1、建筑设备给排水（国外英文资料）.doc

1、建筑设备给排水 Water source type 1. Groundwater A. water quality is clean; B. water temperature is stable; C. is easy to use; D. water is small; reserves are limited; e. is not renewable in a short time; if excessive mining will lead to subsidence of the ground. 2, surface water A. water is large; B. is renewable; it is not easy to cause environmental problems; C. water quality is poor; D. water temperature varies with seasons; e. is inconvenient to select. 3. Selection of water sources Water quality, water quantity and water source protection are easy to be implemented. Two. Water intake works 1 groundwater intake structures 1) wells: geographical area rich in water, deep water, deep water pump 2) wells: shallow groundwater (within 30 meters deep) 3) Seepage Canal: the river, the reservoir under the water or on the shore, laying pipe network, collecting underground seepage water, buried 3~5 meters 2. water intake structures 1) fixed water intake structure. It is a permanent water intake facility Large water intake, reliable water intake and convenient maintenance Large investment, complex engineering The water level changes little. 2. movable water intake structure The fluctuation level of water source level is large, and the water quantity is relatively small Small investment, fast construction and strong adaptability Three, water purification process 1): mixed coagulation flocculation, adding some coagulant to water (Ming Fan, ferrous sulfate, etc.) through its hydrolysis product and water particles together to make the knot, adsorption, particle formation, and then through the flocculation formation of large flocs, which is conducive to precipitation; 2) sedimentation: the process of separating suspended matter from water by gravity. In practice, a sedimentation tank is used to realize this process; 3) filtration: The precipitated water passes through the quartz sand layer in the filter, and the suspended impurities in the water are intercepted by the sieve, filterin