【正文】 tralized management, greatly improved the control process in the safety and stability. At the same time adopted the SBR, intermittent activated sludge wastewater treatment. And according to the method of SBR sewage treatment process for the selection of the sensor and the automatic control program written for process flow diagram of each sewage treatment section and the corresponding PLC. Key words: Sewage treatment process The SBR method PLC III 目 錄 摘 要 ......................................................................................................................... I ABSTRACT ............................................................................................................... II 第 1 章 緒論 .............................................................................................................. 1 本設(shè)計(jì)的研究背景與意義 ........................................................................... 1 本 設(shè)計(jì)的研究背景 ............................................................................... 1 本設(shè)計(jì)研究的意義 ............................................................................... 1 國內(nèi)外污水處理控制現(xiàn)狀 .......................................................................... 2 第 2 章 污水處理系統(tǒng)的工藝及主要構(gòu)筑物 ......................................................... 5 污水處理工藝 ............................................................................................... 5 間歇式活性污泥法（ SBR）介紹 ......................................................... 6 SBR 工藝的基本原理 ............................................................................ 7 SBR 工藝的技術(shù)特征 ............................................................................ 8 溶解氧在 SBR 法中的作用 ................................................................. 9 污水處理系統(tǒng)的主要構(gòu)筑物 ...................................................................... 9 污水一級處理（污水預(yù)處理） ......................................................... 10 污水二級處理（生物處理） ..............................................................11 污泥處理 .............................................................................................. 12 污水處理自控過程和監(jiān)控系統(tǒng)的作用 ..................................................... 13 污水處理自動控制過程 ..................................................................... 13 監(jiān)控系統(tǒng)的作用 ................................................................................. 14 第 3 章 硬件部分設(shè)計(jì) ............................................................................................ 17 PLC 工作原理及特點(diǎn) ................................................................................. 17 西門子 PLC ................................................................................................ 18 PLC 內(nèi)部各模塊選型 .......................................................................... 20 IV PLC I/O 分配 ........................................................................................ 21 部分電路設(shè)計(jì) ............................................................................................. 23 主回路硬件設(shè)計(jì) ................................................................................. 23 S7300 數(shù)字量輸入模塊原理圖 ......................................................... 25 S7300 數(shù)字量輸出模塊原理圖 ......................................................... 28 S7300 模擬量輸入模塊原理圖 ......................................................... 30 手 /自動控制電路接線方式 ............................................................... 31 傳感器的選擇 ............................................................................................. 33 液位傳感器的選擇 ............................................................................. 34 PH 傳感器的選擇 ................................................................................ 37 DO 儀的選擇 ........................................................................................ 37 第 4 章 PLC 的程序設(shè)計(jì) ....................................................................................... 39 PLC 控制系統(tǒng)設(shè)計(jì)的基本步驟 ................................................................. 39 PLC 程序自動控制部分程序設(shè)計(jì) ............................................................ 40 預(yù)處理區(qū) PLC 控制程序 .................................................................... 40 曝氣沉淀池 PLC 控制程序 ................................................................ 44 污泥處理池 PLC 控制程序 ................................................................ 46 結(jié) 論 ......................................................................................................................... 48 致 謝 ...................................................................................................................... 49 參考文獻(xiàn) .................................................................................................................. 50 附 錄 ......................................................................................................................... 52 V CONNECTS ABSTRACT.............................................................................. 錯(cuò)誤 !未定義書簽。 Chapter 1 Introduction........................................................... 錯(cuò)誤 !未定義書簽。 The Research Background Of This Design .......... 錯(cuò)誤 !未定義書簽。 Domestic Sewage Treatment Control Status ............... 錯(cuò)誤 !未定義書簽。 Sewage Treatment Process ........................................... 錯(cuò)誤 !未定義書簽。 The Basic Principles Of The SBR Process ............................................ 7 The Technical Features Of The SBR Process ...... 錯(cuò)誤 !未定義書簽。 Primary Treatment (Sewage Pretreatment) ......................................... 10 Of Secondary Sewage Treatment (Biological Treatment)錯(cuò)誤 !未定義書簽。 Automatic Control Process And The Function Of Monitoring System錯(cuò)誤 !未定義書簽。 The Role Of Monitoring And Control System ..... 錯(cuò)誤 !未定義書簽。 VI PLC Working Principle And Characteristics .............. 錯(cuò)誤 !未定義書簽。 Inside The PLC Module Selection .......................