Pasteurization Technology Group

Jun 17, 2019

Pasteurization Technology Group (PTG) applies cogeneration principals to the problem of disinfecting wastewater using a process that is safe, toxic free, and has a low carbon footprint. First off, PTG’s systems generate low-cost electricity to save energy costs by tapping available biogas, natural gas, or both. Secondly, the systems channel exhaust heat to disinfect wastewater to meet California’s Title 22 recycling water standards at no additional cost, saving operating and maintenance expenses, such as chemical purchases, power consumption, labor, and consumables. The combined cost savings generate a positive cash flow stream that rapidly pays for the system capital cost.

PTG’s 350-gallon per minute full-scale demonstration unit at the Ventura Water Reclamation Facility in Ventura, CA.

What are the benefits to implementing your technology?

PTG’s systems increase efficiencies in wastewater treatment processes, lower associated carbon footprint, and eliminate harmful chemicals. Taken together, these outcomes lower economic costs, increase opportunities for water reuse, and support cleaner, safer environments. In particular, our technology:

  • Reduces dependence on high cost grid-based electric power – wastewater treatment plants can use onsite biogas or low-cost natural gas to generate electricity at a lower cost compared with purchasing grid-based power from a third-party provider.
  • Channels exhaust heat from onsite electric generation to disinfect wastewater at no additional cost – this eliminates operating and maintenance costs traditionally incurred for disinfection, such as chemical purchases for chlorine-based systems, electric power consumed in ultra-violet and ozone processes; this also reduces associated labor costs and consumables such as replacement parts.
  • Increases electric reliability – the chances of power outages are lowered by adding site-owned and controlled electric generating resources while maintaining access to existing third-party controlled resources from the electric grid.
  •  Employs a patented process that makes wastewater disinfection energy efficient – basically, thermal energy embedded in disinfected wastewater is recycled over and over in PTG’s efficient patented process. Combined with the use of either onsite biogas or clean burning natural gas, the technology will help lower carbon footprint and emissions.
  • Takes advantage of heat-based disinfection ultimate efficacy – sufficient levels of heat applied to wastewater through the process of pasteurization has been proven to eliminate virtually all harmful micro-organisms, including pathogens that may survive other disinfection methods. Basically, applying the principals of pasteurization – that is, by heating wastewater to appropriate temperatures – will result in sterile water.
  • Produces California Title 22 recycled water – water treated in PTG’s disinfection system can be made immediately available for non-potable reuse.
  • Allows for the elimination or significant reduction of harmful chemicals in many situations – which will make the workplace environment safer and, in the cases of discharge, will reduce water contamination and pollution.

Has the technology been tested, demonstrated, or implemented anywhere to date?

PTG’s commercial disinfection system capable of treating more than 500,000 gallons per day at Graton Community Services District in Sonoma County, CA.

Yes, PTG’s systems have been piloted at several municipal wastewater treatment facilities, and PTG has completed its first commercial system sale.

For two years, covering late 2011 through 2013, PTG’s 350-gallon per minute full-scale demonstration unit was successfully operated 24 hours/day and 7 days/week at the Ventura Water Reclamation Facility in Ventura, CA. This project involved Carollo Engineers who prepared reports and presented case studies on the results. This same pilot unit was operated from March 2015 through November 2015 for the Australian Water Recycling Centre of Excellence Project: Pasteurization for the Production of Class A Water project at Melbourne Water’s Western Treatment Plant in Melbourne, Australia. Reporting on this pilot study was completed in 2016.

From July 2015 through March 2016, PTG’s 20-gallon per minute pilot system was included in the Ventura WaterPure Demonstration Facility Direct Potable Reuse project at the Ventura Water Reclamation Facility. In 2015, PTG commissioned its first commercial system at Graton Community Services District in Sonoma County, California. The system’s design capacity allows for treatment of more than 500,000 gallons per day.

What are some of the next steps needed to advance the technology?

Additional municipal wastewater treatment commercial sales and deployments, particularly for increasingly larger systems, is the most important goal, which will enable scaling up of the technology. As well, piloting on other direct potable reuse projects would help develop the best uses for PTG’s technology in these important applications which are just now beginning to gain traction. Finally, introduction of PTG’s disinfection technology in industrial and other locally distributed systems is an important future step, particularly to determine both optimal applications as well as the best matching of PTG’s technology with upstream industrial wastewater treatment processes developed by other companies.

How has LIFT helped, or how can LIFT help?

We were recently accepted into LIFT, and we are hoping to communicate directly with interested parties through the program. As a small company, PTG relies on networking in professional organizations such as WE&RF in order to meet people who we can help, and who can help us.