【正文】 本科畢業(yè)設計（論文） 1 摘 要 西安市西南郊地區(qū)的工業(yè)生產廢水和居民生活污水其混合比例為 7:3，其廢水水質的主要特點是含有大量的有機物，屬高濃度有機廢水，故其生化需氧量也較大。該混合廢水的 處理廠的處理水量為 15 萬 3/md，原混合廢水中各項指標為： BOD 濃度為 180 /Lmg ,COD 濃度為 400 /Lmg ， SS 濃度為 255 /Lmg ，氨氮濃度為 32 /Lmg 。 經分析知該處理水質屬易生物降解，且需要二級出水經深度處理， 可采用生物處理使水 達到工業(yè)回用水標準，以緩解城市 供水 矛盾 。故本設計工藝流程為：污水 → 粗 格柵 → 集水井及提升泵房 → 細格柵 → 曝氣沉砂池 → 選擇 池 → 氧化溝 → 二沉池 → 接觸消毒 池 → 出水 整個工藝具有總投資小、處理效果好、 工藝簡單、 易于管理、 運行穩(wěn)定、能耗小等優(yōu)點。處理 后 的回用水可達到 國家二級排放標準經深度處理后 的 水質如下 ，即： 5BOD 濃度 ≤20 /Lmg ,COD 濃度 ≤100 /Lmg ， SS 濃度 ≤20 /Lmg ，氨氮濃度 ≤15/Lmg 。 關鍵字： 工業(yè) 廢水， 污水處理廠， 氧化溝 ，生活污水 本科畢業(yè)設計（論文） 2 ABSTRACT Xi39。an city southwest suburbs 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 400 mgL ,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)設計（論文） 3 目 錄 前 言 ...................................................................................................................... 5 第 1 章 設計說明書 .............................................................................................. 7 設計題目 .................................................................................................. 7 設計任務 .................................................................................................. 7 設計原始資料及內容 .............................................................................. 7 設計要求 .................................................................................................. 7 進出水水質要求 ........................................................................... 7 處理程度要求 ............................................................................... 8 工藝選擇 .................................................................................................. 9 工藝流程 ................................................................................................ 12 主要構筑物設計說明 ............................................................................ 12 粗格柵 ......................................................................................... 12 集水井及提升泵房 ..................................................................... 13 細格柵 ......................................................................................... 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 污泥脫水機房 ........................................................................... 20 第 2 章 計算說明書 ............................................................................................ 22 基礎計算 ................................................................................................ 22 粗格柵 .................................................................................................... 22 集水井和提升泵房 ................................................................................ 25 集水井設計計算 ......................................................................... 25 水泵設計計算 ............................................................................. 26 細格柵 .................................................................................................... 27 本科畢業(yè)設計（論文） 4 曝氣沉砂池 ............................................................................................ 30 設計參數： ................................................................................. 30 設計計算 ..................................................................................... 30 DE 型氧化溝 ......................................................................................... 32 設計參數 ..................................................................................... 32 設計計算 .................................................................................... 33 二沉池（輻流式沉淀池） .................................................................... 40 設計參數 ..................................................................................... 40 設計計算： ................................................................................. 40 接觸消毒池 ............................................................................................ 43 消毒劑的投加 ..........................................