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s <br /> AdvanTek"-RX Treatment Systems Overview, cont <br /> Treatment Methodology <br /> In an AdvanTekTm-RX Treatment System,wastewater percolates through the textile media, whose com- <br /> plex fiber structure provides tremendous water-holding capacity and offers an extremely large surface <br /> area for biomass attachment. The textile bed's porosity, after compaction, typically exceeds 90 percent. <br /> A visible biological film normally develops on the filter medium within a few days. BODS and TSS reduc- <br /> tions occur almost immediately. Within the filter, aerobic conditions exist that are ideal for microbes that <br /> convert ammonia to nitrate (nitrification). Other conditions exist,too,that result in further nitrogen reduc- <br /> tion within the media. In Mode 3,the filtrate recirculates back to the high-carbon, low-oxygen(anoxic) <br /> environment of the processing tank,which is ideal for microbes that reduce nitrates to nitrogen gas (deni- <br /> trification). Harmless nitrogen gas is then released freely back into the atmosphere. The acclimation peri- <br /> od for nitrification may range between four and eight weeks, or longer in colder conditions. <br /> 4 <br /> i <br /> I� <br /> I - <br /> tl <br /> ETP-RX-1 <br /> Rev.5.1©V271M <br /> Page 2 <br />