共查询到20条相似文献,搜索用时 187 毫秒
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将悬浮填料装填入格网,制成体积一定的悬浮填料单元。分别投入曝气池的厌氧区和好氧区,形成悬浮填料和活性污泥复合工艺中试系统。然后,考察在复合系统在不同填料填充率、曝气量和水力停留时间的氨氮去除率。我们发现最优条件下,氨氮去除率较高,复合系统最稳定。最优条件为:填充率为35%;好氧段曝气量为5 m3/h,厌氧段曝气量为0.3 m3/h;水力停留时间为8 h。在此条件下,氨氮去除率比活性污泥工艺提高了18%。 相似文献
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方形与球形聚氨酯填料用于MBBR处理混合污水的研究 总被引:2,自引:0,他引:2
分别利用方形和球形聚氨酯填料作为移动床生物膜反应器(MBBR)的载体,并研究和比较其串连和并联处理混合污水的效果,研究表明,MBBR系统运行稳定,处理效果良好,串连MBBR对COD和NH3-N的去除率分别可达73%和97%;填充球形填料的MBBR能更有效地去除COD和NH3-N,且对水质变化适应性更强。试验结果为选择更合理、有效的填料应用于MBBR方式提供依据。 相似文献
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2套组合折流板反应器系统处理生活污水的启动运行 总被引:1,自引:0,他引:1
以厌氧污泥为种泥,采用2套填充不同填料的兼氧-厌氧组合ABR为反应器,考察了填充不同填料组合系统处理生活污水的启动运行。结果表明,当温度在25~35℃时,进水体积流量约为0.40 m3/d、HRT为24 h时,连续运行65 d后,组合单元中2种填料表面均形成一层均匀而致密的深褐色菌膜;稳定运行时,填充悬浮球型填料的组合ABR和填充组合填料的ABR对生活污水中COD的平均去除率分别为66.5%和70.1%,对SS的平均去除率分别为90.9%、92.0%,出水COD和SS含量均达到GB 18918-2002二级排放要求,且填充组合填料的系统对COD、SS、TN及TP的去除率效果均优于填充悬浮球填料的系统。 相似文献
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Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
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采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。 相似文献
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In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
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研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献