The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air f...The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air floatation method in water quality maintenance with the eco-landscape pool of Zhongxing Mangrove Bay as the study object,so as to provide a scheme for maintaining the water quality of artificial lakes.展开更多
In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase st...In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase stiffness of the floatation cushion. Gas film pressure distribution and carrying capacity of the floatation cushion are studied through theoretical analysis and by using the overlapping stitching technique. The carrying capacity and stiffness were obtained by using the coupling procedure of the gas lubrication governing equation and elastic deformation of the membrane governing equation. The results of theoretical calculations can obtain a conclusion that the effect of the gas pressure makes the annular elastic membrane elastically deform that brings about changes of throttling area and pressure groove depth of the floatation cushion. It makes carrying capacity and stiffness of the new style floata- tion cushion markedly improve over the conventional flotation cushion. The new floatation cushion has a wider ap- plication and popularization of space. Key words： floatation cushion; variable-section pressure equalizing groove;stiffness展开更多
A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN an...A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN and CTMAB to form insoluble ternary ion-association complex, and the precipitate can float on the surface of the liquid phase. A good linear relationship is observed between the floatation yield (E%) of Zn(II) and the amount of CTMAB. On the ground, CTMAB can be indirectly determined by determining E% of Zn(II). The results were satisfactory.展开更多
A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydr...A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydrophobic complex composed of Mg（II） and TC was floated into organic phase under the optimal conditions： pH=10, the floatation equipment is home-made, n-propyl alcohol as the organic solvent, sodium chloride as the separating phase reagent. The data were obtained by spectrophotometry after floatation; The linear regression equation is A=2.33×10^5C（mol/L）＋0.2179, linear range is from 3.77×10^-7mol/L to 6.32×10^-5 mol/L, respectively, with thecorrelation coefficient （r） better than 0.9997, relative recoveries is 99.7% to 100.3%, limit of detection was 4.29×10^-5mol/L, The method can be applied to analyse the trace TC in water sample, the result is better.展开更多
The removal of microplastics(MPs)from water using oil has shown early promise;however,incorporation of this technique into a feasible in situ method has yet to be developed.Here,a simple yet effective method of MP cap...The removal of microplastics(MPs)from water using oil has shown early promise;however,incorporation of this technique into a feasible in situ method has yet to be developed.Here,a simple yet effective method of MP capture from water using vegetable oil with bubbles is demonstrated to achieve high removal efficiencies of>98%.Comparisons are made with other methods of agitation,and higher removal efficiencies are observed when bubbles are used.Due to the low agitation provided by the bubbles,the oil layer remains unbroken,meaning that no oil is released into the bulk water phase.In this way,secondary contamination is avoided—unlike membrane filtration,another effective removal method,in which polymer-based membranes can break down due to chemical backwashing and ageing.It is demonstrated that variation in MP size within the micrometer range(50–170 lm)has minor impact on the removal efficiency;however,100%removal is achieved for larger,millimeter-sized MPs(500–5000 lm).Similarly,a high removal efficiency of greater than 99%is achieved in the capture of microfibers.Other factors such as oil volume and water salinity are also investigated and discussed.Based on these results,the proposed method can be introduced into multiple setting types as a passive and continuous method of MP capture.展开更多
为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五...为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五阶非线性波理论,建立了一套针对入水冲击问题的数值计算方法,并采用速度边界法进行造波。经验证,试验与数值结果在下落位移上对比差异较小,该数值方法可靠有效,且造波结果与Stokes五阶非线性波理论吻合较好。然后,基于构建的数值方法,在不同波浪环境下对带助浮装置航行体下落入水冲击过程进行了数值模拟,计算带助浮装置航行体冲击过程的位移、速度、加速度以及助浮装置受力情况,分析冲击过程中航行体的运动学参数、动力学参数以及入水空泡流场演化过程,总结了波浪环境下带助浮装置航行体的入水冲击特性。结果表明,波浪环境对下落冲击过程的影响主要体现在运动衰减段,水平方向的冲击相较于垂直方向的冲击受到波浪环境的影响要大得多,不同海况对航行体的水平冲击造成的影响主要是通过影响入水空泡的形成与溃灭过程实现的。展开更多
文摘The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air floatation method in water quality maintenance with the eco-landscape pool of Zhongxing Mangrove Bay as the study object,so as to provide a scheme for maintaining the water quality of artificial lakes.
文摘In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase stiffness of the floatation cushion. Gas film pressure distribution and carrying capacity of the floatation cushion are studied through theoretical analysis and by using the overlapping stitching technique. The carrying capacity and stiffness were obtained by using the coupling procedure of the gas lubrication governing equation and elastic deformation of the membrane governing equation. The results of theoretical calculations can obtain a conclusion that the effect of the gas pressure makes the annular elastic membrane elastically deform that brings about changes of throttling area and pressure groove depth of the floatation cushion. It makes carrying capacity and stiffness of the new style floata- tion cushion markedly improve over the conventional flotation cushion. The new floatation cushion has a wider ap- plication and popularization of space. Key words： floatation cushion; variable-section pressure equalizing groove;stiffness
文摘A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN and CTMAB to form insoluble ternary ion-association complex, and the precipitate can float on the surface of the liquid phase. A good linear relationship is observed between the floatation yield (E%) of Zn(II) and the amount of CTMAB. On the ground, CTMAB can be indirectly determined by determining E% of Zn(II). The results were satisfactory.
基金National Nature Science Foundation Project (20777029)Jiangsu Higher Education Institution Nature Science Foundation Project (07KJB610021)
文摘A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydrophobic complex composed of Mg（II） and TC was floated into organic phase under the optimal conditions： pH=10, the floatation equipment is home-made, n-propyl alcohol as the organic solvent, sodium chloride as the separating phase reagent. The data were obtained by spectrophotometry after floatation; The linear regression equation is A=2.33×10^5C（mol/L）＋0.2179, linear range is from 3.77×10^-7mol/L to 6.32×10^-5 mol/L, respectively, with thecorrelation coefficient （r） better than 0.9997, relative recoveries is 99.7% to 100.3%, limit of detection was 4.29×10^-5mol/L, The method can be applied to analyse the trace TC in water sample, the result is better.
基金start-up financial support from the School of Engineering,Newcastle UniversityEngineering and Physical Sciences Research Council(EPSRC)for his Doctoral Training Partnership(DTP)studentship.
文摘The removal of microplastics(MPs)from water using oil has shown early promise;however,incorporation of this technique into a feasible in situ method has yet to be developed.Here,a simple yet effective method of MP capture from water using vegetable oil with bubbles is demonstrated to achieve high removal efficiencies of>98%.Comparisons are made with other methods of agitation,and higher removal efficiencies are observed when bubbles are used.Due to the low agitation provided by the bubbles,the oil layer remains unbroken,meaning that no oil is released into the bulk water phase.In this way,secondary contamination is avoided—unlike membrane filtration,another effective removal method,in which polymer-based membranes can break down due to chemical backwashing and ageing.It is demonstrated that variation in MP size within the micrometer range(50–170 lm)has minor impact on the removal efficiency;however,100%removal is achieved for larger,millimeter-sized MPs(500–5000 lm).Similarly,a high removal efficiency of greater than 99%is achieved in the capture of microfibers.Other factors such as oil volume and water salinity are also investigated and discussed.Based on these results,the proposed method can be introduced into multiple setting types as a passive and continuous method of MP capture.
文摘为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五阶非线性波理论,建立了一套针对入水冲击问题的数值计算方法,并采用速度边界法进行造波。经验证,试验与数值结果在下落位移上对比差异较小,该数值方法可靠有效,且造波结果与Stokes五阶非线性波理论吻合较好。然后,基于构建的数值方法,在不同波浪环境下对带助浮装置航行体下落入水冲击过程进行了数值模拟,计算带助浮装置航行体冲击过程的位移、速度、加速度以及助浮装置受力情况,分析冲击过程中航行体的运动学参数、动力学参数以及入水空泡流场演化过程,总结了波浪环境下带助浮装置航行体的入水冲击特性。结果表明,波浪环境对下落冲击过程的影响主要体现在运动衰减段,水平方向的冲击相较于垂直方向的冲击受到波浪环境的影响要大得多,不同海况对航行体的水平冲击造成的影响主要是通过影响入水空泡的形成与溃灭过程实现的。
