玄武岩特征及熔融析晶性能研究

玄武岩纤维作为一种理想的高温烟气过滤材料,确定适宜产地的玄武岩以制备玄武岩纤维显得尤为重要.采用XRF、POM、XRD及TG-DSC方法,对取自黑龙江鸡西玄武岩样品的化学组成、表面形态及熔融析晶特性进行分析研究,为玄武岩纤维的制备提供理论依据.结果表明,其主要矿物成分为拉长石一钙长石,并含有部分辉石、橄榄石及蒙脱石.玄武岩样品的酸度系数为6.0;样品的熔融温度1 332℃、析晶温度1 262℃、纤维制备控制温度约为1 340℃.     

Removal of cadmium and zinc ions from aqueous solution by living Aspergillus niger

1 Introduction Heavy metals like copper, mercury, chromium, cadmium, lead, nickel and zinc cause serious threat to environment, animals and human for their extreme toxicity[1]. Many industries including metal plating, mining, battery, pigment, dyestuff a…     

垃圾渗滤液处理工艺中场龄影响分析

垃圾填埋场渗滤液因受降水、场龄等因素影响,水质水量变化较大.本文结合国内外工程实例,介绍了不同场龄渗滤液相应具有代表性的处理工艺,并通过比较这些处理工艺的机理、处理效果及优缺点提出了一些建议.     

刍议高职计算机教育存在的问题及对策

信息化时代的到来,使计算机的作用体现得越来越明显,高职计算机教育对于学生的社会适应以及综合能力的培养有着重要的意义。然而,当前的高职计算机教育还存在诸多问题,只有将这些问题解决,才能更好地推动高职计算机教育的发展。本文对其存在的问题进行了分析,并提出了相应的对策,希望能够改善当前高职计算教育教育状况,实现高职计算机教育的科学化。     

Tolerance and removal of chromium（Ⅵ） by Bacillus sp. strain YB-1 isolated from electroplating sludge

Four chromium（Ⅵ）-resistant bacteria named YB-1, YB-2, YB-3 and YB-4 were isolated from Cr-electroplating sludge. YB-1 and YB-2 were identified as a member of Bacillus sp. based on morphology and Biolog Microstation System. The strain of YB-1 was selected to test for its resistance and ability to remove Cr（Ⅵ） from aqueous solution. The results indicate that YB-1 exhibits high MIC value which can almost reach 140 mg/L and the growth of YB-1 in liquid medium containing 60 mg/L Cr（Ⅵ） is affected especially in the late exponential phase and stationary phase. Furthermore, the potential of living and freeze-dried YB-1 biomass to remove Cr（Ⅵ） was studied in different pH, biosorbent dose, contact time and initial concentration using the batch method. At the optimal conditions, living and freeze-dried biomass are capable of absorbing 34.5 mg/g and 17.8 mg/g chromium（Ⅵ） at initial concentration of 60 mg/L, respectively. The adsorption data were fitted to Langmuir isotherm model for these two sorbents. Kinetic studies show that the rates of sorption all follow the pseudo-second order kinetics.     

改性粉煤灰吸附废水中Cd2+、Pb2+、Cu2+的试验研究

采用改性后的粉煤灰为主要原料,对含Cd2 、 Pb2 、 Cu2 的模拟废水进行了吸附实验,结果表明.废水中Cd2 、 Pb2 、 Cu2 的初始浓度、粉煤灰用量、pH值、吸附时间等因素均能影响粉煤灰对Cd2 、 Pb2 、 Cu2 的吸附效果.在Cd2 、 Pb2 、 Cu2 初始浓度均为40mg/L, pH=7.搅拌3h,粉煤灰的投加量分别为14、10、12g/L的条件下,Cd2 、 Pb2 、 Cu2 的去除率分别达到96.53%、99.21%、97.49%.粉煤灰对Cd2 、 Pb2 、 Cu2 的吸附等温线符合Freundilich和Langmuir两种模式.     

改性新型Mn-硅藻土吸附电镀废水中铅锌的研究

锰基改性硅藻土在弱酸强碱及吸附不同浓度的Pb2 、Zn2 的条件下,锰离子基本不溶出。在静态条件下,研究了锰基改性硅藻土吸附重金属离子Pb2 、Zn2 的性能及适宜条件,结果表明,低离子强度、中偏碱性、室温环境均有利于吸附过程的进行,吸附平衡时间为30min,含Pb2 、Zn2 的电镀废水经改性硅藻土吸附后,废水中Pb2 、Zn2 的浓度达国家工业废水最低排放标准。饱和吸附了Pb2 和Zn2 的改性硅藻土,可利用CaCl2溶液进行再生。     

计算机系统程序设计的平台基础分析

随着计算机科学的广泛应用和发展,计算机系统程序设计的平台基础分析显得越来越重要。C语言以其本身自有的特征以及优点,成为了计算机系统程序设计的基础,从而被广泛的应用。本文主要围绕计算机系统程序设计的平台基础的功能以及特点进行阐述,基于C语言基础的计算机系统程序设计的特点和C语言的语法分析,以及计算机系统程序设计中的C语言结构分析四个个方面的内容展开论述。     

Influence factors analysis of removing heavy metals from multiple metal-contaminated soils with different extractants

Some key factors on the heavy metals removal efficiencies were studied when soil washing technology was used in the remediation of soils contaminated by multiple heavy metals. The results show that the dissolubilities of Cu and Zn are promoted by humic acids, but Pb and Cd are inhibited by humic acids; heavy metals in the clay are more difficult to be extracted than silt; the strong acidic soils can cause the protonation of EDTA and weaken its extracting ability; EDTA is effective for extracting Pb and Cd, while oxalate (OX) is effective for extracting Cu and Zn; and biosurfactant can be used as additive to improve the removal of some particular heavy metals. Foundation item: Project(20050532009) supported by the Doctoral Foundation of Ministry of Education of China; Projects(2006BAD03A1704, 2006BAD03A1706) supported by the National 11th-Five Technology Supporting Project     

Speciation of chromium in soil inoculated with Cr（Ⅵ）-reducing strain, Bacillus sp. XW-4

Cr(VI)-amended soil was inoculated with Cr(VI)-reducing strain, Bacillus sp. XW-4 and incubated at 28 °C in an incubator. Cr(VI) reduction, available Cr and Cr fraction in soils were studied. The results show that addition of Bacillus sp. XW-4 can promote Cr(VI) reduction, but inoculation of this strain has a negative effect on the decrease of available Cr content in soil. In controls (without this strain) amended with 100 and 200 mg/kg of Cr(VI), Cr(VI) contents decrease to about 41 and 92 mg/kg respectively after incubation of 4 d, while in soil inoculated with XW-4, Cr(VI) contents decrease to about 18 and 60 mg/kg, respectively. The content of available Cr in soils with inoculation of XW-4 is higher than that in controls. Chromium is partitioned into water soluble Cr, exchangeable Cr, precipitated Cr, Cr bound to organics and residual Cr. The highest content of Cr is observed in residual form and water soluble Cr is not detected for all treatments after 42 d, but the soils inoculated with Bacillus sp. XW-4 contain higher content of exchangeable Cr and lower content of precipitated Cr than the soil without the inoculum. Inoculation of Bacillus sp. XW-4 can increase chromium activity in soils. Foundation item: Project(20050532009) supported by the Doctoral Foundation of Ministry of Education of China; Project supported by Program for Changjiang Scholars and Innovative Research Team in University