Most WWTPs utilize recovered gas to fuel boilers and flare off the excess. Other biogas uses include fuel for combustion engines to generate electricity, fuel for natural gas vehicles, and sale and distribution to neighbouring industries and communities.
ADG is a wet, dirty gas, often containing trace levels of contaminates such as hydrogen sulfides and volatile siloxanes, which may condense and accumulate on pipe walls or equipment inside of the pipe. Selecting a flow meter with no moving parts can dramatically reduce costs associated with maintenance and repair.
Most digester gas applications operate at relatively low pressure. Fox Flow Meters create virtually no pressure drop and can be used to accurately measure these flow rates. They are widely used in WWTPs to optimize digester processes, comply with environmental regulations (40 CFR Part 98 Subpart II) and control fuel and air flow ratios in combustion processes.
Aeration Systems in Wastewater Treatment
In wastewater aeration, one of the most important factors for proper treatment is the determination of how much air volume in standard cubic feet per minute (SCFM) will be needed to deliver the mass of air required for optimal bacterial biodegradation of organic matter.
The oxygen transfer efficiency of aeration systems in wastewater treatment is the ratio of dissolved oxygen to the total amount of air fed into the system. Oxygen that is not dissolved in the wastewater is lost and the biodegradation process is compromised. In order to avoid this, the flow of oxygen fed into the system must be monitored and then compared to water sample data to find oxygen transfer inefficiencies.
Sludge disposal regulations, EPA values for oxygen transfer, and growing disposal site scarcity are all motivating factors for improving aeration systems by locating and eliminating inefficiencies. Fox Meters can accurately measure air or oxygen flow rates in aeration systems to help solve inefficiency problems.
Applications
