swru022008 bioplex technologies feb08
DESCRIPTION
Power to the Parish - Chris Reynell - Bioplex Technologies Ltd and Dairy FarmerTRANSCRIPT
Treating waste naturally
Treating waste naturally
Treating waste naturally
Conventional Anaerobic Digesters
Input 1:20th Digester volume, heated and mixed
Treating waste naturally
Conventional Anaerobic Digesters
• Work well if the feedstock is macerated and/or screened
• However both the capital and running costs may be high
• Problems occur when the waste is unsorted or contains high levels of fibre and grit.
• To overcome silting and blockages the Bioplex digester was developed.
Treating waste naturally
Bioplex Process
Portagester
Heat
The Bioplex process uses as its first stage a modular anaerobic fermenter, which treats organic waste material in less than three days. It uses the process of thermophilic fermentation (the first stage of anaerobic digestion -acid phase hydrolysis) to pasteurise feedstock and naturally separate it into liquid and solid fractions.
The liquid can be used as a liquid fertiliser and/or for second stage anaerobic digestion. The anaerobic digester produces methane rich biogas, which can be used in a boiler or a combined heat and power (CHP) generator to generate electricity and heat.
The solid fraction is relatively odourless and can be safely spread onto farmland or composted.
The composted material is an excellent natural fertiliser and growing medium.
Treating waste naturally
Bioplex Process
The original invention was to eliminate or control the problems of blockages and silting up in conventional anaerobic digesters.
Other benefits were discovered:
• Parallel processing preventing cross-contamination.
• Ease of transport and reduction of materials handling.
• Smaller systems are viable, treat at source.
• Environmental advantages, nitrogen and carbon cycles
• Affordable AD
Treating waste naturally
The Alchemy Project - Devon• The Alchemy Project provides a food waste collection and composting service for 500
people living in Honiton, Dunkeswell and Combe Raleigh.
• Energy is exchanged with a biomass boiler heating system, a biogas fired CHP generator can charge the collection vehicle
• The project shows how organic waste can be dealt with safely, locally and in an environmentally friendly way; it will also result in more local jobs, reduced traffic movements
and lower waste bills! The digester site under construction. July 2006
Kitchen waste - to be digested
After 3 days anaerobic
digestion and 21 days composting
- it’s magic!
Treating waste naturally
HMP Guys Marsh
• To treat catering waste, and use the end product - biofertiliser, within the secure area.
• Process energy is exchanged from wood fired boiler and heating system• The plant operation and gardening using the biofertiliser leads to new jobs and
acquired skills.• Estimated seven year payback period, based on 2007 waste disposal costs.• Helps the site and the service to reduce its carbon footprint.
Treating waste naturally
Fruit and vegetable waste treatment
2. Treatment by thermophilic digestion in
a Portagester
The wastes are chopped to less than 20mm. The packaging enhances the final composting process and the end product.
The treatment of food wastes can meet EU and UK standards for ABPR. The temperature controls pathogens, weed seeds and parasites.
3. The end product after composting and screening
This digested material is a natural slow release fertiliser rich compost. The added fibre helps farmland to resist erosion and flooding.
1. Fruit and vegetable waste as
received
Treating waste naturally
Digestate - Plant Growth Trials
Treating waste naturally
Village - Farm scale
Digester
Community Renewable Energy
CHP Plant
Modular system within polytunnel for solar gain
Designed to use all locally available biofuels
Treating waste naturally
AD using Locally Grown Biofuels
• Maize Silage - Feedstock• 1 MW Anaerobic Digester - CHP Generator. Maize and cattle slurry.
Treating waste naturally
Longstock - Hampshire450 people750 cattle65 horses3000 acres17000 trees
Treating waste naturally
Materials and Energy FlowLongstock Energy
Gas boiler and/or CombinedHeat and Power (CHP) generation
Biogas
Anaerobic DigesterDigestate
Homes, farms and commerce
Compost, fertiliser
Farm animal and horse stable manureCatering and food processing wastesEnergy cropsOrganic fraction of household and trade refuse
Treating waste naturally
The Bonus• Restoring the nitrogen and carbon cycles.
Bioplex
The use of Anaerobic Digestion and Composting is at least Carbon Neutral. Carbon absorption by extra plant growth and replacing fossil fuels and petrochemicals.
Nitrogen cycle restored.
Waste from one source becomes useful for others. Farmland uses recovered fertiliser and fibre.
Farms are good collectors of solar energy. This renewable energy source stored and transported using traditional farm machinery.
Energy recovered and used on site.
Rejuvenates the local economy.
Treating waste naturally
Treating waste naturally