【正文】 urbs area of the industrial wastewater and urban sewage and its mixing ratio of 7:3, the wastewater is characterized by containing large amounts of anic matter, high concentration anic wastewater, therefore its biochemical oxygen demand is large. The mixed wastewater treatment plant processing quantity is 150000 3/md， , the original mixing wastewater indicators: the concentration of BOD is 180 /Lmg , the concentration of COD is 400mgL ,the concentration of SS is 255 /Lmg , the concentration of ammonia nitrogen is 32 /Lmg . Through the analysis of the processing quality is easily biodegradable, and requires two stage effluent treatment using biological treatment, the water to reach the industrial reuse standard, to alleviate the contradiction of city water supply. The technological process of this design is: Sewage→ Thick grille → Set well and lift pump house→ Fine grille →Aeration sink sand pool → Anaerobic pond→Oxidation ditch→Two sink the pond →Contact oxidation pond→Effluent water The whole process has small total investment, good treatment effect, simple process, easy control, stable operation, low energy consumption. Treated wastewater can be reused to two national emission standards after advanced treatment can reach the standard, That is the concentration of BOD is less than 20, the concentration of COD less than 100, the concentration of SS is less than 20, ammonia concentration is less than 15. KEY WORDS : anic wastewater, sewage treatment plant, oxidation ditch, process design 本科畢業(yè)設(shè)計(jì)（論文） 3 目 錄 前 言 ...................................................................................................................... 5 第 1 章 設(shè)計(jì)說(shuō)明書 .............................................................................................. 7 設(shè)計(jì)題目 .................................................................................................. 7 設(shè)計(jì)任務(wù) .................................................................................................. 7 設(shè)計(jì)原始資料及內(nèi)容 .............................................................................. 7 設(shè)計(jì)要求 .................................................................................................. 7 進(jìn)出水水質(zhì)要求 ........................................................................... 7 處理程度要求 ............................................................................... 8 工藝選擇 .................................................................................................. 9 工藝流程 ................................................................................................ 12 主要構(gòu)筑物設(shè)計(jì)說(shuō)明 ............................................................................ 12 粗格柵 ......................................................................................... 12 集水井及提升泵房 ..................................................................... 13 細(xì)格柵 ......................................................................................... 14 曝氣沉砂池 ................................................................................. 15 DE 型氧化溝 .............................................................................. 15 二沉池 ......................................................................................... 17 污泥泵房 ..................................................................................... 19 污泥濃縮池 ................................................................................. 19 污泥脫水機(jī)房 ........................................................................... 20 第 2 章 計(jì)算說(shuō)明書 ............................................................................................ 22 基礎(chǔ)計(jì)算 ................................................................................................ 22 粗格柵 .................................................................................................... 22 集水井和提升泵房 ................................................................................ 25 集水井設(shè)計(jì)計(jì)算 ......................................................................... 25 水泵設(shè)計(jì)計(jì)算 ............................................................................. 26 細(xì)格柵 .................................................................................................... 27 本科畢業(yè)設(shè)計(jì)（論文） 4 曝氣沉砂池 ............................................................................................ 30 設(shè)計(jì)參數(shù)： ................................................................................. 30 設(shè)計(jì)計(jì)算 ..................................................................................... 30 DE 型氧化溝 ......................................................................................... 32 設(shè)計(jì)參數(shù) ..................................................................................... 32 設(shè)計(jì)計(jì)算 .................................................................................... 33 二沉池（輻流式沉淀池） .................................................................... 40 設(shè)計(jì)參數(shù) ..................................................................................... 40 設(shè)計(jì)計(jì)算： ................................................................................. 40 接觸消毒池 ............................................................................................ 43 消毒劑的投加 ............................................................................. 43 平流式接觸消毒池 ..................................................................... 44 污泥泵房 ................................................................................................ 46 集泥池的設(shè)計(jì)計(jì)算 ..................................................................... 46 回流污泥泵的選型 ..................................................................... 47 剩余污泥泵的選型 ..................................................................... 47 污泥濃縮池 .......................................................................................... 47 污泥脫水機(jī)房 ............................................