Proceedings

Process intensifying the circular biosolids economy via hydrodynamic cavitation. Increasing biogas and biomethane yields of secondary sewage sludge AD plants: PRESENTATION ONLY

Greenwood, E.1 and Ageridis, N.2, 1CaviMax Ltd, UK, 2Projective Ltd

(free)

We would like to share our recent findings through trials that we have been carrying out by disintegration of biomass in secondary sludges, through particle size reduction and subsequent nutrient release of energy locked recalcitrant materials, we are achieving more with less and optimising current AD plants.

Through hydrodynamic cavitation we have increased biogas and biomethane yields with the same amount of feedstock, reducing retention times in the digester which reduces feeding bottle necks, and reduced hydrogen sulphide.

This paper will discuss:

• Cavitation spot trial findings, we will present with our client / partner. Please note that we are not utilising acoustic cavitation, hydrodynamic cavitation is many orders of magnitude a more powerful and fully scalable technology • Compatibility with hydrolysis plants onsite, it is not a case of competing technologies, rather hydrolysis and hydrodynamic cavitation are synergistic partners • Other intangible benefits we will aim to quantify over the coming months, E. coli kill after centrifuge reactivation, reduces biosolids at the end of the AD process as more sludge is converted to biogas, homogenisation of tankered sludges to increase tanker emptying by reducing solids settling out in the tank
This is already exciting and fundamental work for sewage based anaerobic digestion, however the story need not stop there, we are looking to find partners who would like to explore biorefining of waste water remediation algae to upscale cell lysis to increase yield of end products, pharmaceutical API reduction in waste water treatment plants, COD reduction of effluent waters and also desalination, all with the hydrodynamic cavitation reactor.

The themes for the conference we will specifically be linked with are:-

• Climate change resilience in bioresource production and use – hydrodynamic cavitation is a carbon and energy use process intensification technology.

• Delivering operational efficiencies in AMP7 – cavitation increases overall AD plant energy efficiencies due to viscosity reduction of substrates

• Engineering and biological advances in AD – hydrodynamic cavitation is an engineering innovation applied to the biogas / biosolids / sludge sectors

• Biogas & energy management – hydrodynamic cavitation increases biogas yields

• Technology integration, biorefineries and the circular economy – hydrodynamic cavitation can also be utilised to process organic waste streams into second and third generation feedstocks

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