本文關(guān)鍵詞：機(jī)械絮凝斜管沉淀池沉淀區(qū)數(shù)值模擬與試驗研究　出處：《揚州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 機(jī)械絮凝 斜管沉淀 三維數(shù)值模擬 沉淀區(qū)優(yōu)化設(shè)計 活性污泥回流

【摘要】：高密度沉淀凈水工藝是集絮凝、沉淀、污泥濃縮于一體的新型水處理技術(shù),具有占地面積小,處理效率高的優(yōu)點,已得到廣泛應(yīng)用。目前,國內(nèi)采用高效沉淀池工藝的水廠有50多座,總供水量超過1500萬m3/d,已建項目大多是借鑒了國外高密度沉淀池的形式,并在參考機(jī)械攪拌絮凝和斜管沉淀工藝經(jīng)驗基礎(chǔ)上開展設(shè)計的,國家沒有相應(yīng)的設(shè)計規(guī)范。沉淀池的結(jié)構(gòu)設(shè)計更多是滿足工藝流程需要,在絮凝和沉淀水力條件上考慮較少。 本文以揚州市第一水廠改擴(kuò)建工程中采用的機(jī)械絮凝斜管沉淀池為對象,采用數(shù)值模擬和中試研究相結(jié)合的方法,對沉淀池的顆粒濃度和流場進(jìn)行模擬,提出了優(yōu)化設(shè)計的改進(jìn)措施,中試研究明確了各項運行參數(shù)。主要得出以下結(jié)論： (1)通過對沉淀區(qū)污泥顆粒濃度場的數(shù)值模擬,結(jié)果表明最佳顆粒密度為1050kg/m3,過高的顆粒密度會加劇異重流現(xiàn)象,過小則影響沉淀效率。 (2)對不同進(jìn)水口高度以及在沉淀區(qū)前增設(shè)配水槽效果進(jìn)行模擬。在保持沉淀區(qū)進(jìn)水口寬度不變,當(dāng)進(jìn)水口高度為1.2m,即進(jìn)水速度為0.024m/s時,流場分布更加均勻；在沉淀區(qū)前增設(shè)配水槽,可使進(jìn)水沿池寬方向分布均勻,提高了水流穩(wěn)定性,更有利于顆粒沉降和污泥濃縮。 (3)研發(fā)了水量為2000m3/d的中試裝置,通過燒杯實驗和中試試驗,對混凝劑投加量、助凝劑投加量、污泥回流比等控制參數(shù)進(jìn)行了優(yōu)化試驗,探索針對第一水廠原水條件下的最佳運行參數(shù)。結(jié)果表明,當(dāng)PAC投加30mg/L、PAM投加0.1mg/L、污泥回流比為4%時,沉淀池出水水質(zhì)最好,出水濁度基本都低于1NTU；在機(jī)械絮凝斜管沉淀池連續(xù)穩(wěn)定運行一段時間后,可以適當(dāng)降低混凝劑投加量至20-25mg/L,出水仍可達(dá)到預(yù)期效果。
[Abstract]:High density sedimentation water purification process is flocculation, sedimentation, sludge concentration in one of the new water treatment technology, has the advantages of small occupied area, with the advantages of high efficiency, has been widely used. At present, the domestic process of efficient sedimentation tank water has more than 50, the total amount of water is more than 15 million m3/d, the project has been built mostly draw lessons from the foreign high density sedimentation tank, and carry out design reference in mechanical mixing flocculation and sedimentation process of inclined pipe on the basis of the experience, countries do not have the corresponding design specification. The structure design of the sedimentation tank is more to meet the needs of process flow, less consideration. In the hydraulic conditions on flocculation and sedimentation
In this paper, the first water plant in Yangzhou city changed the mechanical flocculation inclined tube sedimentation tank in the expansion project as the object, using the research method of combining numerical simulation and, on particle concentration and flow sedimentation tank is simulated, the improvement measures are put forward to optimize the design of the pilot study, clear the main draw operation parameters. The following conclusions:
(1) based on the numerical concentration of granular sludge precipitation field simulation, the results show that the optimal particle density is 1050kg/m3, the high density of particles will exacerbate the current phenomenon, is a small influence on the precipitation efficiency.
(2) of different inlet height and the settling zone is added before the sink with simulating the effect. In the settling zone inlet width is constant, when the inlet height is 1.2m, the inlet velocity is 0.024m/s, the flow field distribution is more uniform; additional distributing water trough in the precipitation area, can make the uniform water distribution along the width direction, improve the flow stability, more conducive to the particle settling and sludge concentration.
(3) the research content is 2000m3/d in pilot plant by beaker experiment and pilot test of coagulant dosage, coagulant dosage, the sludge reflux optimized control parameters such as ratio of exploring the best operating parameters for the first raw water conditions. The results show that when the dosage of PAC 30mg/L PAM, the dosage of 0.1mg/L, sludge return ratio is 4%, the sedimentation tank effluent, the effluent turbidity was lower than that of 1NTU; the sedimentation tank is continuous and stable operation for a period of time in mechanical flocculation inclined tube, can reduce the dosage of the coagulant to 20-25mg/L, effluent can reach the expected effect.

【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU991.2

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