bioFAS™ Submerged Attached Growth Reactors (SAGR) Systems

bioFAS™ Submerged Attached Growth Reactors (SAGR) Systems

 

The bioFAS™ Submerged Attached Growth Reactors (SAGR) is a complete autonomous wastewater treatment unit designed to provide reliable and efficient BOD removal, nitrification and denitrification. The heart of the system is a patented high-strength linear composite material developed by BioprocessH2O scientists and engineers that has been successfully used in applications for more than 20 years. The high surface area composite material, referred to as “looped chord media”, is designed to physically entrap and bind waste digesting microbes thereby establishing a resident and stable population of organisms that effectively reduce COD, BOD, ammonia and nitrate. The bioFAS™ SAGR systems are high rate compact biofilm systems that are simple to operate and resilient to toxic shock loads. BioFAS SAGR media cassettes (tensioned media laced between an upper and lower support frame) can be fabricated to fit new or existing system process tanks and are supported by corrosion resistant FRP, PVC or 304SS support frames.

How the bioFAS SAGR Process Works

After pretreatment such as pH adjustment, screening, removal of oil & grease, etc. the wastewater is directed to the bioFAS™ SAGR process. Within the bioFAS™ SAGR tank, the wastewater is run through thousands of feet of tensioned liner composite material laced between an upper and lower support framework.   The design provides high biofilm surface to wastewater exposure, superior gas exchange, and prevention of short-circuiting because biofilm is fixed to tensioned media and not packed. Air is introduced into the SAGR using a blower and diffuser assembly to provide oxygen for bacterial respiration and to ensure complete mixing. The attached growth biofilm exposed to the pollutant load metabolizes the pollutants in an aerobic or anoxic environment. The dead microorganisms continuously slough off of the surface of the biofilm due to the mixing regime established in the bioreactor. The sloughed solids are then discharged through the effluent piping in the form of suspended solids (TSS). The suspended solids are concentrated and removed using a secondary clarifier or dissolved air floatation (DAF) System.The bioFAS HRBF BioFilter is a high-rate spray tower that uses LCM BioFilm media to efficiently entrap, hold and become a ridged support for wastewater digesting microbes. Unlike traditional high-rate trickle towers, our media is not packed. Media is held under tension (supported at the top and bottom of the reactor vessel), thereby keeping colonies of BioFilm separated and enveloped in atmospheric gas. There is no bridging of media or short-circuiting, and waste-digesting microbes are always exposed to oxygen or other gas. Tensioned separation of media causes solids to pass through the system and provides channels for controlled natural sloughing.

 

Various Configurations of bioFAS™ MBBR Systems

 

Single-stage bioFAS™ SAGR Bioreactor followed by a post-DAF unit

 

  • Up to 90% BOD Reduction on a single-pass
  • Continuous wasting of biosolids
     

 

Two-stage bioFAS™ SAGR Bioreactor process preceded and followed by a DAF unit

  • Pre-DAF for TSS and FOG removal
  • Greater than 90% BOD Reduction on a single-pass
  • Continuous wasting of biosolids

 

Main Components of the bioFAS™ SAGR Systems

  • bioFAS™ Looped Cord Media (LCM)– Provides surface area for the acclimation and growth of bacteria. Our patented LCM has an effective life of 15+ years.
  • bioFAS™ Aeration Grids – 304SS or 316SS coarse bubble aeration grid for diffusion of air into the bioreactor

Ancillary Components

  • DAF Systems – Provided for the removal of FOG, TSS and biosolids and concentration "thickening" of the sludge to 4-6% w/w
  • Blowers – Positive displacement blowers for delivery of air to the MBBR bioreactors. Typically, the blowers are variable speed driven to save power costs and control dissolved oxygen levels in the bioreactors.
  • DO Sensors – Provided to monitor and automatically control the DO concentration in the bioFAS™ MBBR bioreactors and automatically adjust air volumes and blower speed to optimize the process and save power
  • Foam abatement Systems – provided to arrest foaming conditions that may periodically occur within the bioFAS™ MBBR bioreactors.
  • Chemical Addition Systems – Provides flow paced nutrient dosing (nitrogen and phosphorous) for maintaining a healthy biological culture. Alkalinity addition is provided for nitrification processes.