Download or read book Geochemical and Geomicrobiological Studies of the Ammonium Rich Aquifer Aquitard System in the Pearl River Delta China written by Kun Liu and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Geochemical and Geomicrobiological Studies of the Ammonium-rich Aquifer-aquitard System in the Pearl River Delta, China" by Kun, Liu, 刘琨, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: An aquitard is not only a confining layer in the aquifer-aquitard system, but also a functional complex for nutrient reservation and microorganism inhabitation. Geochemical characteristics and geomicrobial processes in aquitards play an important role in groundwater quality, and should be well studied. The Pearl River Delta is dominated by clay-rich aquitards and was intensively influenced by Holocene transgression. In this thesis, the aquifer-aquitard system in the PRD was studied from various perspectives including geophysics, geochemistry and geomicrobiology. Sediment and groundwater samples were taken from representative locations in the PRD at different lithological units. Particle size distribution, computed axial tomography, optically stimulated luminescence dating and scanning electron microscopy were analyzed to understand the geophysical properties. Concentrations of major ions and abundances of environmental isotopes were measured for geochemical analysis. Bacterial 16S rRNA gene clone libraries were constructed to analyze microbial identifications and community structures in different strata. Gene abundances of anammox 16S and bacteria amoA in both sediment and groundwater samples were quantitatively analyzed with 15N isotope at the same depth. The mixing process of seawater and river water was the dominant factor controlling the isotopic and chemical characterizes of groundwater in the system. Isotopic fractionation in the aquitards was majorly controlled by chemical and biological reactions other than diffusion. Chemical pattern in this system was mainly controlled by topography and sea level in the Holocene. Independent sedimentary centers of strong reducing environment were located in the depressions controlled by fault zones, and generated massive amount of pyrite minerals in the sediment and NH4+ in the groundwater. The sea level and depositional environment in the Holocene determined the physical structures of the sediment and seawater/river-water ratio in the estuary. Isotopic research also demonstrated that South Asia Monsoon was the major source of atmospheric precipitation in the PRD. Bacterial species in the PRD sediment were identified. Canonical correspondence analysis between bacterial linages and environment factors showed that community structures were significantly modified by geological conditions. High bacterial diversity was observed in samples from the Holocene aquitard M1 and aquifer T1, while in the older aquitard M2 and basal aquifer T2, the bacterial diversity was much lower. Chloroflexi, γ-proteobacteria and δ-proteobacteria were the dominant phyla in the aquitard sediment. β-proteobacteria was the dominant phylum in sediment which was strongly influenced by fresh water. Anammox was the controlling biochemical process in microbial-derived ammonium loss, as demonstrated by gene abundance coupling with 15N isotope and ammonium concentration. The 16S gene abundance of anammox bacteria ranged from approximately 105 to 106 copies/g in the aquitard sediment, and ranged from 104 to 105 copies/g in aquifers. amoA gene abundance was 1-2 orders lower than anammox bacteria 16S in aquitard sediment, but in aquifers, the gene abundances of amoA and anammox 16S were similar. Interface between aquifer and aquitard was demonstrated as biochemically enhanced zone. The results of this study significantly benefited the

Download or read book Geochemical and Geomicrobiological Studies of the Ammonium rich Aquifer aquitard System in the Pearl River Delta China written by 刘琨 and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chinese Water Systems written by Yonghui Song and published by Springer. This book was released on 2018-05-16 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the huge efforts by the Chinese Government concerning the restoration and future sustainable management of Chinese water systems. It presents the results of a Sino-European joint project concerning the Songhuajiang-Liaohe River Basin (SLRB) in Northeast China conducted by the Chinese Research Academy of Environmental Sciences (CRAES), the Helmholtz Centre for Environmental Research - UFZ, Germany, and the Natural Environment Research Council as represented by the Centre for Ecology and Hydrology (CEH), UK. The book explains in great detail the development of risk assessment and corresponding management methods for (i) controlling water pollution, (ii) assessing river health and ecological restoration options, (iii) characterizing persistent organic pollutants (POPs), and (iv) protecting fragile groundwater resources. It also describes the implemented demonstration sites of SLRB during the project course as well as lessons learnt on efficient project management and the dissemination of knowledge and technologies.

Download or read book The Greater Pearl River Delta written by Michael J.. Enright and published by . This book was released on 2006 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrology and Geochemistry of Aquifer and Stream Contamination Related to Acidic Water in Pinal Creek Basin Near Globe Arizona written by James Gary Brown and published by . This book was released on 1996 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrochemistry of Aquifer Systems and Relation to Regional Flow Patterns in Cretaceous and Older Rocks Underlying Kansas Nebraska and Parts of Arkansas Colorado Missouri New Mexico Oklahoma South Dakota Texas and Wyoming written by Claud H. Baker and published by . This book was released on 1995 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Offshore Freshened Groundwater in the Subaqueous Paleo delta of the Pearl River in the Northern South China Sea written by Chong Sheng (Researcher on earth sciences) and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regional geochemical study of the Western Interior Plains Aquifer System and the Great Plains Aquifer System in the mid continent United States written by Rosario Vasquez Scheerhorn and published by . This book was released on 2005 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Biogeochemical Processes of Biogenic Elements in China Marginal Seas written by Jinming Song and published by Springer. This book was released on 2014-01-14 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Biogeochemical Processes of Biogenic Elements in China Marginal Seas" is the first monograph dedicated to this topic. The book mainly presents the latest research achievements of China's national research projects about the biogenic element cycling processes in China marginal seas starting in 1999. By describing the biogeochemical processes of China marginal seas, including the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea, it covers almost all kinds of typical ecosystems' regional responses to global oceanic changes of the estuarine ecosystem, the continental shelf ecosystem, the upwelling ecosystem, the coral reef ecosystem, and the mangrove ecosystem. It will be of great interest to scientists and researchers in marine science. Dr. Jinming Song is a professor at Institute of Oceanology, Chinese Academy of Sciences.

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Download or read book Biogeochemical Processes of Biogenic Elements in China Marginal Seas written by Jinming Song and published by Springer. This book was released on 2010-11-16 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Biogeochemical Processes of Biogenic Elements in China Marginal Seas" is the first monograph dedicated to this topic. The book mainly presents the latest research achievements of China's national research projects about the biogenic element cycling processes in China marginal seas starting in 1999. By describing the biogeochemical processes of China marginal seas, including the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea, it covers almost all kinds of typical ecosystems' regional responses to global oceanic changes of the estuarine ecosystem, the continental shelf ecosystem, the upwelling ecosystem, the coral reef ecosystem, and the mangrove ecosystem. It will be of great interest to scientists and researchers in marine science. Dr. Jinming Song is a professor at Institute of Oceanology, Chinese Academy of Sciences.