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According to the monitoring record, human nuclear activities, especially intensive nuclear tests during the 1960s in the world, caused atmospheric tritium concentration increasing significantly, which provided convenient condition for global water cycle research, especially for tracer dating research of groundwater. However, due to the layout of monitoring sites and other reasons, most parts of the...
Based on the analysis of the classification of environmental incidents, the characteristics of environmental incidents in China during 2004~2011 are analyzed in this paper. Problems existing in the environmental risk management system of China are summarized, namely, the importance of environmental events risk management and data source acquisition is insufficiently recognized, systemic and scientific...
Environmental risk prevention has been included in China's national environmental protection plan of the Twelve Five-year (2011–2015). The establishment of environmental risk management system is an important issue for accident prevention and risk control. With reference to the general guidance on risk management programs for chemical accident prevention of the US EPA, the main procedures of environmental...
Based on environment statistics data from 1992–2008, the changing tendency, types, causes and directly economic losses of national environmental pollution accidents were analyzed, and the high risk areas of water and air pollution accidents were studied by using Supermap. The results indicated that the number of annual environmental accidents was maximally 3001 times in 1994 and minimally 462 times...
The hexavalent chromium (Cr(VI)) removal by zero-valent iron (Fe0) was investigated under various groundwater geochemistry conditions though batch experiments. The results showed that the collective influences of humic acid, HCO3−, and Ca2+ on the reactivity of zero-valent iron for Cr(VI) removal were different from their individual impacts. The sole presence of humic acid did not show a significant...
The purpose of the study is to study the evolution mechanism of groundwater geochemical field in the Yongding River of Beijing. Firstly, based on the ion composition ratio method and ion complexation model, the reasons of the groundwater chemical field were analyzed qualitatively. Then, PHREEQC software was used to perform a geochemical modeling for water-rock interaction, and analyze quantitatively...
In the paper the characteristic of slime has been studied by mathematical model. Something condition may contribute to the rate of drying such as different types of slime, different particles, different drying temperatures and different dry air volume. Then according to the theoretical analysis of the impact of the factors, some suggestion can be obtained to enhance the drying efficiency of slime.
Groundwater quality plays a vital role in the safety of water supply. To assess groundwater quality in Quanzhou coastal area, a total of 183 groundwater samples were collected from shallow and deep wells in the area. Results of the study reveal that the main pollutants in Quanzhou coastal area are NO3-, NO2-, and NH4+. The values of pH vary from 4.05 to 7.85. About 3% of groundwater is very hard and...
The sorption extent and influencing factors of plutonium (Pu) in the soil, from a candidate site for disposing very low level waste (VLLW) in southwestern China, were studied by batch-type experiments. The equilibrium time of Pu sorption firstly were determined, sample grain size, aqueous pH, and temperature were then studied as the factors to influence Pu sorption. The experimental variables included...
Emissions of underground diesel engines are facing more and more stringent control because of their adverse effects on human body. The novel zonal guarantee technology presented in this paper will remove the heat and contaminant simultaneously and effectively. The technology divides the space into the stronger load zone and the weaker load zone. For different zone, ventilation and cooling system uses...
Vanadium was a trace element, which may be biologically beneficial and possibly essential but certainly harmful to human beings and some living organisms if excessive. In order to investigate potentially environmental risk of vanadium, a total of 46 topsoil samples were collected in dry and wet season in Panzhihua urban park. The concentration of bioavailable vanadium in wet season was higher than...
Cold storage system called "thermal storage cooling tower" which works with cooling water of air-conditioning system is introduced. By setting packing materials above the air conditioning pool of underground commercial building, a new type heat and mass transfer device is developed to replace the original combination of cooling tower and thermal storage tank. Running the equipment with proper...
It is the premise for the diesel generator set to maintain the proper indoor environment of underground diesel generator plant. Based on the analysis and summarization of the merits and drawbacks for the diesel generator set heat exchange modes and ventilation and cooling schemes of underground diesel generator plant, this paper proposes a novel ventilation and cooling scheme for water cooling and...
In this paper the ZGT (zonal guarantee technology), which has been introduced in the companion paper, is applied to the deep-buried underground engineering. Then, four novel ventilation and cooling systems for the underground diesel generator plant are presented. The optimization of the location of the fume exactor and exhaust duct and the speed of the supply air is done by the CFD simulation for...
It is the premise for the diesel generator set to maintain the proper indoor environment of underground diesel generator plant. Based on the analysis and summarization of the characters of the heat and contaminant distribution in the underground generator plant, this paper proposes the ZGT (zonal guarantee technology) to remove the residual heat and contaminant with less energy. CFD software is adopted...
The present research is to analyze the effects of spindle speed (n), feedrate (f) and axial depth of cut (ap) on average surface roughness parameters (Ra) in the micromilling operation. Compared with the conventional milling operation, the non-linearity of micromilling is more obviously, because of the minimum chip thickness, tool radial error motion and workpiece inhomogeneous inherent. In this work,...
A novel approach is proposed for underground commercial building to solve series environmental problems caused by cooling tower (CT) widely used. By setting packing materials above the underground pool, a new type heat and mass transfer device was developed to replace the traditional one. Meanwhile, the pool can be served as thermal storage tank to optimize the cooling system. Such a design was applied...
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