Highly effective, field-proven system for helping control hydrogen sulfide (H2S) emissions from municipal waster water treatment plants is now available from PureAire Monitoring Systems. Designed for use in 100% condensing RH environments, the PureAire Chlorine Monitor responds almost instantaneously to changes in chlorine concentration, making it ideal for controlling the addition of H2S oxidizers such as sodium hypo chloride in both mist-type and packed-bed scrubber systems. It is available in four different measurement ranges: 0 to 1 ppm, 0 to 3 ppm, and 0 to 10 ppm.

The system operates on the principle that as long as Cl2 is present in the scrubber, any H2S entering the system will be oxidized. As the H2S load increases, the resulting decrease in residual chlorine levels is detected and a signal sent to a companion controller to increase the rate of chemical injection/addition. Conversely, when the H2S load subsides and the measured chlorine level increases, the controller decreases chemical injection/addition. The PureAire Chlorine Monitor consists of a renewable, electrochemical sensor and companion transmitter, which may be linked to user-supplied programmable logic controller. The system has proven effective in helping eliminate H2S emissions and reduce chemical consumption in municipal waster treatment plants in Virginia, Florida, Arizona, and other states.

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