Odorous components can be removed from an air stream by condensing water vapour present in the air stream and subsequent absorption of these odorous components in the condenser.
The Odour Condensation Cooling (OCC) system is based on the principle that gaseous components tend to establish equilibrium between its concentrations in the -as phase and water. In the OCC heat exchanger the air is cooled to below the water dew point. As a result a layer of condensed water will be present on the heat exchanging area and most important this layer is renewed continuously by the ongoing process of water condensation. Consequently the equilibrium cannot be established and transfer from gas phase to water proceeds. In other words the so-called back pressure of the polluting gaseous component is minimised.
Applied for the cooling of process air at various composting plants the OCC also appears to be able to remove approximately 50% of the ammonia. If an efficiency of 80% is required, e.g. to meet the requirements for a biofilter, there is no need for a separate acid scrubber. The scrubbing effect can be integrated in the OCC, the so-called OCC-plus concept. The condensed water vapour is circulated and slightly acidified.
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