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Statistical modelling anaerobic digestion for process optimisation and bench-marking: a case study of E. coli inactivation across all Thames Water conventional sewage sludge treatment sites
- Source :
- Water and Environment Journal. 31:498-507
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- Untreated sewage sludge potentially contains a wide range of enteric pathogens that present a risk to human health. Mesophilic anaerobic digestion (MAD) is the most-favoured process for sewage sludge treatment in the United Kingdom. It is a well-established approach to sludge stabilisation, but the mechanisms responsible for pathogen removal are poorly understood. Operational data collected by Thames Water from conventional MAD sites were statistically scrutinised to examine the effects of primary and secondary digestion on the removal of the enteric indicator bacteria, Escherichia coli, by using the IBM SPSS statistical software package for ANOVA, post-hoc and multiple regression analysis. The results showed that the process temperature conditions at the MAD plants were equivalent to or exceeded the minimum estimated by the analysis necessary to comply with the 2 log10 removal standard for E. coli. The results also showed that primary digestion conditions (specifically temperature) sublethally damaged E. coli and increased decay in secondary digestion and therefore over the whole digestion process.
- Subjects :
- 0301 basic medicine
Environmental Engineering
Waste management
030106 microbiology
Indicator bacteria
Bench marking
Management, Monitoring, Policy and Law
Biology
medicine.disease_cause
Pulp and paper industry
Pollution
03 medical and health sciences
Anaerobic digestion
Digestion (alchemy)
medicine
Sewage sludge treatment
Escherichia coli
Sludge
Water Science and Technology
Mesophile
Subjects
Details
- ISSN :
- 17476585
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Water and Environment Journal
- Accession number :
- edsair.doi...........833f86c8ad6a8d12c152417fd560a9b6