Municipal Wastewater


A Clean & Beautiful World Beyond Waste

For 20 years, Tomorrow Water solely focused on efficiently treating wastewater. However, wastewater itself is no longer waste but a valuable resource for the sustainable society. Seeking to lead this new paradigm, Tomorrow Water has devoted years to technological innovation in an endeavor to transform wastewater “from cost stream to profit stream”.

Our technologies are developed to:

  • Comply with stringent discharge regulations

  • Reuse or recycle wastewater

  • Save & produce energy

  • Create New & Retrofit current facilities

The versatility of our technologies and processes provide the following solutions for the wastewater treatment cycle:


Municipal Wastewater

Primary Treatment


Proteus (BBF Primary) has a 65-80% smaller footprint than primary clarifiers


At Tomorrow Water’s 66MGD flagship plant at the Jungnang Treatment Facility in Seoul, South Korea, the footprints shrank for primary treatment by 80%, and the entire treatment process by 64% after the installation of the BBF process.

Using Proteus (BBF Primary), we can retrofit your old conventional primary clarifiers to save space, increase capacity and upgrade your process.

Carbon Diversion by Proteus (BBF Primary)
Less Aeration, More Biogas!

Grab more solids upstream of aeration basins and send them to digestors for maximum energy efficiency.

Finding ways to increase energy savings and energy recovery is a leading trend in the WWT industry. Carbon, originally used in nutrient removal as an electron donor, is now acknowledged as an important energy source. Current primary treatments can effectively remove solid organic, but not soluble organic materials. Soluble carbon removal is one of the most critical problems facing advanced biological treatment technologies today.

⇧ 20-30% INCREASE
in Gas Production

⇧ 10-25% INCREASE
in Secondary Treatment Capacity

⇩ 10-25% REDUCTION
in Aeration Energy


Proteus (BBF Primary)
LIFT Program Participant

Solving Carbon Diversion Challenges with Primary TSS Capture

Proteus (BBF Primary) is a high rate up- flow filtration system that can manage higher levels of BOD and SS during the wet season. Accepted into the general technology scan of the LIFT program based on innovative capacity for carbon diversion, BBF facilitates the effective removal of solids and soluble organics by simultaneously performing biological treatment and physical filtration. This inherent dual functionality enables BBF to be a robust technology platform capable of combining Anammox and/or Algae solutions with wet weather flow treatment.

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Municipal Wastewater

Secondary Treatment


Secondary treatment focuses on biological carbon and nutrient removal from wastewater to comply with the effluent discharge limit.

The secondary treatment process must meet increasingly stringent current and future water quality standards.

Selection of sewage treatment process is affected by discharge standards, raw wastewater quality, and local (site) constraints. Tomorrow Water does not provide a simple unit technology but a well-balanced process after considering the various constraints of the site and the needs of clients. 

In particular, existing treatment plants need to be retrofitted efficiently and economically in order to comply with the increasingly demanding water quality standards. 

  • Small footprint due to short HRT

  • No primary or secondary sedimentation basin necessary

  • No tertiary filtration required

  • Easily responds to hydraulic load fluctuations


Biological and Physical Treatment in One Reactor

The BBF process is an upflow biological filtration process utilizing specially designed floating EPP filter media. The patented EPP media has unique shape that optimizes the pore size to secure high concentrations of microorganisms, so that nitrogen and organic removal rate is high. Since biological treatment and physical filtration are carried out at the same time, the treated water quality is excellent even without a separate sedimentation tank.

Nitrification and Denitrification in one reactor

Nitrification, denitrification, nitrification/denitrification can be performed depending upon the method and location of the air supply. Thus, various process configurations can be achieved. When combined with existing treatment plants lacking HRT, BBF will perform nitrification while the existing treatment plant performs denitrification and removal of phosphorus.

Since the BBF process is a submerged attached growth process, it is suitable for sewage with relatively low concentration and high fluctuating flow rate. It is possible to construct a compact structure when the existing plant has limited space for expansions. BBF can perform stable nitrification even at low temperature, making it a suitable process for areas where there is concern for decreased efficiency due to cold temperatures.

Secondary for New Facilities

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Tomorrow Water’s BBF Bio-filtration system has been approved by the California State Water Resources Control Board as an alternative filtration technology for achieving the minimum turbidity level required under Title 22 of the California Water Recycling Criteria. 


Municipal Wastewater

Tertiary Treatment


A vast majority of wastewater treatment facilities in the United States, most of which were built decades ago, are not able to meet low nitrogen discharge limits. Pollution resulting from the operation of these plants has therefore led to severe environmental problems. The limitations of these existing facilities present a serious technological hindrance for water reuse applications requiring nitrogen removal, including groundwater replenishment.

Proven to function effectively in filtration, BBF is capable of simultaneously removing nitrogen while occupying equal or less space compared to traditional tertiary filtration options such as sand filters. This compact footprint makes BBF an ideal choice for retrofitting outdated wastewater facilities looking to update their technology with nitrogen removal processes under space limitations.

Treated wastewater is easily accessible and can be stable in quality and quantity, making it a high value alternative water resource. In order to reuse treated wastewater, removal of nitrogen and solids is an essential step before advanced wastewater treatment process. 

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BBF Benefits for Tertiary Treatment

  • Further treat the nitrogen from secondary treated water

  • Can be operated under various water quality conditions and can ensures stable water quality through its filtration function (Turbidity <2 NTU)

Video: This artificial lake is fed by reused municipal wastewater treated using tertiary BBF technology in Incheon, South Korea.


Retrofit Your Facilities,
Find Hidden Space


Retrofit & Repurpose

Through it’s versatile design and small footprint, BBF Biofiltration can help reclaim space in your facility. With the ability to build under- or over-ground, BBF BioFiltration can retrofit your existing clarifiers to repurpose land for additional treatment processes, or to provide space to build new facilities, such as administrative offices, parking, or public spaces.

At Jungnang, the BBF BioFiltration system is built and beautifully disguised under a public park and museum, with the treated wastewater discharging directly into the Han River.  


Handle Higher Flows During the Wet Season


The BBF Biofiltration system can also be used to treat wet weather flows to primary or secondary standards. With continuous aeration capabilities and no settling required, the system can manage high peaking factors and variable flow rates, simplifying the treatment of dilute flows.


Municipal Wastewater

Wet Weather Flow


During the wet season, the influent wastewater flow to treatment plants increases significantly. It has been observed that the water quality of influent during the wet season was high in both BOD and Suspended Solids (SS) concentration. The municipal wastewater treatment plants were not able to handle the additional flow conditions and could not help but bypass the wet weather flow, thereby seriously contaminating water body.

BBF’s high-rate up-flow filtration system can handle significant influent wastewater flow and higher levels of BOD and Suspended Solids (SS) during the wet season.

Through carbon diversion, BBF facilitates the effective removal of solids and soluble organics by performing biological treatment and physical filtration simultaneously. The dual functionality and robustness of the BBF platform enables it to be further enhanced with our Anammox and algae solutions for wet weather flow treatment.

  • Combine filtration with biological treatment

  • Can be enhanced with chemical carbon capture

  • Small footprint due to short HRT

  • Implemented and proven at scales of up to 132 MGD

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 Municipal Wastewater

Sidestream Treatment


At typical wastewater treatment plants, sidestreams are generated from the solid/liquid separation processes (e.g., thickening, dewatering processes). Separated liquid possesses high nutrients and is recycled back to the plant headworks, which impacts mainstream processes. It is reported that the sidestream could constitute ca. 15~25% of the total influent nitrogen load.

BKT's AMX will provide the most economical solution for sidestream nitrogen removal.

Towards a new era of resource recovery from wastewater, sidestream has become a valuable resource to harvest energy and nutrient. Anaerobic digestion is the center of the resource recovery from the sidestream. Maximizing energy harvest & sludge dewaterability and minimizing waste sludge volume would be the key goals for the sidestream.

Pretreatment of anaerobic digestion using BKT's Cyclic Organic Waste Treatment (COWT) would be the perfect solution to enhance sludge dewaterability, the bio-gas production at the anaerobic digestion.

Related Technologies


 Municipal Wastewater

Energy Solutions


Maximize Energy Savings & Production with Well-balanced Processes


Enormous amount of energy is needed to treat  the sewage (electricity consumed in the water and wastewater treatment plant accounts for 2-4% of the total electricity consumption in the United States). Paradoxically, there are diverse energy sources in the sewage. Therefore, when designing or operating a sewage treatment plant, it is necessary to consider ways to minimize  energy consumption and maximize energy recovery.

Tomorrow Water’s Solution

BKT offers energy efficient Turbo Blower to save electricity used for aeration which accounts for 30-50% of the electricity consumption in the sewage treatment plant. BKT also offers the Energy Optimization System (EOS) to operate the sewage plant efficiently. EOS can predict, control and optimize the aeration and other operation parameters of the sewage plant based on the Big Data of the past influent wastewater characteristics. With Big Data, the EOS system can grasp income sewage in advance and supplies air according to the inflow load.

The sludge from the sewage treatment plant  can be used to generate methane through anaerobic digestion, but it takes a long period of time to decompose and is difficult to decompose biologically in some cases. BKT uses COWT, a thermal hydrolysis technology,  as a pretreatment process for anaerobic digestion  to maximize  methane production by increasing the biodegradability of the solids. Through a well-balanced process design, increase in methane production can be achieved while overcoming the negative effects of the byproduct from thermal hydrolysis process. 

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