共查询到20条相似文献,搜索用时 78 毫秒
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克雷伯氏杆菌产生的絮凝剂处理垃圾渗滤液的研究 总被引:1,自引:0,他引:1
本文研究了克雷伯氏杆菌(Klebilla sp.)SLY08所产絮凝剂对垃圾渗滤液的絮凝效果,并对影响絮凝作用的主要因素进行了探讨。絮凝效果表明,在室温、pH7.0及助凝剂Al^3+存在下,该菌株所产生的絮凝剂不仅能有效去除废水中的悬浮固体,而且还能使废水脱色,其脱色率可高达61.8%。与常规絮凝剂相比,具有用量少、絮凝活性高的优点。 相似文献
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《流程工业》2006,(2):36-36
上海萨尔过滤设备有限公司生产的萨尔多袋式过滤器,全部采用优质的不锈钢材料制造。并采用独特的密封结构设计,配以特别设计的滤袋三脚卡紧盖和专业超声波工艺制作的热熔过滤袋,可确保过滤器本身及过滤过程的近乎100%无泄漏,精密铸件顶盖及导管形状使流体进入过滤状态更直接、快捷,极大地减少了紊流,再辅以合理、紧凑的管道连接和最大化过滤面积的全打磨抛光滤蓝,使得滤器本身内部及连接管道内部无杂质沉积,过滤效率高、运行成本低。过滤器各条焊缝质量均能达到德国汉堡焊接协会技术标准,使用安全可靠。另外,该产品采用侧进侧出导流方式,使得操作高度和空间大为降低,维护操作极为轻松、快捷,劳动强度减小,生产效率提高。 相似文献
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超纯水系统的预处理系统主要功能之一就是降低RO膜进水中的颗粒大小和含量,从这个层面来说,超纯水预处理系统就显得尤为重要。超纯水预处理系统主要分为混凝沉淀、砂滤、活性炭吸附。保安过滤等常规处理工艺。其中对颗粒的过滤主要有两个过滤点:一是粗滤,采用砂滤或者沉淀方法去除原水中大颗粒杂质;二是RO膜颗粒杂质过滤器,采用滤芯或者滤袋以除去原水中小颗粒杂质。颗粒杂质过滤器也称为保安过滤器,一个良好的保安过滤器可以大大提高RO膜进口水质,从而延长RO膜的使用寿命和降低化学再生频率,综合降低超纯系统的运行成本。 相似文献
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机械行业总排废水的再生回用 总被引:1,自引:0,他引:1
机械工厂中,对全厂总排废水全部处理的企业仅占11.4%,因而机械行业应大力推广应用废水再生回用技术。机械行业总排废水再生回用水站行之有效的工艺流程为混凝沉淀过滤及废水直接微絮凝过滤,其最佳工艺流程为废水直接微絮凝过滤,其投资仅为前者的50%~60%。废水回用既有直接的经济效益又有间接的经济效益。 相似文献
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《International journal for numerical methods in engineering》2018,113(9):1488-1506
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method. 相似文献
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A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils. 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa. 相似文献
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The end of over unit products of more than Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits beer wine yellow wine fruit syrup wine others cover over % of the national top-branded liquor products.…… 《中国标准化(英文版)》2008,25(1):30
The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.…… 相似文献
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Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster. 相似文献
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On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.…… 相似文献
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N.A. Odintsova N.V. Ageenko K.V. Kiselev N.M. Sanina E.Y. Kostetsky 《International Journal of Refrigeration》2006,29(3):387
We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes. 相似文献
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David R. Smith F. R. Fickett 《Journal of research of the National Institute of Standards and Technology》1995,100(2):119-171
Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability. 相似文献