本文選題：改良型Carrousel氧化溝 + 優(yōu)化運(yùn)行��； 參考：《河北工程大學(xué)》2015年碩士論文

【摘要】：為解決某采用改良型Carrousel氧化溝工藝的污水處理廠運(yùn)行中存在的問題,使其達(dá)到高效節(jié)能,本文以其為對象進(jìn)行了工藝運(yùn)行優(yōu)化研究。通過系統(tǒng)水質(zhì)分析,出水中CODCr、NH4+-N、TP和TN的平均濃度分別為46mg/L、11.24mg/L、0.64mg/L和17.95mg/L,相應(yīng)的去除率分別為89%、73%、88%和65%,可見系統(tǒng)對NH4+-N、TN的去除效果劣于《城鎮(zhèn)污水處理廠污染物排放標(biāo)準(zhǔn)》(GB18918-2002)中一級A排放標(biāo)準(zhǔn)。氧化溝水下推動(dòng)器、曝氣轉(zhuǎn)碟單獨(dú)運(yùn)行及兩者聯(lián)合運(yùn)行時(shí)溝內(nèi)流態(tài)的測試分析表明,水下推動(dòng)器單獨(dú)工作即可保證溝內(nèi)流速滿足要求,曝氣轉(zhuǎn)碟主要為溝內(nèi)混合液充氧;正常運(yùn)行工況下,缺氧區(qū)斷面平均流速在0.3m/s左右,底部流速大于0.1m/s;好氧區(qū)斷面平均流速在0.41~0.56m/s之間,底部流速大于0.15m/s,可保證溝內(nèi)的流態(tài)滿足要求。針對該系統(tǒng)出水中NH4+-N、TN濃度偏高,對其SRT、HRT和DO濃度等運(yùn)行參數(shù)進(jìn)行了優(yōu)化。研究結(jié)果表明,系統(tǒng)SRT過長、HRT短及DO濃度偏低是導(dǎo)致脫氮效果差的直接原因,將系統(tǒng)的SRT控制在18d、HRT控制在16h、DO濃度保持在2.0~2.5mg/L之間時(shí)該系統(tǒng)的脫氮效果最佳,出水中NH4+-N、TN的平均濃度分別穩(wěn)定在3.17mg/L和12.55mg/L,其去除率分別為93%和78%。通過調(diào)整運(yùn)行參數(shù),并結(jié)合運(yùn)行效果及能耗的分析比較,將系統(tǒng)的F/M控制在0.065~0.085kgBOD5/(kgMLSS·d)之間,SRT控制在18d,MLSS控制在4000mg/L左右,R控制在50%,HRT控制在18h,DO濃度保持在2.0~2.5mg/L之間時(shí),其出水中CODCr、NH4+-N、TP、TN平均濃度分別為41.60mg/L、2.70mg/L、0.59mg/L、12.23mg/L,相應(yīng)的去除率分別為83%、93%、87%、75%。工藝優(yōu)化后,該工況下系統(tǒng)的運(yùn)行能耗在0.22~0.27kw·h/m3之間。
[Abstract]:In order to solve the problems existing in the operation of a sewage treatment plant using the improved Carrousel oxidation ditch process and to achieve high efficiency and energy saving, this paper studies the optimization of the process operation on the basis of the improved Carrousel oxidation ditch process. Through systematic water quality analysis, The average concentrations of NH _ 4-NN ~ (2 +) and TN in effluent were 46mg / L ~ 11.24 mg / L ~ (0.64) mg / L and 17.95 mg / L, respectively, and the corresponding removal rates were 89773 ~ 88% and 65 ~ 65mg / L, respectively. It can be seen that the removal effect of NH _ 4-NN _ (TN) by the system is inferior to that of the first class A emission standard (GB 18918-2002). The test and analysis of the flow state in the ditch of oxidation ditch underwater propulsion, aeration disc running alone and combined operation show that the flow rate in the ditch can be satisfied by working alone, and the aeration disc is mainly oxygenated with mixed liquid in the ditch. Under normal operating conditions, the average velocity of cross section in anoxic zone is about 0.3m/s, the flow velocity at bottom is greater than 0.1 m / s, the average velocity of section in aerobic zone is between 0.41~0.56m/s and the flow velocity at bottom is greater than 0.15 m / s, which can ensure that the flow state in the ditch can meet the requirements. In view of the high concentration of NH _ 4-NN _ N in the effluent of the system, the operation parameters such as HRT and do concentration were optimized. The results show that the short HRT of SRT and low do concentration are the direct reasons for the poor denitrification effect. When the SRT of the system is controlled at 18 days or so, the denitrification effect of the system is the best when the SRT of the system is kept in the range of 2.0 ~ 2.5mg / L of do concentration. The average concentration of NH _ 4-N _ 4 TN in effluent was stable at 3.17 mg / L and 12.55 mg / L, respectively, and the removal rates were 93% and 78%, respectively. By adjusting the operation parameters and comparing the operation effect and energy consumption, the F- / M of the system is controlled between 0.065 and 0.085 kg BOD5 / kg MLSs. The SRT is controlled at 18 days or so, the MLSS is controlled at about 4,000 mg / L and R is controlled at 50% and HRT is kept in the range of 2.0 mg / L at 18 h, when the concentration of do is kept between 2.0 mg / L and 2.5 mg / L, The average concentration of COD Cr 4 NH 4 NN TPN TN is 41.60 mg / L 2.70 mg / L 0.59 mg / L = 12.23 mg / L respectively, and the corresponding removal rate is 833 mg / L and 933 mg / L, respectively. After process optimization, the operating energy consumption of the system is between 0.22~0.27kw h/m3.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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