Rate and efficiency of the AD process is controlled by:
- Thermal degradation of molecules at high temperature (300 - 900°C), and in the absence of O2.
- Pyrolysis of sewage sludge produces:
- Liquid bio-oil/tar, combustible gases, fixed carbon (biochar), ash and water vapor
- Consideration of sewage sludge as feedstock or pyrolysis has recently gained attention.
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