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114141 ADVANTEX* O&M MANUAL. #40� Troubleshooting Nitrogen Filtrate DO Levels Outside Range of Reduction 2.5-6 mg/L — If your filtrate DO is Lqq lgyv_ (indicating insufficient oxygen),you may experi- If you suspect that the System is not meeting ence periodic sulfide odors during dosing events, expectations for nitrogen reduction,troubleshoot or perhaps a more lasting smell within the filter each of the critical factors that contribute to opti- pod.Try the following. mum nitrogen reduction,to determine a cause. * Check for surface clogging/ponding and dean Filtrate Alkalinity Too Low — Available allm- as necessary unity determines the degree of nitrification possi- • Check air flow through the vent assembly ble for any wastewater treatment system,because . Check the recirc ratio;if it's too low(<2:1�) it takes 7.14 parts alkalinity to nitrify 1 part increase as necessary* ammonia If filtrate alkalinity is too low: If your filtrate DO is too high(indicating excessive aeration),its likely that excessive • Check the recirc ratio;a high recirc ratio recirculation or insufficient hydraulic retention -increases alkalinity consumption* time are factors.Try the following: • Check influent TKN or anmmonia levels and • Decrease the recirc ratio* source alkalinity High Filtrate Ammonia Levels — Because If a large quantity of nitrification is required,it ammonia is consumed during nitrification,high may be necessary to add a buffering compound ammonia levels are a sign that something is to the system,to raise alkalinity levels. remiss.Try the following. Filtrate pH Too Low — Nitrification is particu- • Check for surface dogging/ponding and clean larly sensitive to pH but tends to thrive at levels as necessary between pH 7.2 and 9.The nitrification process . Check for sufficient aeration(measure DO) releases hydrogen that consumes alkalinity and causes pH levels to drop. • Ensure no blockage of air flow into textile filter A pH level of<6 retards microbial activity of all (indicated by thick biomat development or a kinds,including denitrification.Maintaining an build-up of grease and oils) alkalinity of 50 to SO in the effluent is typically • Ensure no blockage in the manifold,causing... sufficient to maintain pH levels above 5.5.If the _Localized hydraulic overloading,saturation filtrate pH level is too low: —Short circuiting • Check influent alkalinity level(pH drops when too much available alkalinity is consumed} • Check for sufficient alkalinity;if insufficient, consider supplemental buffering. Call Orenco • Check recirc ratios;reduce if too high* Engineering for assistance,if necessary. • Ask system user about chemical discharges into the system,including carpet cleaners,chlorine, and photo developing agents oe *Krep in mind that a rmrc ratio thats too high can generate.a highly aerobic biomat growth on the pump filter,and a recirc ratio thou too low can tend to liberam periodic odor;during dosing events. So search for the optimum ratio (typically between 2 and 4:1)