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81.
Zhe Liu Hao Wei Jie Bai Jing Zhang Dongyan Liu Sumei Liu 《Water, Air, & Soil Pollution: Focus》2007,7(6):607-623
A 3-D biological model was developed and coupled to a hydrodynamic model, i.e., Princeton Ocean Model, to simulate the seasonal
variation and budget of dissolved inorganic nitrogen, phosphate, and silicate in Jiaozhou Bay. The modeled nutrients distribution
pattern is consistent with observation. Silicate, the most important limiting element for phytoplankton growth, is characterized
by consumption in spring, increase in summer and autumn, and accumulation in winter, whereas dissolved inorganic nitrogen
and phosphorous have increasing trend with low rates in spring, due to excessive river loads. Phytoplankton plays an important
role in nutrient renewal by photosynthesis and respiration processes. During an annual cycle, 7.83 × 103 t N, 0.28 × 103 t P, and 3.93 × 103 t Si are transported to the bay’s outer sea, i.e., the Yellow Sea, suggesting that Jiaozhou Bay is a significant source of
nutrients for the Yellow Sea. The spatial distribution of nutrients is characterized by vertically homogeneous profiles, with
high concentration inside the bay and low concentration toward the bay channel. These features are mainly governed by strong
turbulent mixing, fluvial influx, water exchange rate, and Yellow Sea water intrusion. Numerical experiments suggest that
the government should pay enough attention to proper layout of sewage drainage. 相似文献
82.
污染防治最佳可行技术(BAT)是污染综合防治与控制工作中的一个重要组成部分,对实现污染减排目标以及从整体上实现高水平的环境保护具有重要作用。介绍了BAT在污染物排放限值制定中的应用,以及国内外选择和确立BAT的程序及方法。由于基于技术的选择涉及多方面因素,在技术评估过程中尚有许多问题有待解决。针对BAT技术评估过程中技术的最佳组合难以确定,以及经济可行性难以量化这两方面问题,介绍了国内外学者的相关研究。 相似文献
83.
B. Buszewski T. Buszewska A. Chmarzyński T. Kowalkowski J. Kowalska P. Kosobucki R. Zbytniewski J. Namieśnik A. Kot – Wasik J. Pacyna D. Panasiuk 《Regional Environmental Change》2005,5(2-3):97-110
This review paper describes the state of the Vistula basin and the Baltic Sea area. The article is divided into two parts concerning the river and the Baltic coastal zone, respectively. Each part describes the geography and the environmental state of the region and gives an overview of the socio-economic conditions. The environmental state of the study regions is described in terms of annual monitoring data for the main physico-chemical and biological parameters. The data cover the last decade. The socio-economic overview includes parameters such as e.g. population density, industrialization, agricultureand land use.SI: Pirrone 相似文献
84.
Service M. Durrant A. E. Mills J. A. Taylor J. E. Faughey D 《Journal of Coastal Conservation》1996,2(1):159-168
Studies were conducted on nutrient cycling in two coastal embayments; Strangford Lough and Belfast Lough, in order to classify
these coastal waters in compliance with the European Union Urban Waste Water Treatment and Nitrates Directives. Analysis of
the data suggests that Strangford Lough is nitrogen-limited throughout much of the growing season with chlorophyll-a levels
comparable to the open Irish Sea. In contrast, much of Belfast Lough is never nitrogen-limited and, with chlorophyll-a levels
at time exceeding 50 μg/l, is exhibiting symptoms of eutrophication. 相似文献
85.
Self-purification ability of a resurgence stream 总被引:14,自引:0,他引:14
The self-purification ability of a resurgence stream has been investigated by taking samples along the course of a channeled tract made up of a first part in beaten soil (3.3 km) and a second in concrete (7.2 km). The study has been conducted by statistically processing pre-existent data, acquired monthly by analyzing waters at the beginning and at the end of the whole canal for 6 years, from 1995 to 2000 (historic data), and by performing specific experiments (recent data) to evaluate differently the self-purification capacity of the beaten soil section and that in concrete. A significant abatement of concentrations has been observed from historic data for ammonium, phosphates, turbidity, heavy metals and bacteria. From the recent data, all these parameters seem to decrease in the beaten soil tract. Whereas significant further decreases in the concrete tract were observed only for ammonium, phosphates and bacteria. For other parameters, e.g. pH, dissolved oxygen, chlorides, fluorides, sodium, and sulfates, a significant increase was observed from the historic data. 相似文献
86.
Yirong Hu Wenjie Du Cheng Yang Yang Wang Tianyin Huang Xiaoyi Xu Wenwei Li 《Frontiers of Environmental Science & Engineering》2023,17(5):55
87.
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89.
Algae offer a multiple-benefit opportunity as the products that can result from algal cultivation are numerous and diverse. However, commercial production of algal-derived materials is scarce and in Queensland Australia is virtually non-existent, partly due to challenges around readily available resources. In this work, the potential to regionally recycle waste nitrogen (N), phosphorus (P) and CO2 to support algal production is considered. A feature of the work is mapping the availability of the three resources for algal cultivation (N, P and CO2) together with climatic and land use considerations. Mapping resolution is defined by the boundaries of Queensland's (Australia) regional authorities. Layering the maps enables identification of regional hotspots for growing algae. Waste resources are shown to be most abundant in Mackay, Burdekin, Toowoomba, Cassowary and Bundaberg; regions which also have favourable eco-climatic conditions. Waste nitrogen is the limiting waste stream, in these and most other regions however additional requirements can be fixed atmospherically, whereas waste CO2 is shown to be abundant relative to waste nutrients. It is found that, based on the availability of waste phosphorus, the top 5 most suitable regions have sufficient resources to produce around 1.1 million t/y of algal biomass. This could potentially produce 309 ML of biodiesel which is 5% of Queensland's 2011 diesel oil sales. The outcomes of this work highlight new opportunities for industrial ecology in non-urban regions. 相似文献
90.
Periodically hydrologic alterations driven by seasonal change and water storage capacity management strongly modify physicochemical properties and chlorophyll-a (Chl-a) and their interactions in dam-induced lakes. However, the extent and magnitude of these changes still remain unclear. This study aimed to determine the effects of periodically hydrologic alterations on physicochemical variables and Chl-a in the dam-induced urban Hanfeng Lake, upstream of Three Gorges Reservoir. Shifts in Chl-a and 13 physicochemical variables were recorded monthly in the lake from January 2013 to December 2014. Chl-a was neither seasonal nor inter-annual differences while a few physical variables such as flow velocity (V) exhibited significantly seasonal variabilities, and chemical variables like total nitrogen (TN), nitrate-nitrogen (NO3-N), total phosphorus (TP), dissolved silica (DSi) were markedly inter-annual differences. Higher TN:TP (40:1) and lower NO3-N:DSi (0.8:1) relative to balanced stoichiometric ratios suggested changes in composition of phytoplankton communities and potentially increased proportion of diatom in Hanfeng Lake. Chl-a was predicable by combination of dissolved oxygen (DO), TN and DSi in dry season, and by V alone in wet season. During the whole study period, Chl-a was solely negatively correlated with TN:TP, indicating decline in N concentration and increase in P could therefore increase Chl-a. Our results highlight pronounced decoupling of linkages between Chl-a and physicochemical variables affected by periodically hydrologic alterations in dam-induced aquatic systems. 相似文献