生物发酵连续消毒自动控制系统实现与方法

以生物发酵生产过程中连续消毒工段自动控制系统的实现与方法为对象,并接合实例对自动控制与相关过程进行探讨,目的是提高对生物发酵生产过程中连续消毒自动控制系统的了解与认识,进一步完善自动控制系统的功能,推动生物发酵连续消毒自动控制系统的应用。     

海上油田内源微生物与表面活性剂复合驱油剂性能的研究

研究了内源微生物与表面活性剂的复合应用,一方面表面活性剂可以增强微生物及其代谢产物对剩余油的降黏乳化作用,另一方面微生物激活剂可以降低表面活性剂在储层泥质中的吸附损失和无效窜流,两者具有良好的协同作用。实验结果表明,表面活性剂HSB-12、OP-10与激活剂FP3显示出良好的配伍性,复合驱油剂FP3+HSB-12、FP3+OP-10的界面张力、乳化性及驱油效果明显好于单独驱油剂,采收率最高可增加9.67%。     

微生物对冰箱冷藏食品的影响研究

本文研究了微生物对冰箱冷藏食品的影响,研究表明,适冷菌在冰箱冷藏条件下可以生长繁殖,并引起食品腐败。在4℃冷藏条件下,新鲜生菜在冰箱冷藏室存放10天,在杀菌冰箱中生菜上的细菌总数由2.3×106cfu/g下降为4.6×104cfu/g,而在普通冰箱中,细菌总数由2.3×106cfu/g上升为为2.9×108cfu/g,普通冰箱食品上的细菌是杀菌冰箱食品上细菌的6304倍。研究表明,需要对冰箱冷藏食品进行微生物处理。     

紫外线中央空调系统消毒设备设计

本文对紫外线在空调系统的利用现状和途径进行分析,根据紫外线消毒原理,设计了一种针对中央空调系统空气消毒的新型管道紫外线消毒机.该设备紫外线分布均匀,强度提高,大于2003年"非典"时期国家公布的<建筑空调通风系统预防"非典"确保安全使用的应急管理措施>规定值的1.7倍,对空气中多种致病微生物的消毒效果大为提高.     

尿素施肥量对土壤微生物和酶活性的影响

不同肥料用量对土壤生物学过程的影响研究是肥域(际)土壤生态学研究的重要内容之一。本试验采用室内模拟培养试验,研究了不同尿素施肥量对潮土微生物数量和酶活性的影响。结果表明:放线菌和霉菌对尿素施肥量比较敏感,B(肥土比1:1500)施肥量就可以明显降低它们的数量,分别比不施肥(A)下降45.5%和32.2%。硝化细菌在D(肥土比1:400)施肥量时数量最大,之后随施肥量增加而下降,反硝化细菌随施肥量增加直线下降。土壤酶活性均在E(肥土比1:200)施肥量时发生明显变化,脲酶、中性磷酸酶和蔗糖酶活性急剧下降。     

微生物多糖PS—1231作高脊性泥料增塑剂的应用研究

提高高脊性泥料的可塑性是关系到发展高档瓷器，提高经济效益，增加出口创汇的技术关键，本研究根据微生物多糖ＰＳ－１２３１独特的理化性能，在深入探讨泥料增塑机理的基础上，以ＰＳ－１２３１多糖为主要成分，经过科学复配，研制出新型、高效的泥料增塑剂。山东淄博瓷厂在骨质瓷尼料中进行了生产性试验，结果表明：添加由微生物多糖ＰＳ－１２３１为主要成分配制的新型增塑剂，具有优良的增塑、增强效果。与生产中使用的羧甲基纤     

UVGI技术在洁净空调系统中的应用

本文介绍洁净空调(CC&AC)系统微生物污染的发生及危害,论述国內外紫外辐照消毒(UVGI Ultraviolet Germicidal Irradiation)技术在CC&AC系统中的研究及应用情况;并通过对各种空气消毒处理手段的对比,说明现代UVGI技术在控制微生物的生长传播和节能方面的重要性。     

生物选矿的应用研究现状及发展方向

本文综述了生物选矿应用的基础及概念，概述了国内外微生物选矿的应用研究现状．提出了微生物选矿的研究发展方向。     

Microbially Induced Cementation to Control Sand Response to Undrained Shear

Current methods to improve the engineering properties of sands are diverse with respect to methodology, treatment uniformity, cost, environmental impact, site accessibility requirements, etc. All of these methods have benefits and drawbacks, and there continues to be a need to explore new possibilities of soil improvement, particularly as suitable land for development becomes more scarce. This paper presents the results of a study in which natural microbial biological processes were used to engineer a cemented soil matrix within initially loose, collapsible sand. Microbially induced calcite precipitation (MICP) was achieved using the microorganism Bacillus pasteurii, an aerobic bacterium pervasive in natural soil deposits. The microbes were introduced to the sand specimens in a liquid growth medium amended with urea and a dissolved calcium source. Subsequent cementation treatments were passed through the specimen to increase the cementation level of the sand particle matrix. The results of both MICP- and gypsum-cemented specimens were assessed nondestructively by measuring the shear wave velocity with bender elements. A series of isotropically consolidated undrained compression (CIUC) triaxial tests indicate that the MICP-treated specimens exhibit a noncollapse strain softening shear behavior, with a higher initial shear stiffness and ultimate shear capacity than untreated loose specimens. This behavior is similar to that of the gypsum-cemented specimens, which represent typical cemented sand behavior. SEM microscopy verified formation of a cemented sand matrix with a concentration of precipitated calcite forming bonds at particle-particle contacts. X-ray compositional mapping confirmed that the observed cement bonds were comprised of calcite.     

Thermal,moisture and microbiological boundary conditions of slab-on-ground structures in cold climate

Coarse-grained fill or drainage layers beneath heated slab-on-ground structures are warm and moist throughout the year. According to the in situ measurements, the relative humidity of the fill layer is high at RH ≈100%$\approx 100\%$. High relative humidity of the fill layer is not a sign of an un-functional drainage or capillary break layer, but a natural boundary condition for a slab structure adjacent to the moist subsoil. Due to the favourable conditions, microbe growth is very common in fill layers. Fungal or bacterial growth, in general, was detected in 98% of the test specimens taken beneath the ground slabs of heated buildings. Indicator species, either fungal or bacterial, were detected in 79% of the specimens. Yet, no moisture damage related to the ground floors was ever detected or recorded in the test buildings. The high microbe concentration in the fill layer beneath ground slabs is not a sign of moisture damage, but a natural state of the moist and warm fill layer.