摘要：简述了顶管工艺在给排水工程中的应用现状及技术要点,结合深圳城市轨道交通工程12号线某车站和某市政路快速化改造工程两个顶管施工项目案例,详细介绍了顶管工作井及顶管的设计思路和实施方案。

摘要：简述给排水管线改迁在不同阶段的工作内容、设计原则以及与其他专业协同设计过程中需要注意的问题,结合深圳市两个实际工程案例,阐述了前期工程中给排水管线改迁的设计思路和技巧。

摘要：采用优化的热碱法提取活性污泥中的胞外聚合物(EPS),探究Pb^(2+)和Cu^(2+)在EPS上的吸附规律,并采用傅里叶红外光谱仪(FTIR)、透射电镜(TEM)及X射线衍射仪(XRD)探讨其吸附机理。结果表明:p H值显著影响吸附效果,最适p H值为5~6,EPS的最佳投量为m(M^(2+))∶m(EPS)=1∶2,Pb^(2+)在前10 min即可完成快速吸附,而Cu^(2+)需20 min左右,EPS对Pb^(2+)和Cu^(2+)的理论最大吸附量分别为697和590 mg/g。FTIR分析表明,两种离子的吸附均涉及到羧基、羟基和磷酸基团,而Cu^(2+)的吸附还与氨基、亚甲基等官能团有关;TEM和XRD分析表明,EPS在吸附金属离子的过程中会形成水合磷酸盐,EDX能谱揭示了吸附中存在离子交换作用。

摘要：Magnetically recyclable porous sodium dodecyl sulfate(SDS)/Fe2O3 hybrids,which combine the porous structure of Fe2O3 and hydrophobicity of SDS,have been successfully synthesized for the first *** Fe2O3 has been first pyrolyzed from MIL-100(Fe)using a simple two-step calcination ***,the obtained porous Fe2O3 nanoparticles have been self-assembled with SDS molecules and yielded hydrophobic SDS/Fe2O3 *** porous SDS/Fe2O3 hybrids have been demonstrated to be highly efficient for the denitrification of pyridine under visible light *** pyridine removal ratio has reached values as high as 100%after irradiation for 240 *** the results of a series of experimental measurements,it was concluded that the superior photocatalytic performance of SDS/Fe2O3 hybrids could be attributed to(i)the fast electron transport owing to the unique porous structure of Fe2O3,(ii)the superior visible light absorption of Fe2O3 nanoparticles,and(iii)the“bridge molecule”role of SDS efficiently improving the separation and transfer across the interfacial domain of SDS/Fe2O3 of photogenerated electron-hole *** significantly,after the catalytic reaction,the SDS/Fe2O3 hybrids could be easily recovered using magnets and reused during subsequent cycles,which indicated their stability and recyclability.