水质污染

Analyses of the water quality variation show that aquiculture is a main source of organic pollution, and the growth of the urban population is the main reason for nutrient pollution.

分析总结了水质污染变化原因，指出衡阳市养殖业的发展成为衡阳段有机污染的重要来源之一，城镇人口增加是营养型污染增加的主要原因。

The rotation,detergence,and valve switching of the water-filter system are full-automatically controlled and, besides,the filter can well deal with the damage of generator set caused by sewage.

本文采用PLC实现新型滤水器，在旋转、排污、开关阀方面实现了全自动控制，并很好地解决了因水质污染对电厂发电机组带来的危害，克服了国内其它形式的滤水器无法解决的有机物过滤排污问题。

The oil sewage disposed process is a complex disposal technique. The disposal process is more difficult for the change of PH Flux temperature of raw water and the other polluted quality. At present the disposed water by the system of oil of sewage is unstable and high cost. Now the method for the oil of sewage have physics chemistry physical chemistry and biology etc. In the every disposed method has its own specially, Basis of the oil sewage condition of power plant. The text use chemic method. Another word is method of Flocculation-deposition. Injecting Dosage into sewage. Making small suspends grain and the electrophorus colloid gather into bigger colloid and deposit. Separated it from water and purify the oil sewage. Make disposed oil water up to grade.

含油污水处理工艺是一个复杂的处理过程，在处理过程中由于受到原水浊度、PH值、配水流量、原水温度和其他水质污染等因素的影响，处理难度相当大，现时的含油污水处理系统普遍存在处理后的水质不稳定和处理成本高等问题，国内外含油污水处理采用的方法有物理法、化学法、物理化学法和生物法等，每种处理方法都有自己的特点，结合电厂含油污水的情况，本文主要采用化学法，具体来说是采用絮凝沉淀的方法，通过向废水中投加混凝剂，使细小的悬浮颗粒和带电胶体微粒聚集成较大颗粒而沉淀，使其与水分离，使含油污水得到净化，使处理后的废水各项指标达到排放标准。

Droughts and floods that affect the efficiency of the irrigation system, continuing changes in land use, and the potential of water pollution from intensive agriculture pose a range of problems that require innovative tools for their solution.

旱灾和水灾影响效率的灌溉系统，不断转变，土地利用，以及潜在的水质污染的集约农业构成了一系列的问题需要的创新工具为他们的解决办法。

Platypus to water pollution is very sensitive, not only to live in contaminated freshwater.

鸭嘴兽对水质污染非常敏感，只生活于没有污染的淡水中。

With the speedy development of city economy, constant rising of population and swiftness of citified process, geological issue of city environment becomes more extrusive and the problem of city water supply and need and groundwater pollution becomes more and more serious.

随着城市经济的迅速发展、人口的不断增长和城市化进程的加快，城市环境地质问题日益突出，城市水资源供需问题和地下水水质污染日益严重，水质污染导致了可用水资源量日渐减少，加剧了水资源危机和供需矛盾，直接影响工农业生产，危害生态环境和人类健康。

The nitrogen and pesticide in the topsoil with soil erosion go into river, lake and reservoirs and so on. So that the soil erosion reduced, the nocuous matter loss can be controlled as well, the sediment silt and water pollution in rivers, lakes and reservoirs can be decreased.

土壤中氮和农药等有害物质的流失是以水土流失为载体，进入江河、湖泊、水库等水源地，加大了这些水源地的污染，所以减轻了土壤水土流失量，就能够很好控制农耕地有害物质的流失，减轻江河、湖泊、水库等水源地的泥沙淤积和水质污染。

Water pollution kills our fish and pollutes our drinking water .

水质污染造成的鱼和污染我们的饮用水。

The spatial pattern of watercourses and its water pollution in Shanghai City were analyzed supported with the Geographic Information System, the relationship between the area of polluted watercourses and its landscape metrics was further analyzed.

在GIS支持下，对上海市的河道及其水质污染的空间格局进行分析，并进一步分析了水质污染面积与景观格局指数之间的关系。

Biochemical oxygen demand, BOD is necessary for water quality evaluation.It is an important index in measuring organic materials pollution.

生物化学需氧量BOD是水质评价的必测项目，是衡量有机物对水质污染的重要质量指标。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。