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I� ADVANT O&M MANUAL If filtrate alkalinity is too low: • Check for sufficient aeration (measure DO) •Check the recirc ratio;a high recirc ratio •Ensure no blockage of air flow into textile filter increases alkalinity consumption* (indicated by thick biomat development or a •Check influent TKN or ammonia levels and build-up of grease and oils) source alkalinity • Ensure no blockage in the manifold,causing... If a large quantity of nitrification is required,it may —Localized hydraulic overloading,saturation be necessary to add a buffering compound to the —Short circuiting system,to raise alkalinity levels. • Check for sufficient alkalinity;if insufficient, consider supplemental buffering Filtrate pH Too Low Low Filtrate Nitrate Levels A pH level of<6 retards microbial activity of all F kinds,including denitrification. If the filtrate pH Residential packed bed filters normally yield 95+ j level is too low: percent nitrification(ammonia to nitrate). ° • Check influent alkalinity level (pH drops when Therefore the ammonia levels in the filtrate should too much available alkalinity is consumed) be low and the titrate levels higher.Some denitri- cation typically is experienced through the packed •Check recirc ratios;reduce if too high* bed filter.So the normal nitrate level may vary. •Ask system user about chemical discharges into Be sure you are familiar with the mode of opera- the perathe system,including carpet cleaners, chlorine, tion,as some AdvanTek'modes are configured to and photo developing agents produce lower nitrate levels. If it appears that k Filtrate DO Levels Outside 2.5-6 mg/L nitrification is dropping ofF. Range •Check the recirc ratio;adjust as necessary* (high recirc ratios may drive pH too low for If your filtrate DO is too low(indicating insuffi- effective nitrification/denitrification and cient oxygen),you may experience periodic sulfide low recirc ratios may not provide sufficient odors during dosing events,or perhaps a more last- aeration) ing smell within the filter pod.Try the following: • Verify incoming ammonia levels • Check for surface clogging/ponding and clean •Check recirc/blend for sufficient organic food as necessary source (high BOD—see Table,page 6—may •Check air flow in the ventilation fan assembly cause greater oxygen demand through the filter, (RX only) reducing nitrification) •Check the recirc ratio; if it's too low(<3:1t) increase as necessary* Adequate Time and Temperature If your filtrate DO is too high (indicating Nitrifying bacteria require one to two months to C excessive aeration),it's likely that excessive develop,and extremely cold temperatures (below recirculation or insufficient hydraulic retention 40°F) retard that process. If the AdvanTex– j time are factors.Try the following: Treatment System has been installed in a very • Decrease the recirc ratio* cold climate, nitrification may not"kick in" for j several months until warmer temperatures are High Filtrate Ammonia Levels reached.Typically,a June-September installation Because ammonia is consumed during nitrif ca- provides the necessary temperatures for a 30-60 tion, high ammonia levels are a sign that some- day nitrification start-up time. Once nitrifiers thing is remiss.Try the following: colonize,they typically continue to nitrify through normal winter conditions.Only in •Check for surface clogging/ponding and clean severely cold regions should additional insulation as necessary be necessary. "Keep in mind that a recirc ratio thats too high can generate a highly aerobic biomat growth on the pump filter;and a recirc ratio thats too low can tend to liberate periodic odors during dosing events. So search for the optimum ratio (typically between 3 and 5:1)