A study on the PP hollow fiber membrane contactor and its performances for removing ammonia from wastewater or mixed gas: I. Removal and recovery of ammonia from wastewater

2001 ◽  
Vol 1 (5-6) ◽  
pp. 185-194 ◽  
Author(s):  
Y. Xu ◽  
J. Wang ◽  
Z. Xu ◽  
H. Xu
Keyword(s):  
Transfer Coefficient ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Removal Rate ◽  
Ammonia Solution ◽  
Chemical Fertilizer ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
The Relationship

Recent research indicated that hydrophobic microporous hollow fiber membrane Contactor could be used to separate volatile contaminants from wastewater efficiently. The factors that influence the effect of separation of NH3/H2O are investigated carefully. It is found that the average diameter of micropores, porosity and gas penetration rate of polypropylene (PP) hollow fiber membrane are maximized synchronously at draw elongation 260%. The modules assembled with this PP hollow fiber membrane have good performance for separation of NH3/H2O. It is found that the overall mass transfer coefficient (K) only is dependent on the temperature and flux of ammonia solution and independent of the pressure and concentration of ammonia solution. Concentration of absorbing acid influences slightly the overall transfer coefficients K while the absorbent supply is sufficient. Under this condition, the relationship between transfer coefficient and raw ammonia water flow rate can be described using the Sieder and Tate equation. K is directly proportional to v1/3 (v stands for the flow rate of ammonia solution). The removal rate of NH3 was about 96-98% in the lab. Further industrial tests have been carried out individually in catalyst and chemical fertilizer factories to treat wastewater containing ammonium, whose concentration ranged from 1000-10,000g/m3. Wastewater treatment amount was 9.6 m3/day and 24 m3/day in catalyst and chemical fertilizer factories respectively. Average removal rate of NH3 was 93.5% during 5 months of continuous operation in the catalyst factory. The fouling is not heavy because the wastewater containing ammonia did not pass through the membrane wall. It is efficient to get rid of membrane fouling by washing the membrane with dilute acid and the cleanout period was 3 days. PP hollow fiber membrane can be produced by the melt-spinning and drawing method. This paper also investigates the relationship between processing condition of PP hollow fiber membrane and its structure and performance.

scholarly journals Optimization of CO2Absorption Characteristic under the Influence of SO2in Flue Gas by Hollow Fiber Membrane Contactor

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ziyi Qu ◽  
Li Zhang ◽  
Yunfei Yan ◽  
Shunxiang Ju
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Flow Rate Ratio ◽  
Absorption Characteristic ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

Hollow fiber membrane contactor is a new, highly efficient, and the most promising technology for CO2absorption in flue gas. There is still SO2that exists in the flue gas after desulfurization tower of power plant. This paper studied the influence of SO2on CO2absorption characteristic in flue gas by hollow fiber membrane contactor with absorbent of EDA, EDA + MEA (0.6 : 0.4), and EDA + MEA + PZ (0.4 : 0.4 : 0.2). The influences of SO2concentration, cycle absorption and desorption characteristic of absorbent, absorbent concentration, and liquid-gas flow rate ratio are studied to analyze the influence of SO2on CO2absorption characteristic. The appropriate absorbent composition ratio and appropriate parameter range that can inhibit the influence of SO2are proposed by studying the hybrid sorbent with activating agent, appropriate absorbent concentration, and ratio of liquid-gas flow rate. Among the three kinds of absorbents, EDA + MEA + PZ (0.4 : 0.4 : 0.2) had the best tolerance ability to SO2and the highest efficiency. With comprehensive consideration of CO2removal efficiency and operating cost, under the condition of 1000 ppm SO2, the appropriate concentration and liquid-gas flow rate ratio of EDA, EDA + MEA, and EDA + MEA + PZ are proposed.

scholarly journals Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 704
Author(s):  
Wei Yu ◽  
Xiaoyin Li ◽  
Fangyang Yuan
Keyword(s):  
Nitric Oxide ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Operating Temperature ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Gas Channel ◽  
Membrane Tube ◽  
Reduction Efficiency

A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

scholarly journals Effect of flow and module configuration on SO2 absorption by using membrane contactors

2018 ◽  
Vol 19 (4) ◽  
pp. 716-725 ◽  
Keyword(s):  
Liquid Phase ◽  
Phase Velocity ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Volume Fraction ◽  
Hollow Fiber Membrane ◽  
Absorption Efficiency ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
So2 Absorption

Sulfur dioxide (SO2) emissions lead to negative environmental impacts and it is considered as an indicator for the larger group of gaseous sulfur oxides (SOx) in the air. In this paper, the dimethylamine (DMA) solution was used as the absorbent in a α-Al2O3 hollow fiber membrane contactor that is operated under several conditions of gas velocity, liquid velocity, and 290 K operating temperature. The effects of gas and liquid phase properties and module configuration on SO2 absorption efficiency in the hollow fiber membrane contactor were investigated. Simulation results showed that the changes of gas phase velocity, liquid phase velocity, and concentration have great influences on the absorption efficiency of SO2. An increase of the gas flow rate decreases the SO2 absorption efficiency, while an increase of the liquid flow rate has the opposite effect, increasing the efficiency. Because gas in the membrane module stays for a longer time, more absorption time promotes the gas and liquid reaction. However, the changes of the volume fraction of SO2 in the mixed gas are not significant to SO2 absorption. The simulation model could provide guidelines for selecting suitable fluid properties during the SO2 absorption process in a hollow fiber membrane contactor.

scholarly journals Effect of Feed Gas Flow Rate on CO2Absorption through Super Hydrophobic Hollow Fiber membrane Contactor

2018 ◽  
Vol 316 ◽  
pp. 012012
Author(s):  
Sutrasno Kartohardjono ◽  
Kevin Alexander ◽  
Annisa Larasati ◽  
Ivander Christian Sihombing
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

scholarly journals Effects of Absorbent Flow Rate on Co2 Absorption through a Super Hydrophobic Hollow Fiber Membrane Contactor

2017 ◽  
Vol 8 (8) ◽  
pp. 1429 ◽  
Author(s):  
Sutrasno Kartohardjono ◽  
Angeline Paramitha ◽  
Aulia Andika Putri ◽  
Ryan Andriant
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Fiber Membrane

scholarly journals Development of mass and heat transfer coupled model of hollow fiber membrane for salt recovery from brine via osmotic membrane distillation

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Sher Ahmad ◽  
Gabriela Vollet Marson ◽  
Waheed Ur Rehman ◽  
Mohammad Younas ◽  
Sarah Farrukh ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Heat And Mass Transfer ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Membrane Distillation ◽  
Fiber Membrane ◽  
Salt Recovery ◽  
Osmotic Solution

Abstract Background In this research work, a coupled heat and mass transfer model was developed for salt recovery from concentrated brine water through an osmotic membrane distillation (OMD) process in a hollow fiber membrane contactor (HFMC).The model was built based on the resistance-in-series concept for water transport across the hydrophobic membrane. The model was adopted to incorporate the effects of polarization layers such as temperature and concentration polarization, as well as viscosity changes during concentration. Results The modeling equations were numerically simulated in MATLAB® and were successfully validated with experimental data from literature with a deviation within the range of 1–5%. The model was then applied to study the effects of key process parameters like feed concentrations, osmotic solution concentration, feed, and osmotic solution flow rates and feed temperature on the overall heat and mass transfer coefficient as well as on water transport flux to improve the process efficiency. The mass balance modeling was applied to calculate the membrane area based on the simulated mass transfer coefficient. Finally, a scale-up for the MD process for salt recovery on an industrial scale was proposed. Conclusions This study highlights the effect of key parameters for salt recovery from wastewater using the membrane distillation process. Further, the applicability of the OMD process for salt recovery on large scale was investigated. Sensitivity analysis was performed to identify the key parameters. From the results of this study, it is concluded that the OMD process can be promising in salt recovery from wastewater.

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