共查询到18条相似文献,搜索用时 62 毫秒
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以低COD/N人工模拟废水为基质,研究移动床生物膜反应器(MBBR)内同步硝化反硝化(SND)过程。进水COD和NH4+-N的质量浓度分别为200 mg/L和40 mg/L,以K1型填料为载体(填充率为40%),DO控制在3~4mg/L,20 d后有稳定的生物膜形成。生物膜完全成熟后,每个填料上平均生物膜量为33.5 mg,出水COD和NH4+-N去除率平均分别达86.68%和97.25%,NO2--N基本无累积,NO3--N的质量浓度均保持在5 mg/L以下,TN去除率在后期最高达90.6%,计算得到SND率达91.66%,结果证实在单一反应器内实现了良好的同步硝化反硝化过程。动力学模拟得出同步硝化反硝化过程中的NO3--N饱和常数为5.83 mg/L,大于单级反硝化过程中的硝酸盐氮饱和常数。 相似文献
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生物膜中同步硝化反硝化的研究进展 总被引:1,自引:0,他引:1
生物脱氮技术是一种经济、有效的方法,而生物膜同步硝化反硝化与传统生物脱氮技术相比具有很大的优势,发展潜力很大。结合国内外的研究现状,对生物膜SND现象的原理进行了分析,并探讨了影响生物膜中SND脱氮效率的影响因子,包括溶解氧、pH、碳氮比、ORP和微生物等因素;同时,针对不同生物膜载体选择对SND效果影响的最新研究,以及可降解生物膜载体的研究效果和优势进行了总结。最后,提出生物膜SND目前在应用中存在的有机碳源和溶解氧的问题,并指出了其进一步研究的目标和方向。 相似文献
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电极生物膜法是近年来发展起来的一项新型水处理技术,具有处理费用低,去除率高,效果稳定,易于控制等优点,在处理低浓度硝酸盐氮污染的地下水和饮用水等方面具有良好的效果。主要研究了不同的碳氮比和电流强度对反硝化脱氮效果的影响,并对硝酸盐氮的测定方法进行了研究。 相似文献
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在好氧条件下,向反应器中装填悬浮填料进行脱氮试验,考察生物膜法对氨氮和总氮的去除效果.结果表明:DO为3.0 mg.L-1时,氨氮平均去除率达到89.52%、总氮平均去除率达到29.46%.在好氧条件下,生物膜脱氮效果明显,硝酸盐氮的积累使反硝化过程成为脱氮的制约因素之一. 相似文献
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以疏水性无孔硅橡胶管为膜曝气组件,通过长期的运行试验,对硅胶膜曝气生物反应器中实现同步短程硝化反硝化的可行性进行了研究。结果显示:在温度为32℃,p H为7.5~8.0,溶解氧为0.5 mg/L,HRT为12 h,进水COD为300 mg/L,NH4+-N为60 mg/L时,SMABR具有最佳去除效果,此时出水NO2--N为7.3 mg/L,NO3--N未检测到,NH4+-N、TN、COD去除率分别为82.9%、71.0%、90.0%。研究结果表明:SMABR通过改变反应条件能稳定实现同步短程硝化反硝化。 相似文献
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采用序批式活性污泥法,通过控制溶解氧浓度开发出处理高氮豆制品废水的新工艺.实验结果显示,当曝气阶段反应器内溶解氧浓度保持在0.5 mg8226;L-1左右时,曝气过程中NO-2-N/NO-x-N的比率始终维持在93%以上,并且曝气结束时,有大约87.6%的氨氮是通过同步硝化反硝化途径去除的.因此,控制反应器内溶解氧浓度在0.5 mg8226;L-1左右时,在一个反应器内同时实现了亚硝酸型硝化反硝化和同步硝化反硝化.经过理论计算和机理分析,在此溶解氧下,亚硝酸菌的比增殖速率近似为硝酸菌的2.22~2.43倍,并且低溶解氧容易在活性污泥颗粒内形成进行反硝化作用的缺氧区.因此,在常温下,只要采用溶解氧传感器控制SBR反应器内溶解氧浓度在0.5 mg8226;L-1左右,就可以实现稳定的亚硝酸型同步硝化反硝化生物脱氮工艺. 相似文献
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Sequence hybrid biological reactor (SHBR) was proposed, and some key control parameters were investigated for nitrogen removal from wastewater by simultaneous nitrification and denitrification (SND) via nitrite. SND via nitrite was achieved in SHBR by controlling demand oxygen (DO) concentration. There was a programmed decrease of the DO from 2.50 mg·L^-1 to 0.30 mg·L^-1, and the average nitrite accumulation rate (NAR) was increased from 16.5% to 95.5% in 3 weeks. Subsequently, further increase in DO concentration to 1.50 mg·L^-1 did not destroy the partial nitrification to nitrite. The results showed that limited air flow rate to cause oxygen deficiency in the reactor would eventually induce only nitrification to nitrite and not further to nitrate. Nitrogen removal efficiency was increased with the increase in NAR, that is, NAR was increased from 60% to 90%, and total nitrogen removal efficiency was increased from 68% to 85%. The SHBR could tolerate high organic loading rate (OLR), COD and ammonia-nitrogen removal efficiency were greater than 92% and 93.5%, respectively,, and it even operated under low DO concentration (0.5 mg·L^-1) and maintained high OLR (4.0 kg COD·m^-3·d^-1). The presence of biofilm positively affected the activated sludge settling capability, and sludge volume index (SVI) of activated sludge in SHBR never hit more than 90 ml·L^-1 throughout the experiments. 相似文献
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碳氮比与氨氮负荷对序批式活性污泥法同步硝化反硝化的影响 总被引:1,自引:0,他引:1
为了提高生物脱氮的效率,研究采用序批式活性污泥法(SBR工艺)考察碳氮质量比w(C/N)与氨氮负荷对同步硝化反硝化的影响。结果表明:当w(C/N)为5.6,氨氮负荷为0.024 g/(g.d),碳源快速消耗,SBR工艺较难实现同步硝化反硝化,同步硝化反硝化率只能够达到0.76%。当w(C/N)为10.5,氨氮负荷为0.024 g/(g.d)时,SBR系统能够实现同步硝化反硝化,同步硝化反硝化率达到97.6%,NH4+-N和COD去除率均接近100%;当w(C/N)为16.3,氨氮负荷为0.024 g/(g.d)时,同步硝化反硝化率为94.5%,增加外加碳源的成本。同步硝化反硝化可以取代二段独立的硝化和反硝化过程,节省运行费用。 相似文献
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Fei Zhang Zhen He 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2012,87(1):153-159
BACKGROUND: Nitrogen removal using microbial fuel cells (MFCs) is of great interest owing to the potential benefits of bioenergy production. In this study, simultaneous nitrification and denitrification in dual‐cathode MFCs was investigated. RESULTS: The dual‐cathode MFCs investigated were capable of generating electricity and removing nitrogen, influenced by operating methods, nitrogen loading rates and external resistance. Depending on the ammonium concentration in the anode chamber, 84–97% of the ammonium nitrogen was removed via nitrification in the aerobic cathode. The removals of nitrate and total nitrogen were relatively low (~50%) at the influent ammonium concentration of 80 mg NH4+‐N L?1, but were significantly improved to more than 90% at a lower ammonium input (40 and 20 mg NH4+‐N L?1). When the electrode couples were electrically connected for different purposes, with high power output from the anode/aerobic cathode and high current generation from the anode/anoxic cathode, nitrogen removal was also improved. An investigation of aeration suggested that factors other than carbon supply, possibly inefficient reactor configuration, also limited the performance of the developed MFC. CONCLUSION: The experimental results demonstrated that the proposed pathway was feasible with effective nitrogen and organic removal. This study provided valuable information for the further development of a continuously operated dual‐cathode MFC system. Copyright © 2011 Society of Chemical Industry 相似文献
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为了提高生物脱氮效率,采用序批式生物反应器(SBR)处理模拟废水。在pH=7.0—8.5、温度10—15℃、溶解氧(DO)为3—5 mg/L、污泥浓度(MLSS)为(3 500±200)mg/L、ρ(NH4+-N)为50—70 mg/L条件下,分别考察蔗糖、醋酸钠和乙醇作为碳源对SBR工艺同步硝化反硝化(SND)脱氮效果和胞外聚合物(EPS)的影响。结果表明,蔗糖作为碳源时,当进水COD为370 mg/L时,COD去除率达到86%,SND率为88.3%,ρ(EPS)为659 mg/L;当醋酸钠作为碳源时,COD去除率达83.9%,SND率为68.8%,ρ(EPS)为742 mg/L;当乙醇作为碳源时,COD去除率仅为72.8%,SND率为58%,ρ(EPS)为736 mg/L。与醋酸钠和乙醇相比,蔗糖更适合作为低温下SBR工艺同步硝化反硝化的碳源。 相似文献