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t � i 1 ADVANTEX* O&M MANUAL , O&M For Nitrogen Reduction AdvanTex'Treatment Systems do an excellent • Filtrate DO level of 2.5-8 mg/L,process tank job of reducing nitrogen,especially in the Mode DO level of<1 mg/L 3 confipmtiop,where Total Nitrogen'is typical- . Adequate,time fur the nitrifying bacteria to ly reduced to'1`0 mg/L±,with influent TKN of develop(one to three months) 55-65 mg/L.Because many people purchase AdvanTms for its nitrogen reducing capabilities, ' Adequate Temperature(below 40'F retards and because nitrogen reduction is a complex, the process} many-staged process,it's important to under- • Good organic removal stand the process,its related factors,the signs of For a thorough description of the nitrogen reduc effective nitrogen reduction,and how to keep the tion process,see the Appendix,page 28.In resi- process optimized• dential wastewater,the ammonia level is typically It's also important to know the Total Nitrogen about 60 mg/L and the Total Nitrogen level is limits required by the system user's permit. Some typically about 65 mg/L. regulatory agencies have no requirement;some Signs of Effective Nitrogen require a specific percentage reduction of a cer- tain kind of nitrogen(90-95%nitrification of Reduction ammonia nitrogen,for example);and some Service providers frequently ask us,'How do I require that Total Nitrogen be reduced to levels know if my wastewater treatment system is at or near drinking water quality at the point of reducing nitrogen?"A thorough description of final dispersal. key indicators is included in the Appendix. Finally,because influent characteristics greatly Following is a brief summary: affect the amount of nitrogen reduction possible • Clear,odorless filtrate effluent(a see and from any given system,it's vital to know the sniff"test is generally considered sufficient) alkalinity of your waste source and the local/ . Normal-looking biomit on the textile filter regional norms for organic and ammonia (light-brown to dark-brown and gelatinous in nitrogen. texture) The Process Additional Filtrate Tests In nitrogen reduction,ammonia is converted to Will Show .., nitrate and then reduced through bacterial action . Typically,low BOI?5 and high clarity to nitrogen gas,which can be released harmlessly to the atmosphere.Optimum nitrogen reduction ' DO of 2.5-6 mg/L and odorless or odor that is requires the following: not a nuisance • Relatively low ammonia and high nitrate • Adequate alkalinity of approximately 2501 levels,since nitrification converts.ammonia mg/L or higher(lab test shows levels) to nitrate • pH of 6-8.Fiaxed.film microbial processes gen- erally thrive between pH 5.5 and 9.Treatment problems typically result from rapid changes in pH rather than extreme long-term mean val- ues,although long-term levels can result in less efficient process activity *Total Nitrogen is the.rum of organic and ammonia nitrogen,nitrate nitrogen,and nitrite nitrogen. (TN=ON+NH3-n +NO3-n +NO2-n...or... TN=T"-n+NO3-n +NO2-n)