Current Methods for Degassing
The most common method for degassing hydrogen sulfide from drinking water is using tray aerators, which contact ambient air with the water. There are several issues with using tray aerators:
- Low removal efficiency of hydrogen sulfide, mainly due to poor contact between the water and the natural draft of ambient air;
- Exposure of drinking water to ambient air, which contains air pollutants, such as soot, chemicals, engine exhaust fumes, dust, bacteria, etc.;
- Negative removal efficiency of hydrogen sulfide, since growth of sulfate reducing bacteria (SRBs) on the trays can actually increase the hydrogen sulfide in the water, instead of reducing it; this was actually measured, as detailed in the testing described below;
- Lack of security of drinking water systems; tray aerators make the entire drinking water system vulnerable to terrorist-based poisoning of drinking water, since these aerators are usually accessible by staircase, alongside the water storage tank;
- Hydrogen sulfide removed by the ambient air can cause odor issues in the surrounding homes and result in corrosion of tanks, handrails, etc.