From pilot experiments (0,3–3,6 m3) and full scale application (300 m3) it is shown that the improved anaerobic fluid bed technology represents a very reliable and compact high‐rate technology for the purification of highly fluctuational industrial wastewater. A two‐stage process (acidification/methanation) appeared to have advantages with respect to process stability as well as purification capacity. On full scale the average purification capacity, reached six months after start‐up, was 28 kg COD/m3 day (based on the volume of the methane reactor), with peaks of 50 kg COD/m3 day. Further increases in capacity may be expected in the future.
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