BBF Biofiltration


Tomorrow Water’s BBF BioFiltration platform is an advanced wastewater treatment technology that combines biological treatment and physical filtration in a single reactor.

With over 50 references worldwide, Tomorrow Water’s BBF BioFiltration system is a versatile, innovative, and proven technology.


The BBF biofiltration system can be used for primary, secondary, and tertiary treatment. By combining physical filtration and biological treatment, BBF applications range from large scale municipal wastewater treatment to high strength livestock wastewater.

  • Primary & Combined Sewer Overflows (CSO) Treatment

  • Physical and Biological Filtration

  • Secondary and Tertiary treatment for Nitrogen Removal

  • Municipal, Industrial and Groundwater Treatment

  • Concrete and Steel Vessel


Generally, biofiltration technology is used for secondary and tertiary treatment.

Tomorrow Water has continuously expanded the application of BBF to primary & wet weather flow treatment through upgrading our key components such as media and strainer blocks. Additionally, BBF can treat groundwater through strengthening of biological function of BBF.

  • Special Media Maximizing Surface and Porosity

  • Specialized Strainer Block and Nozzel

  • Conventional (BNR) and Advanced (Anammox) Nitrogen Removal 


With over 50 references worldwide, the BBF BioFiltration system comprises a range of proven and versatile solutions optimized for the treatment of municipal wastewater, groundwater, and high-strength industrial wastewater.


Previously certified for compliance with CA Title 22 water reuse regulations, BBF is not only suitable for the upgrading and retrofitting of existing wastewater treatment plants, but also for integration into new wastewater reuse facilities. Recognized by WERF’s LIFT Program as a substitute for the primary clarifier, BBF can also remove solids and soluble organics for carbon diversion and to control wet weather flow.

  • More than 50 references

  • Large scale experience(upto 190 MGD)

  • California Title 22 : Water Reuse


How Bio-filtration Works

  1. Larger size particles are pre-filtered by the fixed media layer at the bottom of the reactor (A)

  2. Suspended solid and fine particles are filtered by the bio-film attached on the floating media (B)

  3. Organic matter and nitrogen are also removed by the microbes that form the bio-film (C)



BBF Structure


Physical & Biological Treatments Using a Single Up-flow Reactor

  • Wastewater travels down from the influent water way located on top of the BBF reactor, and it enters the reactor at the bottom of the structure

  • The hydraulic head difference creates an up-flow condition inside of the reactor and water first travels through the fixed media layer (anoxic zone) which is located at the bottom of the system

  • Floating media layer is located in the middle of the reactor and is retained by strainer block

  • Depending on the process air diffusers location relative to the floating media, oxic, anoxic, or oxic/anoxic conditions can be designed

  • The effluent waterway conveys treated water from the system and the remaining water on top of floating media is used as backwash water source without requiring pump


Concrete Type

  • Rectangular concrete structures

  • For large volume flow

  • Above ground or underground design

Above Ground BBF

Underground BBF


Above Ground

1. Influent Waterway

2. Influent Pipe

3. Fixed Media

4. Floating Media

5. Strainer & Block

6. Treated Water for Backwashing


7. Effluent Waterway

8. Backwashing Channel

9. Main Air Pipe

10. Process Air Pipe

11. Backwashing Air Pipe

12. Maintenance Walkway


Vessel Type

  • Cylindrical vessels (dual or quad unit)

  • For small volume flow

  • Outdoor or indoor installation

  1. Distribution Box

  2. Influent Pipe

  3. Fixed Media

  4. Floating Media

  5. Strainer

  6. Treated Water for Backwashing




BBF Key Components



  • The uniform sized fixed media material is made from ceramic materials and is available with 5~20 mm diameter

  • The floating media is an expanded poly propylene (EPP) material which provides the ideal surface area to build bio-film

Media Material Size Density
Fixed Ceramic 0.2"~0.8" >93.6 lb/ft3
Floating EPP 0.08"~0.3" >6.24 lb/ft3

Original Floating Media (Spherical)

New Floating Media (Cross-Shaped)


Air Supply System

  • Consists of air diffusers and air supplier

  • Supplies air to create oxic zone in floating media

  • Provides air supply to scour excess biomass deposits off of the media surface

Strainer Block

  • Prevents loss of the floating and/or fixed media

  • Maintains uniform discharge flow

  • Air in the floating media escapes through the nozzles attached under the strainer block

  • The uniform sized fixed media material is made from ceramic materials and is available with 5~20 mm diameter

  • The floating media is an expanded poly propylene (EPP) material which provides the ideal surface area to build bio-film


Do You Trust The Media?


Tomorrow Water’s patented expanded polypropylene (EPP) media design boasts the highest solids loading rate of any biofiltration process in the world.


Primary Filtration

  • Unique, cross-shaped media maximizes void ratio

  • High solids loading rate

  • Minimizes head loss

  • Easy backwashing, low attrition (3%)

Secondary & Tertiary Biofiltration

  • Simultaneous oxidation/N/DN PLUS filtration

  • Spherical media for max SS removal



BBF Operation


Operation Mode

  • Influent enters the BBF reactor from the top through the influent pipe and by gravity reaches the bottom and then flows upward through both media layers

  • Larger particles are filtered by the fixed media and the smaller particles, soluble pollutants and nutrients that pass through the fixed media layer are removed in the floating media’s biofilm

  • The treated water exits the reactor through the effluent waterway on top of the reactor

  • As the up-flow treatment process continues, headloss will be increased by the excess solid deposits

Backwashing Mode

  • Head loss is recovered by two backwash methods, gravity draining for sludge removal(fixed media) and air scouring for excess bio-mass removal (floating media)

  • Monitoring system (pressure gauge) triggers automatic backwash

  • During backwashing, the air scouring facilitates the removal of suspended solid and excess biomass from the media layer

  • Backwashing sludge drains through the backwashing channel

  • The treated water remaining over the upper strainer block will be used for backwashing driven by gravity


BBF Reference Sites


Primary Treatment & Wet Weather Flow

Secondary Treatment

  • Jungrang STP, Seoul, South Korea - 66 MGD

  • Jingun, Namyangju, South Korea - 6.6 MGD

  • Okjung STP, Yangju, South Korea - 5.8 MGD

  • Yangbul STP, Gwangju, South Korea- 5.3 MGD

  • Gumi Hwacjangdanji STP, Gumi, South Korea - 3.8 MGD

  • Samri STP, Gwangju, South Korea - 1.3 MGD

  • Julpo STP, Buan, South Korea - 0.4 MGD

  • Dangjin STP, Dangjin, South Korea- 7.9MGD

Tertiary Treatment

  • Eunyang STP, Ulsan, South Korea - 15.9 MGD

  • Osan 1st STP, Osan, South Korea - 15.1 MGD

  • Bookhang STP, Mokpo, South Korea - 9.2 MGD

  • Boryeong STP, Boryeng, South Korea - 7.9 MGD

  • Gwangju STP, Gwangju, South Korea - 6.6 MGD

  • Jeungpyeong STP, Jeungpyeng, South Korea - 6.6 MGD

  • Pocheon STP, Pocheon, South Korea - 6.3 MGD

  • Chungbuk Innovation city STP, South Korea - 4.0 MGD

  • Ohpo STP, Gwangju, South Korea - 3.7 MGD

  • Daejuk WWTP, Seosan, South Korea - 3.2 MGD

  • Dochuck STP, Gwangju, South Korea - 1.1 MGD

  • Bukang STP, Saejong, South Korea - 0.8 MGD

  • Qufu STP, Sandong Province, China - 10.6 MGD - Reuse

  • Dangjin STP, Dangjin, South Korea - 3.4 MGD - Reuse

  • Magok STP, Seoul, South Korea - 5.3 MGD - Reuse

  • Songdo STP, Inchon, SouthKorea - 5.3 MGD - Reuse

RO Concentration Treatment 

High Concentration Nitrogen Treatment

  • Seobu LWTP, Jeju, South Korea - 0.05 MGD - Dual Media

  • Dangjin LWTP & other 23 site - 0.06 MGD - Dual Media

Groundwater Remediation

  • City of Barstow, California, USA - 500GPM - Drinking Water





Member Login
Welcome, (First Name)!

Forgot? Show
Log In
Enter Member Area
My Profile Not a member? Sign up. Log Out