Efficiencies and mechanisms of the chemical cleaning of fouled polytetrafluoroethylene (PTFE) membranes during the microfiltration of alkali/surfactant/polymer flooding oilfield wastewater

Zhang, Bing; Yu, Shuili; Zhu, Youbing; Shen, Yu; Gao, Xu; Shi, Wenxin; Tay, Joo‐Hwa

doi:10.1039/c9ra06745k

Cited by 14 publications

(3 citation statements)

References 54 publications

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“…The sponge ball method is a system in which a sponge ball made of polyurethane or other materials is inserted into the permeator for a few seconds to remove the contaminant from the membrane surface. However, this system can only be applied to tubular modules [ 37 , 39 ].…”

Section: Microfiltration Membrane Cleaning Methodsmentioning

confidence: 99%

Fouling and Chemical Cleaning of Microfiltration Membranes: A Mini-Review

2021

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Membrane fouling is one of the main drawbacks encountered during the practical application of membrane separation processes. Cleaning of a membrane is important to reduce fouling and improve membrane performance. Accordingly, an effective cleaning method is currently of crucial importance for membrane separation processes in water treatment. To clean the fouling and improve the overall efficiency of membranes, deep research on the cleaning procedures is needed. So far, physical, chemical, or combination techniques have been used for membrane cleaning. In the current work, we critically reviewed the fouling mechanisms affecting factors of fouling such as the size of particle or solute; membrane microstructure; the interactions between membrane, solute, and solvent; and porosity of the membrane and also examined cleaning methods of microfiltration (MF) membranes such as physical cleaning and chemical cleaning. Herein, we mainly focused on the chemical cleaning process. Factors affecting the chemical cleaning performance, including cleaning time, the concentration of chemical cleaning, and temperature of the cleaning process, were discussed in detail. This review is carried out to enable a better understanding of the membrane cleaning process for an effective membrane separation process.

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Section: Microfiltration Membrane Cleaning Methodsmentioning

confidence: 99%

Fouling and Chemical Cleaning of Microfiltration Membranes: A Mini-Review

2021

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“…Indeed, NaOH is a chemical that has been used to clean the PTFE to recover the membrane permeate flux. 26 The correlation between ammonia flux and pH of the feed side can also be seen in Figure 6a. An increased amount of ammonia transfer was found when the feed pH increased from 10 to 11.8.…”

Section: Effect Of Feed Ph On Ammoniamentioning

confidence: 72%

“…The reason might be that an increase in the feed pH by NaOH could reduce the membrane fouling of the negatively charged PTFE membrane as well. Indeed, NaOH is a chemical that has been used to clean the PTFE to recover the membrane permeate flux . The correlation between ammonia flux and pH of the feed side can also be seen in Figure a.…”

Section: Resultsmentioning

confidence: 95%

Influences of Permeate Solution and Feed pH on Enhancement of Ammonia Recovery from Wastewater by Negatively Charged PTFE Membranes in Direct Contact Membrane Distillation Operation

Kywe

Ratanatamskul

2022

ACS Omega

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This research investigated the feasibility of enhancing ammonia recovery from wastewater using a negatively charged poly(tetrafluoroethylene) (PTFE) membrane in a direct contact membrane distillation (DCMD) system. The influences of phosphate solution types (as the permeate solutions) and feed pH on ammonia recovery were analyzed. Three types of permeate solutions—DI water and two types of phosphate solutions (H 3 PO 4 and KH 2 PO 4 )—were investigated for recovery of ammonia gas on the permeate side. From the obtained results, the H 3 PO 4 solution was found to be the most suitable permeate solution to recover ammonia gas in the DCMD operation with the highest overall ammonia mass transfer coefficient of 7.4 × 10 –5 m/s, compared to values of 1.2 × 10 –5 and 2.4 × 10 –5 m/s for DI water and KH 2 PO 4 solution, respectively. Moreover, an increase in the H 3 PO 4 concentration from 0.3 to 0.5 M in the permeate solution also could significantly enhance ammonia recovery. With an increase in the feed pH from 10.0 to 11.8, the ammonia recovery could be enhanced to 92.98% at a pH of 11.8. Liquid ammonium phosphate fertilizer could be produced by the DCMD system with the use of 0.5 M H 3 PO 4 solution. Therefore, the DCMD process using a negatively charged PTFE membrane with an appropriate permeate solution is one of the challenging processes for ammonia recovery from wastewater to promote the circular economy concept.

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