共查询到19条相似文献,搜索用时 640 毫秒
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AAO-BAF工艺由厌氧-缺氧-好氧反应器和曝气生物滤池组成,属于外硝化反硝化除磷工艺。以实际生活污水为处理对象,通过调节进水COD浓度(从211 mg·L-1增加到675 mg·L-1),研究了进水COD和TN的比(C/N)对AAO-BAF工艺运行性能的影响。结果表明,进水有机物浓度低或高,可以通过限制厌氧释磷量或竞争AAO反应器缺氧区的NO3-,从而影响工艺的反硝化除磷效果。当进水C/N大于4,小于7时,AAO-BAF工艺对COD、TN和PO43-的去除率分别可达86%、78%和90%以上。很高的C/N(如9.5)会使缺氧区内存在大量挥发性脂肪酸(VFA),导致普通反硝化菌迅速消耗反硝化聚磷菌(DPAOs)的电子受体NO3-。 相似文献
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膜生物反应器处理废水硝化/反硝化能力研究 总被引:3,自引:3,他引:0
本研究采用前置缺氧/好氧膜生物反应(Anoxic/Oxic Membrane Bioreactor,AOmR)处理废水,分别对NH^ 4-N及总氮(TN)的去除效果、硝化/反硝化能力以及影响因素进行了研究。试验结果表明:在碳源充足、水力停留时间(HI汀)为6.5h、污泥泥龄(SRT)为30d、pH值范围为7、0~8.5条件下,进水NH^ 4-N平均值为240mg/L时,反应器能够保持良好的硝化、反硝化能力,出水NH^ 4-N值能稳定在2.5mg/L左右,平均去除率为98.5%,TN平均去除率为65%。 相似文献
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碳氮比对生物倍增工艺同步脱氮除磷的影响研究 总被引:1,自引:0,他引:1
试验研究了不同进水m(C)/m(N)对生物倍增工艺在同步脱氮除磷方面的影响。结果表明,当进水m(C)/m(N)在2.7~7.2之间时,系统对有机物、氨氮的去除效果不受m(C)/m(N)影响,去除率平均维持在90.78%和100%。进水m(C)/m(N)在2.7~7.2之间时,氮、磷的去除率以及SND率对系统的贡献随着m(C)/m(N)升高而增大。当进水m(C)/m(N)>7.2时,由于超出系统实际所能承受的负荷,不仅造成出水COD超标,而且多余的有机物在曝气区抑制了硝化效果,随之降低TN去除效果以及系统的SND率。碳源是决定系统脱氮除磷的首要因素。实际工程应用中,确定准确的碳源投加量很重要,应首先以对系统有机负荷的考量为基础。 相似文献
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溶解氧对膜生物反应器硝化反硝化的影响 总被引:2,自引:0,他引:2
实验采用一体式膜生物反应器处理生活污水,考察了溶解氧对膜生物反应器同步硝化反硝化作用的影响,同时对膜生物反应器中同步硝化反硝化机理进行了详细的分析。结果表明,反应器对NH3-N、TN的去除率受DO的影响较大,当HRT为6h,进水pH值为7.0~8.5,反应器温度为7-13℃,DO为1.5mg/L左右时,系统对NH3-N、TN的去除率分别在97%和92%以上,达到了同步硝化反硝化的运行条件。 相似文献
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潜流人工湿地对农村生活污水氮去除的研究 总被引:33,自引:0,他引:33
作者研究了潜流水平人工湿地处理农村生活污水中氮的去除效果,结果表明湿地进水TN负荷与出水TN负荷去除之间有较好的线性关系,随着水力停留时间的延长TN去除率也升高,停留时间为4d时,芦苇湿地和菖蒲湿地的脱氮效率可以达到60%以上。从脱氮效果看,芦苇湿地的略好于菖蒲湿地的,有植物系统明显好于无植物系统。在进水NO2^--N浓度小于0.062mg/L、NO3^--N浓度小于1.982mg/L的情况下,无论是连续运行还是间歇运行,大多数情况下,出水浓度都分别低于0.631mg/L和1.00mg/L,两者一般不会有较大的积累。试验分析了湿地脱氮的途径,微生物硝化/反硝化是人工湿地脱氮的主要途径,植物吸收、存储仅占湿地总氮去除量的10%左右,但是植物的存在间接地影响湿地脱氮的其它途径,对提高湿地氮去除率具有重要作用。 相似文献
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A~2/O工艺强化反硝化除磷控制策略研究 总被引:1,自引:0,他引:1
在传统A2/O工艺的基础上,通过设立预缺氧区(即建立A-A2/O工艺)、外加碳源等手段,强化A2/O工艺处理低C/N生活污水的脱氮除磷能力。试验结果表明,经过强化后的A2/O反应器对COD、TN及TP去除效果良好,COD、TN及TP的去除率分别为92%、98%、85%。系统表现出明显的反硝化除磷现象,缺氧区除磷量占总除磷量的17.18%。反硝化除磷现象的产生降低了碳源缺乏对A2/O工艺脱氮除磷性能的影响,提高碳源的利用效率。为采用A2/O工艺处理低C/N生活污水的污水处理厂提供理论依据。 相似文献
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城镇污水采用活性污泥法除磷脱氮工艺探讨 总被引:1,自引:0,他引:1
近年来,随着洗涤剂的广泛使用,废水中氮、磷的含量明显增加,引起水体富营养化加剧,因此,必须有效提高城镇污水处理厂氮和磷的去除。对多种除磷脱氮的活性污泥法,包括氧化沟工艺。A^2/O工艺、UCT工艺等,进行比较与分析,结果表明,UCT工艺比较适合除磷脱氮要求较高的污水处理厂应用。 相似文献
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江边污水处理厂采用改良型A2O处理工艺.实践表明,改良型A2O工艺对氨氮的去除率为90.73,对总磷的去除率为93.95%,取得了较好的处理效果.A2/O工艺系统作为新的污水生物处理工艺,在今后的城市污水与工业污水处理与回用中,将会有更广泛的应用. 相似文献
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In order to enhance phosphorus removal in traditional step-feed anoxic/oxic nitrogen removal process,a modified pilot-scale step-feed anaerobic/anoxic/oxic (SFA2/O) system was developed,which combined a reactor similar to UCT-type configuration and two-stage anoxic/oxic process.The simultaneous nitrogen and phosphorus removal capacities and the potential of denitrifying phosphorus removal,in particular,were investigated with four different feeding patterns using real municipal wastewater.The results showed that the feeding ratios(Q1)in the first stage determined the nutrient removal performance in the SFA2/O system.The average phosphorus removal efficiency increased from 19.17% to 96.25% as Q1 was gradually increased from run 1 to run 4,but the nitrogen removal efficiency exhibited a different tendency,which attained a maximum 73.61% in run 3 and then decreased to 59.62% in run 4.As a compromise between nitrogen and phosphorus removal,run 3 (Q1=0.45Qtotal) was identified as the optimal and stable case with the maximum anoxic phosphorus uptake rate of 1.58mg·(g MLSS)-1·h-1.The results of batch tests showed that ratio of the anoxic phosphate uptake capacity to the aerobic phosphate uptake capacity increased from 11.96% to 36.85% with the optimal influent feeding ratio to the system in run 3,which demonstrated that the denitrifying polyP accumulating organisms could be accumulated and contributed more to the total phosphorus removal by optimizing the inflow ratio distribution.However,the nitrate recirculation to anoxic zone and influent feeding ratios should be carefully controlled for carbon source saving. 相似文献
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采用混合反应器模拟氧化沟运行方式,探讨氧化沟不同好氧缺氧分区对脱氮除磷效果的影响。结果表明,在分点曝气氧化沟系统中氧传质推动力大,溶氧效率高,在相同的供氧条件下,其一个循环的好氧区比分段曝气系统好氧区长,但是分点曝气系统有机物耗氧多,DO浪费大,而分段曝气溶氧效率低,但DO的有效利用率(用于脱氮除磷)高,二者硝化能力相当,NH4+-N去除率分别为96.68%和97.03%,硝化菌活性分别为4.65、4.66 mg.g-1.h-1。在好氧区和缺氧区比例相同的条件下,分区越多,有机物被好氧异养菌利用的越多,脱氮除磷效果越差。分区减少,可以有效地增加反硝化菌对碳源的利用,对提高脱氮效果更有利。在同样的供氧条件下,分段曝气单个A/O分区长,反硝化菌和聚磷菌对碳源利用多,脱氮除磷效果优于分点曝气,在满足硝化的前提下,缺氧区和好氧区比例越大,碳源被利用的越完全,对脱氮除磷越有利,DO的有效利用率也越高,此时越接近于前置缺氧-好氧(A/O)工艺。 相似文献
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生物脱氮除磷系统中磷的去除通过排放剩余污泥实现,需要短泥龄微生物;而硝化细菌为自养菌,需要较长的生长时间。在低温(≤10℃)条件下,硝化污泥泥龄一般为15~20 d,而聚磷菌泥龄为4~5 d,这种巨大的泥龄差距导致现有A2/O在低温下很难实现同时脱氮除磷。本文利用改良的倒置A2/O工艺,研究了低温条件下的生物脱氮除磷效果。结果显示:该工艺低温条件下COD的去除率在85%以上,氨氮去除率低温条件下可达到85%,磷的去除率低温条件下为80%,出水能够达到国家二级排放标准。 相似文献
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Chang‐Yong Wu Yong‐Zhen Peng Chun‐Li Wan Shu‐Ying Wang 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2011,86(3):461-467
BACKGROUND: In this study, a plug‐flow A2O (anaerobic/anoxic/oxic) reactor, with a working volume of 52.5 L, was employed to investigate the performance of biological nutrients removal and microbial population variations when treating low C/N ratio domestic wastewater. RESULTS: Results showed that TN removal was significantly affected by the shortage of carbon source while phosphorus removal was only slightly affected. The effluent soluble orthophosphate‐phosphorus (SOP) concentration was lower than 0.50 mg L?1 but the TN concentration was over 20 mg L?1 when the C/N ratio was 4.43. There was denitrifying phosphorus removal in the anoxic reactor and this was enhanced by increasing the volume ratio of anoxic reactor and maintaining appropriate mixed liquor recycle rate. More than 60% of the SOP were removed in anoxic reactors by denitrifying phosphorus removal when the volume ratio of anaerobic/anoxic/oxic was 1/1.4/1.6 and the mixed liquor recycle rate was 250%. The TN concentration of effluent decreased to 11.34 mg L?1 and SOP concentration was still lower than 0.5 mg L?1 in this condition. The main microorganisms found in the process by polymerase chain reaction‐denaturing gradient gel electrophoresis (PCR‐DGGE) and the functional biodiversity are discussed. CONCLUSION: Traditional design and operating parameters of A2O are not appropriate for treating low C/N wastewater. Enhancing the denitrifying phosphorus removal ratio in an A2O process is an effective way to increase the removal rate of N and P from low C/N wastewater. Copyright © 2010 Society of Chemical Industry 相似文献