Thermophilic and mesophilic temperature phase anaerobic co-digestion (TPAcD) compared with single-stage co-digestion of sewage sludge and sugar beet pulp lixiviation |
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| Affiliation: | 1. Sanitary Engineering Section, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin, 150090, China;3. Waternet, Korte Ouderkerkerdijk 7, P.O. Box 94370, 1090 GJ, Amsterdam, The Netherlands;4. Environmental Biotechnology Section, Department of Biotechnology, Faculty of Applied Science, Delft University of Technology, Julianalaan 67, 2628 BC, Delft, The Netherlands;1. LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France;2. Naskeo Environnement, 52 rue Paul Vaillant Couturier, 92240 Malakoff, France;3. Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino (FR), Italy;4. Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France;1. Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, corso Duca degli Abruzzi, 24, 10129, Torino, Italy;2. Research Center, Società Metropolitana Acque Torino S.p.A., Viale Maestri del Lavoro, 4, 10127 Torino, Italy |
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| Abstract: | The performance of temperature phase anaerobic co-digestion (TPAcD) for sewage sludge and sugar beet pulp lixiviation (using the process of exchanging the digesting substrate between spatially separated thermophilic and mesophilic digesters) was tested and compared to both single-stage mesophilic and thermophilic anaerobic co-digestion. Two Hydraulic Retention Times (HRT) were studied in the thermophilic stage of anaerobic digestion in two temperature phases, maintaining the optimum time of the mesophilic stage at 10 days, obtained as such in single-stage anaerobic co-digestion. In this way, we obtained the advantages of both temperature regimes.Volatile solids removal efficiency from the TPAcD system depended on the sludge exchange rate, but fell within the 72.6–64.6% range. This was higher than the value of 46.8% obtained with single-stage thermophilic digestion and that of 40.5% obtained with mesophilic digestion. The specific methane yield was 424–468 ml CH4 per gram of volatile solids removed, similar to that of single-stage mesophilic anaerobic digestion. The increase in microbial activity inside the reactor was directly proportional to the organic loading rate (OLR) (or inversely proportional to the HRT) and inversely proportional to the size of the microbial population in single-stage anaerobic co-digestion systems. |
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| Keywords: | Two-phase anaerobic co-digestion Sewage sludge Sugar beet pulp lixiviation Microbial activity |
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