BioAir Pilot Project

Overview
BioAir’s mission was to develop a new synthetic media that would far exceed the current industry standard requirements of 90% removal of overall odor and 99% removal of hydrogen sulfide. We set the bar high: our goals for performance were greater than 95% removal of overall odors and greater than 99.9% removal of hydrogen sulfide, without the use of adsorbents.

BioAir undertook an unprecedented pilot study to complete media development prior to its introduction to the marketplace, rather than bring an experimental media to market and continue to refine it.

The Pilot System
BioAir’s pilot test in Jacksonville, Florida, led to the development of our breakthrough proprietary EcoBase media and provides for continuing improvement to our odor control offerings and performance standards.

The full-scale pilot test system consists of five EcoFilter EF51 reactors, each with its own blower, water and electrical control system. Our goal was to gain a better understanding of the mechanisms of mass-transfer and bacterial oxidation of odorous compounds, the interface between the bacteria and their food source (organic and inorganic compounds – odors), and the effects of varying the process parameters on microbial population and activity. This enabled us to optimize media characteristics and process control, resulting in maximized odor removal performance and minimized treatment time, footprint and cost.

Key Objectives
Our pilot study enabled us to meet two key objectives:

Mass transfer optimization – This is achieved by custom engineering air flow paths through the media to control the level of turbulence inside the media. To determine the optimum design, we developed and tested five different engineered medias in the pilot system, measuring the mass transfer coefficients of each media.

Optimization of bacterial degradation of organic and inorganic odorous compounds – This is achieved by gaining an understanding of the internal ecosystem of the reactor, the balance of variables and the resulting effect of process changes and controls. Through the extensive piloting and data analysis conducted by BioAir and our team of scientists, we have been able to isolate the functions critical to optimization. The result: greatly improved performance.

Performance Results
Hydrogen Sulfide Removal
– The hydrogen sulfide (H2S) concentration in the untreated inlet and treated outlet air streams from the EcoFilters are continuously measured with pre-calibrated Odalog gas data loggers. The inlet air H2S is measured with 0 – 1000 ppmv Odalogs, and the exhaust air with 0 – 50 ppmv Odalogs. The outlet air H2S concentration is verified weekly with 0 – 2 ppmv Odalogs.

Evaluation of the H2S data shows that the EcoFilter EF51 system consistently removed more than 99.8% of the H2S, with inlet air concentrations varying between 10 and 200 ppmv. The reactor residence time was 9.8 s.

Odor Removal – Odor samples were collected from the inlet to, and outlet from, the EcoFilter reactors in 10L tedlar bags and analyzed by St. Criox Sensory using ASTM 679-91 methodology. The results from the odor tests showed that the EcoFilter reduced the odors by 95%, i.e. from a Detection Threshold concentration of 16,000 OU to 820 OU at a residence time of 9.8 s.

Our research is ongoing and more results will be provided as they become
available. Please continue to check back to learn more about the great
performance of our EcoFilter systems.