Characterization of the Gaseous and Odour Emissions from the Composting of Conventional Sewage Sludge

Atmosphere

Joan Colón¹  Nagore Guerra¹  Sergio Ponsá¹  Antoni Sánchez²  Daniel González²  David Gabriel³ 

[1] BETA Technology Centre: “U Science Tech”, Univeristy of Vic-Central University of Catalonia, 08500 Vic, Spain;Composting Research Group (GICOM), Department of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;Group of Biological Treatment of Liquid and Gaseous Effluents (GENOCOV), Department of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;

关键词: sewage sludge;    composting;    gaseous emission;    greenhouse gases (ghg);    odour;    vocs;   

DOI  :  10.3390/atmos11020211

来源: DOAJ

【 摘 要 】

Many different alternatives exist to manage and treat sewage sludge, all with the common drawback of causing environmental and odour impacts. The main objective of this work is to present a full inventory of the gaseous and odorous emissions generated during the bench-scale composting of conventional sewage sludge, aiming at assessing the process performance and providing global valuable information of the different gaseous emission patterns and emission factors found for greenhouse gases (GHG) and odorant pollutants during the conventional sewage sludge composting process. The main process parameters evaluated were the temperature of the material, specific airflow, average oxygen uptake rate (OUR), and final dynamic respiration index (DRI), resulting in a proper performance of the sewage sludge composting process and obtaining the expected final product. The obtained material was properly stabilized, presenting a final DRI of 1.2 ± 0.2 g O₂·h⁻¹·kg⁻¹ Volatile Solids (VS). GHGs emission factor, in terms of kg CO_2eq·Mg⁻¹ dry matter of sewage sludge (DM−SS), was found to be 2.30 × 10². On the other hand, the sewage sludge composting odour emission factor (OEF) was 2.68 × 10⁷ou·Mg⁻¹ DM−SS. Finally, the most abundant volatile organic compounds (VOC) species found in the composting gaseous emissions were terpenes, sulphur compounds, ketones, and aromatic hydrocarbons, whereas the major odour contributors identified were dimethyldisulphide, eucalyptol, and α-pinene.

【 授权许可】

Unknown