共查询到20条相似文献,搜索用时 250 毫秒
1.
SBR工艺脱氮除磷研究进展 总被引:9,自引:2,他引:9
概述了SBR脱氮工艺中的同步硝化/反硝化,亚硝化脱氮现象,讨论了影响SBR除磷的碳源,聚磷菌与非聚磷菌竞争,pH值,好氧曝气,污泥龄,水力停留时间等因素,并对SBR工艺中脱氮与去除之间的相互影响进行了探讨,最后给出了可以同时脱氮除磷的一种SBR运行方式。 相似文献
2.
本文通过测定两种工艺出水的水质参数TN、TP,对A—O和A—A-O两个工艺进行了对比分析,探讨了聚磷菌,硝化菌,反硝化菌的微生物学特征,分析了池中污水脱氮除磷的机理及其影响因素。 相似文献
3.
4.
随着反硝化聚磷菌的发现出现了新型的反硝化聚磷的生物除磷脱氮工艺。探讨了反硝化除磷的机理及工艺运行效果。分析了新型的反硝化除磷脱氮工艺与传统的工艺相比的优势及该新型工艺的创新之处,并对工艺的应用及发展趋势进行了探讨。 相似文献
5.
(AO)2-SBBR反硝化除磷工艺处理低碳城市污水 总被引:1,自引:0,他引:1
低碳源浓度城市污水的脱氮除磷一直是个难题,为此在AO-SBBR工艺中引入一个缺氧段而形成(AO)2-SBBR工艺,研究了AO-SBBR和(AO)2-SBBR对低碳源浓度城市污水中氮、磷的去除效果。试验结果表明:在进水BOD5/TN=3、BOD5/TP=17的情况下,(AO)2-SB.BR工艺比AO-SBBR工艺具有更好的同步脱氮除磷效果,对总磷的去除率达到了79.8%,对总氮的去除率从25.83%提高到51.26%,出水水质达到了《城镇污水处理厂污染物排放标准》的一级标准。该工艺有效解决了低碳源浓度城市污水在同步脱氮除磷过程中有机物不足的问题,并在单一反应器中实现了反硝化除磷菌的增殖过程,反硝化除磷菌占聚磷菌的比例从14.82%增长到63.04%;反硝化除磷菌能够以低浓度的亚硝酸盐氮作为电子受体进行缺氧吸磷,如亚硝酸盐氮〉10mg/L则会抑制反硝化除磷菌的活性,而且这种抑制作用并不是瞬时的,至少要持续一段时间其活性才能恢复。 相似文献
6.
在城市污水处理众多的脱氮除磷工艺中,A2O工艺由于具有工艺简单,不易产生污泥膨胀,总水力停留时间较短且运行费用低等优点,被城市污水处理厂广泛使用。但该工艺由于硝化菌、反硝化菌和聚磷菌在污泥停留时间、溶解氧以及碳源等方面存在冲突,因此难以同时获得好的脱氮除磷效果。因此通过对上述制约因素的分析研究,在传统A2O工艺的基础上,开发出了Biowin工艺、UCT工艺、Phostrip工艺以及PAST工艺,这些工艺改进都是围绕SRT、DO以及碳源等因素进行的,都是为了给硝化菌、反硝化菌和聚磷菌创造最佳的生存环境。由于没有一种工艺是绝对可行的,因此应根据实际情况确定合适的工艺。随着短程硝化-反硝化理论、反硝化除磷等理论研究的不断深入,还会有更多的新工艺出现。 相似文献
7.
8.
从微生物学探讨生物除磷脱氮机理 总被引:12,自引:3,他引:12
从微生物学探讨生物除磷脱氮机理陈欣燕程晓如陈忠正(武汉工业大学)从微生物学方面探讨生物除磷脱氮法的机理,将有助于采取合理措施提高生物除磷脱氮的效率。生物除磷脱氮系统只有一个污泥系统,同时存在着分解有机物的异养菌群、反硝化菌群及硝化菌群,混合的微生物菌... 相似文献
9.
A~2/O工艺的反硝化除磷特性研究 总被引:6,自引:2,他引:4
为了解传统A2/O工艺中反硝化除磷的作用及强化缺氧吸磷对系统同步脱氮除磷的贡献,以实际生活污水为处理对象,系统研究了缺氧段的反硝化除磷特性及其强化措施,并通过序批式试验考察了除磷微生物种群比例的变化.试验结果表明:稳定运行的A2/O系统中存在反硝化除磷现象,通过提高缺氧段的NO-3-N负荷,可使缺氧除磷贡献率从33.3%提高到53.3%,且系统的除磷率维持在95.4%以上;同时,好氧段的曝气量从400 L/h减少到260 L/h,节约了近35%;反硝化聚磷菌占聚磷菌的比例由35.4%提高到51.3%左右,微生物种群得到了优化.强化A2/O工艺的反硝化除磷功能,对提高低C/N值污水的脱氮除磷效率及降低运行能耗具有重要的意义. 相似文献
10.
11.
A novel post denitrification configuration for phosphorus recovery using polyphosphate accumulating organisms 总被引:1,自引:0,他引:1
Enhanced biological phosphorus removal (EBPR) has been widely used to remove phosphorus (P) from wastewater. In this study we report a novel modification to the EBPR approach, namely enhanced biological phosphorus removal and recovery (EBPR-r) that facilitates biological recovery of P from wastewater using a post denitrification configuration. The novel approach consists of two major steps. In the first step, a biofilm of phosphorus accumulating organisms (PAOs) is exposed to a wastewater stream in the absence of active aeration, during which P is taken up by the biofilm using nitrate and residual dissolved oxygen as electron acceptors. Thus, P and nitrogen (N) removal from wastewater is achieved. During the second step, the P enriched biofilm is exposed to a smaller recovery stream supplemented with an external carbon source to facilitate P release under anaerobic conditions. This allows P to be recovered as a concentrated liquid. The EBPR-r process was able to generate a P recovery stream four time more concentrated (28 mg-P/L) than the wastewater stream (7 mg-P/L), while removing nitrate (denitrification) from the wastewater stream. Repeated exposure of the biofilm (10 P-uptake and release cycles) to a recovery stream yielded up to 100 mg-P/L. Overall, EBPR-r is the first post denitrification strategy that can also facilitate P recovery during secondary wastewater treatment. 相似文献
12.
短好氧泥龄下A2/O和BAF联合工艺的脱氮除磷特性 总被引:2,自引:0,他引:2
采用小试装置,研究了短好氧污泥龄下A2/O和BAF联合工艺处理低C/N和C/P污水时的脱氮除磷特性.结果表明,通过提高A2/O工艺段的厌氧区有机负荷和缺氧区硝酸盐负荷对反硝化聚磷菌(DPAOs)进行选择和强化后,其在聚磷菌(PAOs)中的比例维持在28%左右,工艺具有部分反硝化除磷能力,能够减少脱氮除磷过程中对碳源的总需求量.但在联合工艺中,好氧除磷仍是主要的除磷方式.在A2/O工艺段内,好氧污泥龄在满足好氧PAOs存活的同时,还必须满足抑制硝化细菌生长的要求,且为了保证工艺对磷的整体去除效果,混合液在好氧区的接触时间须大于30 min.此外,以保证缺氧区出水中含有1~4 mg/L的硝态氮为原则来控制BAF出水的回流量,可达到较好的脱氮除磷效果.该联合工艺结合了活性污泥工艺和生物膜工艺的优点,运行稳定,出水水质优良,不仅适合于新建污水处理厂,也特别适合于不能脱氮除磷污水处理厂的技术改造. 相似文献
13.
The objective of this research was to advance a fundamental understanding of a unique post-anoxic denitrification process for achieving biological nutrient removal (BNR), with an emphasis on elucidating the impacts of surface oxygen transfer (SOT), variable process loadings, and bioreactor operational conditions on nitrogen and phosphorus removal. Two sequencing batch reactors (SBRs) were operated in an anaerobic/aerobic/anoxic mode for over 250 days and fed real municipal wastewater. One SBR was operated with a headspace open to the atmosphere, while the other had a covered liquid surface to prevent surface oxygen transfer. Process performance was assessed for mixed volatile fatty acid (VFA) and acetate-dominated substrate, as well as daily/seasonal variance in influent phosphorus and ammonia loadings. Results demonstrated that post-anoxic BNR can achieve near-complete (>99%) inorganic nitrogen and phosphorus removal, with soluble effluent concentrations less than 1.0 mgN L−1 and 0.14 mgP L−1. Observed specific denitrification rates were in excess of typical endogenous values and exhibited a linear dependence on the glycogen concentration in the biomass. Preventing SOT improved nitrogen removal but had little impact on phosphorus removal under normal loading conditions. However, during periods of low influent ammonia, the covered reactor maintained phosphorus removal performance and showed a greater relative abundance of polyphosphate accumulating organisms (PAOs) as evidenced by quantitative real-time PCR (qPCR). While GAOs were detected in both reactors under all operational conditions, BNR performance was not adversely impacted. Finally, secondary phosphorus release during the post-anoxic period was minimal and only occurred if nitrate/nitrite were depleted post-anoxically. 相似文献
14.
15.
生物/化学组合工艺处理高盐榨菜废水的除磷效能 总被引:2,自引:0,他引:2
针对高盐度废水生物除磷的难点问题,采用生物/化学组合工艺处理高盐度、高磷、高氮的榨菜腌制废水,考察了运行工况、挂膜密度、排泥周期、药剂种类和投加量等对除磷效能的影响.试验结果表明:采用厌氧/生物除磷/生物脱氮/化学除磷组合工艺除磷高效、可行,当一级SBBR生物除磷单元的挂膜密度为60%、排泥周期为2 d、运行工况为进水(O.2 h)-厌氧(3 h)-好氧(6 h)-沉淀及排水(0.2 h),化学除磷单元按物质的量之比为9:1投加硫酸铝时,在进水COD及(PO3-4)-P分别为10 000 mg/L和38.5 mg/L的条件下,出水COD和(PO3-4)-P分别为90和0.1mg/L,去除率均达到了99%以上.生物除磷、生物脱氮、化学除磷单元的除磷分担率分别为56.6%、20.8%和22%. 相似文献
16.
亚硝酸盐对聚磷菌厌氧代谢的影响 总被引:1,自引:0,他引:1
以2种强化生物除磷(EBPR)系统中的活性污泥为研究对象,考察亚硝酸盐对聚磷菌厌氧代谢的影响,结果表明:不同EBPR系统中的聚磷菌对于亚硝酸盐的耐受能力不同。人工配水富集聚磷菌的活性污泥,当亚硝态氮浓度超过10 mg/L时,聚磷菌吸收VFA受到抑制, PHA的合成减少,磷酸盐的释放增加;处理生活污水的SBR短程脱氮除磷活性污泥,亚硝酸盐的浓度高达30 mg/L时,未对聚磷菌的厌氧代谢造成抑制,但引起异养反硝化菌与聚磷菌竞争VFA,导致PHA合成量和释磷量的减少。富集聚磷菌的活性污泥投加亚硝酸盐后P/VFA 相似文献
17.
18.
污水脱氮除磷处理中的化学药剂投加 总被引:1,自引:0,他引:1
污水处理厂脱氮除磷处理中,在各个工艺环节需要投加化学药剂。着重介绍了反硝化的碳源、生物除磷中挥发性脂肪酸、碱度、化学除磷药剂中的各种药剂投加方法的基本原理、投加量计算、操作要求以及投加量的控制。 相似文献
19.
The effect of pH on the competition between polyphosphate-accumulating organisms and glycogen-accumulating organisms 总被引:24,自引:0,他引:24
In enhanced biological phosphorus removal (EBPR) processes, glycogen-accumulating organisms (GAOs) may compete with polyphosphate-accumulating organisms (PAOs) for the often-limited carbon substrates, potentially resulting in disturbances to phosphorus removal. A detailed investigation of the effect of pH on the competition between PAOs and GAOs is reported in this study. The results show that a high external pH ( approximately 8) provided PAOs with an advantage over GAOs in EBPR systems. The phosphorus removal performance improved due to a population shift favouring PAOs over GAOs, which was shown through both chemical and microbiological methods. Two lab-scale reactors fed with propionate as the carbon source were subjected to an increase in pH from 7 to 8. The phosphorus removal and PAO population (as measured by quantitative fluorescence in situ hybridisation analysis of "Candidatus Accumulibacter phosphatis") increased in each system, where the PAOs appeared to out-compete a group of Alphaproteobacteria GAOs. A considerable improvement in the P removal was also observed in an acetate fed reactor, where the GAO population (primarily "Candidatus Competibacter phosphatis") decreased substantially after a similar increase in the pH. The results from this study suggest that pH could be used as a control parameter to reduce the undesirable proliferation of GAOs and improve phosphorus removal in EBPR systems. 相似文献