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The spread of aquatic invasive species through ballast water can be made at fivergroup.com is often a major ecological and economical threat. Because of this, the International Maritime Organization set limits towards the concentrations of organisms allowed in ballast water. To meet these limits, ballast water treatment systems were developed. The main techniques used by ballast water treatment are ultraviolet (UV) radiation and electrochlorination. In this study, phytoplankton regrowth after treatment was followed for six BWTSs.

Natural plankton communities were treated and incubated for 20 days. Growth, photosystem II efficiency and species composition were followed. The three UV systems all showed similar patterns of lowering of phytoplankton concentrations then regrowth. The two EC plus the chlorine dioxide systems showed comparable results. However, UV- and chlorine-based treatment systems showed significantly different responses. Overall, all BWTSs reduced phytoplankton concentrations to below the IMO limits, which represents a lower life expectancy risk of aquatic invasions through ballast water.

Ultraviolet light incapacitates microorganisms by deactivating their DNA, making multiplication impossible or killing the organism outright. It does this without significant change to your water chemistry, and directly affects only organisms that happen to be exposed to your UV (specifically UV-C) rays themselves, so it is really a very safe and clean process, especially in comparison with medication. UV may be effective in controlling lots of microorganisms, and possesses been used as being a disinfecting process in other fields like medicine, in addition to tap water and wastewater strategy for decades.

The two main functions for Ultraviolet light in ornamental fish culture are as "clarifiers" to lessen green water algae in ponds, in addition to being "sterilizers" to lessen waterborne pathogens in aquariums. The same UV units can be employed for either application; it's a matter of "zap dosage". Each organism features its own tolerance to UV, based largely on its size and structure. The zap dosage, expressed in microwatt-seconds per square centimeter, for many people bacteria is under15 thousand for waterborne microalgae about 20-30 thousand while protozoan parasites might require 45-90 thousand or additional. Thus, a UV setup that may be suitable for zapping bacteria will need to be about doubly powerful to eradicate algae, and 3 in order to six times as strong to manage smaller protozoan parasites. It may not what you need to attempt to manipulate larger parasites with ultraviolet radiation, and parasites that multiply without spending significant time in water column will obviously be unaffected.
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Topic revision: r2 - 2017-09-02 - LaisonChen
 
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