The performance and membrane fouling rate of a pilot-scale anaerobic membrane bioreactor for treating antibiotic solvent wastewater under different cross flow velocity

A pilot-scale study of membrane bioreactor treatment for reclamation of wastewater from Berendsen Textile Service industrial laundry in Søborg, Denmark was carried out over a 4 month period. A satisfactory COD degradation was performed resulting in a low COD in the permeate (<50 mg/l). To obtain satisfactory treatment, addition of nitrogen was necessary. The biodegradability of the permeate was very low (BOD5<2 mg/l). A hydraulic retention time of 1 d turned out to be sufficient at a sludge concentration of 10 g MLSS/l. Through addition of a cationic polymer, a satisfactory dewaterability of the sludge was reached. Membrane tests showed that operating at a trans-membrane pressure of 3 bar and a cross-flow velocity of 4 m/s, a flux of 120 l/m2h can be expected without using chemicals for membrane cleaning. The quality of the permeate was very good when comparing to the reuse quality demands of water to the wash processes. Reuse of the permeate in all rinsing steps requires additional treatment through reverse osmosis.

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Impact of osmotic backwashing, particle size distribution and feed-side cross-flow velocity on flux in the forward osmosis membrane bioreactor (FO-MBR)

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2019.100861 ◽

2019 ◽

Vol 31 ◽

pp. 100861 ◽

Cited By ~ 6

Author(s):

Muhammad Saqib Nawaz ◽

Fozia Parveen ◽

Sher Jamal Khan ◽

Nicholas P. Hankins

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Flow Velocity ◽

Size Distribution ◽

Membrane Bioreactor ◽

Forward Osmosis ◽

Cross Flow ◽

Cross Flow Velocity

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DETERMINATION OF FOULING MECHANISM IN ULTRAFILTRATION OF ELECTROPLATING WASTEWATER

Jurnal Teknologi ◽

10.11113/jt.v80.12739 ◽

2018 ◽

Vol 80 (3-2) ◽

Author(s):

Danu Ariono ◽

Anita Kusuma Wardani ◽

Putu Teta Prihartini Aryanti ◽

Ahmad Nurul Hakim ◽

I Gede Wenten

Keyword(s):

Flow Velocity ◽

Membrane Fouling ◽

Membrane Surface ◽

Cross Flow ◽

Permeate Flux ◽

High Concentration ◽

Filtration Time ◽

Electroplating Wastewater ◽

Fouling Mechanism ◽

Cross Flow Velocity

Wastewater from electroplating industries is usually contaminated with high concentration of hazardous materials, such as nickel, copper, and chromium. Therefore, the electroplating wastewater is one of the environmental problems that require a novel solution to reduce risks for human and environment. Ultrafiltration is a promising technology to overcome this problem due to its ability to reject all suspended solids. However, membrane fouling still becomes a major obstacle in ultrafiltration processes. Fouling reduces the permeate flux and increases membrane operational costs due to membrane cleaning. In this work, fouling mechanism that occurred in polyacrylonitrile based ultrafiltration for electroplating wastewater treatment was investigated. The effects of trans-membrane pressure (TMP) and cross flow velocity on fouling mechanism were also studied. The results showed that in the first 20 minutes, intermediate blocking was occurred on the membrane surface, while cake formation was happened for the rest of filtration time. These results were applied for all TMP and cross flow velocity.

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Membrane Fouling Monitoring in a Submerged Membrane Bioreactor

Proceedings ◽

10.3390/proceedings2110653 ◽

2018 ◽

Vol 2 (11) ◽

pp. 653

Author(s):

Konstantinos Azis ◽

Marianthi Malioka ◽

Spyridon Ntougias ◽

Paraschos Melidis

Keyword(s):

Membrane Fouling ◽

Membrane Bioreactor ◽

Municipal Wastewater ◽

Membrane Surface ◽

Cross Flow ◽

Pilot Scale ◽

Municipal Wastewater Treatment ◽

Membrane Performance ◽

Conventional Activated Sludge ◽

Major Disadvantage

Use of Membrane Bioreactor (MBR) technology for municipal wastewater treatment has been increased in recent years, as it successfully overcomes the disadvantages of the conventional activated sludge process. Membrane fouling is the major disadvantage of MBRs and leads to decreased membrane performance and expanded operational expenses. In this study, fouling was monitored in a pilot-scale submerged MBR system fed with municipal wastewater. TMP was directly measured on the membrane module during the operation. To control TMP increase owing to biosolids accumulation on membrane surface, successive backwashes and air-cross flow velocity increase were applied. These measures lowered TMP and improved flux.

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Forward osmosis membrane fouling and cleaning for wastewater reuse

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2016.023 ◽

2016 ◽

Vol 7 (2) ◽

pp. 111-120 ◽

Cited By ~ 17

Author(s):

Youngbeom Yu ◽

Seockheon Lee ◽

Sung Kyu Maeng

Keyword(s):

Activated Sludge ◽

Flow Velocity ◽

Membrane Fouling ◽

Suspended Solids ◽

Wastewater Reuse ◽

Forward Osmosis ◽

Cross Flow ◽

Short Period ◽

Cross Flow Velocity ◽

Cleaning Methods

Membrane fouling properties and different physical cleaning methods for forward osmosis (FO) and reverse osmosis (RO) laboratory-scale filtration systems were investigated. The membrane fouling, with respect to flux reduction, was lower in FO than in RO when testing an activated sludge effluent. Cross-flow velocity, air-scouring, osmotic backwashing and effect of a spacer were compared to determine the most effective cleaning method for FO. After a long period of fouling with activated sludge, the flux was fully recovered in a short period of osmotic backwashing compared with cleaning by changing cross-flow velocity and air-scouring. In this study, the osmotic backwashing was found to be the most efficient way to clean the FO membrane. The amount of RNA recovered from FO membranes was about twice that for RO membranes; biofouling could be more significant in FO than in RO. However, the membrane fouling in FO was lower than that in RO. The spacer increased the flux in FO with activated sludge liquor suspended solids of 2,500 mg/L, and there were effects of spacer on performance of FO–MBR membrane fouling. However, further studies are required to determine how the spacer geometry influences on the performance of the FO membrane.

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