改良型Carrousel氧化沟工艺运行优化研究

发布时间：2018-06-11 22:28

本文选题：改良型Carrousel氧化沟 + 优化运行　；参考：《河北工程大学》2015年硕士论文

【摘要】：为解决某采用改良型Carrousel氧化沟工艺的污水处理厂运行中存在的问题,使其达到高效节能,本文以其为对象进行了工艺运行优化研究。通过系统水质分析,出水中CODCr、NH4+-N、TP和TN的平均浓度分别为46mg/L、11.24mg/L、0.64mg/L和17.95mg/L,相应的去除率分别为89%、73%、88%和65%,可见系统对NH4+-N、TN的去除效果劣于《城镇污水处理厂污染物排放标准》(GB18918-2002)中一级A排放标准。氧化沟水下推动器、曝气转碟单独运行及两者联合运行时沟内流态的测试分析表明,水下推动器单独工作即可保证沟内流速满足要求,曝气转碟主要为沟内混合液充氧;正常运行工况下,缺氧区断面平均流速在0.3m/s左右,底部流速大于0.1m/s;好氧区断面平均流速在0.41~0.56m/s之间,底部流速大于0.15m/s,可保证沟内的流态满足要求。针对该系统出水中NH4+-N、TN浓度偏高,对其SRT、HRT和DO浓度等运行参数进行了优化。研究结果表明,系统SRT过长、HRT短及DO浓度偏低是导致脱氮效果差的直接原因,将系统的SRT控制在18d、HRT控制在16h、DO浓度保持在2.0~2.5mg/L之间时该系统的脱氮效果最佳,出水中NH4+-N、TN的平均浓度分别稳定在3.17mg/L和12.55mg/L,其去除率分别为93%和78%。通过调整运行参数,并结合运行效果及能耗的分析比较,将系统的F/M控制在0.065~0.085kgBOD5/(kgMLSS·d)之间,SRT控制在18d,MLSS控制在4000mg/L左右,R控制在50%,HRT控制在18h,DO浓度保持在2.0~2.5mg/L之间时,其出水中CODCr、NH4+-N、TP、TN平均浓度分别为41.60mg/L、2.70mg/L、0.59mg/L、12.23mg/L,相应的去除率分别为83%、93%、87%、75%。工艺优化后,该工况下系统的运行能耗在0.22~0.27kw·h/m3之间。
[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.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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