S. Assiyeh Alizadeh Tabatabai's Coagulation and Ultrafiltration in Seawater Reverse Osmosis PDF

By S. Assiyeh Alizadeh Tabatabai

This learn investigates the position of coagulation in bettering hydraulic functionality and permeate caliber of UF membranes and gives perception into techniques for minimizing or preferably disposing of coagulation from UF pre-treatment to SWRO. effects convey that coagulation improves UF hydraulic functionality quite often by way of lowering non-backwashable fouling of the membranes. this is often completed at very low coagulant dose (~ 1/2 mg Fe/L) through coating the membranes with sub-micron particles.
Additionally, the paintings highlights the applicability of UF membranes with low molecular weight cut-off because the coagulant unfastened way forward for SWRO pre-treatment. significant advantages when it comes to decreased environmental effect is anticipated while employing membranes with low molecular weight cut-off, because the want for coagulation is eradicated whereas making sure toughness of downstream SWRO membranes. typically phrases, the examine exhibits that coagulant intake may be considerably diminished in UF pre-treatment of SWRO by way of optimizing operational parameters and using substitute solutions.

Show description

Read or Download Coagulation and Ultrafiltration in Seawater Reverse Osmosis Pretreatment PDF

Similar water quality & treatment books

Read e-book online Rainfed Farming Systems PDF

Whereas agriculturists desire a solid grab of the various separate elements of agriculture, it really is crucial that in addition they comprehend the functioning of farming structures as an entire and the way they are often most sensible controlled. This ebook takes this sort of mixed procedure. It analyses universal rainfed farming structures around the globe and discusses either their strengths and methods of enhancing their operation and administration for long-term productiveness, profitability and sustainability.

Download e-book for kindle: Environmental Hydraulics and Sustainable Water Management, by J.H.W. Lee, K.M. Lam

This two-volume set, with cd-rom, includes the lawsuits of the 4th overseas Symposium on Environmental Hydraulics & the 14th Congress of Asia and Pacific department, foreign organization of Hydraulic Engineering and examine held in December 2004 in Hong Kong. quantity 1 covers the chosen papers offered on the 4th foreign Symposium, whereas Volume 2 good points the advances defined in papers from the 14th IAHR-APD Congress.

Advances in Membrane Technologies for Water Treatment: - download pdf or read online

Advances in Membrane applied sciences for Water remedy: fabrics, approaches and purposes offers a close review of complex water therapy equipment regarding membranes, that are more and more noticeable as powerful replacements for a number of traditional water therapy tools. The textual content starts with reports of novel membrane fabrics and advances in membrane operations, then examines the procedures concerned with enhancing membrane functionality.

Download e-book for iPad: Focus first on service : the voice and face of your utility by American Water Works Association

This guide serves as either a strategic education adventure and a device for reaching caliber customer support at your water application. subject matters lined contain conversation ideas, computerized applied sciences, grievance solution, coping with clash, and extra. it really is informative and simple to appreciate layout let for speedy effects.

Extra resources for Coagulation and Ultrafiltration in Seawater Reverse Osmosis Pretreatment

Sample text

Media filtration (including coagulation) has limited capacity in handling poor water quality and variations in quality. This is also true for extended pretreatment schemes including coagulation, flocculation and sedimentation prior to media filtration. One of the most challenging operational regimes for SWRO pretreatment is during periods of algal bloom where relatively high concentrations of algal cells and algal organic matter (AOM) are present in seawater. , GMF in combination with coagulation) cannot handle severe algal bloom events, highlighting the need for more robust pretreatment technology.

3 Biological fouling Bacteria has been shown to adhere, accumulate and multiply in RO systems which eventually result in the formation of a slimy layer of dense concentrations of bacteria and their extracellular polymeric substances known as biofilm. When the accumulation of biofilm reaches a certain threshold that operational problems are encountered in the membrane system, it is considered as biological fouling or biofouling (Flemming, 2002). , > 15%) decrease of normalised membrane flux, increase in net driving pressure 27 28 Coagulation and ultrafiltration in seawater reverse osmosis pretreatment and/or increase in feed channel pressure drop.

Meanwhile, Liberman and Berman (2006) proposed a set of tests to determine the microbial support capacity (MSC) of water samples, namely chlorophyll-a, TEP, bacterial activity, total bacterial count, inverted microscope observations of sedimented water samples, biological oxygen demand (BOD), total phosphorous and total nitrogen. More investigations are needed to assess the reliability of these parameters/monitors to predict the biofouling potential of algal bloom impaired seawater. 5 Proposed strategies to control algae and AOM fouling Reverse osmosis plants operating with direct/open source intake require extensive pretreatment of the raw water to maintain or prolong reliable performance and membrane life.

Download PDF sample

Rated 4.28 of 5 – based on 4 votes