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Membrane fouling

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In this study, a mathematical model has been developed for the submerged membrane bioreactor (SMBR) combining the activated sludge model No.1 (ASM1) with a membrane fouling model. The ASM1 was modified to take account int ...
Desalination 146 (2002)

... 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... formation on the membrane surface. A cake layer echo appeared in the time domain. The 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.
Desalination 146 (2002)

A membrane bioreactor used for denitrification of a synthetic substrate was studied in term of membrane fouling. For standard pH and temperature conditions, subcritical conditions were defined to ensure the process stability. The stepwise method wa ...
Desalination 146 (2002)

Computer, thus allowing UF module performance monitoring. It is, therefore, possible to continuously measure permeate flux decay and to control membrane fouling by means of a device, controlled by the PC, that is able to generate pulses on both trans-membrane pressure and feed flow rate. Thi ...
Desalination 146 (2002)

Manganese (Mn) removal is one of the many problems of using ground water since Mn is a common element in ground water. Mn cannot be removed by membrane filtration without being oxidized to manganese dioxide. To find an applicable and clean oxidation method, advanced oxidize processes (AOPs) and Mn... and contact time. As a result of comparing continuous filtration, the Mn sand not only removed over 95% of Mn(II), but also decreased the membrane fouling, and prolonged the operational life of the membrane. While comparing this study with previous works, several important conclusions can be obtained ...
Desalination 139 (2001)

... waters are usually grouped under two types: brackish (1000–15000 mg/l) and seawater (>15,000 mg/l) as based on their total salinity. Only two RO membrane types are commercially available (i.e., BWRO and SWRO), which are currently used for all waters regardless of the wide variation in their chemical... design and membrane selection are also provided in detail. Keywords: Water classification; Water type; RO system design; Molar ratio; Membrane fouling *Corresponding author. Presented at the European Conference on Desalination and the Environment: Water Shortage. Lemesos, Cyprus, 28–31 May 2001.
Desalination 139 (2001)

... of lime, soda ash, and sodium aluminate in field tests have been investigated. Keywords: Silica fouling; RO fouling; Reverse osmosis; Desalination; Membrane fouling; Water treatment 1. Introduction and objectives Silica is the most abundant material on the earth’s surface and is a major and a ver ...
Desalination 139 (2001)

... 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... plant. Concentration polarisation (C/P) in the system was experimentally determined with a simple technique that was developed and its effects on fouling are examined. In addition tests were carried out to examine the actual fouling mechanism in reverse osmosis units under various experimenta ...
Desalination 139 (2001)

The results of microfiltration studies using inorganic TiO2/Al2O3 membranes for solutions containing yeast are reported. The aim of the research was experimental as well as mathematical analysis of the permeate flux... the frame of mathematical equation obtained using semiempirical models of the filtration and steady-state fluxes. Concentration polarization and fouling phenomena in microfiltration of yeast suspension using ceramic 0.8 mm membrane can be Table 3 The data for calculation of JNET TMP (Pa) 1.15)/10 ...
Desalination 240 (2009)

This paper presents a review of some of the key methods of generating flow instabilities that have been implemented in membrane separation processes by various workers during the past few years (mainly the 1990s). The types and effects of incorporating these techniques are... techniques and cyclic feed operation. There is a substantial amount of data in the reviewed literature in support of improved performance and fouling prevention in the presence of flow instabilities. Several novel techniques of generating fluid instabilities for membrane processes have bee ...
Desalination 136 (2001)

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