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GrencOr Design Waste Stream O Primary Treatment Standard AdvanTex Systems ©Pre-Anoxic Treatment Use for BODS/cBODS,TSS, and Nitrogen Discharge Limits •See Appendix A for sizing Organic removal is the simplest form of advanced treatment,typically O Q Standard AdvanTex Treatment requiring only primary and secondary treatment.When loaded at or below the II g y typ •Sizing Equations 1.1,1.2 applicable loading rates,standard AdvanTex Treatment Systems i- cally achieve treatment levels of<10 mg/L BODS/cBODS and TSS(based Q Pre Anoxic Return Line on 30-day average or 30-day arithmetic mean),and they typically provide © O reduction of total nitrogen(TN)>60%and removal of ammonia(NH3-N)of 95%(range 90-99%). Figure 4 shows the typical configuration for discharge limits associated with these constituents.See the AdvanTex Unit Sizing section of this 4 document for the sizing equation listed. A pre-anoxic stage is recommended for all organic-only removal applica- Discharge tions and it is required for systems with high-strength primary treated Figure 4.Treatment Diagram for Removal of Organics effluent(Application Types 5&7). A two-stage AdvanTex system will be necessary for systems with discharge limits of NOT TO EXCEED 10 mg/L BODS/cBODS or for discharge limits of Waste Stream Q Primary Treatment s 5 mg/L BODS/cBODS based on a 30-day average or 30-day arithmetic mean. © Pre-Anoxic Treatment O •See Appendix A for sizing AdvanTex Systems for the Advanced Removal of Nitrogen Q Standard AdvanTex Treatment Use for Systems with Permits Requiring Discharge Limits of •Sizing Equations 1.1,1.2,1.3 60-90% Removal of Total Nitrogen,Total Inorganic Nitrogen,or O QPost-Anoxic Treatment Nitrate Nitrogen © •Sized at 50%of Maximum For wastewater systems with permit limits for TN,TIN,or NO3-N requiring Day Design Flow greater than 60% nitrogen reduction,pre-anoxic and post-anoxic treat- 0 Q Second-Stage ment stages are needed,as well as the possible addition of both supple- AdvanTex Treatment mental carbon and alkalinity.Figure 5 shows one of the typical configura- •See Process Stage Section tions for systems with discharge limits requiring this level of treatment. © for applicability •Sizing Equations 2.1,2.2,2.3 The nitrification occurring in the AdvanTex treatment stage is heavily influ- x enced by the alkalinity required to buffer the process(7.14 mg/L alkalinity o Q oo Qpre-Anoxic Return Line per 1 mg/L of ammonia-N).pH levels of 7.5 to 8,5 are ideal for complete Q Alkalinity Feed System nitrification and should be buffered to remain above a pH of 7 for all p •Two installation options:pre- applications.The use of the pre-anoxic stage benefits overall operation of anoxic return line or just the system,since denitrification in this stage will return as much as 50% before Standard AdvanTex of the alkalinity consumed during g nitrification.A supplemental alkalinity feeder immediately preceding the AdvanTex treatment stage may still be © Q Carbon Feed System necessary to ensure sufficient alkalinity for nitrification. •Two options:mix into the pre-anoxic return line or into Carbon addition should be balanced to the wastewater flows to ensure Discharge the waste stream just prior carbon-to-nitrogen (C:N) ratios are appropriate. C:N ratios greater than g to post-anoxic treatment 4:1 are necessary and around 6:1 are preferable,to ensure that denitri- fication occurs.Carbon is added in the post-anoxic stage to maintain the Figure 5.Treatment Diagram for Advanced Removal of Nitrogen proper carbon-to-nitrogen ratio.A post—anoxic tank with carbon addition is generally adequate for applications requiring up to 80%removal of nitrogen. For applications requiring greater than 80% removal of nitrogen,a moving bed bioreactor(MBBR) is typically necessary.See Post Anoxic Treatment Stage in the Process Stages—AdvanTex Treatment Systems section for more information. Depending on permit requirements,either a one-,two-or three-stage configuration is used.When there are stringent organic removal require- ments(effluent BODS/cBODS<20 mg/L),a two-stage configuration(second stage as polishing) is often used to remove excess carbon(cBODS) prior to discharge. NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com Rev.8,©10/20 Page 10 of 38