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With investigation in field and assay in the lab, the current situation and influencing factors of groundwater nitrate nitrogen (hereinafter referred to as NO3- - N) content in the regions surrounding Bohai Sea in Hebei province were studied. The results show that the contents of groundwater NO3- - N in the regions generally meet the level III criterion of GB/T14848-93. However, the spatial variability...
Aimed at the current situation of nitrogen pollution in groundwater, adsorption characteristics of ammonia-nitrogen onto different lithology named silty sand, silty clay and clay were studied. The results indicated that the process of ammonia-nitrogen adsorption onto soils mainly occurred within 0~2 h, then attended to a dynamic equilibrium. Two kinetic models can describe the experiment data and...
N and P non-point source pollution status of vegetable fields in the suburb of Fuzhou city was evaluated by testing samples of vegetable (120 samples), soil surface water (16 samples) and groundwater (11 samples) collected from 14 pieces of vegetable fields which were located at the suburb of that city according to the related criteria in this paper. Results showed that (1) Proportions of vegetable...
In recent years, the effect of pavement surface runoff on roadside water resources has aroused widespread attention. According to the research project of "Study on the key drainage technology of down-traversing crossroad in North China Plain area", the paper investigates the climate, geology, and hydro-geology of the plain areas of north China, analyses their characteristic as low water...
This passage took soil samples from Chaohu wetland at 1.5 m buried depth. Then isolated the dominant bacteria and studied its denitrification activity under the condition of different carbon sources (methanol, ethanol and acetic acid) and C/N (3:1, 5:1, 10:1). The results suggested: (1) the nitrate removal rate of isolated strain reached 90% (named as D9); (2) under the condition of C:N was 1:1, acetic...
A study assessed the risk of nitrate (NO3--N) pollution in groundwater was conducted in Zhangye Oasis, Northwest China. The mean value of NO3--N concentrations of groundwater samples was 10.66plusmn0.19 mg/L, NO3--N concentrations exceeding 10 mg/L (the threshold of drinking water set by World Health Organization) was found in 32.4% of 71 wells, and were 13%, 33.3%, 52.4%, and 50.0% in the groundwater...
It has been found that non-point source pollution - excessive nitrogen loading is one of the main reasons for the eutrophication of Miyun Reservoir, Beijing, China. At present, the research about eutrophication is still confined to a single level of analysis lacking a full perspective of monitoring, integrated simulation and evaluation. The model domain is the area of Miyun Reservoir, Beijing. This...
Groundwater constitutes the largest single source of fresh water in many parts of the world and provides a risk buffer to sustain critical water demands during cyclic and prolonged dry periods, especially in semi-arid and arid regions. Intensification of agriculture, increases in land area devoted to arable crops, intensification of animal husbandry, and a move away from arable rotations toward monoculture...
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