Optical instrument prototype resists biofouling
Biofouling is the growth of organisms on an object in contact with water for some time. In marine environments, it can be unicellular algae, bacteria, mussels, seaweed, or a large variety of organisms. The process starts with a biofilm of bacteria which proceeds to a point where it acts as a foundation for the growth of other organisms. It follows, then that buoy systems in oceanic environments will be particularly prone to this process. The effects of biofouling are very deleterious. Inaccuracies are introduced into measurements, maintenance visits must be more frequent and the instruments themselves have a shorter life expectancy. Consequently, partners in the EC funded BRIMOM project have tested treatments to eliminate, or reduce biofouling to an acceptable level. Two means of prevention were put under trial - hydrogel coating on the instrument and local chlorination. These were tested using representative conditions on transmissometers (optical instruments). Results showed that the local chlorination method was effective and that implementation was practical. Further studies were required to further assess the application method and consequent redesign of the optical instruments was involved following registration of the prototype design. Further to the redesign process, it is expected that the commercialisation of the product will bring about considerable advantages for users. Operational costs and capital outlay can be cut by up to 50 % and accuracy of measurements can be improved.