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某污水處理工程氧化溝工藝的可研報告-wenkub

2022-08-29 23:12:06 本頁面
 

【正文】 ng all the time. Brasilia has quickly established itself as the capital of the country. The idea to have the capital moved so far inland will have a great effect on the future of Brazil.Lesson89 A slip of the tongue 口誤Lesson88 Trapped in a mine 困在礦井里clock train did not run at all. It broke down at Ferngreen station and was taken off the line.39。I suggest,39。39。39。 I suppose it would, but I never catch a later train.39。39。 answered the man.39。Do you always catch such an early train ?39。At the time the murder was mitted, I was travelling on the o39。free rides39。 I know,39。 I told you yesterday and the day before yesterday,39。Lesson83 After the elections 大選之后fish was caught near Madagascar. A small fishingboat was carried miles out to sea by the powerful fish as it pulled on the line. Realizing that this was no ordinary fish, the fisherman made every effort not to damage it in any way. When it was eventually brought to shore, it was found to be over thirteen feet long. It had a head like a horse, big blue eyes, shining silver skin, and a bright red tail, The fish, which has since been sent to a museum where it is being examined by a scientist, is called an oarfish. Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.The former Prime Minister, Mr Wentworth Lane, was defeated in the recent elections. He is now retiring from political life and has gone abroad. My friend, Crawley, has always been a fanatical opponent of Mr Lane39。 he shouted, 39。 answered Crawley,39。 to people on their way to work. This will relieve pressure on the trains to some extent. Meanwhile, a number of university students have volunteered to drive buses while the strike lasts. All the young men are expert drivers, but before they drive any of the buses, they will have to pass a special test. The students are going to take the test in two days39。Lesson85 Never too old to learn 活到老學到老clock train to London,39。 asked the inspector. I must be at work at o39。 Would a later train get you to work on time ?39。39。And you didn39。 Of course not.39。 said the inspector, 39。Six men have been trapped in a mine for seventeen hours. If they are not brought to the surface soon they may lose their lives. However, rescue operations are proving difficult. If explosives are used, vibrations will cause the roof of the mine to collapse. Rescue workers are therefore drilling a hole on the north side of the mine. They intend to bring the men up in a special capsule. If there had not been a hard layer of rock beneath the soil, they would have pleted the job in a few hours. As it is, they have been drilling for sixteen hours and they still have a long way to go. Meanwhile, a microphone, which was lowered into the mine two hours ago, has enabled the men to keep in touch with the closest relatives. Though they are running out of food and drink, the men are cheerful and confident that they will get out soon. They have been told that rescue operations are progressing smoothly. If they knew how difficult it was to drill through the hard rock, they would lose heart. People will do anything to see a free showeven if it is a bad one. When the news got round that a variety show would be presented at our local cinema by the P. and U. Bird Seed Company, we all rushed to see it. We had to queue for hours to get in and there must have been several hundred people present just be fore the show began. Unfortunately, the show was one of the dullest we have ever seen. Those who failed to get in need not have felt disappointed as many of the artistes who should have appeared did not e. The only funny things we heard that evening came from the advertiser at the beginning of the programme. He was obviously very nervous and for some minutes stood awkwardly before the microphone. As soon as he opened his mouth, everyone burst out laughing. We all know what the poor man should have said, but what he actually said was: 39。 I don39。I enjoy cleaning windows at night.39。 answered the policeman in the same tone. 39。39。You see, I39。Your what ?39。 I shouted.39。When the Ambassador of Escalopia returned home for lunch, his wife got a shock. He looked pale and his clothes were in a frightful state. 39。A fireextinguisher, my dear,39。39。The fire broke out in the basement. I went down3 項目建設的必要性 完善城鎮(zhèn)基礎設施建設的需要1) 現有排水系統(tǒng)不完善某區(qū)經多年的建設,市政排水管道建設有了較大發(fā)展,但普遍存在排水管道系統(tǒng)不完善的狀況,現有主城區(qū)排水體制為合流制,有的地方干管缺少支管,有些地方有支管缺少干管,造成管道系統(tǒng)不配套、排水管網密度較小、不敷使用的情況。此外,在開發(fā)建設過程中,私自占用城市下水道位置或在下水道上修建房屋,甚至毀壞城市排水設施,迫使順自然地形條件、自然水力條件設置的城市排水溝渠改道等現象也屢有發(fā)生。 保護城區(qū)水體水質和生態(tài)環(huán)境的需要某區(qū)的發(fā)展以生態(tài)環(huán)境為根本,對環(huán)境保護尤為重要。根據某市人民政府發(fā)布的《某市湘江流域水污染綜合整治實施方案》(岳政發(fā)[2008]22 號)要求“以城鎮(zhèn)環(huán)境基礎設施建設為重點,全面提高生活污水處理率”,“到2010 年,湘江流域我市段縣城都要建成生活污水處理設施,市城區(qū)和縣城污水處理率分別達到80%和50%以上。某區(qū)污水處理工程的建設,不僅有利于城區(qū)內部環(huán)境的改善,也有利于周邊環(huán)境質量的改善,對于保護某區(qū)生態(tài)環(huán)境,保護人民的身體健康,發(fā)展生產力都有重要意義。4 建設規(guī)模 城鎮(zhèn)總體規(guī)劃分析 城鎮(zhèn)發(fā)展趨勢分析城市市政公共基礎失業(yè)的發(fā)展與整個城市的發(fā)展密切相關,城市污水處理工程是城市建設的基礎設施,應適應城市的發(fā)展,且適當超前。b) 加強污水治理,逐步完善污水系統(tǒng),嚴格保護湘江水體。3) 污水系統(tǒng)規(guī)劃a) 污水治理的基本要求城市生活污水以集中處理為主,工業(yè)區(qū)的工業(yè)廢水先預處理再集中處理,經治理的工業(yè)廢水必須符合國家現行排放標準方可排入城市下水道。據此,本可行性研究認為,某區(qū)污水處理工程的設計年限應與規(guī)劃設計年限一致,預測年限以2008 年為基準年,近期確定為2011 年,2020 年作為遠期年限。今后幾年,隨著某區(qū)經濟社會快速發(fā)展,城鎮(zhèn)基礎設施條件及外部交通條件和投資環(huán)境的改善,城鎮(zhèn)建設將得到飛速發(fā)展;伴隨著未來長岳高速公路、長湘延伸公路、杭瑞高速公路復線和推山咀深水碼頭等重大基礎設施的建設,以及國家積極推進城鎮(zhèn)化的發(fā)展戰(zhàn)略的實施和“兩型社會”改革試驗區(qū)的實踐,可以預計,未來某區(qū)某鎮(zhèn)城鎮(zhèn)建設發(fā)展將進入一個新的高峰時期,因此城鎮(zhèn)化水平將會大幅度的提高,大量的農村人口將轉移到城鎮(zhèn),也將促進城鎮(zhèn)人口的增加。n式中:Pt——預測目標年末人口規(guī)模;P0——預測基準年人口規(guī)模;r——人口年均綜合增長率;n——預測年限。某區(qū)某鎮(zhèn)需水量預測力求符合城市用水的實際情況,建立在城鎮(zhèn)建設和工業(yè)發(fā)展規(guī)劃的基礎上,合理地分析當地水資源、水環(huán)境質量和用水習慣,工業(yè)結構以及及其鄰近地區(qū)城鎮(zhèn)供水經驗,采用適當方法,確定合適的用水指標,進行用水量預測。根據《城市給水工程規(guī)劃規(guī)范》以及某鎮(zhèn)供水現狀,參考周邊類似縣市,綜合確定2011 年人均綜合用水量為360L/,用水普及率90%,2020 年人均綜合用水量為500L/,用水普及率95%。1) 生活用水量根據《城市給水工程規(guī)劃規(guī)范》(GB5028298)確定生活用水量定額為240L/~450L/。3) 澆路、綠化用水量城市道路、綠化面積用水量類比其他城市,按其用水量占生活用水的的10%考慮。根據《室外排水設計規(guī)范》,居民生活污水定額和綜合生活污水定額應根據當地采用的用水定額,結合建筑物內部給排水設施水平和排水系統(tǒng)普及程度等因素確定,可按當地用水定額的80%~90%采用,考慮到某鎮(zhèn)污水收集系統(tǒng)工程具有一個逐步形成規(guī)模的過程,用截污系數體現收集污水量的百分比,截污系數以2011 ,2020 計算。6 污水處理廠設計進、出水水質 設計進水水質污水處理廠對污染物質的處理程度可以通過進水水質、水量,以及受納水體的功能、環(huán)境容量確定,從而確定與之相適應的處理工藝,獲得最為經濟的工程建設方案,最大限度降低污水廠投資和運行費用。結合具體情況預測如下, 。 設計進水水質數據表項目pHCODCrmg/LBOD5mg/LSS
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