Alchemy TD - Alchemy Utilities

The Next Generation of AD











Higher Gas Output

Bagged Organic Dry Fertiliser

Small Footprint

Continuous Biogas Production

The Alchemy Thermophilic Digester (TD) is a revolutionary biogas system that uses a next generation dry digestion process, improving the energy efficiency typically associated with traditional Anaerobic Digestion (AD) systems. The system is a modular and scalable solution for efficient conversion of organic wastes into biogas and high quality dry pelletised or granulated fertilisers. Taking the advantages of both Thermophilic reactors and dry digestion processes the Alchemy TD is streaks ahead of anything currently available. The Alchemy TD system is able to run on a wide range of organic feedstocks including 100% chicken litter

The Alchemy TD produces 100 kW of electricity and 100 kW of heat through a CHP engine specifically designed to run on the biogas produced by the plant. Requiring as little as 4.7 tonnes per day (@40% dry matter) of input fuel it is an incredibly efficient process. The patented process design produces more gas that is higher in methane content than a traditional AD process, meaning better outputs and returns than similar sized alternatives.

All this is delivered from a package that fits neatly onto a 25 x 25 m space, a significant reduction in size than what can be expected from an AD plant.

Depending on your location there is also potentially the additional benefit of both heat and power incentives from the government. Please see the table below to find out more:    


Incentive Scheme Feed in Tariff (FIT) Feed in Tariff (FIT) Export Rate Renewable Heat Incentive (RHI)
Tariff Type Anaerobic Digestion (<250kW) Anaerobic Digestion (<250kW) Biogas Combustion
Tariff Value 6.19 p/kWh 5.03 p/kWh 4.43 p/kWh

The incentive rates above are an interpretation of the information from the Feed In Tariff, Renewables Obligation and Renewable Heat Incentive Guidance Documents and should only be used as guidance and should not be considered a guarantee.  



Incentive Scheme Feed in Tariff (FIT) Export Rate Renewable Heat Incentive (RHI)
Tariff Type Anaerobic Digestion (<500kW) Wholesale price TBC – announcement due 2017
Tariff Value TBC – due end of 2017 average €60/MWh TBC – announcement due 2017

The incentive rates above are an interpretation of the information from the Feed In Tariff, Renewables Obligation and Renewable Heat Incentive Guidance Documents and should only be used as guidance and should not be considered a guarantee.  

Please contact our sales team who will be able to advise more on other tariffs that may be applicable. 




Key Product Features and Benefits

The benefit of this dry digestion process is the use of only a small amount of water. This is achieved by using specially designed double walled digesters. The inner cylinder holds and moves the digesting organic material (40% dry matter) whilst the outer cylinder helps maintain the working temperature of the thermophilic process by providing a water bed in a closed circuit vastly reducing the need for water, the need to heat a substantial amount of water in order to achieve the thermophilic temperatures and the power requirement to turn the inner cylinder. Furthermore, this also means that the digestate isn’t diluted providing a more valuable end product.

Using the dry digestion we are able to reduce the amount of heat energy needed by approximately 33%. By operating at thermophilic temperatures the Alchemy TD has the potential to produce 10% more gas at a higher methane concentration than regular AD systems. Combining the benefits of dry digestion and thermophilic process the Alchemy TD is by far the most advanced digestive system in the market significantly out performing AD plants and others alike.

The biogas that has been produced can be used for either combined heat and power production (CHP) or simply burned to produce around 250 kW of heat. The digestate left at the end of the process can be used as an organic fertiliser or soil conditioner.

Organic digestion is not a new technology, and has been widely applied in the UK for the treatment of sewage sludge for over 100 years. However, until quite recently it has not been used here for treating waste and creating such a high value product. From just 4.7 tonnes a day feedstock the system is capable of producing 100 kw of heat 100kW of electricity and 1.7 tonnes of pelletized fertilizer. (the system is still in development however early test on cow manure and food waste suggest that these figures will be easily achievable)


Benefits over traditional Anaerobic Digestion (AD):


Alchemy TD

Traditional AD

Footprint  25m x 25m Larger footprint needed for digester, digestate treatment, pasteurization and feed stock storage

4.7 tonnes a day (40% dry matter) using a mix of Slurry / Food waste / Chicken Litter

46 tonnes of pure slurry a day required to achieve similar electrical output.*
Start-up 1 – 2 weeks 4 – 5 weeks
Higher methane concentration 10-15% less methane gas produced
Output Pelletised fertiliser easier to spread and
Wet digestate can be messy to store and handle

*Figure from report published by IEA Bioenergy on small scale AD systems

Technical Data

Model: Alchemy TD 124/165
Input: 4.7 tonnes of Organic Waste (40% dry matter) per day
  Feedstock types: Cow Slurry, Chicken Litter, Grass Silage, Food Waste
Energy Output: 100 kW of Electricity (net after own internal uses)
  100 kW of Heat (net after own internal uses)
Fertiliser Output: 1700 kg / day of (Pelletised or Granulated) 
Dimensions: Complete system fits into approx. 25m x 25m Footprint 
  (Including: Hyginesation, Digester units, Seperator, CHP system, Gas Processing, Pelleting / Granulating Plant)  

The information provided is for guidance only and the manufacturer reserves the right to amend the information at their discretion.

Our Solution to the Waste problem:

In the UK 15 million tonnes of post farm food waste is created every year.  Half of this waste is produced from households, the other half is generated from the manufacturing, retail and hospitality sector. However there is Evidence that one third of this could be avoided. The production, distribution and disposal of this avoidable waste amounts to a large proportion of the UKs annual greenhouse gas emissions (GHG) 3% in total. This amounts to approximately 20 million tonnes of CO2 associated with avoidable food waste per year.

Along with food waste manure and slurries waste stored within the UK amount to approximately 90 million tonnes per year. Not only does this require large structures that take up a lot of space on the farmyard, such as lagoons and silos, it can contribute to environmental factors such as contamination of surface water through leeching, and possible secretion of a bad odour.

There is potential for this slurry to be spread on the farmland as a natural fertilizer however this again has issues of its own. One concern is the possibility of spreading too much slurry, this in turn could potentially kill off earthworms, which are a major part of the echo system when it comes to breaking down dead matter, secondly if slurry was to be spread before heavy rainfall there is a chance that the increase in minerals such as nitrogen and phosphorous may impact local water sources, due to surface runoff. Furthermore the “nitrate vulnerable zone regulations” stipulate that many organic manures cannot be spread through certain times of the year contributing to an already growing surplus that takes up a lot of space and can be costly to store correctly.

The Alchemy TD system is the perfect solution to this growing problem in the UK and abroad. Being able to take a wide range of organic waste streams to produce energy locally, it could significantly reduce the amount of food waste that goes to landfill and agricultural organic waste stored on site. Furthermore, the generation of electricity local to the point of use means that inefficient power plants are less in demand and transmission losses are brought to an absolute minimum.    


Source: WRAP (Waste & Resources Action Programme) 

Source: Eurostat via The Guardian

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