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Odour impact is generally low around Waste Water Treatment Plants (WWTP) when conventional Odour Control Unit (OCU) such as chemical scrubbers or biofilters are implemented. However, for some specific WWTP processes such as sludge thermal drying releasing odorous Volatile Organic Compounds (VOC) in particular aldehydes and ketones, these conventional OCU are not effective enough to avoid odour nuisances in the environment.
To fix this issue, we have proposed a simple and relevant two stages treatment line to treat odorous VOCs from WWTP. The first step of the treatment line consists of an enhanced water scrubber (absorption) and the second one, an Activated Carbon (AC) filter (adsorption). The enhanced water scrubber, patented by Suez and named AzurairTM Cool, uses a chiller to cool the inlet scrubber water in order to increase VOCs removal in scrubber and dehumidifie air before the second stage of AC filtration.
In this work, a new biotechnology based on latex biofilms was developed and tested for VOC abatement in the context of indoor air. Four VOCs – hexane, trichloroethylene, toluene and pinene – of different solubilities were selected as model pollutants. A mixed bacteria culture enriched from activated sludge was used as inoculum for the experiments. The removal efficiency (RE) of the pollutants was evaluated for different biofilm mixtures, which involved variations in the water content, the presence of water retainers, the latex pre-treatment, and the biomass concentration.