Innovative press technology for sewage sludge dewatering
As a result of a detailed eco-toxicological risk evaluation
agricultural use of sewage sludge will be banned in Switzerland from
2005. In future 100% of the sewage sludge will be incinerated. The dewatered
sludge must have minimum dried solids content (DS) 40-45% in order to
ensure an energy neutral incineration. In co-operation with the company
Bucher Guyer AG and the WWTP Glarnerland full scale trials were accomplished
for mechanical de-watering of raw and digested sludge by means of a
de-juicing press. Beside sludge from the WWTP Glarnerland sludge from
five other WWTP`s were also de-watered. The investigations show that
with the tested press system DS contents of 32-41% with a throughput
of approximately 5 m3 liquid sludge h-1 could be reached. The de-juicing
press system achieved several percentage higher DS contents than other
established mechanical dewatering technologies. The research was financially
supported by the Swiss Commission for Technology and Innovation (CTI).
For detail information see the final report [pdf file, 1,6 MB], only in German
Publication [pdf file, 588 KB]