the soil erosion in Linyi City, monetary loss caused by soil erosion were calculated using different...
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