日处理6万立方米城市生活污水工艺设计毕到业设计说明书.doc

PAGE i 设计总说明 我国水体污染主要来自两方面，一是工业发展超标排放工业废水，二是城市化中由于城市污水排放和集中处理设施严重缺乏，大量生活污水未经处理直接进入水体造成环境污染。工业废水近年来经过治理虽有所减少，但城市生活污水有增无减，占水质污染的51%以上。 本设计要求处理水量为60000m3/d的城市生活污水，设计方案针对已运行稳定有效的A2/ O活性污泥法工艺处理城市生活污水。A2O工艺由于不同环境条件，不同功能的微生物群落的有机配合，加之厌氧、缺氧条件下，部分不可生物降解的有机物（CODNB）能被开环或断链，使得N、P、有机碳被同时去除，并提高对CODNB的去除效果。它可以同时完成有机物的去除，硝化脱氮、磷的过量摄取而被去除等功能，脱氮的前提是NH 关键词：城市生活污水、传统活性污泥法、A2/ O General Design Direction Sewage in China is mainly come from two aspect: the industrial sewage and the municipal.，the aquicolous environment was polluted due to plenty of raw waste water discharge into the river. This is a design about the sewage treatment plant. According to the primitive data of the graduation project and demanding for water quality : Namely require the denitrification and phosphorus removal to reach the second class discharge standard. A2/O craft is chose In preliminary treatment, the original water enters coarse screening in order to remove heavy solides and floatable material, in case that it influences the working of the following treatment and the pipeline .And then wastewater is promoted into the medium screening by pump.after that it enters the laminar flow sand pool , it is used to remove bigger inorganic sand of heavy density, by this way,the density of organic material in mud can be improved .The above-mentioned sewage disposal is the physical disposal stage,it’s same to the two major craft . Now make a brief instruction of theiological disposal parts of these two major crafts separately.After finishing calculation of design , according to principle of laying, consider the factors synthetically to confirm the place of the sewage factory. According to flow volume of sewage we can select the foot-path , confirm the velocity of flow and water conservancy slope , then calculate water conservancy losses. Key word: A2/O Munici[pal Sewage Treatment Sludge treatment PAGE II 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc200707645 1 绪论 PAGEREF _Toc200707645 \h 1 HYPERLINK \l _