Characterization and analysis of inorganic foulants in RO membranes for groundwater treatment

Agnihotri, Bhuvneshwar; Sharma, Aditya; Gupta, Akhilendra Bhushan

doi:10.1016/j.desal.2020.114567

Cited by 20 publications

(6 citation statements)

References 33 publications

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“…A significantly higher water flux (8.25 LMH) was observed after cleaning the membrane with the citric acid solution. Citric acid is an effective cleaning reagent that can remove phosphate salts and calcium carbonate from the surface of the membrane, as reported in other previous studies [52,53]; therefore, the flux deterioration observed in Fig. 7 was attributed primarily to inorganic scaling.…”

Section: Membrane Integrity and Cleaning Efficacysupporting

confidence: 73%

Pilot scale evaluation of thin film composite membranes for reducing wastewater volumes: osmotic concentration process

et al. 2023

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Gas operations generate large volumes of wastewater, necessitating efficient water management schemes. This study evaluates a forward osmosis (FO) pilot plant for volumes reduction of gas industry process water (PW). The osmotic pressure difference between seawater (40 g/L Total Dissolved Solids (TDS)) and low salinity (2 g/L TDS) PW is used for the osmotic concentration (OC). In the OC, PW volumes get reduced, while diluted draw solution (DS) is directly discharged, obviating the high-energy DS recovery step. A thin-film composite hollow fiber (HF) FO membrane was tested under FO mode using synthetic solutions to assess the performance on the OC unit. Subsequently, the pilot unit was subjected to PW feed for 48 h of continuous operation, primarily to evaluate water flux, reverse solute flux (RSF), and membrane fouling. The cleaning requirement to remove contaminants from the membrane surface was examined. The membrane achieved a water flux and RSF between 11.5 to 6.43 LMH and 38.57 to 9.45 mmol h−1 m−2, respectively at feed recovery rates between 60 and 90%. The membrane achieved a water flux of 10 LMH, which slightly decreased to 9.6 after 48 h of operation, mainly due to inorganic scaling. Lastly, cleaning with citric acid succeeded in recovering the initial water flux.

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Section: Membrane Integrity and Cleaning Efficacysupporting

confidence: 73%

Pilot scale evaluation of thin film composite membranes for reducing wastewater volumes: osmotic concentration process

et al. 2023

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“…Heavy metals can have a significant impact on membrane fouling by altering sludge properties or causing inorganic fouling [ 89 ]. Inorganic fouling by heavy metal compounds can be permanent, requiring cleaning with acids like citric acid [ 90 ]. Researchers have made various attempts to improve membrane selectivity by creating NF membranes with uniform pore diameters or modifying the charges on or in the selective layer or hydrophilicity, with some success in minimizing the fouling of membranes [ 91 ].…”

Section: Nf Membranes Characteristicsmentioning

confidence: 99%

Recent Advances in Membranes Used for Nanofiltration to Remove Heavy Metals from Wastewater: A Review

Covaliu-Mierlă,

Păunescu,

Iovu

2023

Membranes

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The presence of heavy metal ions in polluted wastewater represents a serious threat to human health, making proper disposal extremely important. The utilization of nanofiltration (NF) membranes has emerged as one of the most effective methods of heavy metal ion removal from wastewater due to their efficient operation, adaptable design, and affordability. NF membranes created from advanced materials are becoming increasingly popular due to their ability to depollute wastewater in a variety of circumstances. Tailoring the NF membrane’s properties to efficiently remove heavy metal ions from wastewater, interfacial polymerization, and grafting techniques, along with the addition of nano-fillers, have proven to be the most effective modification methods. This paper presents a review of the modification processes and NF membrane performances for the removal of heavy metals from wastewater, as well as the application of these membranes for heavy metal ion wastewater treatment. Very high treatment efficiencies, such as 99.90%, have been achieved using membranes composed of polyvinyl amine (PVAM) and glutaraldehyde (GA) for Cr3+ removal from wastewater. However, nanofiltration membranes have certain drawbacks, such as fouling of the NF membrane. Repeated cleaning of the membrane influences its lifetime.

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“…12 Scale-precursor ions that are prone to precipitation exist in most natural water sources. 13 Once the membrane encounters scaling, the dense scaling layer blocks the membrane pores and increases the additional mass transfer resistance. The scaling formation on the membrane surface often compromises energy consumption and the membrane lifespan.…”

Section: Introductionmentioning

confidence: 99%

“…Since numerous studies have investigated membrane fouling, the understanding of inorganic scaling still needs to be further deepened . Scale-precursor ions that are prone to precipitation exist in most natural water sources . Once the membrane encounters scaling, the dense scaling layer blocks the membrane pores and increases the additional mass transfer resistance.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated Reverse Osmosis Membrane with Simultaneous Mitigation of Silica Scaling and Organic Fouling

Zhan

Zhao

et al. 2023

Ind. Eng. Chem. Res.

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Inorganic scaling and organic fouling remain limiting factors for the further application of reverse osmosis (RO) membranes. Herein, a novel monomer, 2,2′-benzidinedisulfonic acid (BDSA), was selected as a comonomer with m-phenylenediamine (MPD) to fabricate RO membranes. Compared with the polyamide (PA) composite membrane, the as-prepared PA-BDSA composite membrane exhibited enhanced surface hydrophilicity and a smoother, more negative charge (zeta potential of −44.4 mV at pH 7). During the 24 h antiscaling experiment with a saturated silica solution (SiO2 concentration of 168 ppm), the water flux decline rate of the PA-BDSA-0.2 membrane was only 18%, which was 10% lower than that of the PA membrane (28%). During antifouling and scaling-fouling experiments, the PA-BDSA membranes also displayed less flux loss than the PA membrane, indicating its simultaneous alleviation of organic fouling and silica scaling. The analysis of the fouling layer revealed that compared to the PA membrane, fewer contaminants adhered to the PA-BDSA membrane surface. Furthermore, the interactions between silica and organic foulants were investigated, and the synergy of sodium alginate (SA) and silica aggravated fouling and scaling processes, resulting in a more serious flux decline rate. This research reveals a simple and practical method for the preparation of RO membranes to mitigate membrane scaling and fouling.

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Characterization and analysis of inorganic foulants in RO membranes for groundwater treatment

Cited by 20 publications

References 33 publications

Pilot scale evaluation of thin film composite membranes for reducing wastewater volumes: osmotic concentration process

Pilot scale evaluation of thin film composite membranes for reducing wastewater volumes: osmotic concentration process

Recent Advances in Membranes Used for Nanofiltration to Remove Heavy Metals from Wastewater: A Review

Sulfonated Reverse Osmosis Membrane with Simultaneous Mitigation of Silica Scaling and Organic Fouling

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