With higher requirements for food safety today, liquid sugar is required to be produced according to stricter quality standards. In the production of liquid sugar, although the concentrated syrup itself contains high osmotic pressure, which prevents some bacteria and microorganisms from reproducing. But such pressure doesn’t have much effect on microorganisms that exist in the form of spores. What’s more, they reproduce more quickly when the syrup is diluted. Problems caused by the accumulation of bacteria and microorganisms include odors, color changes, and shortened shelf life. This will increase the risk of infection risks and health concerns. As a non-chemical method of microbial control, ultraviolet has a good killing effect on food spoilage microorganisms, including viruses, bacteria, spores and molds, etc. Moreover, since no chemicals are required, liquid sugar UV sterilization is an environment-friendly and low-cost solution to improve product quality.
How does ultraviolet sterilization work?
On the electronic spectrum, ultraviolet lies between visible light and X-rays. Ultraviolet between 185 and 400 nm is called UV-C, which has a powerful sterilization effect. Ultraviolet can penetrate the cell membranes of microorganisms and make them unable to live and reproduce by damaging their DNA structures.
Typically, an ultraviolet sterilization system consists of one or more UV lamps encased in protective quartz sleeves. These UV lamps will then be installed into a cylindrical stainless-steel chamber. When it is working, the liquid to be processed enters one end of the chamber and exits the other after being radiated by the UV lamps. There are many kinds of liquids that can be treated with UV sterilization, including viscous fruit juices and syrups, beverages, raw municipal water, process water, and various types of wastewaters.
Why is UV the best choice?
Compared with other methods, the choice of ultraviolet for liquid sugar sterilization is based on the characteristics of ultraviolet itself. In the sterilization process, UV light will not add any harmful ingredients and residues to the liquid sugar, nor will it change the original taste, smell and pH value of the liquid sugar.
UV Sterilization in Liquid Sugar Production
Liquid Syrup
Ultraviolet removes most of the yeasts and molds that will otherwise change the original taste of the syrup. Unlike water, syrup have a lower UV transmission rate due to its higher density. Therefore, to ensure that liquid sugar can be effectively sterilized, it is usually recommended to use high intensity, medium pressure UV lamps in equipment, rather than low pressure UV lamps.
Water Supply
Municipal water supply usually does not contain too many harmful microorganisms, but you cannot promise whether there will be yeasts and molds. Meanwhile, water from other private sources is more likely to be contaminated. Pre-treatment of all water supplies with ultraviolet will control the potential contamination at its source. Ultraviolet can also make the reuse of water possible, which will not affect the quality of the final products, and at the same time, improve the utilization of water resource.
Filter Sterilization
It is possible that bacteria exist in the reverse osmosis (RO) and granular activated carbon (GAC) filtrate. And as a mature method, ultraviolet can effectively have them sterilized.
Dechlorination
Process water needs to be dechlorinated through a GAC filter to remove odors produced in the chlorination process. This will ensure that the final liquid sugar product is not contaminated and does not carry any unwanted smells. Therefore, UV sterilization equipment should be installed in front of the GAC filter for dechlorination in order to improve the performance of the filter.
Wastewater Treatment
Thanks to the fact that process water used for liquid sugar production can be treated and reused with the help of ultraviolet treatment, the amount of wastewater produced in the production process can also be significantly reduced. Moreover, wastewater can be properly treated without the use of chemicals that will be hazardous to the environment.
The production of liquid sugar is subject to strict industry standards, so it is often a tough challenge for manufacturers. UV sterilization is a wise option for manufacturers expecting the improvement of the quality of their final products. And the advantage of the UV systems also lies in their convenience in installation and maintenance. The only requirement will be to replace the UV lamps every six months or a year or so. It will be a very simple work for the maintenance personnel, which generally costs a few minutes to complete.
Ultraviolet sterilization has been widely applied in aquariums, swimming pools, beverage production enterprises and wastewater treatment fields. The application of ultraviolet can ensure an efficient sterilization effect, which has been unanimously recognized by users from multiple industries.
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