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BioRtration Process <br /> BioFiltration is a secondary biological treatment process that relies on the <br /> phenomenon of enaturally occurring microorganisms to remove waste from <br /> water. The organisms form a zoogloea, or jelly-like mass, that grows on a <br /> fixed media, such as rocks or plastic blocks. A non-technical approach to <br /> describing biofiltration is to explain the process by which the organisms <br /> work. Microorganisms, or "organisms," form colonies called a zoogloeal mass, <br /> that in a favorable environment, will perform three important steps; eat, <br /> grow and multiply. <br /> The three steps take place simultaneously in the biofilter facility. Eating is <br /> the primary function of removing waste. First, the organisms come into <br /> contact with the food particle and through the process of absorption and <br /> adsorption, the food is passed into the organism body (cell wall). As the food <br /> is metabolized (used), it is changed into water and carbon dioxide. Therefore, <br /> biofiltration is the process of converting waste into water, carbon dioxide, <br /> minor amounts of inert matter, and more organisms as shown in Figure 1. <br /> Figure 1 <br /> Sn s�S of The second simultaneous step is <br /> w growing. Here again, with good <br /> �~' H2O conditions the zoogleal mass will <br /> 02 grow by the process referred to as <br /> CELL �' "' synthesis, ' or simply put, <br /> :za <br /> A"' multiplying. For example, one bug <br /> will split into two, which will split <br /> """ into four, which will split into eight, <br /> MUM= etc. When conditions are good, an <br /> CDMM organism can split as frequently as <br /> every 20 minutes. <br /> LIoum Sloughing is the most phenomenal <br /> feat biofiltration performs. As the zoogleal mass builds up on the media, <br /> portions will break off and sink to the bottom of the secondary clarifier. <br /> Biofiltration Condition Requirements <br /> Three major requirements for biofiltration are contact time, recirculation and <br /> ventilation. <br /> Time is required for the simultaneous reactions and for the three steps of <br /> eating, growing and multiplying. Time is usually a design decision and <br /> 7H Technical Services Group Operation &Maintenance Manual <br /> BioFiltration Process Page 7 of 26 <br /> Rev991215 <br />