The FITEC process for anaerobic bio waste recovery consists of two treatment steps for the organic waste. 

1. In the first stage (conditioning) the waste is crushed and blended with circulation water to get a medium with a total solid content (TS content) of <25%. Subsequently, the first separation of contaminants (80%) takes place. The contaminants are conveyed in a pipeline to the second stage separation and heated to a temperature above 70°C. There, in a second separation stage the ingredients which became liquid and pasty by the heating are separated. The remaining contaminants have a TS content >50% and can be composted, dried or disposed for example. 

The liquid / pasty ingredients are sanitised in a double-tube heat exchanger (1 hour at 70 °C) and distributed into the digesters. The biogas is produced in the digesters and used to generate electricity and heat in a CHP. The digestate that remains in the digesters can be used as liquid fertilizer. Alternatively, it can undergo a solid-liquid separation, whereas the solids are a marketable compost after composting. The centrifuged water is cleaned by a water treatment (such as sequencing batch reactor, SBR). 

2. The second stage of contaminant separation takes place continuously in the digesters. Due to the biodegradation solids such as fragments of egg shells and glass, bone fragments etc. sediment on the floor of the digester. These are discharged by the Fitec-floor scrapper that is the floor of the digester is cleaned regularly. Floating substances such as plastic pieces, cork remains, etc. are carried out by Fitec-skimmer from the digester. 

An accumulation of contaminants in the digester is thus impossible, so that the permanent function is granted and the system can work long-term without interruptions. 

The way from the delivery to the treatment (PDF)

[Bio waste treatment, the way from the delivery to the treatment] PDF File