【正文】 來越突出。尤其是水資源方面，對水質(zhì)的要求和水質(zhì)的現(xiàn)狀產(chǎn)生了不可協(xié)調(diào)的矛盾， 對國民經(jīng)濟的發(fā)展和國民生活水平的提高形成了極大地制約， 故而加快改進城鄉(xiāng)排水體制和修建污水處理廠應 日益 引起重視?；趯ι鲜鰡栴}的分析探討，提出了雨污分流式排水體制， 這種體制可以減少對環(huán)境污染，減少污水處理廠的規(guī)模，并可根據(jù)實際情況靈活改變， 雨水管依地形就近排水，污水管則收集城區(qū)生活污水和達到排入下水道水質(zhì)要求的工業(yè)廢水，進而由污水主干管輸送至污水處理廠 進行處理。 關鍵 詞 排水工程；分流式； A2/O同步脫氮除磷工藝四川大學本科畢業(yè)設計 金堂縣縣城排水工程設計 II The drainage design of Jintang County Major Water Suply and Discharge Engieering Abstract: With the rapid development of China39。s living standards had greatly restricts the formation, and therefore speed up the improvement of drainage system and construction of urban sewage treatment plant should be increasing attention. Jintang County, located northwest of Chengdu, is an important industrial, food area, the city lags behind the existing drainage system, which greatly restricted the appearance and further development of county planning. Based on the analysis of these issues discussed, the rain and sewage drainage system of distributary is e up with. This system can reduce the environmental pollution, reduce the size of the sewage treatment plant, and also is flexible to change according to actual conditions. According to the terrain nearby storm sewer drainage, sewage pipe is collection of urban sewage discharged into the sewers and meet the requirements of industrial waste water, and then transported to the main pipe from the sewage treatment plant for processing. As Jintang County District sewage nitrogen and phosphorus content is high, therefore should be taken to better effect than nitrogen and phosphorus removal process. Integrated the advantages and disadvantages of various activated sludge, using A2 / O simultaneous nitrogen and phosphorus removal process is reasonable. The process has process is simple, low cost infrastructure, saving pharmaceutical costs, the sludge generated by high stability, without digestion can be delivered to the dehydration between dehydration. Key words drainage works。 A2 / O simultaneous nitrogen and phosphorus removal process 四川大學本科畢業(yè)設計 金堂縣縣城排水工程設計 III 目 錄 摘要 ....................................................... I Abstract ................................................... II 第 1 章 緒論 ............................................... 1 概述 ...................................................... 1 城市概況 ........................................................... 1 設計目的 ........................................................... 1 設計任務及要求 ..................................................... 1 設計資料 .................................................. 2 城市規(guī)劃資料 ....................................................... 2 水文水質(zhì)資料 ....................................................... 2 地質(zhì)資料 ........................................................... 3 氣象資料 ........................................................... 3 污水量資料 ......................................................... 3 現(xiàn)有地面覆蓋種類資料 ............................................... 4 現(xiàn)有給排水狀況 ..................................................... 4 其他資料 ........................................................... 4 第 2 章 排水管網(wǎng)的規(guī)劃設計 ................................. 4 城市排水管網(wǎng)定線原則 ...................................... 4 排水工程規(guī)劃設計的基本原則 ......................................... 4 排水管網(wǎng)的管道定線原則 ............................................. 5 排水體制的確定及區(qū)域劃分 ................................... 5 排水體制的確定 ..................................................... 5 排水區(qū)域的劃分 ..................................................... 8 排水系統(tǒng)的布置形式 ........................................ 8 污水設計流量的計算 ........................................ 9 劃分設計管段 ....................................................... 9 計算設計流量 ....................................................... 9 污水管網(wǎng)的水力計算 ........................................ 10 水力計算的基本公式 ................................................ 10 污水管道水力計算的設計數(shù)據(jù) ........................................ 11 污水管道水力計算時應注意的問題 .................................... 12 第 3 章 雨水管渠設計 ...................................... 12 雨水管渠平面布置的主要內(nèi)容 ............................ 12 四川大學本科畢業(yè)設計 金堂縣縣城排水工程設計 IV 雨水管渠系統(tǒng)設計的基本原則 ................................. 12 雨水管渠設計流量的確定 .................................... 14 徑流系數(shù)ψ的確定 .................................................. 14 設計重現(xiàn)期 P的確定 ................................................ 14 集水時間 t 的確定 .................................................. 14 暴雨強度公式的確定 ................................................ 15 雨水管渠設計流量計算公式 .......................................... 16 雨水管 渠的水力計算 ........................................ 16 雨水管渠水力計算的設計數(shù)據(jù) ........................................ 16 第 4 章 污水泵站的設計 .................................... 17 綜述 ...................................................... 17 設計說明 .................................................. 17 第 5 章 污水處理廠設計初步 ................................ 18 設計方案的選擇 ............................................ 18 金堂縣污水水質(zhì)狀況 ................................................ 18 各處理工藝比較 .................................................... 18 污水量及污水處理程度的計算 ................................. 20 污水量的計算 ...................................................... 20 污水處理程度的計算 ................................................ 21 第 6 章 污水的一級處理 .................................... 23 粗格柵 .................................................... 23 沉砂池 .................................................... 23 概述 .............................................................. 23 設計說明 .......................................................... 24 初次沉淀池 ...............