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GrenClOr Design AdvanTex Treatment—Second Stage of Two-Stage and Three-Stage Treatment Purpose and Description: A second stage of AdvanTex treatment can be used cost-effectively for enhanced nitrification or polishing: • Nitrifying the waste stream for systems with very low ammonia(NH3 N)or TKN discharge requirements—typically>95%removal(nitrification) • Removing any excess BODS that is not consumed in the denitrification process following the post-anoxic stage on projects with restrictive BOD5/cBOD5 permit limits,typically 20 mg/L or less(polishing) • Removing BODS for systems with NOT TO EXCEED permit limits of<10 mg/L BOD5/cBOD5 or 30-day average permit limits of s 5 mg/L BODS/cBODS(polishing) The treatment mechanisms are the same as described under Standard AdvanTex Treatment Stage on page 13. For sizing requirements, refer to the AdvanTex Unit Sizing section of this document. For information on the importance of pH and temperature on the nitrification process,see pH Effect on Nitrification and Temperature Effect on Nitrification and Denitrification in the Design Considerations section on page 19. Final Polishing Treatment Stage—Third Stage of Three-Stage Treatment Purpose and Description: An AdvanTex Final Polishing Stage unit is typically used for final polishing of BOD5/cBOD5 for projects with high influent organic and/or nutri- ent loads and strict organic and nutrient limits: • Nitrifying the waste stream for systems with very low ammonia(NH3-N)or TKN discharge requirements—typically>90%removal(nitrifica- tion) • Removing any excess BODS that is not consumed in the denitrification process following the post-anoxic stage on projects with restrictive BOD5/cBOD5 permit limits,typically 20 mg/L or less(polishing) The treatment mechanisms are the same as described under Standard AdvanTex Treatment Stage on page 13. For sizing requirements, refer to the AdvanTex Unit Sizing section of this document. For information on the importance of pH and temperature on the nitrification process see pH Effect on Nitrification and Temperature Effect on Nitrification and Denitrification in the Design Considerations section on page 19. Disinfection Stage Purpose and Description: Secondary-treated effluent is usually clear and odorless, but it still contains pathogens at levels that can cause illness if ingested or released to the environment. Disinfection is required in many surface discharge or reuse systems. Disinfection can be achieved by any method that destroys pathogens; ultraviolet(UV) rays,chlorine (tablet or gas),and ozonation are the most common methods. Due to the low turbidity of AdvanTex effluent and the fact that UV disinfection requires no chemicals and leaves no toxic residue, UV disinfec- tion is the most common method used following AdvanTex systems. Chlorination is also a common disinfection method that is utilized; however, handling issues and concerns about chemical residue make it less desirable than UV. Ozonation,another common method, is extremely effective and popular for re-use applications within facilities (e.g. toilet flushing), due to its ability to remove any residual color in the effluent stream. Ozonation is typically the least economical of the three methods in the lower flow applications common with decentralized systems. Design Notes and Special Considerations: UV disinfection lamps require cleaning and servicing on a regular basis(once a month to once a year,depending on effluent quality and UV system design). Disinfection devices can be integrated into the treatment system and connected to the TCO MTM control system for monitoring and control. Reuse applications,such as for toilet flushing and industrial processes, require a high level of effluent purity. Chlorination or ozonation are often used in these applications. In some circumstances,tertiary treatment may be required.This can include(in addition to chemical or ultraviolet disinfection)the use of fine mesh filter processes such as polishing filters; multi-media filtration; micro-, ultra-,or nano-filtration through membranes; reverse osmosis; or cloth/disc filters. Contact Orenco for more information. NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com Rev.8,010/20 Page 14 of 38