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SEPARATION OF THORIUM FROM YTTERBIUM WITH CYANEX272 BY USING A HOLLOW FIBER MEMBRANE EXTRACTOR

Acta Metallurgica Sinica(English Letters) 2001年第2期000卷 132-136页

作者： F.J. Zhang F. Luo D.Q. Li and Y.L. Wu (laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry The Chinese Academy of Sciences Changchun 130022 China) (state key Joint of environment simulation and pollution control Laboratory of Rare Earth Chemistry and Physics，Changchun Institute of Applied Chemistry，The Chinese Academy of Sciences，Changchun 130022，China State Key Joint of Environment Simulation and Pollution Control，Institute of Environment Sciences，Beijing Laboratory of Rare Earth Chemistry and Physics，Changchun Institute of Applied Chemistry，The Chinese Academy of Sciences，Changchun 130022，China

1. IntroductionThe methods of effectively separating and purifying rare earth metals have becomemore and more important in connection with increasing interest in the development ofnew advanced material by utilizing rare earth metals in a highly-purified state. Solventextraction is one of the most effective methods for separation and purification of rare earthmetals on an industrial scale[*** extraction technology of hollow fibber membrane (HFM) is a new kind of separation method as combined processes of ...

关键词： hollow fibber membrane(HFM) transfer his(2,4,4-trimethylpentyl) phosphinic acid (HBTMPP)

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Application of Microbial BOD Sensors in Marine Monitoring

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Marine Science Bulletin 2001年第1期3卷 69-73页

作者：张悦王建龙李花子施汉昌竺建荣 tate Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 tate Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 strain of yeast which can endure high osmotic pressure is employed for the sensitive material of the microbial BOD sensor. Two immobilization methods are used i.e. calcium alginate gel beads and PVA gel beads. The results show that the PVA gel beads is better. The influences of osmosis and heavy metal ions on the yeast entrapped in the PVA gel beads are also studied in the experiment.

A strain of yeast, which can endure high osmotic pressure, is employed for the sensitive material of the microbial BOD sensor. Two immobilization methods are used, I.e. Calcium alginate gel be ads and PV A gel beads. The results show that the PVA gel beads is better. The influences of osmosis and heavy metal ions on the yeast entrapped in the PVA gel beads are also studied in the experiment.

关键词： Biochemical oxygen demand, microbial sensor, yeast, immobilized cells, marine pollution, monitoring

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A WATER-COMPATIBLE PHENOLIC HYDROXYL MODIFIED POLYSTYRENE AS AN ADSORBENT FOR ADSORBING PHENOLIC COMPOUNDS FROM AQUEOUS SOLUTIONS

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Chinese Journal of Reactive Polymers 2001年第2期10卷 141-153页

作者： LI Aimin Zhang Quanxing Liu Fuqiang Fei Zhenghao Zhang Gencheng Chen Jinlong State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing UniversityNanjing 210093P.R.China Institute of Applied Chemistry&Environmental Engineering Department of ChemistryYancheng Teachers CollegeYancheng 224002JiangsuP.R.China

A water-compatible phenolic hydroxyl modified polystyrene adsorbent (AM-1) for adsorbing and removing phenolic compounds from aqueous solutions was prepared by covalent bonding of phenolic hydroxyl groups to the surface of porous polystyrene-divinylbenzene beads, this resin can be used directly without wetting process. A comparison of the sorption properties of the new resin and Amberlite XAD-4 toward four phenolic compounds, phenol, p-cresol, p-chlorophenol, and p-nitrophenol was made. The capacities of equilibrium adsorption of AM-1 for all four phenolic compounds increased around 20% over that of Amberlite XAD-4, which may be contributed to phenol hydroxyl group on the surface and the unusual pore distribution. At their dilute solution, the equilibrium adsorption capacities of AM-1 for phenol increased about 62% over that of Amberlite XAD-4, while equilibrium adsorption capacities of the other three phenolic compounds increased 4-35%, suggesting an advantage of AM-1 over Amberlite XAD-4 in the collection of phenol. Freundlich isotherm equations and isosteric adsorption enthalpies for the four phenolic compounds indicate a physical adsorption process on the Amberlite XAD-4 and AM-1 resins. Column studies for phenol show that AM-1 resin has excellent adsorption and desorption performance.

关键词： Polymeric adsorbent Phenolic compound Adsorption Synthesis Adsorption enthalpy.

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Bioaugmentation: a new strategy for removal of recalcitrant compounds in wastewater—a case study of quinoline

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Journal of environmental Sciences 2000年第1期12卷 24-27页

作者： HAN Li-ping WANG Jian-long SHI Han-chang QIAN Yi State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

To demonstrate the feasibility of using bioaugmentation to enhance biodegradation of quinoline, four strains capable of using quinoline as sole source of carbon, nitrogen and energy were isolated from different environmental samples by enrichment technique. Screening for quinoline degrader with the highest quinoline mineralizing rate was carried out in respirometer and one bacterium identified as \%Burkholderia pickettii W2\% was chosen as inoculum in bioaugmentation tests. Quinoline biodegradation experiment results showed that this bacterium degraded quinoline very quickly. 100, 200 and 500 mg/L quinoline can be transformed completely within 1, 2 and 7 hours respectively. A bioaugmentation procedure was proposed and laboratory experiments confirmed that bioaugmentation was an effective way to improve the performance of traditional wastewater treatment facilities for quinoline removal. The effect of inoculum size on bioaugmentation was also investigated in this paper.

关键词： bioaugmentation biodegradation quinoline inocula CLC number: X703 Document code: A

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Performance of Submerged Membrane Bioreactor for Domestic Wastewater Treatment

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Tsinghua Science and Technology 2000年第3期5卷 237-240页

作者：黄霞桂萍钱易 State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

In the present research, a submerged membrane bioreactor was tested to treat domestic wastewater. Three experimental runs were conducted all with a hydraulic retention time of 5h and sludge retention times (SRTs) of 5, 10, and 20 d. The pollutant removal performance of the membrane bioreactor, the membrane effluent quality, and a kinetic model for sludge growth in the bioreactor were investigated. The combined process was capable of removing over 90% of both COD (chemical oxygen demand) and NH 3 N on the average. The total removal for COD was almost independent of SRT, but that for NH 3 N improved with increasing SRT. Membrane effluent quality meets the water quality standard for reuse issued by the Ministry of Construction of China. Increasing SRT causes the concentrations of suspended solids (SS) and volatile suspended solids (VSS) in the bioreactor to increase. However, the ratio of VSS/SS did not change much. Kinetic analysis showed that the sludge yield coefficient (kg VSS·kg COD -1 ) and the endogenous coefficient of microorganisms were 0.25 and 0.04d -1 , which are similar to those of the conventional activated sludge process. 

关键词： submerged membrane bioreactor domestic wastewater treatment pollutant removal performance effluent quality sludge retention time sludge growing kinetics

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Ceramic Ultra Filtration Membrane Bioreactor for Domestic Wastewater Treatment

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Tsinghua Science and Technology 2000年第3期5卷 283-287页

作者：文湘华邢传宏钱易 State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental Engineering Tsinghua University Bcljing 100084 China

A long term domestic wastewater treatment experiment was conducted using a recirculating ceramic ultra filtration membrane bioreactor (CUFMB) system. Three experiments were run with a hydraulic retention time of 5h, sludge retention times of 5d, 15d, and 30d and a membrane surface flow rate of 4m/s. The experiment studied the membrane fouling mechanism and cleaning techniques. The results show that a CUFMB system can provide continuous good quality effluent which is completely acceptable for reuse. The system is also not affected by fluctuations of the inlet flow. The CUFMB sludge loading rate is similar to that of conventional biological treatment units. However, the volumetric loading rate of the CUFMB is 24 times that of conventional biological treatment units. Membrane fouling occurs due to channel clogging, which could be easily removed, and surface fouling, which can be effectively removed using the method described in this work which includes water rinsing, base cleaning, and acid washing. 

关键词： ceramic membrane bioreactor ultra filtration hydraulics membrane fouling cleaning

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STUDY ON THE TREATMENT OF INDUSTRIAL WASTEWATER CONTAINING TRIETHYLAMINE WITH POLYMERIC ADSORBENTS

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Chinese Journal of Reactive Polymers 2000年第2期9卷 174-180页

作者： LV Lu PAN Bingcai ZHANG Weiming CHEN Jinlong ZHANG Quanxing The State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093P.R.China

The treatment of the industrial wastewater, in which the concentration of triethylamine (TEN) and CODcr was around 3450 mg/L and 22400 mg/L respectively, was studied by adsorption of macroporous resins. Results demonstrate that the polymeric adsorbent CHA-111 has excellent effect on the adsorption and desorption of TEN. The concentration of TEN in the effluent is less than 30mg/L, and the removal efficiency of TEN and total CODcr exceed 99% and 95% respectively. The accumulation and resource reuse of TEN can be realized in this process.

关键词： Adsorption Polymeric adsorbent Triethylamine Wastewater treatment

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Bioadsorption of 4-Chlorophenol to the Activated Sludge

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Tsinghua Science and Technology 2000年第3期5卷 241-245页

作者：王建龙 Nigel Horan Ed.Stentiford 钱易 State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China School of Civil Engineering Leeds University LS 9JT UK

The adsorption behaviour of 4 chlorophenol from aqueous solution to activated sludge was quantitatively characterized in this paper. The effects of the initial pH values, initial chlorophenol concentration and adsorbent dosage on bioadsorption were investigated. The maximum adsorption capacity was found to be 110.5 mg/g at 100 mg/L initial concentration. The Freundlich and Langmuir adsorption isotherms were applied to describe the biosorption processes and the isotherm constants were evaluated. 

关键词： 4-chlorophenol priority pollutant bioadsorption activated sludge

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Distribution, removal and chemical forms of heavy metals in polluted rice seed

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Toxicological and environmental Chemistry 2000年第3-4期76卷 137-145页

作者： He, Mengchang Yang, Jurong Cha, Yan State Key Joint Laboratory of Environmental Simulation and Pollution Control Institute of Environmental Sciences Beijing Normal University Beijing 100875 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Institute of Environmental Sciences Beijing Normal University Beijing 100875 China

In this paper, the distribution, removal and binding forms of heavy metals in polluted seeds of rice were studied using the methods of histochemistry and biochemistry. The results indicate that the distribution of heavy metals in rice grains was very uneven. The heavy metals in rice grains chiefly exist in association with the parts of high protein. Separation of proteins by Sephadex chromatography and subsequent analysis by atomic absorption spectroscopy revealed that Cd, Pb and As were mainly bound to protein of 54.5 and 5.50 kD molecular weights. During the rice processing, the concentrations of heavy metals in the edible rice decrease greatly, for some heavy metals in these parts of chaff, coarse rice bran and fine rice bran were removed.

关键词： Binding forms Distribution Food processing Gel chromatography Heavy metals Rice grains

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Progress in the high-order-accurate finite difference methods for fluid flow and heat transfer

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Progress in Natural Science:Materials International 1999年第11期9卷 2-12页

作者：杨志峰王? Beijing 100875 Beijing Normal University China State Key laboratory of Environment Simulation & Pollution Control

With a review of advances in the high-order-accurate finite difference methods for fluid flow and heat transfer, the practical limitations of the existing methods are analyzed and the key evolution trends are noted. Emphasis is put on the compact finite difference methods such as the optimal difference methods and perturbational difference methods developed recently. Some conclusions are finally given.

关键词： finite difference method high accuracy advances

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