双泥法多点进水OAO工艺处理生活污水的试验研究

发布时间：2018-06-10 12:32

本文选题：OAO工艺 + 生活污水　；参考：《郑州大学》2017年硕士论文

【摘要】：随着社会经济的快速发展,对水环境的要求越来越高,污水排放标准也越来越严格。因此,高效脱碳脱氮除磷系统的研究,对脱氮除磷工艺的发展具有重要的意义,有着广阔的应用前景。本试验采用双泥法多点进水OAO工艺,研究了污泥驯化培养期间的污染物去除情况,以及不同的进水流量配比和好氧池溶解氧对系统的运行性能的影响,得出了系统的最佳进水流量配比和溶解氧浓度,并在最佳工况下,对系统的微生物群落变化进行了研究,主要结论如下所示:(1)驯化培养期间,随着污泥培养的进行,各污染物的去除率均呈现上升趋势,在接种污泥驯化培养的后期(第12天之后),系统对COD、氨氮、TN和TP的去除率分别能达到95%以上、93%以上、52%以上和55%以上,去除效果良好。(2)在进水流量分配比分别为1:1、1.5:1、2:1三种情况下,系统对COD和氨氮均具有良好的去除效果和稳定的去除率,出水均能满足《城镇污水处理厂污染物排放标准》(GB18918-2002)的一级A标准,改变进水流量配比对COD和氨氮的去除没有明显的影响。不同进水流量配比对TN的去除效果影响较大,随着进水流量配比的增大,TN的平均去除率先上升至55%左右,后有小幅度下降,当Q1/Q2=1.5:1时,TN平均去除率为55.94%,此时TN的去除率最高。不同进水流量配比对TP的去除效果也有着明显的影响,且TP去除率的波动相对较大,随着进水流量配比的增大,TP的平均去除率整体呈先上升后下降的趋势,当Q1/Q2=1.5:1时,TP去除率最高。整体而言,当Q1/Q2=1.5:1时,COD、氨氮、TN、TP均能达到较高的去除率。(3)低溶解氧条件下,系统的COD和氨氮去除率很高,都能达到90%以上,而且对去除效果的影响都很小,出水均能够满足《城镇污水处理厂污染物排放标准》(GB18918-2002)的一级A标准。随着溶解氧的增加,TN的去除率有所降低,且当溶解氧为1.0mg/L时,TN的去除效果相对较好。此时,TN的平均去除率为54.08%。系统对TP的去除率起伏较大,当溶解氧为1.0mg/L时,TP的平均去除率为47.94%,当溶解氧为1.3mg/L时,TP的平均去除率为41.80%,整体上,当溶解氧为1.0mg/L时,系统对TP的去除率较高。整体而言,溶解氧为1.0mg/L时,COD、氨氮、TN、TP均能达到较高的去除率。说明实际运行中可以适当的降低曝气量,以及双泥法多点进水OAO工艺能够实现低能耗下的高效脱氮除磷效果。(4)研究中采用16sDNA高通量测序技术,对接种污泥以及最佳运行状况下的曝气池、缺氧池和好氧池内微生物群落进行对比,结果表明:变形菌门(Proteobacteria)和拟杆菌门(Bacteroidetes)为优势菌群,尤其是变形菌门的的β-变形菌纲(Betaproteobacteria)、γ-变形菌纲(Gammaproteobacteria)占主要优势。
[Abstract]:With the rapid development of social economy, the requirement of water environment is more and more high, and the sewage discharge standard is becoming more and more strict. Therefore, the study of high efficiency decarbonization, nitrogen and phosphorus removal system is of great significance to the development of nitrogen and phosphorus removal process and has a broad application prospect. The removal of pollutants during sludge acclimation and the effects of different influent flow ratios and dissolved oxygen in aerobic ponds on the operation performance of the system were studied by using the dual sludge multi-point influent OAO process. The optimum influent flow ratio and dissolved oxygen concentration of the system were obtained. Under the optimum conditions, the microbial community changes of the system were studied. The main conclusions were as follows: 1) during the domestication period, the sludge culture was carried out. The removal rate of each pollutant showed an upward trend. In the late stage of acclimation and cultivation of inoculated sludge (after 12 days), the removal rates of COD, NH3-TN and TP reached more than 95%, more than 93% and 55%, respectively. When the influent flow distribution ratio is 1: 1: 1.5: 1: 1: 1, respectively, the system has good removal efficiency and stable removal rate for both COD and ammonia nitrogen. The effluent can meet the first class A standard of "pollutant discharge standard of municipal wastewater treatment plant" (GB18918-2002), and the change of influent flow ratio has no obvious influence on COD and ammonia nitrogen removal. With the increase of influent flow ratio, the average removal rate of TN increased to about 55%, and then decreased by a small margin. The average removal rate of TN was 55.94 when Q1 / Q2 was 1.5: 1, and the removal rate of TN was the highest. The removal efficiency of TP was significantly affected by different influent flow ratio, and the fluctuation of TP removal rate was relatively large. With the increase of influent flow ratio, the average removal rate of TP increased first and then decreased, as a whole, the average removal rate of TP increased first and then decreased with the increase of influent flow ratio. When Q _ 1 / Q _ 2 is 1.5: 1, the removal rate of TP is the highest. On the whole, when Q1 / Q2 + 1.5: 1, COD and TNTP can reach a higher removal rate, the removal rate of COD and NH3-N can reach more than 90%, and the effect on the removal efficiency is very small, and the removal rate of COD and NH3-N can reach more than 90% under the condition of low dissolved oxygen. The effluent can meet the first class A standard of the pollutants discharge Standard of the Municipal sewage treatment Plant (GB18918-2002). The removal rate of TN decreased with the increase of dissolved oxygen, and the removal efficiency of TN was better when the dissolved oxygen was 1.0 mg / L. The average removal rate of TN was 54.08%. The average removal rate of TP is 47.94 when dissolved oxygen is 1.0 mg / L, and 41.80 when dissolved oxygen is 1.3 mg / L. overall, when dissolved oxygen is 1.0 mg / L, the removal rate of TP is higher. On the whole, when the dissolved oxygen is 1.0 mg / L, the removal rate of COD and TNT can reach a higher rate. The results show that the aeration rate can be reduced properly in the actual operation, and the high throughput sequencing technology of 16s DNA can be used in the study of high efficiency denitrification and phosphorus removal under low energy consumption by dual-mud multi-point influent OAO process. The microbial communities in aeration tank, anoxic tank and aerobic pond were compared under the best conditions of inoculation sludge. The results showed that Proteobacteria) and Bacteroideteswere the dominant bacteria. In particular, Beta proteobacteriae and Gamma proteobacteriae of the phylum of Proteus are dominant.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X799.3

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