Cheese & yogurt facility 



Technology: CDOX 

Application: pH Adjustment of Industrial Wastewater  

Location: Utah 

Goals: Precise pH Adjustment | Use of Process Water as Carrier Stream 



This brief memo will provide a snapshot of data and information from BlueInGreen’s recent CDOX® installation at the wastewater treatment plant of a cheese and yogurt manufacturing facility in Utah.

The project involved installation of a side stream carbon dioxide (CO2) delivery system for the purpose of pH control of process water in an equalization (EQ) basin. Mineral acids were used for pH control at this facility in the past but their use was discontinued due to safety and handling issues. Facility owners desired a more cost effective and safer solution that would provide automatic control over process pH levels.

BlueInGreen’s CDOX® technology was sought out for its highly efficient process of automatic pH control and its ability to utilize process water as the carrier stream. BlueInGreen’s proprietary process makes it possible to deliver large quantities of gas in very small quantities of water – as much as 10 times less than the closest competitor. Because BlueInGreen provides a fully- integrated, skid-mounted system, the unit was installed by plant staff with relatively little effort, as shown below. 

Figure 1.

Figure 1.



Figure 2 shows the location of the CDOX® system, CO2 storage, and EQ basin in which pH adjustment is performed. Process water from the food processing facility is collected in a wet well on the left side of the building. It is pumped from there into the EQ basin before being pumped to the facility’s activated sludge basins. The average daily flow to the facility’s wastewater plant is 250,000 gallons. Due to the regular use of cleaning chemicals which are primarily caustic, the process water has a typical pH of 11-12 SU. pH values this high are detrimental to the microbial activity in the facility’s activated sludge process and therefore make it difficult to meet discharge permit requirements.



After start-up and tuning of the CDOX® system, the EQ basin effluent pH was brought under control in a pH range more conducive to microbial activity as can be seen in Figure 3 to the right. It is clear from this information that the CDOX® is very effective at controlling pH within a tight range – automatically making adjustments for changes in water quality and flow rates. 

Figure 2.

Figure 2.

Figure 3.

Figure 3.


In conclusion, BlueInGreen’s CDOX® technology demonstrated effective pH control with fast response to influent water quality and quantity changes. The process is highly efficient, having excellent mass transfer capabilities and near 100% utilization of vaporized gas. Combined with a fully-integrated control scheme that is unmatched in the industry, the CDOX® excels at carbon dioxide delivery.