Hanovia Appoints Global Business Manager For Industrial UV Water Disinfection Markets

UV disinfection specialist Hanovia (www.hanovia.com) has appointed Halim Mirza as its new Global Business Manager for industrial markets such as food and beverage processing, pharmaceutical and microelectronics manufacturing, as well as specialist healthcare applications.

Halim Mirza Appointed as Global Business Manager for Hanovia Industrial UV Water Disinfection Markets

Halim Mirza Appointed as Global Business Manager for Hanovia Industrial UV Water Disinfection Markets

Photo: http://www.halmapr.com/hanovia/halim_mirza.jpg (692 KB)

Halim is a Chartered Engineer and a member of the Institute of Chemical Engineers. With a BSc in Chemical Engineering and an MSc in Ion Exchange and Membrane Technology, he has spent his entire career in the water treatment industry. Prior to joining Hanovia he was with Elga Process Waters (part of Veolia Water Systems), where he held various positions in both management and technical sales engineering, and more recently international business development.

Commenting on the appointment Hanovia’s Sales Director, Keith Watson, said, “Halim has a wealth of international sales experience in water treatment and his appointment emphasises our on-going commitment to developing the industrial market. Halim’s role will be to manage Hanovia’s global industrial distributor network and also strengthen our ties with both OEMs and end-users world-wide, ensuring Hanovia stays at the forefront of the global UV disinfection business.”

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Hanovia Launches New UV Transmittance Analyser For Water Disinfection Monitoring

The new TX Online UV transmittance analyser from Hanovia has been specifically designed to provide accurate monitoring of UV water disinfection systems in the food and beverage, brewing, pharmaceutical, electronics, aquaculture and marine (ballast water treatment) industries. The TX Online’s one-piece design allows simple mounting and uses minimal space. Its new optics provide increased accuracy and more consistent readings with online and laboratory analysers.

Tx Online

A unique feature of the TX Online is an ultrasonic automatic cleaning system that keeps the optical chamber clean at all times. This ensures accurate, consistent reading of percentage UV transmittance at all times and reduces the need for manual cleaning. In addition, a bubble rejection system which eliminates air from a sample while simultaneously creating a vortex cleaning action throughout the optical chamber.

The unit has a 0 – 100% transmittance range and response time can be adjusted to allow the user to program readings between 4 – 60 seconds. Calibration is inexpensive due to the small sample volume requited (only 30ml) and removable sample cuvettes allow for easy cleaning and calibrating. An adjustable backlight display allows viewing in low light conditions. A 4-20 mA output is provided as standard and an RS-485 output with Modbus protocol is available as an optional extra.

The TX Online is certified to CE, UL and CSA (ETL, ETLc). The calibration standard is prepared as outlines in ‘Standard Methods for the Examination of Water and Wastewater, 20th Edition, Method 1080 A-C, Methods for Preparation of Reagent Water’.

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The Use Of UV For Dechlorination

For many years chemical disinfection techniques have been used to provide microbiologically pure water for industrial and domestic use. Free chlorine, typically introduced by municipal water treatment plants in gaseous form, has been employed for many decades as a primary oxidizing agent for the control of microbiological growth. Free chlorine can also be introduced through the injection of sodium hypochlorite, chlorine dioxide and other chlorine compounds.

Hanovia UV chamber

When chlorine is injected into waters with naturally occurring humic acids, fulvic acids or other naturally occurring material, trihalomethane (THM) compounds are formed. Approximately 90% of the total THMs formed are chloroform, with the remaining 10% consisting of bromodichloromethane (CHCl2Br), dibromochloromethane (CHBr2Cl) and bromoform (CHBr3). Since THMs have been shown to be cancer-causing to laboratory animals in relatively low concentrations, there is concern about limiting their prevalence. The United States Environmental Protection Agency  (USEPA), for example, has set the maximum contaminant level in primary drinking water to be 100 parts per billion (ppb).

Although chlorine is widely used in industry, many processes cannot tolerate it because of contamination and unwanted chemical reactions. It can accelerate corrosion of process vessels and piping and also causes damage to delicate process equipment such as reverse osmosis (RO) membranes and deionization (DI) resin units. It can also affect the taste, flavour and smell of drinks and liquids. It therefore must be removed once it has performed its disinfection function.

To date, the two most commonly used methods of chlorine removal have been granular activated carbon (GAC) filters or the addition of neutralizing chemicals such as sodium bisulphate. Both of these methods have their advantages, but they also have a number of significant drawbacks.

Granular Activated Carbon (GAC)
Activated carbon is frequently used in industrial applications such as beverage and pharmaceutical manufacturing and in point-of-use units for residential and commercial applications. However, GAC filters, which are usually located upstream of the RO membranes, also can serve as an incubator of bacteria because of their porous structure and nutrient-rich environment. Additional problems encountered with the use of GAC filters are:

• Increased head loss
• Regeneration costs
• Unpredictable chlorine breakthrough

Sodium Metabisulphite or Sodium Bisulphate
This is either purchased in solution or bought as a dry powder and then mixed on site. It is commonly injected in front of RO membranes used in the pharmaceutical and semiconductor industries. One common problem with this approach is that the solution itself becomes an incubator of bacteria, causing biofouling of the membranes. It is also another chemical that has to be documented in use, handling and storage for regulators such as environmental protection or health and safety agencies. Additional problems encountered with the use of sodium metabisulphite are:

• Maintenance of dosing equipment
• Hazardous material to handle
• Scaling of RO membranes
• Sodium sulphate can be formed, acting as a stimulant to sulphate reducing bacteria
• Odour and taste implications also arise

The UV Alternative
An increasingly popular dechlorination technology, with none of the above drawbacks, is ultraviolet (UV) treatment. High intensity, broad-spectrum UV systems (also known as medium pressure UV) reduce both free chlorine and combined chlorine compounds (chloramines) into easily removed by-products.

Between the wavelengths 180 nm to 400 nm UV light produces photochemical reactions which dissociate free chlorine to form hydrochloric acid. The peak wavelengths for dissociation of free chlorine range from 180 nm to 200 nm, while the peak wavelengths for dissociation of chloramines (mono-, di-, and tri-chloramine) range from 245 nm to 365 nm. Figure 1 shows the UV output of a high intensity Hanovia medium pressure UV lamp. Up to 5ppm of chloramines can be successfully destroyed in a single pass through a UV reactor and up to 15ppm of free chlorine can be removed.

Many water treatment systems include RO units, which commonly use thin-film composite membranes because of their greater efficiency. However, these membranes cannot tolerate much chlorine, so locating the UV unit upstream of the RO can effectively dechlorinate the water, eliminating or greatly reducing the need for neutralizing chemicals or GAC filters.

The UV dosage required for dechlorination depends on total chlorine level, ratio of free vs. combined chlorine, background level of organics and target reduction concentrations. The usual dose for removal of free chlorine is 15 to 30 times higher than the normal disinfection dose. Membranes therefore stay cleaner much longer because the dose for dechlorination is so much higher than the normal dose used if dechlorination was not the goal. Additional important benefits of using UV dechlorination are:

• High levels of UV disinfection
• TOC destruction
• Eliminate safety hazard associated with mixing bisulphate
• Eliminate risk of introducing micro-organisms into RO (via GAC or injection of neutralizing chemicals)
• Overall improved water quality at point-of-use

As with other dechlorination technologies, the UV dosage required at a given flow rate is dependent on several process parameters, including:

• Process water transmittance level
• Background organics level
• Influent chlorine level and target effluent chlorine concentration level

UV Applications
Successful UV dechlorination applications range from pharmaceutical, food and beverage processing to semiconductor fabrication and power generation. In all these industries, dissatisfaction with conventional dechlorination methods has encouraged alternative methods to be found. The following are examples of some applications in which high-intensity, broad-spectrum output (medium-pressure) UV has been successfully used for dechlorination:

Pharmaceutical industry
A Hanovia UV dechlorination unit was installed at a Procter & Gamble manufacturing plant in the Georgia. The unit was installed before two banks of RO membranes; prior to this dechlorination was achieved using sodium bisulphate. Trials run soon after the UV system’s installation showed a dramatic reduction in the RO membrane wash frequency – down from an average of eight cleanings per month to only two per month – amounting to annual savings of $70,000. The number of shutdowns for RO membrane maintenance has also been significantly reduced.

Brewing industry

Many breweries, soft drinks manufactures and other processors use UV for general disinfection of product make-up and process water. UV kills all known spoilage microorganisms, including bacteria, viruses, yeasts and moulds (and their spores) and has many advantages over alternative methods. Unlike chemical biocides, UV does not introduce toxins or residue into process water and does not alter the chemical composition, taste, odour or pH of the fluid being disinfected.

One example is Shepherd Neame brewery in the United Kingdom, one of the oldest in the country. It uses a UV system to treat water drawn from a private well and used for deoxygenated beer cutting. The water passes through the UV treatment chamber before entering a storage tank, and from here it passes through a series of sterile filters before use. In addition to treating cutting water, the UV system also disinfects water used for bottle rinsing.

As can be seen from the above examples, the potential applications for high-intensity, medium-pressure UV for dechlorination and disinfection, and the benefits it brings, cover a wide variety of industries and processes. UV dechlorination offers real opportunities for those willing to invest in this innovative technology.

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Hanovia Appoints New China Country Manager For Industrial UV Disinfection Applications

British UV disinfection company Hanovia has appointed George Wang as its new China Country Manager. A subsidiary company of Halma p.l.c., Hanovia is one of the world’s leading UV disinfection system manufacturers for process water applications, with major installations in China, southeast Asia, Australasia, north and south America, Europe, the Middle East and Africa.

George Wang

George has a Masters Degree from East China University of Science and Technology and has many years’ experience in research into various aspects of water treatment. His extensive knowledge of water treatment technology and UV disinfection will be very important in his new role.

“My role will be to help Hanovia develop partnerships with competitive sales and engineering companies in China which will allow us to offer the best, local service for our customers in this country,” commented George on his appointment. A highly qualified, dedicated individual, he brings to Hanovia valuable experience which will ensure the company maintains its position as a leader in UV technology applications.

Hanovia’s main markets in China are industrial users of process water such as semiconductor and pharmaceutical manufacturers, food, beverage and brewing, aquaculture and also operators of indoor swimming pools and spas.

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New UV Disinfection System For Industrial Process Water

Designed for industrial and pharmaceutical process water applications, Hanovia’s new AF3 amalgam* UV disinfection system offers a high microbial kill rate with low power consumption and low hydraulic pressure drop. Designed using CFD modelling tools, it is extremely flexible and can be installed either horizontally or vertically.

Hanovia AF3 UV system

The AF3’s unique configuration produces an axial flow through an L-shaped, elongated treatment chamber, increasing residency time and improving disinfection performance. It can treat flow rates of up to 50 m3/hour.

With a life of up to 16,000 hours, the system’s UV lamps produce up to three times the UV output of standard mercury low pressure lamps. A key feature of the lamps is their ability to operate at temperatures up to 40oC (compared to 18oC for conventional low pressure lamps) without any significant loss of germicidal output and efficiency.

The AF3 also uses fewer UV lamps and less electrical power to generate a given UV output compared to conventional low pressure UV technology. Optimised for the delivery of drinking water disinfection doses, the germicidal performance of the AF3 is of the highest standard, satisfying international regulatory requirements.

To ensure the AF3 integrates simply and effectively with a variety of installation requirements, three levels of control are available, all with outputs linkable to building management or SCADA** systems. Combining a microprocessor-based control system with an “intelligent” electronic ballast, the system’s Electron controller provides a versatile combination of controls, alarms and clear indicators.

An optional UV monitor allows constant measurement of UV intensity delivered by the lamp, displayed on the Electron controller’s screen as a percentage. Intensity output can also be linked to the plant SCADA system.

A version of the AF3 built to cGMP*** requirements for pharmaceutical and sanitary applications is also available. Constructed using highly polished stainless steel with FDA**** approved seals, all welds are full penetration and ‘bug trap’ free. Tri-clamp connections also make it simple to disassemble and verify cleanliness.

*Amalgam = low pressure, high output UV lamps
**SCADA = Supervisory Control and Data Acquisition
***cGMP = Current Good Manufacturing Practices
****FDA = Food & Drink Administration (USA)

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