共查询到19条相似文献,搜索用时 78 毫秒
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平行运行2组构型相同的低高径比SBR反应器,分别以高扩散性的NaAc(1~#反应器)和低扩散性的可溶性淀粉(2~#反应器)为单一碳源模拟生活污水,研究不同扩散性的两种碳源对生物除磷污泥颗粒化早期聚集特性的影响。结果表明:在培养初期可溶性淀粉(2~#反应器)通过絮凝作用最先在系统中形成粒径较大但疏松的絮体污泥,在培养后期NaAc(1~#反应器)能够显著加快污泥的聚集和颗粒化速度。反应器运行90d后,1~#系统初步实现了颗粒化,污泥粒径在200μm左右,颗粒污泥轮廓清晰,结构密实;2#系统污泥以絮体为主,粒径为50μm左右。两个系统中COD去除率均达90%以上,2~#反应器除磷率低于1~#反应器。1~#系统内Defluviicoccus(88%)占据绝对优势,除磷由Dechloromonas(5.46%)完成;2#系统优势菌属为Ornithinibacter(33.19%)和反硝化聚磷菌Tessaracoccus(38.34%)。 相似文献
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为探究适用于MPR的外碳源,实验通过3组微压反应器(MPR)并行运行,分别投加单一碳源,考察淀粉、葡萄糖和乙酸钠对MPR系统脱氮除磷的影响。结果表明,在实验运行条件下以淀粉为碳源能更有效地促进MPR系统的生物脱氮。通过典型周期历时分析发现,淀粉降解缓慢,在运行周期中保证了反硝化对碳源的需求,且具有较好的同步硝化反硝化作用,从而使系统获得了较好的脱氮效果。DO检测结果表明,以淀粉为碳源的MPR系统存在明显的DO分区,为同步硝化反硝化作用奠定了基础。EPS检测结果证实,以淀粉为碳源能促使活性污泥储存更多糖类物质,可为后续反硝化提供碳源。实验结果为MPR工艺外加碳源的选择及其实际应用推广提供借鉴和参考。 相似文献
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采用厌氧-好氧间歇运行模式,在SBR反应器中分别以丙酸钠、乙酸钠、葡萄糖、蔗糖为单一碳源对生物除磷颗粒污泥进行培养驯化,并考察不同碳源下除磷颗粒污泥对水中磷的去除效果,同时结合高通量测序,探究不同碳源驯化的生物除磷颗粒污泥中微生物种群结构的变化情况。结果证明:碳源为丙酸钠时,系统对磷的去除效果最佳。高通量测序结果表明:碳源对除磷颗粒污泥的微生物种群结构影响显著,以丙酸钠为碳源的颗粒污泥中聚磷菌(PAOs)占比最高;以乙酸钠为碳源的颗粒污泥聚糖菌(GAOs)占比最高;以蔗糖为碳源的颗粒污泥PAOs含量最低,对磷的去除效果最差。 相似文献
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针对城镇污水处理厂进水碳源不足,导致生物除磷效果难以稳定维持的问题,通过实验室小试与现场生产性试验相结合,分析了初沉池不同泥位条件下初沉、剩余混合污泥厌氧发酵产挥发性脂肪酸(VFAs)对生物除磷效果的影响。结果表明,当初沉池泥位由1.0 m增加到2.5 m时,初沉池出水VFAs质量浓度由17.8 mg/L提高到44.0 mg/L。后续改良AAO工艺厌氧段释磷量、好氧段吸磷量较低泥位分别增加了3.26、3.29 mg/L。初沉池2.5 m高泥位条件下,曝气池出水溶解态总磷(STP)质量浓度降为0.06 mg/L,仅为初沉池1.0 m低泥位时的1/2。对磷组分分析发现可溶性活性磷酸盐(SRP)去除率得到明显提升。研究可以为污水处理厂利用内碳源开发提高生物除磷效果提供技术支撑。 相似文献
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采用经乙酸钠驯化培养的具有吸放磷功能的活性污泥,考察了不同碳源类型对厌氧底物贮存和转化的影响,碳源包括乙酸/丙酸=1/2、乙酸/丙酸=2/1、丙酸、甲醇、乙醇、葡萄糖、淀粉及生活污水。试验结果表明,以乙酸和丙酸为碳源时,系统的底物贮存量较大,其中进水乙酸/丙酸=1/2条件下系统内PHA及PHB含量最多,为6.0mmolC.L-1及4.25mmolC.L-1,而乙酸/丙酸=2/1条件下PHV含量最多,为3.69mmolC.L-1。系统可以利用甲醇、乙醇、葡萄糖、淀粉及生活污水作为碳源物质进行底物贮存,贮存物以PHB为主,但贮存量较乙酸及丙酸低。以乙酸及丙酸为碳源时,磷的释放量随着丙酸含量的增加而升高,丙酸为单一碳源条件下,磷的释放量达到最大值,为16.53mg.L-1。以淀粉及生活污水为碳源时释磷量小,为3.56mg.L-1与6.75mg.L-1,而甲醇、乙醇及葡萄糖为碳源时考察的活性污泥没有表现明显的释磷特性。 相似文献
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采用乙酸/丙酸交替、葡萄糖、实际生活污水为碳源长期驯化的三个强化生物除磷系统,研究了不同碳源对磷的释放和聚羟基烷酸(PHA)转化的影响、聚磷菌种群结构以及微生物代谢PHA和糖原的厌氧化学计量学。结果表明,从182 d起三个系统均获得稳定的除磷性能,第300 d三个系统内聚磷菌所占全菌的比例分别达到:89%±3%、55%±3%、45%±4%。乙酸、葡萄糖、生活污水为碳源时,聚磷菌细胞内贮存聚羟基丁酸(PHB)和聚羟基戊酸(PHV),丙酸为碳源PHA完全由PHV组成,四种类型碳源都未检测到聚二甲基三羟基戊酸(PH2MV)的生成。计量学研究表明:聚磷菌吸收1 C-mol的乙酸,细胞内合成1.15 C-mol PHB,0.15 C-mol PHV,分解0.47 C-mol糖原;吸收1 C-mol的丙酸生成0.44 C-mol的PHV,分解0.271 C-mol的糖原;吸收1C-mol的葡萄糖生成极少量的PHB和0.16C-mol PHV,分解0.16 C-mol糖原;以实际生活污水为碳源,消耗1 mg的COD,合成0.98 mg PHB、0.13 mg PHV(以COD计)。当以乙酸为碳源时获得最高的厌氧释磷量及最大的释磷速率,分别为:134 mg·L-1和23.80 mg P·(g VSS)-1·h-1。以丙酸与葡萄糖为碳源时释磷速率相似,以生活污水为碳源的情况下释磷速率最小。 相似文献
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Donal Mulkerrins Clodagh Jordan Sinead McMahon Emer Colleran 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2000,75(4):261-268
Considerable research has been performed on biological nutrient removal (BNR) systems which remove the problematic nutrients, nitrogen and phosphorus, that cause eutrophication. This research focussed on setting up two laboratory‐scale anaerobic/anoxic/oxic (A/A/O) systems and investigating their reliability while undergoing various parameter changes. Pump failure, in the first trial, R1, led to a decrease in pH, exposure of the sludge to relatively low nitrate concentrations and reduction of the suspended solids concentration within the system. This adversely affected the phosphorus removal efficiency. Shock loading the system with increased influent phosphate concentrations for 56 days was shown to aid remediation of the phosphorus removal efficiency to values between 65 and 70% (w/w). The second trial, R2, highlighted the presence of bacteria capable of P‐uptake under anoxic conditions (in the presence of nitrate). The characteristic anaerobic P‐release was also evident. The bacteria responsible for phosphate uptake under anoxic conditions are thought to be the denitrifying phosphate removing bacteria (DPB). However, the presence of higher nitrate concentrations retarded the P‐removal efficiency to some extent. Secondary release of P was evident in the clarifier of the A/A/O system during the R2 trial and especially during times of increased nitrate concentrations in the system. Between 20 and 40% (w/w) of the P taken up in the oxic stage of the system was released in the clarifier at various stages throughout the trial. © 2000 Society of Chemical Industry 相似文献
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MinGu Kim George Nakhla 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(5):637-642
BACKGROUND: A novel membrane bioreactor (MBR) is described, employing an intermediate clarifier. Unlike the established function of a final clarifier in a conventional biological nutrient removal system, the role of an intermediate clarifier has rarely been studied. Thus, this work focused on explaining the fate of nutrients in the intermediate clarifier, as influenced by the hydraulic retention time (HRT) of the preceding anaerobic bioreactor. RESULTS: The system was tested with two different anaerobic/anoxic/aerobic biomass fractions of 0.25/0.25/0.5 (run 1) and 0.15/0.35/0.45 (run 2) using synthetic wastewater. The major findings of the study were that phosphorus (P) removal was affected by the role of the intermediate clarifier. In run 1, P was removed at a rate 0.16 g d−1 in the intermediate clarifier while in run 2, additional P was released at 0.49 g d−1. The nitrogen (N) removal efficiencies were 74 and 75% for runs 1 and 2 respectively, while P removal was 91 and 96%. P uptake by denitrifying phosphate accumulating organisms (DPAOs) accounted for 41–52% of the total uptake in the MBR. CONCLUSIONS: This study found that the intermediate clarifier assisted chemical oxygen demand (COD), N, and P removal. With respect to the fate of P, the intermediate clarifier functioned as an extended anaerobic zone when the HRT of the preceding anaerobic zone was insufficient for P release, and as a pre‐anoxic zone when the anaerobic HRT was adequate for P release. Copyright © 2008 Society of Chemical Industry 相似文献
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如何有效提高城市污水厂除磷效率一直是研究的热点,而反硝化除磷菌可以在碳源不足的条件下,通过“一碳两用”的方式同时实现反硝化脱氮和吸磷作用,是一种新型高效的技术.试验以啤酒废水为研究对象,验证了厌氧-缺氧-好氧(A2O)工艺中反硝化除磷现象的存在及其对系统脱氮除磷的影响.试验结果表明,A2O系统稳定运行时,反硝化聚磷菌在缺氧区可利用在厌氧段储存的PHB大量吸磷,同时氮也得到去除,计算表明缺氧除磷量可占厌氧总释磷量的71.3%,另外可节约曝气能耗25%.无论系统进水COD浓度从200 mg8226;L-1变化为400 mg8226;L-1,COD、总氮和总磷去除率总能保持较高水平,平均出水总氮和总磷浓度分别小于10 mg8226;L-1和0.30 mg8226;L-1.另外发现,过量曝气对系统除磷具有明显的影响,导致除磷效率降低,甚至会产生不吸磷现象,系统需要经过约一个污泥龄时间才能恢复其吸磷能力,所以应加强系统曝气的控制. 相似文献