Dr A.P. Williams - Staff Profile

Dr Williams

Dr Prysor Williams
Senior Lecturer in Environmental Management

Thoday Building, room F5a

Email: prysor.williams@bangor.ac.uk

Tel: 01248 382637 (from U.K.)
+44 1248 382637 (International)


Responsibilities within SENRGY/BU

Course Director for:

  • BSc/MEnvSci Environmental Science
  • BSc/MEnvSci Environmental Management
  • BSc Agriculture, Conservation and Environment
  • SENRGy Marketing and Recruitment Committee Member
  • Teaching Committee Member
  • Henfaes Committee Member
  • Bangor representative on the All-Wales Environmental Network Panel
  • Member of the Chemical and Biological Science Health and Safety Group
  • Member of the Local Committee for Genetic Manipulation

Qualifications and Membership of Professional Bodies

  • BSc (Hons) Environmental Science; University of Wales, Bangor (2003)
  • PhD Environmental Microbiology; University of Wales, Bangor (2006)

  • Member of Cymdeithas Wyddonol Gwynedd (Welsh Science Society, Gwynedd Branch)
  • Member of the Society for General Microbiology
  • Member of Research & Development Committee for Hybu Cig Cymru
  • Bangor University representative on the Conwy Rural Development Committee
  • Chair of the Welsh Government's Agricultural Industry Climate Change Group
  • Member of the Welsh Government's Strategic Framework Partnership Group for Agriculture (Amaeth Cymru)
  • Guest Editor of Soil Pollution and Public Health
  • Member of the Knowledge Transfer Group of Farming Connect

Research Interests

Pathogens and zoonotic agents (e.g. E. coli O157, Salmonella and Campylobacter): their survival and activity in different environments.

Developing an alternative method to dispose of animal by-products (Bioreduction).

Waste management and utilisation (e.g. Anaerobic Digestion).

Environmental auditing and assessment (e.g. Life Cycle Assessment, Carbon Footprint).

Agriculture and food production (e.g. sustainable intensification, waste, nutrient flows, livestock, pathogens, soils)


Research Projects (either as Co-I or PI):

Henfaes Research Centre – a Farming Connect Innovation Site (Farming Connect, 2015-2020). https://businesswales.gov.wales/farmingconnect/

Distributing our Water Resources: Utilising Integrated Smart & low-Carbon Energy (Interreg; 2016-2020). https://www.dwr-uisce.eu/

Defra Sustainable Intensification Platform Project 1 – Farm-scale interventions at Henfaes Research Centre (2014-2017). http://www.siplatform.org.uk/

Defra Sustainable Intensification Platform Project 2 – Collaborative interventions in the Conwy Catchment (2014-2017). http://www.siplatform.org.uk/

Comparative Lifecycle Assessment of Anaerobic Digestion (Defra; 2012-2013).

Carbon Soil Sequestration: Long-term impacts (Welsh Assembly Government; 2011-2015).

Towards a more sustainable system of water supply: Exploring opportunities for hydropower in Break Pressure Tanks (Interreg; 2011-2014).


Linking urban waste management and farmers’ needs for soil organic matter in Mymensingh, Bangladesh (British Council; 2009-2012).

The biosecurity credentials of in-vessel bioreduction of fallen stock (Welsh Assembly Government and Hybu Cig Cymru – Meat Promotion Wales; 2009-2011).

Comparison of the Life Cycle Assessment of bioreduction of fallen stock with the conventional disposal methods (Industry; 2009-2011).

Survival of viruses within a bioreduction system (National Farmers Union Cymru; 2010-2011).

Determining and treating sources of microbial pollution affecting the Conwy Estuary (Conwy County Council and EU; 2009-2011).

Improving catchment environmental quality through better nutrient management in the livestock farming landscape, Conwy, Wales (Welsh Assembly Government; 2009-2011).

Research Students (either as Co-I or PI):

Non Williams: Optimised management of upland pasture for economic and environmental benefits (EU KESS, Hybu Cig Cymru; 2016-2019).


Luke Tyler: Unlocking the function and value of biostimulants in grassland production systems (EU KESS, Glenside Group Ltd.; 2016-2019).


Sian Rowlands: Understanding the wider impacts of using livestock to control bracken (EU KESS, Welsh Government; 2016-2019).

Laura Miralles: Enhancing carbon storage in Welsh riparian landscapes (EU KESS, Centre for Ecology and Hydrology, 2014-2017).

Yasir Bashawri: Understanding the role of the environment in the spread of antibiotic resistance (Saudi Arabian Government; 2014-2017).

Rory Shaw: Use of real-time in-situ nitrogen sensors to enhance sustainability and reduce costs in livestock systems (DairyCo., QMS, Eblex, Hybu Cig Cymru; 2011-2014).

John Hyland: Reducing the environmental impact of the Welsh red meat sector (EU KESS, Hybu Cig Cymru; 2011-2014).

Darren Owen: Phosphorus acquisition from soils using novel biostimulants (EU KESS, Glenside Group Ltd.; 2011-2014).

Peter Goude: Ecology of the human pathogen E. coli O157 in freshwater ecosystems (NERC; 2008-2011).

Rabya Lahmer: Development of antimicrobial food packaging (Libyan Government; 2009-2012).

John Walsh: Optimising Anaerobic Digestion to improve the economic and environmental performance of organic farming systems (EU KESS, Calon Wen, and FRE-Energy; 2009-2012).

Ceri Gwyther: In-vessel bioreduction as an alternative method to dispose of fallen stock (BPEX; 2008-2011).

Hassin Adam: Prevalence of E. coli O157 within the soils and livestock of North Wales (Libyan Government; 2008-2011).

Recent Publications


Hyland JJ, Jones DL, Parkhill KA, Barnes AP, Williams AP (2016) Farmers’ perceptions of climate change: identifying types. Agriculture and Human Values 33, 323-339.

Hyland JJ, Styles D, Jones DL, Williams AP (2016) Improving livestock production efficiencies presents a major opportunity to reduce sectorial greenhouse gas emissions. Agricultural Systems 147, 123-131.

Shaw R, Lark RM, Williams AP, Chadwick DR, Jones DL (2016) Characterising the within-field scale spatial variation of nitrogen in a grassland soil to inform the efficient design of in-situ nitrogen sensor networks for precision agriculture. Agriculture, Ecosystems & Environment 230, 294-306.



Gallagher J, Styles D, McNabola A, Williams AP (2015) Inventory compilation for hydropower systems: the perils of materiality thresholds and priority impact categories. International Journal of Life Cycle Assessment 20, 1701-1707.

Styles D, Gibbons J, Williams AP, Dauber J, Stichnothe H, Urban D, Chadwick DR, Jones DL (2015) Consequential life cycle assessment of biogas, biofuel and biomass energy options within an arable rotation. Global Change Biology Bioenergy 7, 1305-1320.

Styles D, Gibbons J, Williams AP, Stichnothe H, Chadwick DR, Healey JR (2015) Cattle feed or bioenergy? Consequential life cycle assessment of biogas feedstock scenarios on dairy farms. Global Change Biology Bioenergy 7, 1034-1049.

Gallagher J, Styles D, McNabola A, Williams AP (2015) Making green technology greener: Achieving a balance between carbon and resource savings through ecodesign in hydropower systems. Resources, Conservation and Recycling 105, 11-17.

Gallagher J, Styles D, McNabola A, Williams AP (2015) Current and future environmental balance of small-scale run-of-river hydropower. Environmental Science & Technology 49, 6344-6351.

Gallagher J, Styles D, McNabola A, Williams AP (2015) A strategic assessment of micro-hydropower in the UK and Irish water industry: identifying technical and economic constraints. Renewable Energy 81, 808-815.

Owen D, Williams AP, Griffith GW, Withers PJA (2015) Use of commercial bio-inoculants to increase agricultural production through improved phosphorus acquisition. Applied Soil Ecology 86, 41-54.



Adkin A, Jones DL, Eckford RL, Edwards-Jones G, Williams AP (2014) A quantitative risk assessment for the safety of carcase storage systems for scrapie-infected farms. Journal of Applied Microbiology 117, 940-948.

Gibbons JM, Williamson JC, Williams AP, Withers PJA, Hockley N, Harris IM, Hughes JW, Taylor RL, Jones DL, Healey JR (2014) Sustainable nutrient management at field, farm and regional level: soil testing, nutrient budgets and the trade-off between lime application and greenhouse gas emissions. Agriculture, Ecosystems & Environment 188, 48-56.

Gwyther CL, Jones DL, Gertler C, Edwards-Jones G, Williams AP (2014) Changes in the physicochemical properties and enzymatic activity of waste during bioreduction of pig carcasses. Environmental Technology 35, 1904-1915.

Lahmer RA, Jones DL, Townsend S, Baker S, Williams AP (2014) Susceptibility of Escherichia coli O157 to chitosan-arginine in beef liquid purge is affected by bacterial cell growth phase. International Journal of Food Science and Technology 49, 515-520.

McNabola A, Coughlan P, Williams AP (2014) Energy recovery in the water industry: an assessment of the potential of micro-hydropower. Water and Environment Journal 28, 294-304.

McNabola A, Coughlan P, Corcoran L, Power C, Williams AP, Harris I, Gallagher J, Styles D (2014) Energy recovery in the water industry using micro-hydropower: an opportunity to improve sustainability. Water Policy 16, 168-183

Shaw R, Williams AP, Jones DL (2014) Assessing soil nitrogen availability using microdialysis-derived diffusive flux measurement. Soil Science Society of America 78, 1797-1803.



Alhelfi NA, Adam H, Jones DL, Williams AP (2013) Absence of Escherichia coli O157:H7 in sheep and cattle faeces in North Wales. Veterinary Record 173, 143.

Gwyther CL, Jones DL, Golyshin PN, Edwards-Jones G, McKillen J, McNair I, McDonald J, Williams AP (2013) Bioreduction of sheep carcasses effectively contains and reduces pathogen levels under operational and simulated breakdown conditions. Environmental Science & Technology 47, 5267-5275.

McNabola A, Coughlan P, Williams AP (2013) Energy recovery in the water industry: an assessment of the potential of micro-hydropower. Water and Environment Journal 27, 435-436.

Quilliam RS, Cross P, Williams AP, Edwards-Jones G, Salmon RL, Rigby D, Chalmers RM, Thomas DRh, Jones DL (2013) Subclinical infection and asymptomatic carriage of gastrointestinal zoonoses: occupational exposure, environmental pathways, and the anonymous spread of disease. Epidemiology and Infection 141, 2011-2021.

Shaw R, Williams AP, Miller A, Jones DL (2013) Assessing the potential for ion selective electrodes and dual wavelength UV spectroscopy as a rapid on-farm measurement of soil nitrate concentration. Agriculture 3, 327-341.

Wellington EMH, Boxall ABA, Cross P, Feil EJ, Gaze WH, Hawkey PM, Johnson-Rollings AS, Jones DL, Lee NM, Otten W, Thomas CM, Williams AP (2013)The role of the natural environment in the emergence of antibiotic resistance in Gram-negative bacteria. The Lancet Infectious Diseases 13, 155-165.

Williams AP, Gordon H, Jones DL, Killham K, Strachan NJC, Forbes KJ (2013) Declining reactivation ability of Escherichia coli O157 following incubation within soil. Soil Biology & Biochemistry 63, 86-88.


Alhelfi NA, Lahmer RA, Jones DL, Williams AP (2012) Survival and metabolic activity of lux-marked Escherichia coli O157:H7 in different types of milk. Journal of Dairy Research 79, 257-261.

Gwyther CL, Jones DL, Golyshin PN, Edwards-Jones G, Williams AP (2012) Fate of pathogens in a simulated bioreduction system for livestock carcasses. Waste Management 32, 933-938.

Lahmer RA, Williams AP, Townsend S, Baker S, Jones DL (2012) Antibacterial action of chitosan-arginine against Escherichia coli O157 in chicken juice. Food Control 26, 206-211.

Quilliam RS, Chalmers RM, Williams AP, Chart H, Willshaw GA, Kench SM, Edwards-Jones G, Evans J, Thomas DRh, Salmon RL, Jones DL (2012) Seroprevalence and risk factors associated with verocytotoxin-producing Escherichia coli O157 in a farming population. Zoonoses and Public Health 59, 83-88

Quilliam RS, Williams AP, Jones DL (2012) Lettuce cultivar mediates both phyllosphere and rhizosphere activity of Escherichia coli O157:H7. PLoS ONE 7 (3): e33842.

Rotariu O, Ogden ID, MacRitchie L, Forbes KJ, Williams AP,  Cross P, Hunter CJ, Teunis PFM, Strachan NJC (2012). Combining risk assessment and epidemiological risk factors to elucidate the sources of human E. coli O157 infection. Epidemiology and Infection 140, 1414-1429.

Walsh JJ, Edwards-Jones G, Jones DL, Williams AP (2012) Replacing inorganic fertilizer with anaerobic digestate may maintain agricultural productivity at less environmental cost. Journal of Plant Nutrition and Soil Science 175, 840-845.

Walsh JJ, Rousk J, Edwards-Jones G, Jones DL, Williams AP (2012) Fungal and bacterial growth following the application of slurry and anaerobic digestate of livestock manure to temperate pasture soils. Biology and Fertility of Soils 48, 889-897.

Williams AP, Quilliam RS, Thorn CE, Cooper D, Reynolds B, Jones DL (2012) Influence of land use and nutrient flux on metabolic activity of E. coli O157 in river water. Water, Air & Soil Pollution 223, 3077-3083.


Gwyther, C.L., Williams, A.P., Golyshin, P.N., Edwards-Jones, G. and Jones, D.L. (2011) The environmental and biosecurity characteristics of livestock carcass disposal methods: a review. Waste Management 31: 767-778.

Jones, C.D.R., Hunter, C., Williams, A.P., Strachan, N.J.C., Cross, P. (2011) Escherichia coli O157: comparing awareness of rural residents and visitors in livestock farming areas. Epidemiology and Infection 139, 1522–1530.

Quilliam, R.S., Williams, A.P., Avery, L.M., Malham, S.K., Jones, D.L. (2011) Unearthing human pathogens at the agricultural-environment interface: a review of current methods for the detection of E. coli O157 in freshwater ecosystems. Agriculture, Ecosystems & Environment 140, 354-360.

Strachan NJC, Hunter CJ, Jones CDR, Wilson RS, Ethelberg S, Cross P, Williams AP, MacRitchie L, Rotariu O, Chadwick D (2011) The relationship between popular and scientific understandings of Escherichia coli O157 risk. Philosophical Transactions of the Royal Society B 366, 1999-2009.

Thorn CE, Quilliam RS, Williams AP, Malham SK, Cooper D, Reynolds B, Jones DL (2011) Grazing intensity is a poor indicator of waterborne Escherichia coli O157 activity. Anaerobe 17, 330-333.

Cross, P., Edwards-Jones, G., Omed, H. and Williams, A.P. (2010) Use of a Randomized Response Technique to obtain sensitive information on animal disease prevalence. Preventive Veterinary Medicine 96: 252-262.

Malpass MC, Williams AP, Jones DL, Omed H (2010) Microbiological quality of chicken wings damaged on the farm or in the processing plant. Food Microbiology ­27: 521-525.

Avery, L.M., Williams, A.P., Killham, K. and Jones, D.L. (2009) Heat and lime-treatment as effective control methods for E. coli O157: H7. Bioresource Technology 100: 2692-2698.

Cross, P., Williams, P. and Edwards-Jones, G. (2009) Communication of bluetongue mitigation techniques (response to Carpenter and Nomikou). Veterinary Record 165: 636.

Cross, P., Williams, P. and Edwards-Jones, G. (2009) Differences in the perceptions of farmers and veterinary surgeons about the efficacy of mitigation strategies for controlling bluetongue. Veterinary Record 165: 397-403.

Williams, A.P., Edwards-Jones, G. and Jones, D.L. (2009) In-vessel bioreduction provides an effective storage and pre-treatment method for livestock carcasses prior to final disposal. Bioresource Technology 100: 4032-4040.

Avery, L.M., Williams, A.P., Killham, K. and Jones, D.L. (2008) Survival of Escherichia coli O157:H7 in waters from lakes, rivers, puddles and animal drinking troughs. Science of the Total Environment 389: 378-385.

Gordon, H., Edwards-Jones, G., Roberts, J., Wossink, A., Hunter, C., Chadwick, D., Ogden, I., Jones, D., Strachan, N., Rigby, D., Farrington, J., Teunis, P., Kosmider, R., Williams, P., Cross, P. and Killham, K. (2008) Reducing Escherichia coli O157 risk in rural communities. In Crighton, K. and Audsley, R. (eds.), Agriculture and the Environment VII Land Management in a Changing Environment: Proceedings of the SAC and SEPA Biennial Conference, Edinburgh. pp. 298-301.

Williams, A.P., Avery, L.M., Killham, K. and Jones, D.L. (2008) Moisture, sawdust, and bleach regulate the persistence of Escherichia coli O157:H7 on floor surfaces in butcher shops. Food Control 19: 1119-1125.

Williams, A.P., Gordon, H., Jones, D.L., Strachan, N.J.C., Avery, L.M. and Killham, K. (2008) Leaching of bioluminescent Escherichia coli O157:H7 from sheep and cattle faeces during simulated rainstorm events. Journal of Applied Microbiology 105: 1452-1460.

Williams, A.P., McGregor, K.A., Killham, K. and Jones, D.L. (2008) Persistence and metabolic activity of Escherichia coli O157:H7 in farm animal faeces. FEMS Microbiology Letters 287: 168-173.

Williams, A.P., Avery, L.M., Killham, K. and Jones, D.L. (2007) Persistence, dissipation, and activity of Escherichia coli O157:H7 within sand and seawater environments. FEMS Microbiology Ecology 60: 24-32.

Williams, A.P., Avery, L.M., Killham, K. and Jones, D.L. (2007) Survival of E. coli O157:H7 in organic waste-amended soils: influence of a rhizosphere. Journal of Applied Microbiology 102: 319-326.

Williams, A.P., Roberts, P., Avery, L.M., Killham, K. and Jones, D.L. (2006) Earthworms as vectors of Escherichia coli O157:H7 in soil and vermicomposts. FEMS Microbiology Ecology 58: 54-64.

Williams, A.P., Avery, L.M., Killham, K. and Jones, D.L. (2005) Persistence of Escherichia coli O157 on farm surfaces under different environmental conditions. Journal of Applied Microbiology 98: 1075-1083.

Other Interests

Farming; sports (participating and watching); Welsh history, literature, and culture; shooting and fishing; singing (with Hogie'r Berfeddwlad); various activities with Aelwyd Bro Cernyw.