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Water treatment from Puresep

04 November 2010

Water is an essential raw material and the quality of feed and discharge water can have a significant impact on the efficiency, reliability, performance and cost to the site

As water costs continue to rise, the treatment and recycling of site water for use in other processes is becoming more financially advantageous. As a water process company, Puresep offer several state of the art technologies.

For the purpose of this article, three complementary technologies will be looked at; Ultraviolet irradiation (UV), PureSec Electrochlorination and PureChlor Chlorine dioxide. All of these have recently been installed at food and beverage sites across the UK.

UV is primarily employed as a disinfection process that inactivates waterborne pathogens without using chemicals. This is a result of the UV light changing the DNA and protein structure of viruses and bacteria and stops them from reproducing.

Advantages of UV disinfection include:
 Effective for all types of microorganisms, including bacteria, viruses, fungi, and protozoa such as cryptosporidium
 Low capital, operating and maintenance costs
 Compact and easy to retrofit and operate
 Efficacy is independent of pH
 No impact to the aesthetic quality of the water (taste, odour, colour)
 Safe and environmentally-friendly

The Puresep Water UV system was recently installed at a soft drinks site, as the third stage sterilant. The incoming towns water was dosed with a chlorine sterilant, and then fed through carbon beds to remove the chlorine and finally through the Puresep UV system, to ensure all viruses and bacteria are kept to extremely low levels.

PureSec Electrochlorination is the instantaneous production of sodium hypochlorite solution. Where sodium chloride is converted to low strength (1%) liquid chlorine by electrolysis. Salt and power are the raw materials for the process and the availability and source of the salt often determines the most appropriate Electrochlorinator design for a particular application.

Over recent years Electrochlorinaton has gained favour, due to the elimination of transportation and storage of chlorine gas or other disinfection chemicals meaning it’s a safe, reliable and economic method of disinfection. It is well suited to the treatment of drinking water, wastewater, cooling water, as well as other industrial applications. Lower operating cost and high level of safety means Electrochlorination is appropriate in many instances.

Puresep has recently installed a PureSec Electrochlorination system at Britvic soft drinks where the electrochlorinator replaced a chlorine gas system. The electrochlorinator produces 36kg per day of chlorine and is then fed to a storage vessel, which has a pressure transmitter that enables automated on demand batch make up. The dosing system is fully automated with a duty standby dosing pump which automatically energises the standby unit following any error signals fed back to the PLC.

Kevin Cunningham, Engineering Support Team Leader at Britvic Soft Drink says “we chose the PureSec Electrochlorination system due to its high level of safety and efficiency, and the specialised knowledge of the Puresep engineers.”

Finally, PureChlor Chlorine dioxide is where chlorine dioxide is produced through the tightly controlled mixing of Puregen base reagents. Chlorine dioxide is a powerful disinfectant making it an effective and fast acting killer, by breaking down cell walls and attacking bio film leaving no resistant strains.

It is well suited to a range of water treatment applications. PureChlor is PLC Controlled with full safety features and multiple point of use.

Applications include:
 Sterilisation, recovery and recycle of waste water
 CIP disinfection
 Feed water treatment
 Effluent treatment
 Product water

Benefits include:
 Hugely efficient low chemical usage ensuring a safer environment for everyone
 Zero harmful chlorinated by-products
 Easy future expansion
 Single chemical storage area, so no need for bulk storage
 Fast acting killer unaffected by the PH range it operates in

The PureChlor Chlorine Dioxide system has been installed at Universal Beverages, where the system feeds five points of use, these applications are; deaerated liquor, softened towns water, CIP lines x 2, and post carbon filtered water. Chris Newall Operations director, UBL says” the PureChlor Chlorine dioxide system is very efficient for our needs and the fact that we can use one system with numerous points of use makes it operationally beneficial and cost effective.”

There are numerous options to efficiently and effectively treat water; the fundamental issue is to understand which option best suites the plant in question, the application and the financial viability. A company such as Puresep Water can offer in depth consultancy services to review and assist companies with their water treatment needs to ensure performance and cost targets as well as legal requirements are met.


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