Integrated multi-objective membrane systems for surface water treatment: pretreatment of reverse osmosis by conventional treatment and ultrafiltration

Treatment of the surface water of the city of Khenifra combines a conventional treatment and a membrane process unit (reverse osmosis). The conventional treatment in question uses an aluminium base reagentin the form of Aluminum sulphate that may cause leaks of Aluminum called "residual Aluminum" in the filtered water. The objective of this work is to study the elimination of residual aluminum, resulting from the conventional treatment, for a better operation of the demineralization unit by Reverse Osmosis, located downstream. Indeed, according to the requirements of the supplier of the membranes, the residual aluminum content should not exceed 0.05mg/L. The jar test remains the most used test, at the level of the laboratories, which allows optimizing the doses of treatment reagents to be used in a treatment plant; particularly the aluminum sulfate coagulant. Trials of the jar test were performed and had been optimized by the application of Doehlert experimental design.The effectiveness of the treatment and the optimum conditions through the stages of treatment are achieved by monitoring the parameters: pH, turbidity and residual aluminum.

Download Full-text

COMPARATIVE STUDY ON SURFACE WATER TREATMENT USING ALUMINIUM SULPHATE AND POLYALUMINIUM CHLORIDES AS COAGULANT REAGENTS

Environmental Engineering and Management Journal ◽

10.30638/eemj.2009.122 ◽

2009 ◽

Vol 8 (4) ◽

pp. 859-863 ◽

Cited By ~ 2

Author(s):

Daniela Simina Stefan ◽

Cristina Costache ◽

Viorica Ruxandu ◽

Monica Balas ◽

Mircea Stefan

Keyword(s):

Water Treatment ◽

Surface Water ◽

Comparative Study ◽

Aluminium Sulphate ◽

Surface Water Treatment

Download Full-text

A rapid small scale evaluation of ultrafiltration performance for surface water treatment at Alcantarilha's water treatment works (Algarve, Portugal)

Water Science & Technology Water Supply ◽

10.2166/ws.2004.0109 ◽

2004 ◽

Vol 4 (5-6) ◽

pp. 199-206

Author(s):

M. Ribau Teixeira ◽

H. Lucas ◽

M.J. Rosa

Keyword(s):

Water Treatment ◽

Membrane Fouling ◽

Conventional Treatment ◽

Apparent Molecular Weight ◽

Small Scale ◽

Hydraulic Permeability ◽

Scale Evaluation ◽

Surface Water Treatment ◽

Drinking Water Production ◽

Pre Treatment

A rapid small-scale evaluation of ultrafiltration (UF) performance with and without physical–chemical pre-treatment was performed to up-grade the conventional treatment used for drinking water production in Alcantarilha's water treatment works, Algarve, Portugal. Direct UF and pre-ozonation/coagulation/flocculation/sedimentation/UF (O/C/F/S/UF) were evaluated using polysulphone membranes of different apparent molecular weight cut-off (MWCO) (15–47 kDa). The results indicated that (i) UF is an effective barrier against microorganisms, including virus larger than 80 nm; (ii) for surface waters with low to moderate SUVA values, direct UF performance is equivalent or better than the conventional treatment in terms of residual turbidity, while UV254 nm and TOC residuals require the use of O/C/F/S/UF; (iii) the permeate quality improves with the membrane apparent MWCO decrease, especially for the direct UF, although the conventional treatment performance is never reached using UF; (iv) membrane fouling and adsorption phenomena are more severe in direct UF than in O/C/F/S/UF sequence (pre-ozonation decreases the membrane foulants by decreasing their hydrophobicity) and these phenomena increase with the membrane hydraulic permeability and, particularly, with the membrane apparent MWCO.

Download Full-text