基于数值模拟的城镇污水处理工艺筛选方法学

针对中国目前城市普遍面临的污水处理厂升级改造问题,该文构建了一套基于数值模拟的城镇污水处理工艺筛选方法学。该方法学包含一个污水处理单元技术数据库、污水处理单元组合规则、污水处理工艺流程生成模型、具备不确定性分析功能的工艺处理效果模拟模型,并考虑了不同进水条件和出水标准要求的模拟情景设计。以30种单元技术为例,对该方法学予以初步应用。结果表明,该方法可识别出我国目前主要的水质达标约束为总磷(TP)指标,当出水条件要求严格时(TP<0.5m g/L),反渗透成为优势技术。     

生物接触氧化法处理油田含聚污水室内模拟实验

在对胜利油田含聚污水水质分析和可生化性分析的基础上,在对含聚污水进行可生化性调整和生物膜的培养与训化后,运用生物接触氧化法进行了含聚污水处理现场模拟试验.监测了污水接种PM-1菌后聚丙烯酰胺的含量变化以及生化处理后污水中的油含量、悬浮物含量、CODCr、BOD5、平均腐蚀率和微生物种群随时间的变化.结果表明:经生化处理后的含聚污水基本达到回注水A级标准.由于污水中聚合物还不能被彻底降解,矿化度仍比较高,还要有相应的后处理.     

含载体乳化液膜对废水中三价铬的分离

文章研究了以杯[4]芳烃为流动载体,Span-80为表面活性剂,煤油为膜溶剂,NaOH溶液为内相的乳化液膜体系对含铬废水的三价铬的分离提取,考查了表面活性剂用量、传递时间、NaOH浓度、载体浓度、搅拌速度对分离效果的影响,确立了最佳的提取条件。     

奥曲肽在术后早期炎性肠梗阻治疗中的应用

目的探讨奥曲肽治疗术后早期炎性肠梗阻的临床效果。方法术后早期炎性肠梗阻患者96例,随机分为治疗组50例和对照组46例。治疗组在一般非手术治疗的基础上加用奥曲肽,观察胃肠减压液量、腹部症状、肛门排气时间、腹部平片改善等指标,对结果进行比较。结果治疗组胃肠减压量明显减少,肛门排气时间、腹胀消失时间、住院时间、腹部平片改善时间亦明显缩短。结论奥曲肽具有抑制消化道分泌,减轻肠壁水肿,加速炎症消退,促进肠蠕动等作用。奥曲肽治疗术后早期炎性肠梗阻方法简便,临床效果好,值得推广应用。     

光动力学疗法（PDT）中热疗辅助效果的探索

光动力学疗法(PDT)是一种正在发展中的激光医学技术,它在治疗人体的局部病变,特别是肿瘤方面,有着较为理想的效果.而在光动力治疗的同时,光纤头产生的热量又会对病变组织形成热疗的效果.研究了光纤头放置的位置对热疗辅助效果的影响,并给出了定量计算.     

不均匀地基上基础工程的优化处理措施

对于不均匀地基采用振冲挤密加固地基的侧向约束法,避免基础持力层埋深相差太大所引起地基变形和不均匀沉降,提高深基础承载力,同时增强地基整体抗滑稳定性.实践表明:在不均匀地基上的基础设计中充分利用场地中的一切有利因素,结合实际经验,采取最优化处理措施,能取得良好的工程效果,具有一定的工程应用价值和经济价值.     

铁矿石中全铁的分析方法改进

该文介绍了无汞测铁技术应用于铁矿石中全铁的测定新方法。用甲基橙作SnCl2还原Fe3＋的指示剂,再用K2Cr2O7标准溶液滴定亚铁。     

Research on the Geometry and Microstructure of the Coir Fiber

Coir fiber is derived from the coconut shells and considered to be an economical and natural material. In order to further extend its application fields,the geometry and microstructure of the coir fiber were thoroughly investigated in this research. The single fiber length measurement was carried out,and it was revealed that the length of the coir fiber was between 8 and 337 mm. Length distribution of the coir fiber was simulated by using the computer technology,and was found to be in coincidence with that ...     

Research and development of 780 MPa cold rolling TRIP-aided steel

As an industry-university cooperative project, an experimental research was conducted to develop a new cold-rolled transformation-induced plasticity (TRIP) steel with a tensile strength of 780 MPa and an elongation of 25% under the conditions that some processing parameters were preestablished according to the actual conditions of factory production lines. The optimal heat treatment conditions for obtaining excellent strength-ductility balance, specifically in intercritical annealing temperature and isothermal treatment temperature, were investigated by means of thermal simulation tests. Ultimately the desirable mechanical properties were attained successfully, and the microstructure and retained austenite stability were studied by optical microscopy (OM) and electron back-scattered diffraction (EBSD). It has been discovered that the sizes of retained austenite grains are generally proportional to the sizes of carbon-clear space (ferrite and bainite) around them, and there is marked selectivity in their transition sequences under stress-strain.     

Reduction of 1-3 mm iron ore by H2 in a fluidized bed

The reduction of 1-3 mm fine powder of iron ore by H₂ was conducted in a lab-fabricated kg class high temperature fluidized bed. The results show that the differential pressure in the fluidized bed, which has small fluctuation with time, increases with the increase of gas flowing velocity. The utilization ratio of gas decreases when the reaction lasts longer time indicating that the reaction is faster at the beginning of reduction and becomes slower in the latter process. The higher the reaction temperature is, the higher the utilization ratio of gas is, but the difference of utilization ratio among the different temperatures becomes smaller with time. The utilization ratio of gas and the metallization ratio can reach 9% and 84% respectively at 750℃ for 20 min, which shows the reduction reaction by H₂ is very fast. The increase of metallization ratio with gas velocity performs quite good linearity, which shows that a higher velocity of reducing gas can be used to improve the productivity of the reactor when H₂ is used as reducing gas. With the increase of charge height, the metallization ratio decreases, but the utilization ratio of gas increases. The reaction temperature can be reduced to 700-750℃ from 800-850℃ when H₂ is used as reducing gas.