共查询到20条相似文献，搜索用时 718 毫秒
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近些年来,随着工业的发展,污水的成分趋于复杂化。由于污泥具备微生物生长的环境条件,而微生物在污泥中可以获得必要的养分。因此,可以将污水中的有害物质降解,达到净化污水的效果。在进行污水处理工艺中,活性污泥法成为了重要的手段之一。本文着重探究运用活性污泥法进行污水处理工艺的研究。 相似文献
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TTC-脱氢酶活性法测定污水厂污泥活性 总被引：1，自引：0，他引：1
为了快速测定活性污泥微生物的活性,选用脱氢酶活性作为反映污泥微生物活性的指标,并对影响脱氢酶活性的因素做了详细的分析与讨论。从而得出采用TTC─脱氢酶法测定污泥活性能及时地反映曝气池中污泥性的变化,适用于污水场的运行管理。 相似文献
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我国70%的污水处理厂都采用生物法处理污水。活性污泥法是最常用的生物法之一。活性污泥中微生物在净化污水的同时自身也生长繁殖,不断增加,使生物反应器中活性污泥浓度过高,导致污水中缺乏氧气,影响污水处理的效果。因此,必须定期排掉一定量的污泥,使生物反应器中活性污泥浓度保持在一定水平,排出的这部分污泥即为剩余活性污 相似文献
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大庆石化公司化工污水处理厂于1988年底建成并投入运行,设计处理能力2.4万m3/d,设计工艺为传统活性污泥法。在初次运行前活性污泥需要通过一定的方法培养与驯化,使微生物增殖,达到一定的污泥浓度,起到降解有机物染物的目的;驯化则是对混合微生物群进行淘汰和诱导,使具有降解废水活性的微生物成为优势。本文旨在对活性污泥系统出现的问题提出相应的解决对策。 相似文献
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在监测污水处理厂活性污泥系统的状态,控制其运行时,选用三磷酸腺苷(ATP)作为活性污泥系统微生物活性的指标,并系统考察了环境因素、负荷等对ATP的影响。实验结果表明,ATP能快速、准确地反映污泥的活性,该指标在污水厂的运行控制中有良好的应用前景。 相似文献
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正在污水处理厂,我发现又脏又臭的污水在处理池中"翻滚"后,最终变得很清澈。是什么神奇的力量实现了这种转变?原来是活性污泥中的微生物发挥了重要作用。活性污泥具有良好的吸附、分解有机物的能力及沉降性能。活性污泥首先对污水中的悬浮和胶体颗粒进行吸附,再通过微生物将吸附的有机物进行分解的同时产生新的细胞,最后在动胶菌属细菌等微生物的作用下形成菌胶团,在重力作用下沉降到底部,从而去除有机物。 相似文献
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《Journal of The Franklin Institute》2018,355(18):9108-9126
The swing temperature usually leads to the parameter drift and even failure in Electric power steering (EPS), which is a potential threat for safe driving of automobiles. Power Metal-Oxide-Semiconductor Field Effect Transistors (MOSFET) are a primary heat source in EPS and, therefore, can directly represent the temperature fluctuation of EPS. Existing technologies that observe the temperatures of MOSFETs are restricted by operating conditions, cost and implementation difficulty for application in automotive EPS systems. To address this issue, a novel real-time junction temperature observation method is proposed by combining a Foster network with an Extended State Observer (ESO) technique. Transfer paths of thermal resistance in EPS converters are analyzed, and the thermal state space model is established by the Foster network. The temperature ESO of the EPS controller is then developed based on this thermal model to estimate the temperature and perturbation. Confirmation tests that introduce a simulated driving steering method measure the MOSFET temperature and verify the validity of the temperature ESO. The test results demonstrate that the proposed temperature ESO can be used to monitor junction temperatures of MOSFETs in EPS. 相似文献
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BackgroundThe exopolysaccharides (EPS) produced by yeast exhibit physico-chemical and rheological properties, which are useful in the production of food and in the cosmetic and pharmaceutical industries as well. The effect was investigated of selected carbon sources on the biosynthesis of EPS by Candida famata and Candida guilliermondii strains originally isolated from kefirs.ResultsThe biomass yields were dependent on carbon source (sucrose, maltose, lactose, glycerol, sorbitol) and ranged from 4.13 to 7.15 g/L. The highest biomass yield was reported for C. guilliermondii after cultivation on maltose. The maximum specific productivity of EPS during cultivation on maltose was 0.505 and 0.321 for C. guilliermondii and C. famata, respectively. The highest EPS yield was found for C. guilliermondii strain. The EPS produced under these conditions contained 65.4% and 61.5% carbohydrates, respectively. The specific growth rate (μ) of C. famata in medium containing EPS as a sole carbon source was 0.0068 h-1 and 0.0138 h-1 for C. guilliermondii strain.ConclusionsThe most preferred carbon source in the synthesis of EPS for both Candida strains was maltose, wherein C. guilliermondii strain showed the higher yield of EPS biosynthesis. The carbon source affected the chemical composition of the resulting EPS and the contribution of carbohydrate in the precipitated preparation of polymers was higher during supplementation of maltose as compared to sucrose. It was also found that the EPS can be a source of carbon for the producing strains. 相似文献
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论企业竞争力与企业专利战略 总被引：6，自引：1，他引：6
本文在企业竞争力和企业专利战略两个重要问题的结合点上展开论述，以提高企业竞争力为出发点，分别讨论了企业专利战略中的法律战略、技术战略、信息战略． 相似文献
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通过对菌丝体生物量、胞外多糖产量、胞内多糖及虫草素进行测量分析,研究了不同水平的保幼激素Ⅲ对蛹虫草液体发酵培养的调控作用。在培养的早期阶段（1d）,保幼激素Ⅲ对蛹虫草菌丝体生长有明显的抑制作用,但其最终产量与对照组相比仍有一定程度的增加．其中高剂量组增加了14．3％。各处理组胞外多糖产量在培养3d后即达到对照组第7天的水平．而胞内多糖含量及虫草素含量在培养ld后迅速增加,与同期对照组相比分别达到140％和362％。各处理组在整个培养过程中的生长代谢节奏与对照组有差异性。胞内多糖及虫草素产量分析表明．保幼激素Ⅲ在12mg／L水平下使得虫草素产量增加了31．2％。但对胞内多糖产量无促进作用。结果表明．保幼激素Ⅲ改变了蛹虫草菌丝体生长代谢节奏,对处于特定菌龄期（5d）的蛹虫草生长代谢具有调控作用。 相似文献
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The steering torque of automobile EPS steering system is significant for driving steering control and good driving feel. Servo motor control and external interference moment are the core factors affecting EPS steering system. With the advancement of automotive technology, the requirements of EPS control technology have been gradually improved, and the driving and handling of vehicles at high speed have become the key issues. For the current EPS steering system at high speed vibration and steering feel, active disturbance rejection EPS torque control method is proposed, EPS variable mode controller was developed. The control of the variable mode is verified by experiment and the vibration torque from the road is controlled, determine the control frequency of 30 KHz, the amount of current fluctuation is the smallest. The ADRC (active disturbance rejection controller) technology is used to suppress the interference of the road surface, finally, the validity of active immunity is verified by bench test. Steering wheel vibration torque can be reduced by an average of 28.5% to 33.3%. 相似文献
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BackgroundRice sheath blight (caused by Rhizoctonia solani) and tobacco mosaic virus are very important plant diseases, causing a huge loss in global crop production. Paenibacillus kribbensis PS04 is a broad-spectrum biocontrol agent, used for controlling these diseases. Previously, extracellular polysaccharides (EPS) from P. kribbensis PS04 had been purified and their structure was inferred to be fructosan. This study aimed to evaluate the effects of exogenous EPS treatment on plant–pathogen interactions.ResultsPlant defense genes such as phenylalanine ammonia-lyase, catalase, chitinase, allene oxide synthase, and PR1a proteins were significantly induced by exogenous EPS treatment. Moreover, subsequent challenge of EPS-pretreated plants with the pathogens (R. solani or tobacco mosaic virus) resulted in higher expression of defense-associated genes. Increased activities of defense-associated enzymes, total phenols, and flavonoids were also observed in EPS pretreated plants. The contents of malondialdehyde in plants, which act as indicator of lipid peroxidation, were reduced by EPS treatment.ConclusionsThis study comprehensively showed that EPS produced from P. kribbensis PS04 enhances disease resistance in plants by the activation of defense-associated genes as well as through the enhancement of activities of defense-related enzymes.How to citeCanwei S, Xiaoyun H, Ahmed N, et al. Fructosan form Paenibacillus kribbensis PS04 enhance disease resistance against Rhizoctonia solani and tobacco mosaic virus. Electron J Biotechnol 2020;47. https://doi.org/10.1016/j.ejbt.2020.07.002 相似文献
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详细介绍了一个新的大样本集合预报系统. 为了减小ENSO(厄尔尼诺-南方涛动)预报中的预报不确定性,该集合预报系统首先基于一个中等复杂程度的耦合模式,利用集合卡尔曼滤波资料同化方法同化有效的海洋观测资料为集合预报系统提供集合初始场;同时,一个发展的用于12个月预报的一阶线性马尔可夫(Markov)随机误差模式被嵌套到集合预报系统中来模拟模式不确定性. 基于1992年11月~2008年10月100个样本的集合回报试验,从确定性预报技巧和概率预报技巧2个方面对集合预报系统的预报水平进行了检验. 该集合预报方法能够很有效地将传统的确定性预报扩展到概率预报领域,且检验结果表明,预报样本均值的预报水平要优于单一的确定性预报. 对于概率预报而言,集合预报样本能够很好地跟随观测的变化,并且能够提供单纯确定性预报所不能够提供的额外信息. 相似文献
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构建战略性新兴产业集群品牌生态系统有助于地方政府和企业创建和发展战略性新兴产业集群品牌。本文运用文献法、焦点小组访谈、实证研究逐级递进的研究方法,构建了一个由8个类别和33个关键要素构成的战略性新兴产业集群品牌生态系统,并验证了系统要素之间的关系,其中,品牌宏观要素、品牌产业要素、品牌资源要素、品牌支持要素正向影响品牌集群要素,品牌宏观要素、品牌产业要素、品牌集群要素正向影响品牌企业要素,品牌企业要素正向影响品牌市场要素,而品牌竞争要素与品牌企业要素呈负相关关系。 相似文献