【正文】 ation of functions, so that the water quality of treated effluent in line with the requirements.(Ⅱ) wastewater treatment plant design uses the design parameters must be reliable.(Ⅲ) the design of sewage treatment plants must meet the requirements of the economy. Design is pleted, the overall layout, design and pharmaceutical monomer to the use of as much as possible to take reasonable measures to reduce project cost and operational management costs.山東萊陽市 8 萬 m3污水處理廠設(shè)計（A 2/ O 工藝）第 6 頁 共 88 頁(Ⅳ) sewage treatment plant design should be sought technical reasonable. In the principle of economic rationality, must be based on need, as far as possible the use of advanced technology, machinery and automatic control technology, but to ensure that safe and reliable.(Ⅴ) wastewater treatment plant design should be noted that the bination of near term should not be part of a phased construction, such as the allocation of wells, pumping stations and processing drugs, etc., and its construction should be pleted first。 3139。 5939。 34 39。 52 , that is, the east of Hai Duong City, the west the city of Lacey, the northwest of Zhaoyuan City, the north of Qixia City, the south Jimo City, the southeast corner of the TBay the brink of the Yellow Sea. There are hilly group undulating hills in every direction.Before Laiyang City wastewater treatment plant operation, the Shell River and the City within the urban area of natural drainage is the main river of sewage. The disposal of sewage in 2022 is about 40,000 m3 / d, and 30% of the volume of effluent is discharged into the Shell River, and then 70% of the volume of effluent is discharged into natural drains. Then the effluent can pass natural drainage into the clams in the lower reaches of River City, urban pollution River water by the clams and the five eventually discharged into the Yellow Sea. Before wastewater treatment plant is finished, the pretreated municipal wastewater is discharged directly and seriously affected the quality of drinking water of the river along the river and the fisheries production the lower reaches the entrance of the Yellow Sea. The sewage treatment plant of Laiyang city will be very useful for the protection of the environment, for improving the water quality and ensuring the people39。 , The terrain of factory tilt from north to south is low in southeast and high in the northwest, with an average gradient of the ground is 5 176。. Sewage will be piped to the wastewater treatment plant through the transmission, from a water main pipe whose lowelevation is .(Ⅳ) The river for accepting water The sewage plant effluent is discharged directly into the external Shell River, and its highest level for the year is .Ⅲ.Ⅲ The scale of the plantIn accordance with the overall planning, drainage conditions, forecast and economic development of the volume of effluent to ascertain, the total scale of Laiyang City sewage treatment plant is 80000m3 / d, and its changing factor is . The design of the sewage treatment plant is according to the highest daily maximum flow design, with the implementation in two phases.Ⅲ.Ⅳ The quality of Influent and effluent waterThe quality indicators of Influent and effluent water see the tablel1below:Label1 The quality indicators of Influent and effluent wate山東萊陽市 8 萬 m3污水處理廠設(shè)計（A 2/ O 工藝）第 8 頁 共 88 頁The quality indicators of waterUnitsmg/L COD BOD5 SS TN TPInfluent water 450 200 200 35 effluent water 60 20 20 8 The effluent water of sewage treatment plant treated discharged into the shell river ,but the shell river belong to the functional water Ⅳ, Into its requirements must be met at the time of the water current, Integrated Wastewater Discharge Standard (GB189182022) emission standards for leve l B, （COD ≤60。 SS≤20。 TP≤）. In addition, according to the requirements of Laiyang environments protection Administration as well as the actual situation in Laiyang City , sewage treatment plant effluent water should meet the standards .Ⅳ The wastewater Treatment Process In accordance with the domestic and foreign small and mediumsized sewage treatment that has been in operation survey, to achieve the established treatment objectives, The design can be A2 / O activated sludge process. The design Process Flow Diagram see he picture 1 bellow:Grille Upgrade pumping roomGrit chamberWith wellsPrimary sedimentation tankAnaerobic pondHypoxia poolAerobic pondSecondary sedimentation tankSludge pumping roomSludge thickening tankSludge storage tankSludge dewatering unitContact tankSand—Water SeparationMud cakeSandDrainageSterileInitial sludgeReturn mixtureReturn sludgeOver piperFine grillepicture 1 The design Process Flow Diagram華北科技學(xué)院畢業(yè)設(shè)計第 9 頁 共 88 頁Ⅴ Design resultsThe project treatment structures including midgrille and upgrade pumping, Fine grille and the advectiontype grit chamber, Primary sedimentation tank, A2 / O response pool, secondary settling tank, disinfection contact tanks, sludge thickening tanks, sludge storage tank。31‘ˊ120176。34‘ˊ10”37176。萊陽市區(qū)地勢北高南低，北部、東部、西南部均有山巒起伏的低山丘陵群。2022 年污水排放量約為 4 萬 m3/d,其中 30％的污水量排入蜆河,70％的污水量排入自然排水溝，由自然排水溝在城區(qū)下游匯入蜆河，城市污水經(jīng)蜆河、五龍河最終排入黃海。萊陽市污水處理廠服務(wù)范圍為萊陽市 2022 年總體規(guī)劃范圍、總規(guī)劃用地為29KM2。 背景資料（1）設(shè)計規(guī)模污水設(shè)計流量：Q=80000m 3/d， 流量變化系數(shù)： ?（2）原污水水質(zhì)指標(biāo)進(jìn)水水質(zhì)指標(biāo)見下表：表 111 進(jìn)水水質(zhì)表水質(zhì)指標(biāo) COD BOD5 SS TN TP進(jìn)水（mg/L） 450 200 200 35 （3）出水水質(zhì)指標(biāo)萊陽市污水處理廠處理后的出水排入蜆河，而蜆河為Ⅳ類功能水體，要求排入其內(nèi)的出水必須滿足當(dāng)時現(xiàn)行的《污水綜合排放標(biāo)準(zhǔn)》 （GB189182022）一級 B 排放標(biāo)準(zhǔn)。華北科技學(xué)院畢業(yè)設(shè)計第 11 頁 共 88 頁由此確定污水處理廠最終出水水質(zhì)，出水水質(zhì)見下表：表 111 出水水質(zhì)表水質(zhì)指標(biāo) COD BOD5 SS TN TP出水（mg/L） 60 20 20 8 （4）氣象資料水文① 風(fēng)向 主導(dǎo)風(fēng)向?yàn)闁|南西北風(fēng)。極端氣溫： ℃ ，最高為 ℃ 。③ 場地狀況 污水處理廠擬用場地目前較為平整。廠區(qū)地勢由北向南傾斜，西北高東南低，平均地面坡度為 5176。污水將通過管道通過輸送到污水廠， 。 工藝方案的選擇 水質(zhì)分析本項(xiàng)目污水處理的特點(diǎn)：污水以有機(jī)污染物為主，BOD/COD=，可生化性較好，采用生化處理最為經(jīng)濟(jì)。TOP/BOD 5=＜，滿足生物除磷的條件。對脫磷或脫氮有要求的城市，應(yīng)采用二級強(qiáng)化處理，如 工藝，A/