Anaerobic Digestion of Lignocellulosic Waste after Thermal Hydrolysis and Steam Dsintegration. Keith Panter, Ebcor Ltd

Transkript

1 Anaerobic Digestion of Lignocellulosic Waste after Thermal Hydrolysis and Steam Dsintegration Keith Panter, Ebcor Ltd Presentasjon av Cambi's virksomhetsområder og prosessteknologi

2 Cambi is the market leader in AD pre-treatment worldwide Established in Global industry leader in our segment (advanced biogas production from sewage sludge and biowaste) with 50 plants in operation worldwide and 10 plants under construction Treat sludge and biowaste from 50 million people - Mostly sewage sludge with some food waste and codigestion projects Yearly production of 2,500 GWh biogas energy and 1000 GWh electrical energy 4 million tonnes of Class A cake used in Agriculture

3 NO ODOUR WHEN SPREADING, STABLE CAKE PILE CAMBI CAKE, ABERDEEN

4 COTTON VALLEY, MILTON KEYNES, UK

5 CAMBI THP Process Presentasjon av Cambi's virksomhetsområder og prosessteknologi

6 Principles of Cambi Hydrolysis/ Steam Disintegration Batch heat sterilization Meets all known safety standards worldwide, USEPA alternate 1 time/temp Class A batch no reactivation Destruction of Extra Cellular Polymer ECP Biological sludge becomes compressible for dewatering (10% DS% gain) and less viscous (10% hydrolysed =~ 5% conventional) Hydrolysis of insoluble COD 30-50% solubilisation enables very rapid digestion, 10 days HRT, 60% VSR Steam disintegration of particulate matter Increases digestion rate and reduces viscosity further

7 Features of Cambi Invention Optimum temperature about 160º C to avoid side-stream issue pressure cooking not caramelization Batch process with steam injection (6 bar) - to avoid heat exchangers scaling and corrosion Treats high DS% material and has internal recycle of steam to reduce energy consumption Steam pressure drop disintegration reduces particle size, delignifies and reduces viscosity for subsequent digestion Coupling with anaerobic digestion high solids digestion to make a biosolids for recycling/disposal and improve energy balance. High gas yields at short retention.

8 CAMBI Thermal Hydrolysis - Advantages 50% more biogas production than conventional technology 50% mass reduction compared with conventional digestion 2-3 times enhanced digester capacity 100% pathogen destruction Low cost operation normally operated off waste heat from CHP though some GtG projects in UK where steam energy is from biogas/natural gas (Howdon, Minworth, Five Fords) Presentasjon av Cambi's virksomhetsområder og prosessteknologi

9 CAMBI R&D Projects with Universities and Utilities Ensure flow of new ideas New products and services Continuous improvements Patents

10 THP for lignocellulosic materials with high DS 50-90% DS degc 6-33 bar Rapid pressure release 11

11 Presentasjon av Cambi's virksomhetsområder og prosessteknologi

12 Steam explosion of wood chips from Spruce Presentasjon av Cambi's virksomhetsområder og prosessteknologi

13 Optimizing Biogas yield from cellulosic materials with Cambi THP Feedstock Yield Digester volume Presentasjon av Cambi's virksomhetsområder og prosessteknologi Untreated milled

14 Biogas yield (ml biogas / g VS) Optimizing Biogas yield from cellulosic materials with Cambi THP Days Presentasjon av Cambi's virksomhetsområder og prosessteknologi Steam exploded Hemp Untreated Hemp Cellulose Innoculum

15 Untreated vs Cambi THP for Pomace

16 Cavitation + THP vs Untreated + THP Pomace

17 Gas yield (nl CH4/kg VS) Biogas from chicken feathers Time (days) Steam exploded Untreated Presentasjon av Cambi's virksomhetsområder og prosessteknologi

18 Optimize feed stock blend for Codigestion C/N ratio C/N

19 Status of Cambi w.r.t. to Lignocellulose It is possible to get reasonable yields of biogas from lignocellulosic waste comparable to pure cellulose The science and conditions are well understood for hydrolysis and digestion To date the economics have generally not been favourable But maybe incentives could change that?