EAC-UF系统制备优质饮用水的试验研究

采用压缩活性炭-超滤(EAC-UF)组合工艺处理微污染水制备优质饮用水,考察该工艺去除CODMn、Cl-、浊度和Fe3+的效果.结果表明,EAC-UF不仅能有效地去除有机物、浊度,对铁和Cl-也有较好的去除效果,且出水中悬浮物SS、细菌和大肠菌群数未检测出.该工艺运行稳定,出水水质满足GB 5749-2001要求.     

杨凌示范区水源地信息调查及管理对策

水资源是杨凌示范区发展的保障和制约因素,对杨凌示范区水源地综合情况进行了调查和分析。最后,对污染控制、水源地建设等方面提出了建议和对策。     

离子液体在萃取分离中的应用

在查阅了大量的国内外文献资料的基础上,介绍了近几年离子液体研究应用的进展。综述了离子液体在萃取分离过程中的应用,并展望了离子液体在分离方面的应用前景和发展方向。     

印染废水分离处理新技术研究进展

针对印染工业排放的废水对环境造成的严重污染问题,详细介绍了物理、化学和生物等分离技术对印染废水处理的现状,并提出了未来的发展趋势。     

几种生物芯片点样仪机械结构的对比

生物芯片点样仪生产厂家针对不同客户的需求,可以提供不同特性的产品。就市场上最常见的生物芯片点样仪生产厂家Genemachine,Biorobotics和Cartesian生产的四种生物芯片点样仪的机械结构做了介绍、分析和对比。在此基础上,研发出DY-2001型生物芯片点样仪。该机在整体性、占地面积、空间利用率、刚性、精度以及便于维修等方面做了全面考虑,不足之处是总重量稍大。     

Study on a novel flat renewal supported liquid membrane with D2EHPA and hydrogen nitrate for neodymium extraction

The Nd(III) extraction in flat renewal supported liquid membrane(FRSLM),with polyvinylidene fluoride membrane and renewal solution including HNO3 solution as the stripping solution and di(2-ethylhexyl) phosphoric acid(D2EHPA) dissolved in kerosene as the membrane solution,was investigated.The effects of pH in the feed phase,volume ratio of membrane solution to stripping solution,concentra-tion of HNO3 solution and concentration of carrier in the renewal phase on extraction of Nd(III) were also studied,respectively.As a result,the optimum extraction conditions of Nd(III) were obtained when concentration of HNO3 solution was 4.00 mol/L,concentration of D2EHPA was 0.100 mol/L,and volume ratio of membrane solution to stripping solution was 1.00 in the renewal phase,and pH was 4.60 in the feed phase.When initial concentration of Nd(III) was 2.00×10-4 mol/L,the extraction percentage of Nd(III) was up to 92.9% in 75 min.     

阶梯湿地基质不同粒径对净化农业生活废水的影响

湿地各参数对农业生活废水净化效果都有明显影响.研究采用阶梯湿地技术对农业生活废水进行净化,将四种不同粒径土壤(粒径A＜10 μm、10 μm＜粒径B≤100 μm、100 μm＜粒径C≤2000 μm和粒径D＞2000 μm)作为基质设置于湿地系统,研究在它们各自情况下湿地系统净化农业生活废水中主要污染物的能力.实验结...     

两相更新支撑液膜中金属二价镍的迁移行为研究(英文)

A novel disphase supplying supported liquid membrane(DSSLM),containing supplying feed phase and supplying stripping phase for transport behavior of Ni(II),have been studied.The supplying supported feed phase included feed solution and di(2-ethyhexyl) phosphoric acid(HDEHP) as the carrier in kerosene,and supplying stripping phase included HDEHP as the carrier in kerosene and HCl as the stripping agent.The effects of volume ratio of membrane solution to feed solution(O/F),pH,initial concentration of Ni(II) and ionic strength in the feed solution,volume ratio of membrane solution to stripping solution(O/S),concentration of H2SO4 solution,HDEHP concentration in the supplying stripping phase on transport of Ni(II),the advantages of DSSLM compared to the traditional supported liquid membrane(SLM),the system stability,the reuse of membrane solution and the reten-tion of membrane phase were studied.Experimental results indicated that the optimum transport of Ni(II) was ob-tained when H2SO4 concentration was 2.00 mol·L-1,HDEHP concentration was 0.120 mol·L-1,and O/S was 4:1 in the supplying stripping phase,O/F was 1︰10 and pH was 5.20 in the supplying feed phase.The ionic strength in supplying feed phase had no obvious effect on transport of Ni(II).When initial Ni(II) concentration was 2.00×10?4 mol/L,the transport percentage of Ni(II) was up to 93.1 % in 250 min.The kinetic equation was deduced in terms of the law of mass diffusion and the interface chemistry.     

La(III) Transport in Dispersion Supported Liquid Membrane Including PC-88A as the Carrier and HCl Solution as the Stripping Solution

The transport of La(III) through a dispersion supported liquid membrane with polyvinylidene fluoride membrane as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) in kerosene as the membrane solution, was studied. As a result, the optimum transport conditions of La(III) were obtained as that concentration of HCl solution was 4.0 mol/L, concentration of PC-88A 0.16 mol/L, and volume ratio of membrane to stripping solution 30:30 in the dispersion phase, and pH value 4.0 in the feed phase. Ionic strength had no obvious effect on the transport of La(III). Under the optimum conditions, when initial concentration of La(III) was 0.8′10-4 mol/L, the transport rate was up to 96.3% during the transport time of 125 min. The kinetic equation was developed based on the law of mass diffusion and theory of interface chemistry. The diffusion coefficient of La(III) in the membrane and the thickness of diffusion layer between feed and membrane phases were obtained as 3.20′10-7 m2/s and 3.22′10-5 m, respectively. The calculated results were in good agreement with experimental results.     

钛基TiO_2纳米管光电催化降解甲基橙

采用阳极氧化法制备了TiO2纳米管,并进行扫描电镜分析。以TiO2纳米管为工作电极,石墨作对电极,对甲基橙溶液进行光电催化降解研究,考察了阳极氧化电压、时间、热处理温度、电解液组成、外加偏压的影响。结果表明,阳极氧化电压为20 V,氧化时间20 min,热处理温度500℃,V(H3PO4)∶V(NH4F)=1∶1,外加偏压为0.6 V时,甲基橙(5 mg/L)经TiO2纳米管光电催化30 min,脱色率达到96.3%。