【摘 要】
：
The main purpose of the research is to discuss the influence on ground water by NH4-N in polluted river and river bed. In the lab-scale experiment three kinds of natural sand were chosen as infiltration medium, and polluted rivers were simulated by domest
【机 构】
：
School of Resources and Environment, North China Institute of Water Conservancy and Electric Power,
论文部分内容阅读
The main purpose of the research is to discuss the influence on ground water by NH4-N in polluted river and river bed. In the lab-scale experiment three kinds of natural sand were chosen as infiltration medium, and polluted rivers were simulated by domestic sewage, after 10-month sand column test it was found that NH4-N came to adsorption sa-turation on the 17th day in coarse sand and on the 130～140th day in medium sand, then had a higher effluent concentration because of desorption. It is concluded that NH4-N eas-ily moved to ground water. When the concentration of NH4-N in Liangshui River were 46.86, 26.95 mg/L, that in groundwater are less than 1.10 mg/L. It is found that Liangshui River have a little influence on groundwater because of bottom mud, thickness and char-acter of the infiltration medium under the river bed and seepage quantity of river water.Clean water leaching test states that after the silt is cleared away and clean water is poured, NH4-N in the penetration media under the polluted river is obviously carried into ground water, and ground water is polluted secondly.
其他文献
Based on the Winkler model, a mechanic model was established with formulas derived concerned with the deformations before and after a roof breakage at places in front of and at the back of the working face. In accordance with the theory for rock beam brea
Presented a new coal dust control program that was airtight negative pressure dust-control technology at the transpersite,combining with analysis with the movement of air currents and numerical simulation of gas-solid flow at the transpersite,and proved t
With FLAC,a criteria of stress release ratio(SRR),i.e.,about 10% of the relative difference of the ground settlement before and after the supporting system is installed,is incorporated into stress release method(SRM).At the same time,the Mohr-Coulomb Crit
Based on the open stope method, the stability of the gob area was decided by pillars and stiff roof. Therefore, it was dispensable to leave pillars with long-term strength and enough size to support the stiff roof during mining activities. Based on the mi
The mechanical principle and surrounding rock deformation feature of high stress coal roadway was analyzed. The condition of stress balance of the kind of the roadway was put forward. The surrounding rock control principle and supporting technique of high
The artificial neutral network(ANN) has the ability that self-study and self-remember, its 3 layers BP network has been applied extensively, but sometimes because of serious multi-correlation between the variables, and a few observations while many variab
The impact on these water bodies of the surrounding coal production activities and the power plant through research the content and characteristics of harmful trace elements in coal contained in these water bodies. F, Hg, Se and As these four trace ele-me
According to the characteristic of clay aquiclude of overburden, the propersimulation materials and proportions of mixture for simulating the plastic clay aquicludelayers were developed, and the plastic similarity conditions were setup. Thus, the simili-t