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Title: Use of Italian zeolites for purification and upgrading of biogas from organic municipal wastes and olive mill effluents, with the prospect of a re-entry into the national grid. Autors: Ettore Guerriero, Francesco Petracchini, Valerio Paolini, Alessandro Bencini, Serena Drigo, Ilaria Bientinesi. CNR - Institute of Atmospheric Pollution Research, Area della Ricerca di Roma1, Via Salaria Km 29,300 Monterotondo, (RM). AZZERO CO2 srl, via Genova 23, Roma (RM). Our research is part of the project BIO GAME, whose general target is to promote the market and the distribution of biomethane. The activity consists in the development, the validation and the optimization of a small-scale and economically sustainable biogas purification, through the experimental use of natural zeolites taken from processing wastes of Lazio’s tuffs. Regarding the production of biogas, the project focuses on the development of the organic fraction of municipal solid waste and olive mill effluents, stimulating a virtuous management of organic residues and taking advantage of their great potential energy. From previous experiments, conducted by the Institute for Atmospheric Pollution Research of the National Council of Researches (CNR IIA), it was observed that certain types of tuff can simultaneously sequester the CO2 and other contaminants present at low concentration, in addition to acting as a powerful dehydrating agent. The activity is to employ tuffs in the technique of pressure swing adsorption (PSA): in fact, synthetic zeolites (very expensive) have been used for the adsorption of CO2 in some plant solutions. Natural zeolites may be used both for the adsorption of carbon dioxide and for the abatement of hydrogen sulphide instead of coal, generally used for these purposes. Usually, the coal is regenerated: this results in a reduction of efficiency in abatement of siloxanes and other volatile organic compounds. Tuffs wastes are available in large amounts at low prices, so they allow the elimination of the regeneration phase. Furthermore, they are able to effectively adsorb ammonia: therefore, after having been enriched, they can be disposed on an agricultural land, increasing its productivity. Indeed, the use of tuff in soils is already a common practice, since it has an effect of slow release both of irrigation water and nitrogen fertilizer. The project allows to identify a new methodology for the management and energy recovery from organic wastes, and to develop the distributed production of biomethane. In this way it will be possible to increase the independence from centralized energy systems and from fossil fuels. Along with an increase in the security of energy supply, it will result in a reduction of greenhouse gases emissions and a strengthening of the competitiveness of Lazio’s and Italian oil industry, together with an employment growth. Read less