Home > Research Paper Tags > Membrane cleaning
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In situ measurement of particle deposition and its removal in microfiltration by ultrasonic time-domain reflectometry
... was used for the non-invasive, in situ visualization of particle deposition and its removal during crossflow microfiltration with a nylon membrane. The study was carried out with 0.5 g/l kaolin (average particle size 2 µm). Ultrasonic response signals were obtained upon particle deposition... UTDR technique was also used to quantify the thickness of a fouling layer on the membrane surface. Moreover, UTDR was applied to monitor membrane cleaning and evaluate the effectiveness of various cleaning methods. Flux measurements and SEM analyses corroborated the UTDR results. Overall, the result ...
Desalination 146 (2002)
... remove colloidal and dissolved silica, which can be found in high concentrations in brackish water. The presence of silica and its ability to foul membranes limits the use of silica bearing waters for desalination and when used, it has many economic penalties. This study examines the effect of silica... were carried out to examine the actual fouling mechanism in reverse osmosis units under various experimental conditions. Furthermore the effect of cleaning, with distilled water and with pulsations as well as with commercially available cleaners were examined. Some commercially available cleaners wer ...
Desalination 139 (2001)
Study on the cleaning of new ultrafiltration spiral-wound modules to prevent membrane fouling (including biological fouling)
... study of cleaning a Bulgarian UF 60 PAN spiral-wound module was carried out on an ultrafiltration unit (Millipore, USA). Chemical cleaning of the membrane with a 0.25% solution of sodium metabisulfite did not prevent biological fouling. When treated with a 1% solution of formaldehyde, membrane ...
Desalination 172 (2005)
M odified and unmodified membrane samples w ere taken from different pilot-scale membrane plants after a sufficient operation period. One of t he plants is installed at a municipal drinking water t reatment plant, the second, a MBR, is... and precise m ethod for the characterisation of foulants in regard to their molecular weights. Furthermore, it enables the analysis of the cleaning potential of several chemical solutions. While water has the l owest cleaning potential, in this study NaOH is t he most promising cleaning ...
Desalination 178 (2005)
A novel stainless steel membrane module with a 0.2 µm nominal pore diameter was applied in an aerated submerged membrane bioreactor to treat synthetic domestic sewage. The pore size of metal membrane was more homogeneous and of tighter distribution than that of... alleviated by the on-line backwash and intermittent running mode. In addition, membrane fouling could be eliminated almost entirely by off-line cleaning with 0.25% (wt) NaClO solution with pH 12. After off-line cleaning, membrane flux could be recovered by about 93.3%. These results implied that i ...
Desalination 177 (2005)
The alternate temperature-change cleaning behaviors of PNIPAAm grafted porous polyethylene membrane fouled by proteins
... of Poly(N-isopropylacrylamide) (PNIPAAm) around LCST, a simple temperature-change cleaning method for PNIPAAm grafted porous polyethylene membrane fouled by bovine serum albumin (BSA) was proposed. It was found that after the temperature-change cleaning program between 25 and 35 C, th ...
Desalination 234 (2008)
Fouling remains a signiﬁcant challenge in the application of membrane distillation process to the desalination industry. This study was focused on the characterizations of fouling layer on the membrane of a membrane... controlled by the chemical conditioning of the feed using sodium hypochlorite (NaOCl). The combination of NaOCl-added conditioning and membrane cleaning with 3% HCl restored the permeate ﬂux up to 70–85% and stabilized the electrical conductivity of the distillate for extended time. © 201 ...
Desalination 367 (2015)
... Membrane distillation (MD) has become an area of rapidly increasing research and development since the 1990s, providing a potentially cost effective... types of fouling, mechanisms of fouling, fouling differences by sources of water, system design, effects of operating parameters, prevention, cleaning, membrane damage, and future trends. Finally, numerical modeling of the heat and mass transfer processes has been used to calculate the saturatio ...
Desalination 356 (2015)
Scale reduction and cleaning techniques during direct contact membrane distillation of seawater reverse osmosis brine
... • Antiscalant prolongs DCMD operational time by mitigating salts precipitation. • SWRO brine and distillate ﬂushings are effective in membrane cleaning. (1) A bench scale DCMD test achieved 60% water recovery to treat SWRO brine of 68 g/L TDS. It was found that distillate ﬂux reductio ...
Desalination 374 (2015)
A pilot plant scale hollow fiber membrane system was developed for the removal of dissolved oxygen from boiler feed water via vacuum degassing process. Feed water was introduced to the... the combination of aluminum silicate. Mass transfer resistances of the fouled membrane were also theoretically calculated. Finally, two membrane cleaning methods were investigated and the air backwash method was found to be effective to clean the fouled membrane and was recommended as the regula ...
Desalination 234 (2008)