【正文】 akes the urban environment deteriorates seriously. As a result, the ground water of the city is inevitably contaminated and the agriculture and people’s life in the downstream areas are affected, too. The ecological environment is being threatened, which makes one of the priorities to dispose of the wastewater and sewage. And the establishment of the wastewater treatment plant can tackle the serious ， Water resources ensure the sustaining development of economy. Sewage discharged at random or half treated can expose serious pollution to the water resources. This design topic for YiDouShi sewage treatment plant preliminary design. The project of sewage is mainly posed of urban industrial wastewater and public buildings and urban life of water with water. Its mix of sewage recent average day for Q = design flow rate of 30000 m3 / d, total change coefficient for K = feed water quality as follows: COD = 300 mg/l, SS = 180 mg/l, BOD5 = 1660 mg/l, TN = 25 mg/l, TP = 2 mg/l waterquality and conform to the national level 1 B emissions standards. This design, the A2O system to deal with the urban sewage. Deal with the main structures have hydrocyclone sink sand pool, A2O system, the second pond, etc, the main structures A2O system is used to denitrification and phosphorus, this system has the anaerobic, good oxygen, hypoxia three stages. The system has high efficiency, energy saving, the characteristics of impact resistance and high load, and the effluent water quality good. Keywords: economic energy saving aeration pool / 48 4 目錄 1 總論 .................................................... 6 設(shè)計任務(wù)和內(nèi)容 ............................................................................................................... 6 地質(zhì)地貌 ......................................................................................................................... 6 2 基本資料 .............................................. 6 城市性質(zhì)與規(guī)模 ................................................................................................................ 6 自然條件 ......................................................................................................................... 7 3. 污水處理廠設(shè)計條件 ........................ 8 設(shè)計規(guī)模 ......................................................................................................................... 8 設(shè)計污水水質(zhì) .................................................................................................................. 8 設(shè)計出水水質(zhì) .................................................................................................................. 9 廠址選擇 ......................................................................................................................... 9 受納水體與排水出路 ...................................................................................................... 10 污泥出路 ....................................................................................................................... 10 ............................................................................................................ 10 污泥處置 ................................................................................................................... 11 4 污水處理工藝流程說明 .................. 11 工藝流程的確定 .............................................................................................................. 11 構(gòu)筑物的選擇 ................................................................................................................. 12 5 處理構(gòu)筑物設(shè)計 ............................. 14 粗格柵 ........................................................................................................................... 15 污水提升泵房 ................................................................................................................. 17 細格柵計算： ................................................................................................................. 19 沉砂池 ............................................................................................................................ 20 / 48 5 旋流沉砂池 ................................................................................................................... 20 配水井 ............................................................................................................................ 21 配水井設(shè)計 ................................................................................................................ 21 初沉池 ......................................................................................................................... 21 曝氣池 ......................................................................................................................... 23 二沉池 ......................................................................................................................... 29 濃縮池及污泥脫水 ......................................................................................................... 35 接觸消毒池 ................................................................................................................... 40 加氯間 .......................................................................................................................... 42 6 污水廠總體布置 ................................ 43 6 .1 主要設(shè)備說明 ................................................................................................................ 43 主要構(gòu) (建 )筑物與附屬建筑物 .......................................................................................... 45 污水廠平面布置 ............................................................................................................. 46 污水處理構(gòu)筑物高程布置 ................................................................................................ 46 7 設(shè)計體會 ..