Last December, a new legislation in air quality came into force in Germany. This is, to our knowledge, the first general limit of odour in ambient air in any country of Europe as it applies to any activity that is potential odour pollutant and to all sectors.
That is, since the first of December 2021, Germany has a regulatory limit of 1 odour hour in ambient air that cannot be exceeded more than 876 hours a year in residential areas. Also, for industrial and rural areas, the limit of 1 odour hour cannot be exceeded more than 1314 hours every year.
The 4th and 5th of May 2022 will take place the next odour workshop on product and material testing organized by the German company Olfasense. This workshop has taken place regularly, and it is a reference event on issues related to the emission of odours from products and materials.
This workshop will be carried out at their new Olfasense laboratory facilities for sensory and molecular odour testing in Kiel, Germany. The program is not available yet, but mind that they limit the total number of participants to 50.
As you probably know, Olores.org organized the 9th IWA Odour & VOC/Air Emission Conference will take place the 26-27 of October 2021 in Bilbao, Spain. The IWA Odour and Air Emissions Conferences is one of the worldwide leading odour conferences. These events bring together engineers, scientists, researchers, students, local authorities, managers and other professionals in order to address and discuss emerging odour issues.
More than 160 people attended that event, from 19 different countries, and more than 50 presentations were shown there. Although this conference was held primarily in English, some of them are in Spanish, but you could read their abstract in English..
Saying that, we are very happy to share with you the articles of their presentations, and the videos and PPT files of the ones that have given us their authorization to publish them.
Nitrogen is used in agriculture to fertilise croplands. During the spreading of fertilisers, a substantial part of Nitrogen is lost by volatilisation of ammonia (NH3). These emissions are responsible for unpleasant odours but are also mainly precursors of particulate matters (PM). In Europe, agriculture is one of the main source of nitrogen-composed PM. There is a need to collect more emissions data to understand better this activity impact.
Measurement techniques of NH3, used for ambient air quality monitoring, are expensive and heavy to manage for the agricultural sector. Other techniques less expensive, like passive sampling, are also used to estimate ammonia flow, but these devices are not adapted for continuous monitoring. For this reason, we decided to customise a common e-nose device to detect ammonia emissions from fertilised grasslands. The sensor array was built using six commercial metal oxide semiconductor sensors. The sensors were inserted radially and evenly into a small size cylindrical PTFE chamber. Four of the selected sensors were sensitive to ammonia, one was sensitive to VOC and the last one was for combustible gas.
The proposed Advanced Biofiltration (mixed organic/inorganic) can be considered the Best Available Technology (BAT) to treat odorous emissions from MSW treatment plants, composting and WWTP plants among others, typically achieving final odour concentrations below 1000 uoE/m3 or 95% efficiency.
The applied sensorics includes the most relevant parameters (COVs, H2S, NH3). The integration of these parameters in the Airadvanced™ platform allows real-time monitoring of the correct functioning of the biofilter and thanks to the meteorological (WRF) and dispersion (CALPUFF) models allows the client to visualize the impact in real time and the prediction of impacts up to 72 hours.
The wastewater treatment plant (WWTP) of Torredembarra, located in the province of Tarragona, Spain, has suffered for years from noticeable odor emission problems, mostly during the summer season. During past years, the odor treatment in the WWTP relied on a series of biological and physico-chemical systems, which led to significant operating costs and which had fluctuating efficiency, mostly during summer season.
In order to mitigate these odor emission events, a comprehensive restructuring plan was developed for this whole treatment system. The emission rates of the main odorous compounds in all the critical points of the WWTP were assessed during different times of the year. The most relevant odour emission areas were then confined, and the headspace air treated in a series of new and retrofitted biotrickling filters.