污水(国外英文资料).docVIP

污水(国外英文资料) Drainage network Drainage content 1, the main contents of drainage works Answer: collect a variety of sewage, and timely transport it to the appropriate place, properly treated, discharged or re utilized. 2, the classification of sewage, the final way out of sewage, the way to reuse and its definition Answer: sewage is divided into three categories: living sewage, industrial wastewater, precipitation; the last way out: the discharge of water bodies, irrigation of farmland, repeated use. The mode of repetition, Natural reuse: upstream discharges of sewage and river water are exploited downstream, called natural reuse; Indirect reuse: injecting municipal wastewater into the ground to supplement groundwater as an indirect source of water supply; Direct reuse: city sewage is directly used as the source of urban drinking water, industrial water source, miscellaneous water source, etc.. 4, the layout of drainage system, characteristics and scope of application. Orthogonal arrangement: the length of the dry pipe is short and the pipe diameter is small, so the economy and sewage discharge are also rapid. Nitrogen, which is discharged without treatment, can cause serious pollution to the body and affect the environment. Apply to drain rainwater. Closure arrangement: laying the main pipe along the river bank under the condition of orthogonal arrangement, and intercepting the sewage from each dry pipe to the sewage treatment plant, is of great significance for reducing water pollution, improving and protecting the environment. But when a rainy season, some mixed sewage into the water, will cause water pollution. Applicable to split system sewage treatment system and regional drainage system. The parallel arrangement: dry pipe substantially parallel, and the contour and river trunk pipe and river into a certain angle and contour laying, to avoid dry pipe slope and the flow velocity in the tube due to the large pipeline suffered serious erosion in the slope of the ter