Biodegradation kinetic of organic compounds of acrylic fiber wastewater in biofilm

IntroductionBiofilmkineticmodelplaysanimportantroleintherationaloptimizationofbiofilmreactordesign ,operationandresearch .Whereas,itsapplicationinthedesignoffull scaleoperationsisfarfromreachingtheacceptancelevelbecausewhichiscomplicatedmathematicalentities.Theapproachofillustrationloadingcurvecanbeusedtodesignthebiofilmreactorandavoidthecomplexsolutionforequationgroupofthemodel.Fixedbiofilmsystemshavevariousadvantagesovermoreconventionalactivatedsludgeprocess,includingtheabilitytosupportavari…     

简述磁场在水处理中的应用

本文对近几年磁技术在水处理方面的应用研究进展进行了比较全面的总结.通过研究表明利用磁场的机械能效应、化学效应、生物效应等处理污水中的有机物和无机物,能够达到较好的效果;本文从上述角度分别阐述了磁场的作用机理和应用方式,较为全面的分析了不同废水在磁场作用下的作用结果,而且通过具体实例的对比说明了磁场作用的实际效果以及对现行工艺处理程度的加强;由于该技术性质较为独特,增强磁场和其他多能场的综合利用,对环境保护和能源节约具有重大意义.     

生物膜法除磷工艺及机理研究

试验结果表明 ,软性载体生物膜序批式工艺是行之有效的除磷工艺。该工艺除磷适合的载体装填密度为30 % ,水力停留时间为 9h ,其中厌氧 3h、好氧 6h。进水CODCr负荷从 0 2 7kg m3·d～ 1 32kg m3·d均可使除磷率达90 %以上 ,并可承受较高的CODCr负荷的增大。试验中 ,还就除磷的各影响因素做了系统地探讨。通过 2 ,4 二硝基苯酚的抑制实验 ,证实了生物除磷机理的观点 ,亦即 ,生物膜序批式反应器中磷的去除是由微生物的新陈代谢完成的     

西藏措勤尼雄地区地面磁法测量及其地质意义

在《西藏措勤-昂仁地区铁铜矿评价》工作中,安排了1∶ 5万地面磁法测量.地面ΔT表明：整个工区属磁异常区,表现出北西低、南东高的总趋势.通过对磁测资料的转换处理,发现磁场特征与青藏高原中西部航磁调查所反映的地球物理特征基本吻合,反映了全工区磁场的变化特征,证实了藏C-99-297航磁异常的存在,应为矿致异常,可以指导青藏高原中西部找矿工作.通过对磁测剖面数据的推断,结合异常查证,在全工区圈出一批具有找矿意义的异常,为今后该地区基础地质研究和矿产资源评价提供了可靠的地球物理资料,并为今后在青藏高原开展矿产资源评价工作提供了切实可行的工作思路.     

掺杂ZrO_2、TiO_2、γ－Al_2O_3对Pt、Pd／Al_2O_3燃烧

运用ＸＲＤ、ＢＥＴ、ＤＴＡ等测试技求，研究并考察了掺杂ＺｒＯ＿２、ＴｉＯ＿２、ｒ－Ａｌ＿２Ｏ＿３对Ｐｔ－Ｐｄ／Ａｌ＿２Ｏ＿３燃烧催化剂性能的影响，结果表明，ＺｒＯ＿２对Ａｌ＿２Ｏ＿３晶相的γ型转为α型有明显的抑制作用，而ＴｉＯ＿２的添入则起促进作用；高温引起催化剂活性下降的主要原因是作为第一载体的Ａｌ＿２Ｏ＿３的比表面积和孔容减少以及Ａｌ＿２Ｏ＿３晶态从γ型转为α型所造成的。     

厌氧-好氧移动床生物膜工艺处理冰淇淋废水的试验研究

研究了厌氧污泥复合床 好氧移动床生物膜反应器串联工艺 ,处理冰淇淋生产废水的工艺性能和影响因素。试验结果表明 ,在进水CODCr 浓度平均为 3 0 0 0mg L ,厌氧反应器容积负荷 7～ 2 0kg m3·d ,好氧反应器容积负荷 1～5kg m3·d ,系统总水力停留时间 13 1～ 2 8h的条件下 ,该串联工艺的CODCr总去除率大于 90 %     

Carrier detection of duchenne muscular dystrophy through analysis of dna from deciduous teeth of a dead affected child

The sister of a child affected by Duchenne muscular dystrophy (DMD) was referred for genetic counselling to assess the risk of her being a carrier. Her brother had died 15 years previously at the age of 8. There were no other affected males in the family. There were no methods for DNA investigation at the time of the child's death and the family had never been studied for linkage with polymorphic probes on the chromosomal region Xp21. The only tissue from which an assessment of the risk could be made by DNA linkage analysis was two of the child's deciduous teeth that the parents had kept. DNA was extracted using a protocol described for the recovery of ancient DNA from museum specimens and archaeological finds. Multiplex amplification did not reveal deletions in 19 exons spanning the hot-spot regions for deletions within the dystrophin gene in Xp21. Linkage analysis using three highly polymorphic microsatellites demonstrated that the sister had not received the X chromosome borne by her brother. These results show that DNA extracted from teeth is a reliable source for molecular diagnosis.     

Accumulation of Hg(II) by microbial biofilms on suspended particulate matter

Accumulation of Hg(II) by microbial biofilms on suspended particulate matter     

涡电流分选机理及应用

介绍了涡电流分选的物理原理,分析了导体所受的成分力.描述了涡电流分选装置的结构以及涡电流分选的应用领域.研究表明:涡电流分选机具有结构简单、质量轻、斥力强(可调节)、对物料的适应性强、分选效率高以及处理量大等优点,可在环境保护领域,特别是在有色金属再生行业推广使用.     

DNA-based prenatal carrier detection for group a xeroderma pigmentosum in a chorionic villus sample

DNA-based prenatal carrier detection of group A xeroderma pigmentosum (XP-A) is reported. Chorionic villus sampling was done at the tenth gestational week in a pregnant woman whose first child suffers from XP-A. Genomic DNAs from the villi, proband, and parents were PCR (polymerase chain reaction)-amplified using three sets of primers, because the PCR and a subsequent enzyme digestion with HphI, AlwNI, or MseI may detect the three most frequent mutations of the XP-A complementing gene (XPAC) in Japanese XP-A patients. The results showed that the proband is a homozygote and that the parents and fetus are heterozygotes for a base substitution at the 3′ acceptor site of intron 3 of XPAC, indicating that the fetus is a healthy carrier of XP-A. This is the first case of prenatal carrier detection of the disorder.