Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 8, Pages 2706-2712Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.11.101
Keywords
Anaerobic digestion; Class A biosolids; Sewage sludge; Thermophilic-mesophilic-phase
Funding
- Spanish Ministry for the Environment, Rural Affairs and Marine Policy [148/PC08/3-04.3]
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Regulations regarding the land application of sewage sludge require the performance of highly efficient treatments for pathogen reduction, such as temperature-phased anaerobic digestion (TPAD). Several semi-continuous experiments with different solid residence times (SRTs) have been made to find the best combination - TPAD 15/15, TPAD 5/15, TPAD 3/15 or TPAD 3/12. TPAD systems showed better performance in terms of VS destruction, gas production, sludge dewaterability, and process stability at total SRT of 15 days, compared with single-stage mesophilic or thermophilic digestion at the same SRT. Average VS reductions (VSR) using the overall TPAD 5/15 (78%), TPAD 3/15 (87%), and TPAD 3/12 (87%) were significantly higher than mesophilic control operating with an SRT of 15 days (40% VSR). The best results were obtained for TPAD 3/15 with 0.62 LCH4 g(-1) VSr, faecal coliform 10(3) MPN/g TS, and Salmonella spp. 1 MPN/4 g TS. Although both TPAD 3/15 and TPAD 3/12 were efficient enough to obtain Class A biosolids. (C) 2009 Elsevier Ltd. All rights reserved.
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