scholarly journals Reversible and irreversible membrane fouling in hollow-fiber UF membranes filtering surface water: effects of ozone/powdered activated carbon treatment

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10323-10335
Author(s):  
Weiwei Huang ◽  
Yuanhong Zhu ◽  
Lin Wang ◽  
Weiguang Lv ◽  
Bingzhi Dong ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Water ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Powdered Activated Carbon ◽  
Polluted Water ◽  
Water Effects ◽  
Uf Membranes ◽  
Carbon Treatment

This study investigated the reversible and irreversible membrane fouling behavior of micro polluted water by ozone/powdered activated carbon (PAC)/ultrafiltration treatment.

scholarly journals Powdered Activated Carbon Exacerbates Fouling in MBR Treating Olive Mill Wastewater

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2498 ◽  
Author(s):  
Noya Ran ◽  
Jack Gilron ◽  
Revital Sharon-Gojman ◽  
Moshe Herzberg
Keyword(s):  
Activated Carbon ◽  
Membrane Permeability ◽  
Membrane Fouling ◽  
Biofilm Formation ◽  
Laser Scanning ◽  
Powdered Activated Carbon ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Permeate Flux ◽  
Wastewater Treatment Process

Membrane fouling is a major obstacle in membrane bioreactors (MBRs) that treat wastewater. The addition of powdered activated carbon (PAC) is commonly suggested as a way to improve the MBR wastewater treatment process with respect to membrane fouling and effluent quality. Integrating the PAC addition into the MBR may also improve the stability of the acclimated microbial community for biodegrading the recalcitrant organic compounds that can also enhance membrane fouling. In this study, the ability of the MBR-PAC system to decrease membrane fouling was evaluated. Two pilot-scale reactors were operated: one reactor was supplemented with suspended PAC, and one was operated under similar conditions, without PAC. The feed to the reactors comprised domestic and olive oil mill wastewater. Surprisingly, the permeate flux and the membrane permeability decreased faster in the MBR supplemented with PAC compared to the control reactor. Corroborating these MBR fouling results, soluble microbial products (SMPs), originating from the PAC-supplemented reactor, were found to be more adhesive to an ultrafiltration membrane mimetic surface (polyether sulfone) as analyzed in a quartz crystal microbalance with dissipation monitoring (QCM-D). While the PAC had almost no effect on the dissolved organic carbon in the MBR, it altered the molecular weight distribution of the organic molecules in the SMP as observed with gel permeation chromatography: The fractions of 577–789 kDa and the one bigger than 4 × 103 kDa, were elevated and reduced, respectively, by the addition of PAC. A biofilm formation analysis using a confocal laser scanning microscopy showed a higher amount of biofilm on the membrane taken from the PAC reactor, but this membrane showed no traces of PAC particles when analyzed with a scanning electron microscope (SEM). Taken together, altering the composition of the dissolved organic matter in the MBR by PAC addition promoted its adhesion to the membrane, induced biofilm formation, and more prominently, decreased membrane permeability.

Coagulation-adsorption-ultrafiltration for wastewater treatment and reuse

2003 ◽  
Vol 3 (5-6) ◽  
pp. 361-365 ◽  
Author(s):  
D. Abdessemed ◽  
G. Nezzal ◽  
R. Ben Aim
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Domestic Wastewater ◽  
Powdered Activated Carbon ◽  
Cod Removal ◽  
Wastewater Reclamation ◽  
Wastewater Reclamation And Reuse ◽  
Pre Treatment ◽  
Uf Membranes ◽  
Tubular Membranes

We considered the treatment of domestic wastewater by coagulation–adsorption–ultrafiltration, and a test of adsorption like pre-treatment to the membrane as an alternative for wastewater reclamation and reuse. The performances of two inorganic tubular membranes (M2 and M5 CARBOSEP with 15,000 Da and 10,000 Da MWCO) were studied. Powdered activated carbon was used as adsorbent agent and FeCl3 as a coagulant. Coupling adsorption and ultrafiltration resulted in satisfactory results: the efficiency of COD removal was increased by using PAC compared with results obtained when using only UF membranes.

scholarly journals The removal of typical pollutants in secondary effluent by the combined process of powdered activated carbon–ultrafiltration

2017 ◽  
Vol 75 (6) ◽  
pp. 1485-1493 ◽  
Author(s):  
Lihua Sun ◽  
Ning He ◽  
Tianmin Yu ◽  
Xi Duan ◽  
Cuimin Feng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Membrane Fouling ◽  
Filter Cake ◽  
Powdered Activated Carbon ◽  
Secondary Effluent ◽  
Moderate Amount ◽  
Combined Process ◽  
Membrane Flux ◽  
Initial Stage ◽  
Cake Layer

This paper focused on the effects of powdered activated carbon (PAC) dosage on ultrafiltration (UF) membrane flux caused by natural organic matter (NOM). Three model foulants, humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA), were adopted to represent different NOM fractions in secondary effluent treated by the combined process of PAC-UF. Moreover, the membrane fouling resistance and fouling mechanism were also analyzed. The results indicated that the best PAC dosage for the membrane flux variation was 20 mg/L for HA and SA, and 10 mg/L for BSA. SA caused the most serious membrane fouling, which was mainly reversible fouling. The membrane fouling caused by HA and BSA was mainly irreversible membrane fouling. The membrane fouling caused by organics happened mainly at the initial stage of filtration. Because the filter cake layer formed by a moderate amount of PAC could intercept organics, the membrane fouling, especially the irreversible fouling, could be reduced.

scholarly journals Combination of Coagulation, Adsorption, and Ultrafiltration Processes for Organic Matter Removal from Peat Water

2021 ◽  
Vol 14 (1) ◽  
pp. 370
Author(s):  
Muthia Elma ◽  
Amalia Enggar Pratiwi ◽  
Aulia Rahma ◽  
Erdina Lulu Atika Rampun ◽  
Mahmud Mahmud ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Aluminum Sulfate ◽  
Adsorption Process ◽  
Powdered Activated Carbon ◽  
Organic Matter Removal ◽  
Water Borne

The high content of natural organic matter (NOM) is one of the challenging characteristics of peat water. It is also highly contaminated and contributes to some water-borne diseases. Before being used for potable purposes, peat water must undergo a series of treatments, particularly for NOM removal. This study investigated the effect of coagulation using aluminum sulfate coagulant and adsorption using powdered activated carbon (PAC) as a pretreatment of ultrafiltration (UF) for removal of NOM from actual peat water. After preparation and characterization of polysulfone (Psf)-based membrane, the system’s performance was evaluated using actual peat water, particularly on NOM removal and the UF performances. The coagulation and adsorption tests were done under variable dosings. Results show that pretreatment through coagulation–adsorption successfully removed most of the NOM. As such, the UF fouling propensity of the pretreated peat water was substantially lowered. The optimum aluminum sulfate dosing of 175 mg/L as the first pretreatment stage removed up to 75–78% NOM. Further treatment using the PAC-based adsorption process further increased 92–96% NOM removals at an optimum PAC dosing of 120 mg/L. The final UF-PSf treatment reached NOM removals of 95% with high filtration fluxes of up to 92.4 L/(m2.h). The combination of three treatment stages showed enhanced UF performance thanks to partial pre-removal of NOM that otherwise might cause severe membrane fouling.

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