Distribution, mobility and toxicity of metals in natural waters are strongly related to their aqueous speciation. To understand the behaviour of an aqueous element and the transformation between chemical species, there is a need for reliable methods that enable measurements of specifi c fractions of metals. Ultrafi ltration has frequently been used to study speciation of metals in natural water...

overhydrated patients. This made it possible to relieve the uraemic patient from congestive heart failure and to control arterial blood pressure. Ultrafi ltration is generally applied continuously or intermittently, while the dialysis procedure (diffusion of substances across the dialysis membrane) is going on. During the last few years, short-time dialysis (3–4 hr 3 times a week or every other...

This study aims to investigate the potential of nanoparticle retention of ultrafi ltration (UF) multichannel hollow fiber membrane. Filtration experiments of fl uorescent silica nanoparticles (NPs) (10 and 100 nm) and CdTe quantum dots (1.5 nm) suspensions were carried out under diff erent operating conditions to analyze the retention rate (RT), the fouling zone and the...

the main objective of this study was to investigate the effi ciency of biological treatmentof azo dye-containing wastewater with a sequencing batch reactor system, followed by ultrafi ltration.the performance of the system was quantifi ed by measuring the chemical oxygen demand and azo dyeconcentration. the biodegradation was carried out under combined alternating anaerobic and aerobiccondition...

Seawater ultrafi ltration (UF) as a pretreatment of reverse osmosis (RO) process in a thermal power plant was investigated using a 100 kDa hollow fi ber membrane. The choice of the UF physical backwash conditions remains arbitrary or ensuing from a sensibility study. As the optimum must take into account the factors interactions, we led a response surface study to analy...

Long time uptake arsenic will cause cancers and blackfoot disease. There are still several million people suffering from drinking arsenic ontaminated water. This work studied the performance of coupled chitosan/UF for arsenic removal and the influence of dissolved organic matter n arsenic removal with UF operation. Humic acid representing dissolved organic matter was fractionated into five grou...

Moreover, a wide variation in the course of relative blood volume during dialysis was previously described by Krepel et al. [5] . In this paper, no statistical relationship could be found between changes in relative blood volume and either inferior caval vein diameter (ICVD) or blood pressure, indicating that the initiation of hypotension may result from defective cardiovascular defense mechani...

Single-use/disposable technology (SU/DT) has emerged over the past decade as a cost-effective and fl exible basis for biopharmaceutical manufacturing (1,2). It has moved beyond the limited applications of culture bags, liquid storage bags, and sampling devices, and now includes more unit-operation-based capabilities, such as cartridge fi ltration, depth fi ltration, ultrafi ltration, and chroma...

Chlorophenols are widely used in various industries, including as preservatives in wood manufacturing, in paper industry, in chemical synthesis, and in biodegradation of herbicide and pesticide [1]. These applications lead to considerable level of contamination in wastewater and ground water [2]. Chlorophenols are highly toxic, poorly biodegradable, and present serious health concerns to human ...

This paper is devoted to the application of new low cost ceramic ultrafi ltration membranes material coming from the Tunisian ores (mud) which is usually considered as disastrous for the environment. A ceramic tubular support previously elaborated from mud was coated in the lumen side by slip casting method. After sintering at 650°C, the coated membrane shows homogeneou...