Any of the following or a mixture

• PFA (pulverised fuel ash) including bottom ash and slag from coal fired power stations
• Most types of dredged marine silts and aggregate washings that will typically contain silica / clay / organic materials. This silt may contain heavy metal contaminates which within reasonable limits can be dealt with by the RTAL Process
• Clay extracted from building works (or clay specifically extracted for use in the process with the excavated area later used for landfill )
• Ash from other incinerator plants
• Sludge, i.e. from water treatment works, textile plants and other commercial processes (would usually have to be mixed with one of the above materials)
• Mine tailings Quarry over-burden

Any biodegradable material which can be handled and can be either dry powdered or will slurry including

• Sewage cake
• Biodegradable part of MSW (Municipal garbage)
• Carbon / slag from gasification
• Paper pulp cake
• Farming slurries and Chicken/turkey wastes
• Methane gas from existing landfill sites
• Gas from gasification process

Excess carbon from high carbon PFA, mine tailings etc.