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.

  The aim of this study was to assess the cost of not regulating odour emissions. For that we have specified a domain in the Spanish region of Euskadi situated in the North of Spain. To perform this analysis, two factors have been considered: 1) The decrease in the property value affected by odour impact and 2) The economic impact on public health.

   To assess the cost of depreciation of odour-affected properties, a list of Activities Potentially Generating Odour Impact (APGOIs) was selected in the Basque Country. With this data, buffers were generated for different areas of odour nuisance, classifying them as serious, moderate and slight. Subsequently, the number of properties with the potential to be affected by odour impact was calculated. This analysis took into account the price per m2 of each municipality in Euskadi. The results showed that the total cost of depreciation of the value of the properties affected by odour impact was 778 and 1164 million euros for areas affected by serious and moderate odour impact, respectively.


Gonzalez  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.

   Additionally, the influence of the pollutant load was tested. Overall, toluene and pinene REs were high (<90%), while hexane and trichloroethylene did not achieve satisfactory REs (<30%). A high-water content in the latex-biofilm mixture was proven to increase the abatement, especially when provided as nutrient solution.

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