Hanovia UV disinfecting cooling water at Taiwanese nylon fibre factories
Hanovia’s UV technology is disinfecting cooling water in two of Formosa Chemical and Fibre Corporation’s factories in Taiwan. The UV systems are being used to reduce microbial contamination of cooling water used in the nylon manufacturing process.
(Caption: The Hanovia UV system installed at the Formosa Chemical and Fiber Corporation. The UV chamber is covered with isolate material to keep the water at a constant temperature)
“The cooling water comes into direct contact with the nylon fibre product so the quality of the water is essential,” says Hanovia’s Asia-Pacific manager, Ying Xu. “Since the Hanovia UV systems’ installation the water quality has been consistently high, with UV transmittance up from 95% to 98%. While UV itself does not reduce suspended solids in water, it reduces other impurities, so UV transmittance has improved. For applications such as this, a transmittance value of 98% is essential, and UV is playing an important role in maintaining this,” she added.
The UV units are located immediately after the heat exchange units and before the cooling tanks. This ensures all water leaving the heat exchanger is disinfected and cannot contaminate the rest of the cooling water loop. Each UV system can treat up to 50m3/hour and each is fitted with an automatic wiper which keeps the quartz sleeves surrounding the UV lamps clean.
There are currently four Hanovia UV systems in use, three in the Zhanghua factory and one in the Xingang facility, with two more systems planned for installation in Xingang.
All Hanovia UV units can be easily integrated into plant control systems. Maintenance requirements are minimal – typically the UV lamps only need replacing once a year, an easy operation which can be carried out by on-site personnel.
About the Formosa Chemicals & Fibre Corporation
The Formosa Chemical & Fibre Corporation was founded in 1965. It now has seven business divisions and is a major manufacturer of chemicals, fibres, petrochemicals and plastic materials in Taiwan.