Current Realities for Anaerobic Digestion: Incorporating High Solids Anaerobic Digestion into an Existing Composting Facility

Transcription

1 Current Realities for Anaerobic Digestion: Incorporating High Solids Anaerobic Digestion into an Existing Composting Facility By Steve Aujla and Dieter Geesing Presented at the CCC Workshop Vancouver, BC February 08, 2011

2 H a rves t a t a G la nc e We manage organic waste streams: Foodwaste, biosolids, wood waste and yard waste We add value: Operational expertise, end-product marketing and renewable energy Experienced team: 200+ years in organic waste management Strong historical and projected growth: 250% from 2009 to 2010 Cluster focus: Selected geographical clusters Technology focus: Open platform for use of other technologies 2

3 E x tra c ting M a x im um V a lue fro m O rg a nic W a s te Divert organic waste out of landfills Lower disposal costs, reducing GHG Extract renewable energy Added Value Produce organic fertilizer Added Value Manage the complete cycle of organic waste material 3

4 E x tra c ting M a x im um V a lue fro m O rg a nic W a s te (c o nt d) 4

5 Fra s er R ic hm o nd S o il & Fibre (B C ) Two Covered Aerated Static Pile (CASP) systems Each 100,000 CY Using negative aeration nput ~ 200,000 tons/ year utput ~ 400,000 CY/year (blended soil products) inimized odors rinding, turning, cover, and process control are unique to 5

6 U nique A s pec ts o f H a rves t C o m po s ting Reduced Energy Costs 38% less energy consumption per ton through improved grinding and aeration technology High Throughput 36% more processing capacity due to greater space efficiency Seasonal Peak Capacity More tolerant of seasonal differences in volume and moisture levels High-Quality, High-Value Compost Our products sell as fast as we can manufacture them, indicating demand is greater than supply 6

7 Fra s er R ic hm o nd S o il & Fibre (B C ) Site has space for High Solids Anaerobic Digestion (HSAD) Co-digestion of urban materials in batch tunnels Simplified grinding, mixing, heating, feedstock Output can be composted Existing infrastructure serves both HSAD and composting Scales, composting, screening, contaminant control, odor control, product marketing 7

8 C A S P B io filtra tio n Biofilters - Two at 42,000 cfm flowrate each 8

9 S c reening a nd C o nta m ina nt R em o va l Six-product screening plant - 1,000 CY per hour 9

10 M a teria l H a ndling Large buckets help minimize incidental odor emissions 10

11 S ite T o urs Bucket Capacity: 23 not quite full 11

12 O pera tio na l E x c ellenc e a nd Q ua lity An enterprise-wide approach for Harvest Performance specifications for compost, soil, mulch, fertilizer, biogas, and other manufactured outputs Products are measured against quality targets Harvest manages quality with specific plans regarding environmental management, operating procedures, and testing The Harvest Operational Excellence and Quality Management System will be used in accordance with American Society of Quality Training and Standards 12

13 P ro duc t Q ua lity A s s ura nc e in P ra c tic e Create a facility design so the product is not sold before its time A true batch system to track inventory and allow quality control to work A routine that works for the production crew A process control system where metrics and quality assurance can be used Create a management culture to assure quality Create a road map to assure results Install measurement and improvement at the operations level Setting goals and comparing production to those goals Creating a report card for the plant Implement accountability and reward for good achievement Link the results to research and testimony to differentiate us in the market Manage contaminants at the source through education and container design, during collection, at receiving, and at finishing 13

14 I nc o rpo ra ting H ig h S o lids A na ero bic D ig es tio n Anaerobic Digestion Feedstock Ideal for multi-family, commercial and food processing organics Can accept residential curbside collected organics Contamination and bio-plastics have to be managed to succeed HSAD Attributes Batch operation, fully enclosed for odor control 100 F (38 C) Mesophilic temperatures days residence time Feedstock must have some porosity and must be stackable grinding not required Digestate is easily composted Water balance is manageable through feedstock mix design 14

15 T he D rivers fo r M a k ing H S A D a R ea lity British Columbia leads North America in promoting goals of environmental management and sustainability. Metro Vancouver region waste management issues: 1. L a ndfilling is 1. Fo s s il Fuel dependenc y uns us ta ina ble - lo ng C o m m unities a re s eek ing dis ta nc es a nd inc rea s ing ly s us ta ina ble a lterna tive hig h c o s ts fo r dis po s a l, fuels. C a rbo n ta x a nd lim ited c a pa c ity, a nd energ y po lic y c rea tes a g enera tio n o f m etha ne s ta ble m a rk et fo r g a s es fro m o rg a nic w a s te renew a bles. 2. T he Z ero W a s te C ha lleng e - la ndfill divers io n g o a ls c a nno t be m et us ing c urrent rec yc ling a nd divers io n s tra teg ies 2. D em a nd fo r hig h-qua lity, nutrient-ric h s o il a nd c o m po s t pro duc ts 15

16 H S A D C o m po nents 16

17 H S A D C ro s s S ec tio n Feedstock Preparation Hydrolysis Percolator (Anaerobic Batch Mechanical Systems

18 Process Fundamentals 18

19 P ro c es s Funda m enta ls (c o nt d) Sale of Finished Product Waste material delivered into enclosure for preparation Feedstock is stackable in pile form and water in the form of hydrolyzed liquids can percolate through it 19

20 P ro c es s Funda m enta ls (c o nt d) Sale of Finished Product Input material placed into hydrolysis percolators Organic acids (nutrients) are extracted by percolation Each percolator accepts 3,000 tons per year 20

21 P ro c es s Funda m enta ls (c o nt d) Sale of Finished Product Nutrients are in solution and fed to a high rate anaerobic digester Remaining digestate is removed from the percolator for aerobic composting 21

22 P ro c es s Funda m enta ls (c o nt d) Finished compost product is screened and sold as soil, fertilizer, or compost Sale of Finished Product Biomethane is sold as green natural gas, burned for electricity, or compressed into CNG vehicle fuel 22

23 G reen E nerg y C entre Sale of Finished Product 23

24 Fo llow U p Q ues tio ns Sale of Finished Product 24