Abstract
New approaches are of crucial importance to evaluate and minimize the odorous impact in the management of organic waste. The objective of this study is to develop an odor map to identify the highest critical odor points in an urban waste treatment plant from the physico-chemical, respirometric and olfactometric variables evaluated in different emission sources. Fresh organic waste such as sewage sludge (SL) and organic fraction of municipal solid waste (OFMSW) were found to be the most influential odorous substrates (14.57 and 2.41 ouE/s·m2, respectively), due to their high concentration in biodegradable organic matter. Compost derived from both fresh organic materials (C-SL and C-OFMSW) were the least influential substrates in terms of odor emission (≤0.1 ouE/s·m2) as a consequence of their stabilization. Inorganic waste (IW) showed an odor potential as high as 2.10 ouE/s·m2, similar to OFMSW, due to the organic material adhered to IW surface emits high amount of unpleasant odors. Leachate lagoons (LIX) were classified as middle critical emission points (0.7 ouE/s·m2), because of the high mineralization of nitrogen in the form of ammonical nitrogen. Moreover, the emission sources were clearly grouped according to their physico-chemical and respirometric characteristics by principal component analysis (PCA) and a value as high as 67.3% of the total variance was explained. Finally, odor emission was predicted from the physico-chemical and respirometric variables by multivariate regression, with respirometric variables (OD20 and SOUR), total Kjeldahl nitrogen (TKN), ammoniacal nitrogen (N-NH4+) and the residence time (t) being the most influential variables on the prediction correlation (r = 0.9768). SL and OFMSW contributed 60% and 15%, respectively, to the global odor emission derived from the treatment plant, followed by IW (13%) and LIX (11%).
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