Filtration

The management of residual sludge is an important subject. New environmental laws require the elimination of this waste by only two ways: incineration and agricultural use. In order to reach this goal, mechanical dewatering can be used as a first step due to its low energy cost. However, the final m

The filtration tests of electrolyte solutions performed with different ceramic membranes show that salt rejection depends on pH, salt nature and concentration. A simple correlation between streaming potential and rejection rates exits and confirms that streaming potential is a relevant parameter to

Two step coagulation using iron coagulant (FeCl3) with anionic polyelectrolyte in the first step and aluminum coagulant in the second one was made to reduce the negative effect of the fouling phenomenon. The process was operated on the commercial scale. The raw water was the blowdown water from the

The streaming potential measured through the wall of a charged ceramic UF membrane is a relevant parameter to predict the retention properties of the considered membrane for ionic solutions. It is more satisfying than the electrophoretic measurement of the material particles used to prepare the memb

Thin-layer molecularly imprinted polymer (MIP) composite membranes for selective binding of triazine herbicide desmetryn from aqueous solutions were developed using photoinitiated copolymerization of 2-acrylamido-2-methyl1-propane sulphonic acid and N,N′-methylene-bis-acrylamide in the presence of t

This paper discusses the aeration aspect of an ultrafiltration application involving immersed membranes creating an airlift pattern. The continuous aeration commonly used with immersed membranes to mitigate the effects of fouling was compared with several new aeration configurations. These new aerat

In this paper, a predictive model for hemodialysis/hemodiafiltration is used to design for the treatment of uremic patients membrane modules more efficient than commercial hemodialysers. Fractionation of the available membrane area into modules alternatively operated in internal and back filtration

Ultrafiltration is an ideal pretreatment method for reverse osmosis because it allows removing suspended solids and colloidal materials completely and reliably without chemicals. This paper introduces the ZeeWeed 1000 immersed membrane and its application for seawater ultrafiltration. ZeeWeed 1000

To prevent reverse osmosis (RO) membrane fouling, all the organic, colloidal and biological matter needs to be removed from the feed water to the RO system. A proper pretreatment is therefore considered to be the key to successful RO plant operation. A key component of the RO pretreatment process is