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采用双循环两相生物脱氮除磷工艺(BICT)进行除磷试验研究。双循环两相生物脱氮除磷工艺由独立设置的前置厌氧反应器、悬浮生长的主反应器、附着生长的硝化反应器及介于主反应器和硝化反应器之间的沉淀池组成。在改变四种运行参数(泥龄、充水比、上清液回流比、运行时序)的条件下,对双循环两相生物处理工艺的除磷能力进行了实验室规模的试验研究。试验用反应器总体积为70L,连续运行210d。试验原水为市政污水。结果表明:BICT工艺通过缩短主反应区的运行泥龄,在不降低系统脱氮效率的基础上,强化了系统的除磷能力。当泥龄从20d降低至5d时,系统的除磷效率由76.5%提高至89.3%。缩短泥龄使主反应区的充水比得以提高,容积利用率增加;充水比可由最初的33%增加至60%。硝化液回流比由100%提高到200%时,系统的除磷效率几乎没有变化,这说明硝化液回流比对系统除磷能力影响较小;在循环周期中增加后曝气可进一步提高系统的过剩摄磷能力。 相似文献
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改良A^2/O工艺脱氮除磷研究 总被引:1,自引:0,他引:1
实验研究了污泥回流比和混合液回流比对改良A2/O工艺脱氮除磷的影响.预缺氧池能够让NO3--N在进入厌氧池前被完全反硝化,保证磷的正常释放.污泥回流比对整个系统的处理效果影响较大,污泥回流比减小,生物反应器中的细菌数量会逐渐减少,出水水质变差;污泥回流比过大,系统处理效果也会变坏,实验采用50%、100%和150%污泥回流比,污泥回流比为50%时脱氮除磷效果最好.混合液回流比为200%、300%和400%对TN、TP的去除研究表明:混合液回流比增大为反硝化提供了更多的基质,从而提高总氮的去除效果,但是随着混合液回流比进一步增加,不会提高氮的去除效果,反而使能耗大大增加.因此,运行条件优选为污泥回流比为50%,混合液回流比为200%. 相似文献
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目前城镇污水处理厂大多存在运行能耗高、污水处理效能低、脱氮除磷能力不足等问题,污水处理提质增效迫在眉睫。以出水可稳定达到一级A标准的南京市某污水厂改进UCT工艺为工程实例,通过全流程水质监测与微生物群落结构分析,探究优化工艺设计与运行对强化脱氮除磷的影响。结果表明,通过合理设置分段进水、多点回流比例和回流点位,UCT工艺可取得较好的脱氮效果,TN去除率可达到79.23%和82.29%;延长HRT、降低厌氧区进水浓度、增加内回流点数均有利于多种脱氮途径协同作用,尤其厌氧氨氧化脱氮贡献可提高7.48%;但强化生物脱氮与除磷条件之间存在拮抗作用。微生物群落结构分析显示,HRT的增长及内回流点的增加有利于提高微生物多样性,同时能使浮霉菌门(Planctomycetes)占优,丰度为29.48%~50.67%,好氧池硝化螺旋菌属(Nitrospira)受到抑制。研究结果可为国内现有污水处理厂提质增效提供工艺改进和运行优化方面的指导和依据。 相似文献
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针对安宁市某污水处理厂低负荷污水的运行现状,通过序批式活性污泥法(SBR)中试模拟,对在不同污泥含量下系统脱氮除磷效果和不同回流方式(方式1为SBR池回流至生物选择区,方式2为SBR池回流至缺氧池后再回流至生物选择区)状态下的系统脱氮除磷效果进行分析。结果表明,污泥的质量浓度在4~5 g/L时,系统脱氮除磷效果为佳,TN、TP的去除率分别为46.52%、25.16%。回流方式1和方式的2的TP平均去除率分别为46.47%和56.99%,方式2除磷效果优于方式1;而脱氮效果无显著差异(TN的去除率分别为44.23%和49.10%)。 相似文献
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采用52.5 L的A2O试验装置处理实际生活污水,研究了A2O工艺在处理低C/N比生活污水时的脱氮除磷特性,并探讨了如何通过强化缺氧吸磷来提高系统的脱氮除磷效率。试验结果表明:在厌氧/缺氧/好氧体积比为1/1/2、HRT为8 h、污泥回流比为70%、内回流比为300%的工况下处理C/N为7.89的生活污水,TN和SOP去除率分别能够达到85.4%和93.3%,系统中存在反硝化除磷,缺氧吸磷占总吸磷量的25.3%。同样的运行条件下处理C/N为4.20的生活污水时,SOP去除几乎不受影响,但TN去除率降低至62.2%,平均出水TN浓度也超过20 mg8226;L-1。维持厌氧区体积不变,增大缺氧区体积,使得缺氧/好氧体积比为5/8时,TN去除率可上升到70.7%,缺氧吸磷占总吸磷量的55.2%。同时改变内回流比的试验表明250%的内回流比能最大程度地强化反硝化除磷的作用,此时TN去除率可提高至77.3%。强化A2O工艺中的反硝化除磷,能克服碳源不足对脱氮除磷的影响,显著提高低C/N比污水的脱氮除磷效率。 相似文献
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膜生物反应器强化脱氮除磷工艺优化与控制 总被引:2,自引:0,他引:2
随着城镇污水排放标准对氮、磷等营养元素的进一步提高,对于传统污水处理工艺来讲是一种挑战.膜生物反应器工艺技术以其独特的优势备受关注,在强化脱氮除磷方面亦表现出优于传统工艺的特点.非传统脱氮除磷的观念的后置反硝化工艺(无外加碳源)在膜生物反应器中得到了应用,并取得良好的去除营养物的效果.从现有的MBR脱氮除磷工艺着手,分析探讨了MBR脱氮除磷工艺研究进展及其应用前景. 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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针对传统多级A/O工艺处理低碳氮比生活污水除磷效果差的问题,本文通过增设前置厌氧段改良多级A/O工艺,重点研究了流量分配比对低碳氮比生活污水脱氮除磷的影响。系统在温度为(22±4)℃、水力停留时间为8h、污泥龄为14d、活性污泥浓度为2~3g/L、污泥回流比为75%时,系统依次在100%∶0∶0、45%∶30%∶25%、60%∶30%∶10%三种流量分配比下连续运行47d。结果表明,在45%∶30%∶25%的进水比下,COD、氨氮去除效果最佳,去除率分别达到90.24%和96.66%,出水浓度分别为30.97mg/L、2.11mg/L,均优于GB18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。三种流量分配比下系统对TN、TP总体去除效果一般,平均去除率为47.31%、49.33%,可通过外加碳源增强反硝化作用及化学除磷进一步降低氮磷出水浓度,出水有望达到一级B标准。改良工艺在保证有机物去除效果的基础上基本实现了脱氮除磷,可为实际生活中处理低C/N生活污水提供参考。 相似文献
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Fangang Meng Zhongbo Zhou Lei Li Ruiyun Li Xiaoshan Jia Shiyu Li 《American Institute of Chemical Engineers》2013,59(1):46-54
The feasibility of enhanced biological nutrient removal by a new process called nearly plug‐flow membrane bioreactor (NPFMBR) is studied. Results of long‐term observations showed that average removal degrees of (1) chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) reached 95%, 85%, and 89%, respectively, at the steady operation period. Process success was further corroborated by batch experiments. Data of specific oxygen uptake rates demonstrated the abundance and/or high activities of ammonium oxidation bacteria and nitrite oxidation bacteria in the sludge. Observed specific rates of nitrification, denitrification, phosphorous release/uptake of the sludge were higher than those reported in previous research. Because of the unique flow pattern of sludge and alternant aerobic–anoxic operating conditions in the bioreactor, mass transfer and biotransformation of nutrients were expected to be improved. The NPFMBR could offer a new option for the wider application of MBRs. © 2012 American Institute of Chemical Engineers AIChE J, 59: 46–54, 2013 相似文献