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()ADVANTEX'" O&W, MANUAL O&M For Nitrogen Reduction AdvanTex—Treatment Systems do an excellent For a thorough description of the nitrogen job of reducing nitrogen, especially in the reduction process, see the Appendix, page 28. Mode 3 configuration,where Total Nitrogen* Typical residential levels of ammonia and is typically reduced to 10 mg/L or less. Because Total nitrogen are about 60 mg/L (ammonia) many people purchase AdvanTex—for its nitro- and<65 mg/L(Total Nitrogen). gen reducing capabilities,and because nitrogen reduction is a complex,many-staged process, it's Signs of Effective Nitrogen important to understand the process, its related Reduction factors, the signs of effective nitrogen reduction, Service providers frequently ask us,"How do I and how to keep the process optimized, know if my wastewater treatment system is reduc- ' in nitrogen?"A thorn description of k indi- a' Its also important to know the Total Nitrogen g g � p key limits required by the system user's permit. cators is included in the Appendix. Following is a j Some regulatory agencies have no requirement; brief summary: some require a specific percentage reduction of • Clear, odorless filtrate effluent (a"see and sniff a certain kind of nitrogen (90-95% nitrification test is generally considered sufficient) of ammonia nitrogen, for example); and some require that Total Nitrogen be reduced to levels •Normal-looking biomat on the textile filter at or near drinking water quality at the point of (light-brown to dark-brown and gelatinous in final dispersal. texture) Finally, because influent characteristics greatly Additional Filtrate Tests affect the amount of nitrogen reduction possible Will Show... from any given system, it's vital to know the alkalinity of your waste source and the local/ •Typically,low BOD,and high clarity regional norms for organic and ammonia • DO of 2.5-6 mg/L and odorless or odor that is j nitrogen. not a nuisance The Process • Relatively low ammonia and high nitrate levels, In nitrogen reduction, ammonia is converted to since nitrification converts ammonia to nitrate j nitrate and then reduced through bacterial action to nitrogen gas,which can be released harmlessly Troubleshooting Nitrogen to the atmosphere. Optimum nitrogen reduction Reduction requires the following; If you suspect that the System is not meeting expectations for nitrogen reduction, troubleshoot •Adequate alkalinity(lab test shows levels) each of the critical factors that contribute to opti- •pH of 6-8 mum nitrogen reduction, to determine a cause. • DO level of 2.5-8 mg/L Filtrate Alkalinity Too Low •Adequate time for the nitrifying bacteria to Available alkalinity determines the degree j develop (one to three months) of nitrification possible for any wastewater treatment system, because it takes 7.14 parts l •Adequate temperature (below 40' F retards alkalinity to nitrify 1 part ammonia. the process) • Good organic removal i Total Nitrogen is the sum of organic and ammonia nitrogen, nitrate nitrogen,and nitrite nitrogen. (TN-ON+NH3-n +NO3-n +NO2-n... or... TN=TKN-n +NO3-n +N0.2-n)