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In this study a novel accelerated restart strategy has been developed for a two stage anaerobic digestion system, involving acid phase digestion of sewage biosolids, followed by mesophilic digestion. The strategy involves start-up of the acid phase process, and then restart of the secondary mesophilic digesters, following a feed starvation period, and without re-inoculation. Process simulation with BioWin 4.1 software was coupled with continuous lab-scale trials to inform a full sized trial, which in turn defined the full plant restart schedule. Biosolids feed shut down period, and feed loading and feed acceleration rates were explored via lab-scale trials and simulation. The lab and simulation trials lead to the proposal of a 21 day restart profile for start-up and recovery of the two-stage anaerobic digestion process. This profile involved an initial feed load of 39% of the normal steady-state flow, and a 5% daily feed flow ramp up rate, following a 3 week starvation period. This accelerated restart strategy was successfully deployed on a 24,500 m3 anaerobic digester system in the UK. During restart the concentration of VFAs remained less than 1,500 mg L-1, whilst pH and alkalinity were stable around 7.8 and 5,000 mg L-1, resulting in a stable recovery.
|Publication status||Published - 20 Nov 2017|
|Event||EUROPEAN BIOSOLIDS AND ORGANIC RESOURCES CONFERENCE - Royal Armouries, Leeds, UK United Kingdom|
Duration: 20 Nov 2017 → 21 Nov 2017
|Conference||EUROPEAN BIOSOLIDS AND ORGANIC RESOURCES CONFERENCE|
|Country||UK United Kingdom|
|Period||20/11/17 → 21/11/17|
- anaerobic digestion
- Simulation and Modeling
- Sludge digestion
- waste water treatment
- acid phase digestion
ASJC Scopus subject areas
- Environmental Engineering
Forgacs, G., Smyth, M., Law, I., & Arnot, T. (2017). BioWin modelling to reduce the Avonmouth digester commissioning programme from 6 months to 6 weeks. Paper presented at EUROPEAN BIOSOLIDS AND ORGANIC RESOURCES CONFERENCE, Leeds, UK United Kingdom.