A+A~2/O工艺脱氮除磷参数调控及运行效果分析

结合广州市猎德污水处理厂A+A2/O工艺的实际运行情况,对其脱氮除磷参数调控和运行效果进行了分析。首先考察了冬天低温条件下的脱氮除磷效果,然后经过不同混合液体积回流比和污泥体积回流比的运行分析,得到适合工艺运行的最佳值,分别为100%和100%,还对其它参数调控进行了简要介绍,最后对工艺整体运行效果进行了分析,得到良好的结果。证明A+A2/O工艺具有良好的脱氮除磷效果。     

倒置A2/O与改良A2/O工艺生产性试验比较

以典型高浓度城市污水为处理对象,在生产性试验规模上,比较了不同回流比条件下倒置A2/O工艺与改良A2/O工艺在脱氮除磷效果上的不同,并研究了通过缩短初沉池水力停留时间缓解脱氮除磷碳源矛盾的可行性.试验结果表明,以较低污泥回流比运行的倒置A2/O工艺可以保持较好脱氮除磷效果,与相同污泥回流比而硝化液回流比为300%平行运行的改良A2/O工艺脱氮效果基本相当,但除磷效果优于改良A2/O工艺;提高倒置A2/O工艺污泥回流比至200%左右时,其脱氮除磷效果均优于改良A2/O工艺;通过缩短初沉池水力停留时间可以有效缓解生物脱氮除磷碳源的矛盾,提高系统整体脱氮除磷效果.     

新型三维电极生物膜工艺强化脱氮除磷特性

针对常规三维电极生物膜工艺脱氮除磷时难以达到高效、同步的脱氮除磷效果,将海绵铁、硫磺与活性炭填料复合用于常规工艺中以提高脱氮除磷效率。实验结果表明,在不同电流强度下,新型反应器对TN和TP的去除率最高可达到80%和92%,分别比常规反应器要高出15%和32%左右。综合经济、运行效果等因素,新型三维电极生物膜反应器在300 m A电流条件下,选择6 h的水力停留时间为适宜运行条件。     

ICEAS工艺脱磷除氮的影响因素

介绍了ICEAS工艺的特点,可以从时间上实现脱氮、除磷的厌氧一好氧间歇状态。通过对瓦房店龙山污水处理厂一年半的运行分析,提出脱氮除磷的影响因素,总结了运行的最佳参数。     

改良型Carrousel 2000氧化沟生物脱氮除磷效果分析

为考察某改良型Carrousel 2000氧化沟工艺生物脱氮除磷效果,提出保障出水达标优化建议,通过实际运行资料及污染物沿程变化取样监测,分析脱氮除磷主要影响因素。结果表明:该氧化沟工艺出水TN、TP浓度有超标风险。氧化沟中沿程DO的质量浓度为2~5 mg/L,存在过度曝气现象,且实际进水碳氮比为2~5,影响了缺氧区的脱氮效果,造成二沉池出水和回流污泥NO3--N浓度较高,导致厌氧区释磷效果差,影响生物除磷效果。建议采用间歇曝气技术对该污水处理厂进行优化运行,在提高污水处理厂脱氮除磷效果的同时降低能耗,减少运行成本。     

高效脱氮除磷系统除磷效果优化分析

针对南方城市污水C\N较低的特点以及现有脱氮除磷工艺脱氮除磷效率不高的缺点,设计了一套高效脱氮除磷工艺来强化脱氮除磷的中试装置。本工艺以广州市石井污水处理厂细格栅出水作为处理对象,针对不同工艺参数的除磷效果进行研究,并对各种因素进行组合实验。实验研究结果表明,当好氧池末端的溶解氧质量浓度为1.5mg/L,水力停留时间(HRT)为8h,硝化液回流比为200%,缺氧混合液回流比为150%,体积比为1:2.6:6.4时,高效脱氮除磷工艺对有机物和总磷的处理效果最佳,出水平均COD为32.04 mg/L,TP的平均质量浓度为0.35mg/L,去除率分别为81.32%和85.60%,达到城镇污水处理厂污染物排放标准1级A标准,取得了较好的除磷效果,并且系统抗冲击负荷能力强,装置运行稳定。     

BDC工艺对废水脱氮除磷的研究与应用

研究BDC工艺除氮脱磷,讨论pH值、曝气、悬浮物等因素的影响,并对BDC工艺中脱氮除磷的相互影响进行了探讨,给出了同时脱氮除磷的BDC运行方法,使磷铵厂氮磷废水达到中水回用的目的。     

铜仁市污水处理厂除磷工艺运行研究

随着社会的发展和现代化工业的迅速发展及人们生活水平的不断提高,生活污水和工业废水的大量排放,氮、磷的污染也日趋严重,水体的富营养化问题引起了整个社会的关注及专家的重视。人们环保意识逐渐加强,生物除磷脱氮技术得到了较大的发展和应用,通过国家及地方投资建立了多种形式的除磷脱氮城市污水处理厂。本文结合铜仁市污水处理厂A2/O工艺系统的运行情况,对生物除磷脱氮机理、影响除磷效果的因素进行研究,为全面提高A2/O工艺系统的运行效果提供一定经验。     

膜生物反应器脱氮除磷技术的研究进展

膜生物反应器(MBR)脱氮除磷技术是一种新型的脱氮除磷技术,在单一好氧膜生物反应器基础上,向与A/O、A2/O和SBR等工艺形式相结合的方向发展。介绍了近年来膜生物反应器在脱氮除磷方面的基本特点、研究现状、存在问题,分析了运行方式、技术参数对处理效果的影响,并指出了膜生物反应器脱氮除磷技术的发展方向。     

双污泥反硝化脱氮除磷工艺的影响因素及分析

介绍了双污泥反硝化脱氮除磷工艺的反应机理,从C/N、超越污泥回流比、pH、DO、HRT及MLSS等方面分析了对双污泥反硝化脱氮除磷工艺在运行过程中的影响及目前国内外双污泥反硝化脱氮除磷工艺的研究现状,提出了今后在双污泥反硝化脱氮除磷工艺的研究中应当解决的问题.     

并联式A~2O/MBR反硝化聚磷工艺试验研究

基于反硝化聚磷理论,结合MBR工艺的优点,在传统A2O工艺的基础上提出新型并联式同步脱氮除磷工艺。工艺解决了传统工艺中的碳源不足、硝酸盐氮供需矛盾等问题;通过省去沉淀池,节约了占地面积。针对常规城市污水,研究了不同工艺条件对处理效果的影响。结果表明,当污泥体积回流比为50%,内体积回流比为100%时具有较好的去除效果,COD、NH4+-N、TP和TN去除率分别达到了90%、99%、94.4%和67%。     

流量分配比对改良多级A/O污染物的去除影响

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。     

回流比对分段进水A2/O工艺脱氮除磷影响的小试研究

针对上海某污水厂实际运行中的问题,通过小试试验考察不同混合液回流比、污泥回流比及进水流量分配对分段进水A2/O工艺影响,以期提高其脱氮除磷效果。结果表明,混合液回流比对COD、TP和NH3-N的去除效果影响较小,对TN的影响较大,系统的混合液回流比维持在200％较为合适;污泥回流比对系统整体功能的发挥影响很大,污泥回流...     

Effects of influent C/N ratio,C/P ratio and volumetric exchange ratio on biological phosphorus removal in UniFed SBR process

BACKGROUND: UniFed SBR is a novel process that can achieve high levels of nitrogen and phosphorus removal simultaneously in a simple single SBR tank. In this study, effects of influent C/N ratio, influent C/P ratio and volumetric exchange ratio on biological phosphorus removal in UniFed SBR process were investigated in a lab‐scale UniFed apparatus treating real domestic wastewater. RESULTS: The results showed that phosphorus removal efficiency increased as C/N ratio increased from 27% at 2.8 to 88% at 5.7. For C/N ratios 6.5 and above, complete phosphorus removal could be achieved. When C/N ratios and volumetric exchange ratio were fixed at 6 and 33%, respectively, phosphorus removal efficiency remained at 100% for C/P ratios higher than 33; effluent phosphate concentration was below the detection limit. For C/P ratios lower than 33, phosphorus removal efficiency decreased linearly with C/P ratio. Under the same influent C/N ratio and C/P ratio, the following factors all contributed to better phosphorus removal performance: greater volumetric exchange ratio; more organic substrate for PAOs to utilize, less inhibition by NO_x^? of phosphorus release during the feed/decant period; more PHB synthesized; and more aerobic phosphate uptake. CONCLUSION: High influent C/N ratio, high C/P ratio and high volumetric exchange ratio were beneficial to phosphorus removal in this process. Copyright © 2008 Society of Chemical Industry     

氧化沟不同分区脱氮除磷研究

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。     

改良微孔Carrousel氧化沟工艺脱氮除磷

结合污水厂脱氮除磷运行的经验,提出了改良微孔Carrousel氧化沟工艺,探讨其脱氮除磷的功效。实验结果表明：在合适的工艺参数控制下,10％的进水进入缺氧区,90％的进水进入生物选择区,20％的污泥回流到缺氧区,其余的污泥回流到氧化沟的缺氧区,可获得良好的脱氮除磷效果（出水中总磷的质量浓度〈0．5mg／L,NH3-N的质量浓度〈15mg／L）。     

Characteristics of simultaneous nitrogen and phosphorus removal in a pilot-scale sequencing anoxic/anaerobic membrane bioreactor at various conditions

This study was conducted to evaluate the performance of pilot-scale sequencing anoxic/anaerobic membrane bioreactor (SAM) process under various real situations. During the pilot experiment, the effect of three important operational parameters, such as hydraulic retention time (HRT), solids retention time (SRT) and internal recycling time mode were estimated and the long-term membrane fouling behaviour was also investigated. During the operation period, the COD removal efficiency was higher than 95% regardless of change of operational conditions because the membrane significantly contributed to remove COD by the complete retention of all particulate COD and macromolecular COD components. The change of Ax/An ratio representing internal recycling time mode significantly affected on nitrogen and phosphorus removal. As increasing Ax/An ratio, nitrogen removal efficiency increased but phosphorus removal efficiency decreased. As HRT decreased, phosphorus removal efficiency increased and nitrogen removal efficiency also increased until a certain limit of HRT (6.5 h in this study). However, when HRT decreased over the limit, nitrogen removal efficiency decreased because of insufficient nitrification. Relation between phosphorus removal efficiency and SRT was a little bit complex because SRT determined both the phosphorus content in the sludge and the sludge wasting rate. However, in this study, the shorter SRT resulted in the higher phosphorus removal efficiency. The effect of changes in all operational conditions was sensitive on phosphorus rather than on nitrogen removal efficiency. The increasing in influent flowrate resulted in the increase of flux and caused a rapid membrane fouling. Thus, the flux of 7.7 L/m²/h was more desirable compared to the 10.7 or 15.4 L/m²/h in this study.     

生物造粒流化床脱氮除磷研究

进行了生物造粒流化床对城市污水脱氮除磷效果的试验。试验结果表明,生物造粒流化床对TN、NH3-N、TP的去除率分别达53．5％、41．6％和95．1％。氮的去除可以用微环境理论来解释,而除磷主要通过化学作用。     

改进型分段进水厌氧/缺氧/好氧工艺强化营养物去除

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=0.45Q_total) 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.