Optimizing seawater operating protocols for pressurized ultrafiltration based on advanced cleaning research

Oriol, Guillem Gilabert; Moosa, Nasir; García-Valls, Ricard; Busch, Markus; Garcı́a-Molina, Verónica

doi:10.1080/19443994.2012.714927

Cited by 8 publications

(9 citation statements)

References 5 publications

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“…These results show the same fouling trend observed in the literature by Gilabert Oriol. 4 Combining both researches it can be assessed that the TMP increases with a rate of 0.25 bar per day. Moreover, thanks to the CEB, the TMP is fully recovered to its initial value.…”

Section: Resultsmentioning

confidence: 99%

“…The hypothesis of this research is that a high efficiency operation of the ultrafiltration process can be achieved through further optimizing the backwash sequence. This is achieved combining the reduction of the backwash steps from five to two, 4 and the optimization of its frequency from 30 to 90 min. 13 This is achieved by assessing the total backwash time per day the membrane needs to be cleaned effectively.…”

Section: = × Efficiency Availability Recoverymentioning

confidence: 99%

“…This reduction from five steps (air scour, draining, backwash top with air scour, backwash bottom, and forward flush) to two steps (backwash top with air scour and forward flush) at a constant backwash frequency of 30 min increased the efficiency to 95%. 4 Simultaneously, previous investigations focused on reducing the backwash frequency in order to raise the ultrafiltration efficiency to 95%. The experiments were done keeping the 5 main backwash steps but reducing the backwash frequency from 30 to 90 min.…”

Section: Introductionmentioning

confidence: 99%

“…A second type of cleaning, which takes place with a lower frequency compared to the backwash is the chemically enhanced backwash (CEB). Often, the CEB occurs once or twice per day and is characterized by a longer duration compared to the backwash and also by the use of chemicals. − The last type of cleanings, the cleaning in place (CIP) occurs once every couple of months and is characterized by its longer duration (few hours typically) and higher chemical concentrations used compared to a CEB …”

Section: Introductionmentioning

confidence: 99%

“…Previous investigations have focused in reducing the number of backwash steps, so that the steps that contribute the less can be omitted. This reduction from five steps (air scour, draining, backwash top with air scour, backwash bottom, and forward flush) to two steps (backwash top with air scour and forward flush) at a constant backwash frequency of 30 min increased the efficiency to 95% …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High Efficiency Operation of Pressurized Ultrafiltration for Seawater Desalination Based on Advanced Cleaning Research

Oriol¹,

Hassan²,

Dewisme³

et al. 2013

Ind. Eng. Chem. Res.

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This paper discusses a method to operate polyvinylidene difluoride (PVDF) fibers based on outside-in pressurized ultrafiltration (pUF) membranes at high efficiency used as a pretreatment in seawater desalination. Backwash sequence was initially identified as the key contributor to the process efficiency yield. Backwash duration is reduced from 170 to 100 s, eliminating three redundant cleaning steps from an original sequence of five steps. Backwash frequency is decreased from once every 30 min to once every 90 min. These two optimizations result in an efficiency increase of 10% (from 88% to 97%). Thanks to this higher efficiency operation, it is possible to save 1.4 m 3 of ultrafiltrated water per day and filtering 96 extra minutes per day. A 14 days side by side validation is performed to validate the optimized conditions. In addition, the data is analyzed in order to prove that both backwashes have the same cleaning strength in reducing the trans-membrane pressure (TMP). A model to predict TMP evolution over time is presented and validated against the real plant performance during the validation period. This model is based on analyzing TMP increase during filtration cycle, TMP recovered during backwash cleaning and TMP recovered during chemical enhanced backwash (CEB).

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Section: Resultsmentioning

confidence: 99%

Section: = × Efficiency Availability Recoverymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%