Biofouling, Antiscalant


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New distributors and EU compliance for PWT

Membrane chemicals supplier Professional Water Technologies (PWT), the US arm of Canada's H2O Innovation, recently signed agreements with two new distributors in Brazil and Argentina, increasing its presence in South America.

A sustainable antiscalant for RO processes

One of the common complaints leveled at the desalination industry by environmentalists is discharges of brine from plants contain additional amounts of chemicals required to reduce scaling and biofouling. Carboxymethyl inulin (CMI) is an environmentally friendly antiscalant which has proven to be cost-effective in RO processes and therefore could have a positive contribution to addressing this concern. This article first appeared in the February/March 2011 issue of Desalination & Water Reuse magazine.

TEP expert dies in Galapagos fall

Professor Tom Berman, best known in the desalination world for his work on transparent exopolymer particles (TEPs), died last week after a fall during a vacation in the Galapagos Islands.

Berman joins D&WR/IDA online symposium team

Tom Berman, research professor emeritus of the Kinneret Limnological Laboratory, Israel, who is a leading expert on biofouling and transparent exopolymer particles (TEP) in reverse osmosis, has been added to the speakers for the International Online Symposium on Pretreatment for Seawater Reverse-Osmosis Desalination.

Live Webinar Masterclass - Membrane Fouling Control

The first in a series of Desalination and Water Reuse Masterclass webinars will run on 12 February this year. Each event will offer practical, readily applicable guidance delivered by an expert in the topic covered.

Researchers share industry prize for fouling research

Doctoral students, Ariel Atkinson of the University of North Carolina at Chapel Hill and Erin Partlan of Clemson University, have received the 2014 Fellowship for Membrane Technology award from the American Membrane Technology Association (AMTA) and the National Water Research Institute (NWRI) for research in membrane fouling.

North Sea gas RO package supplied by UK company

A containerised reverse‑osmosis (RO) desalination package is to be supplied for an unmanned gas platform in the North Sea by Salt Separation Services of Rochdale, UK.

AWC in full production at new Tampa factory

American Water Chemicals (AWC) has resumed full production of its membrane water treatment chemicals following its recent move into a new 41,000 ft² (3,800 m²) building.

PWT signs three new overseas distributors

Three new distributors in Malaysia, Singapore and South Africa have been signed up by Professional Water Technologies (PWT), the business unit of Canada's H2O Innovation Inc.

PWT to be represented by Omya in EMEA region

Professional Water Technologies announced on 6 September 2011 that it had signed a sales representative agreement with Omya International AG, a leading global producer of industrial minerals, and a worldwide distributor of chemical products.

BWA changes hands once more

Desalination and water treatment chemical specialist BWA Water Additives has been sold for the second time in three years for around £ 185 million (US$ 300 million).

S Australia government questions Billiton desalination EIS

Desalination discharge led the list of concerns raised by the South Australia government in its submission on 24 April 2009 to BHP Billiton's environmental impact statement (EIS) related to its proposed expansion of its Olympic Dam mining operations.

The reverse osmosis pilot plant at Ras Abu Jarjur

Experience helps boost production and stability at Ras Abu Jarjur

Improving production with reduced expenditure could be the main targets of any desalination facility around the world. Such feats are being methodically achieved at Ras Abu Jarjur reverse-osmosis (RO) plant in Bahrain as a result of a series of improvements. Of the many available desalination techniques, RO was seen from the earliest days as a reliable and cost-effective technology and was therefore employed at Ras Abu Jarjur. From the huge quantity of groundwater (40 million m /year) extracted from borewells, potable water totalling 29 million m /year is produced. The other 30% of water is being rejected to the Arabian Gulf, which has a similar salinity level and higher temperatures. Trials are being carried out to extend the brine staging by one more stage from two to three for the ninth and tenth trains and from three to four for the first to eighth trains, as the reject water from the trains is already filtered, acidified, dosed with antiscalant and most importantly possessing the required pressure energy (minimum of 38 bar) to be used. This strategy would increase the overall water recovery by another 4.5%. By closely following the guidelines of the scaling indices, solubility product limits of potential scale-forming constituents in the water and various performance-monitoring tools, it would be possible to recover another 2% of the water. The full article first appeared in the November/December 2008 issue of D&WR magazine. The paper on which it was based was awarded the prize for Best Oral Presentation at the International Desalination Association World Congress in Maspalomas in 2007.

Antiscalant removes need for acid in wastewater RO

Field trials of a new scale-inhibiting chemical for use with reverse-osmosis membranes in wastewater reuse plants show that, at a low dose rate, it can increase the solubility of calcium phosphate by over one hundred times, obviating the need for using dangerous and costly acid. Current design practices for large effluent reuse projects are focused on a combination of removing phosphate by precipitation prior to the RO plant and acid dosing to reduce pH to 6.0 and hence increase calcium phosphate solubility to prevent fouling. Conventional antiscalants are ineffective at high phosphate and high recovery rates, and the only other option has been to dose large quantities of acid to reduce feed pH to below 6.2. Reducing the pH from 7.5 to 6.0 on a 2,700 m /day plant would require 0.5 to 1 ton of 95% sulphuric acid per day. Handling this quantity of acid is an environmental, health, safety and logistical problem that many plant operators would like to move away from. The results from the field trials show that using a highly active threshold inhibiting antiscalant such as Genesys PHO at a low dose rate of 2 -5 mg/L can increase the solubility of calcium phosphate by over one hundred times. This article appeared in D&WR magazine's August/September 2008 issue.

From top left: Juan Miguel Pinto, Energy Recovery Inc, Guillaume Clairet, H20 Innovation, Renato Ramos, Dow Water & Process Solutions, and Miguel Angel Sanz, Suez

The experts' pick of the panels at IDA World Congress 2017

The crack team behind the technical program at IDA World Congress 2017 in Sau Paulo, Brazil, have selected their personal not-be-missed favourite sessions from a packed line-up.

The screens on the wedgewire water intake system that Poseidon is proposing for its seawater RO desalination plant at Huntington Beach, California, will be 1mm wide in order to meet new regulations

Huntington Beach is 'precedent-setting' for California

When the California State Water Board adopted new regulations on seawater desalination plants in 2015, Poseidon, the developer of a proposed 50 million gallons a day (189,000 m3/d) capacity seawater RO plant in Huntington Beach, California, went back to the drawing board on its water intake technology.

IWA looks at organic matter in treatment and reuse

The International Water Association (IWA) is holding a specialist conference with the Australian Water Association (AWA) in Perth in October 2013 on natural organic matter (NOM), which will look at its effects on water treatment and reuse, and desalination.

Australian SWRO firm signs MoU for Saudi pilot

Australian desalination start-up Water Resources Group (WRG) announced on 4 December 2012 that its subsidiary Water Resources International (WRI) had signed a memorandum of understanding with Knowledge Industry Company (KIC) of Saudi Arabia.

Biofouling agent finds success in seawater RO desalination plant

Since Kurita Water Systems introduced a new slime control agent for membranes at the International Desalination Association congress in Dubai in 2009, the company has been using the chemical in many different commercial reverse-osmosis plants throughout the world, where it has proved to be quite effective. This article discusses the agent's advantages for RO systems and uses an SWRO desalination plant in China as a case study. This article first appeared in the August/September 2012 issue of Desalination & Water Reuse magazine.

IDA scholarships for PhD students in US and Singapore

The International Desalination Association (IDA) has awarded its Channabasappa Memorial Scholarship for 2011 to Errol M Glenn of the USA and Sim Siang Tze Victor of Singapore.

Desalitech building demo plant with Layne Christensen

The originator of the Closed Circuit Desalination (CCD™) technology, Desalitech Ltd, announced on 30 June 2011 that it will work with mineral and water drilling and treatment company Layne Christensen to design and build an innovative desalination system.

Dow's new range is designed for hard-to-treat industrial waters

Dow brings out new line designed for tough industrial waters

Dow Water & Process Solutions has added a new product line, Dow Filmtec Fortlife, to its reverse osmosis and nano filtration portfolio.

A pilot Desalitech SWRO commercial plant

Desalitech closed-circuit technology set for BWRO project

Israel-based Desalitech Ltd announced on 7 April 2011 that it had been awarded a contract to design and build a reverse osmosis (RO) desalination system for Environmental Protection Technologies (EPT), a global company that leads the industrial wastewater treatment market in Israel.

IDA releases more detail of Portofino conference

Abstracts of four "notable" papers for the the International Desalination Association's (IDA) Desalination Industry Action For Good conference in Portofino, Italy, in May were sent out by the association on 18 February 2011.

4th Membranes & Desalination event set for Gold Coast

The Membranes and Desalination Specialty IV Conference, to be held in Gold Coast on 11-12 February 2011 by the Australian Water Association, has a problem solving focus.

Conwed in feed spacer study

Plastic netting maker, Conwed, has provided its products for a study into options for developing and testing of feed spacers in reverse osmosis (RO) by numerical modelling, three- dimensional (3D) printing of feed spacers and experimental membrane fouling simulator studies.

Pilot tests for dopamine anti-fouling technology

Seed capital totalling US$ 500,000 for the development of a dopamine-based membrane anti-fouling technology has been raised by Advanced Hydro Inc (AIC), based in Austin, Texas, USA, the company announced on 6 January 2009.

Low-Biofouling Polypropylene Feedspacers for Reverse Osmosis Applications

Polypropylene (PP) is a commercial polymer that is ubiquitous in membrane filtration as feedspacer due to its high chemical stability, low cost and versatile properties. The goal of this project was to develop low-biofouling polypropylene reverse-osmosis (RO) feed spacers, which can be used for desalination, through the functionalization of PP with copper ions since copper is believed to interfere with enzymes involved in cellular respiration and bind DNA at specific sites. Copper-charged polypropylene and unmodified polypropylene feedspacers were used in RO filtration experiments with dechlorinated tap water as feed water in parallel for 48 hours. The results indicated that charged polypropylene could be used as RO feedspacers for numerous applications, such as desalination, and could increase performance and longevity while ultimately decreasing cost. This article appeared in the May/June issue of D&WR magazine.

Biofouling - a new start

This article first appeared in the August 2015 issue of Desalination & Water Reuse magazine.

The word on the sheet: biofilm has a script

How could an understanding of the chemical language of microbes unlock the enigma of biofouling? Studies looking at the communications between bacteria that lead to the build up of biofoulant reveal opportunities to scramble the messages and possibly remove this thorn in the side of membrane desalination. This article first appeared in the May 2015 issue of Desalination & Water Reuse magazine.

Melbourne researchers' anti fouling membrane claim

Researchers from the Melbourne School of Engineering at the University of Melbourne have developed what they claim to be an anti fouling microfiltration system that outstrips existing technology on energy efficiency with negligible compromise on performance.

Q&A: De Nora group CEO Paolo Dellacha on the acquisition of MIOX

Electrochemical tech company De Nora has acquired water purification firm MIOX. De Nora group chief executive Paolo Dellacha explains the thinking behind the deal and what the future holds

Researchers uncover new membrane fouling mechanism

Researchers have uncovered "an additional reverse osmosis (RO) membrane fouling mechanism" arising from organic compounds present in ultrafiltration (UF) permeate during wastewater desalination.

The new manual, Harmful Algal Blooms and Desalination: A Guide to Impacts, Monitoring, and Management, synthesizes knowledge from multiple case studies

First guide to harmful algal blooms launches at IDA World Congress 2017

UNESCO Intergovernmental Oceanographic Commission (IOC) and Middle East Desalination Research Centre (MEDRC) introduced the world's first guide to harmful algal blooms (HABs) on Tuesday 17 October 2017, at IDA World Congress.

Registration opened for next IDA Academy courses

The International Desalination Association has opened registration for the next IDA Desalination Academy courses in Singapore on 16‑19 September 2013.

Dr Isabel Escobar

Escobar appointed as editor-in-chief of IDA journal

Dr Isabel Escobar of the University of Toledo, Ohio, USA, has been appointed by the International Desalination Association (IDA) to succeed Dr Jim Birkett as editor-in-chief of the IDA Journal of Desalination & Water Reuse.

Singapore and Tianjin next IDA Academy venues

Singapore is the venue for the next course in the schedule of the International Desalination Association (IDA) Academy.


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