Mesophilic and thermophilic anaerobic co-digestion of winery wastewater sludge and wine lees: An integrated approach for sustainable wine production

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:203

Article

Da Ros, C.¹  Cavinato, C.¹  Pavan, P.¹  Bolzonella, D.² 

[1] Univ Ca Foscari Venice, Dept Environm Sci Informat & Stat, Via Torino 155, I-30172 Venice, Italy

[2] Univ Verona, Dept Biotechnol, Str La Grazie 15, I-37134 Verona, Italy

关键词: Anaerobic digestion;    Dewatering;    Mesophilic;    Thermophilic;    Trace elements;    Winery wastes;   

DOI  :  10.1016/j.jenvman.2016.03.029

来源: Elsevier

【 摘 要 】

In this work, winery wastes generated by a cellar producing approximately 300,000 hL of wine per year was monitored for a period of one year. On average, 196 L of wastewater, 0.1 kg of waste activated sludge (dry matter) and 1.6 kg of wine lees were produced per hectoliter of wine produced. Different winery wastes, deriving from different production steps, namely waste activated sludge from wastewater treatment and wine lees, were co-treated using an anaerobic digestion process. Testing was conducted on a pilot scale for both mesophilic and thermophilic conditions. The process was stable for a long period at 37 degrees C, with an average biogas production of 0.386 m(3)/kg CODfed. On the other hand, for thermophilic conditions, volatile fatty acids accumulated in the reactor and the process failed after one hydraulic retention time (23 days). In order to fix the biological process, trace elements (iron, cobalt and nickel) were added to the feed of the thermophilic reactor. Metals augmentation improved process stability and yields at 55 degrees C. The pH ranged between 7.8 and 8.0, and specific gas production was 0.450 m(3)/kg CODfed, which corresponded to dry matter and COD removals of 34% and 88%, respectively. Although the observed performances in terms of biogas production were good, the thermophilic process exhibited some limitations related to both the necessity of metals addition and the worse dewaterability properties. In fact, while the mesophilic digestates reached a good dewatering quality via the addition of 6.5 g of polymer per kg of dry matter, the required dosage for the thermophilic sludge was greater than 10 g/kg of dry matter. (C) 2016 Elsevier Ltd. All rights reserved.

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