engleski

Zeolite and potting soil sorption of CO2 and NH3 evolved during co-composting of grape and tobacco waste

Composting is a biological treatment in which aerobic mesophilic and thermophilic microorganisms transform the biodegradable organic matter into CO2 and H2O, as well as into more stable organic matter. Two major gaseous byproducts of microbial transformation during biodegradation of grape and tobacco solid waste are carbon dioxide (CO2) and ammonia (NH3). As is well known that CO2 is the greenhouse gas and NH3 is a toxic and corrosive air pollutant. Therefore, it is important that studies be carried out to find ways to efficiently control the emission of these gases. The purpose of this work was to investigate sorption of gases, carbon dioxide and ammonia, on zeolite and potting soil during composting of solids waste. Composting process was carried out with forced aeration (0.645 L min-1 kgVS-1) in column reactor (10 L) under adiabatic conditions during 21 days. During the process temperature changes in the reactor, mesophilic and thermophilic microorganisms, pH value, C/N ratio and concentration of NH4-N, NO3-N and NO2-N in the composting mass, COD of condensate were monitored while evolved CO2 and NH3 were analyzed. The results showed that zeolite and potting soil are good adsorbents for sorption of CO2 and NH3. The emission of carbon dioxide is in correlation with the temperature in the reactor and it was found that the highest CO2 concentrations were measured in thermophilic stage during intensive biodegradation process. The concentration of ammonia in exhaust gas increased after 12 days of composting, when the pH in composting mass increased to 9.

composting of grape and tobacco waste ; carbon dioxide and ammonia emission ; sorption ; zeolite ; potting soil ; adiabatic reactor

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