Prodn. of pumpable sludge, less dense than water - with controlled viscosity and gamma irradiated, for use as fertilizer

摘要

Homogenised, settled sludge is treated with gamma radiation to reduce its microbiological count. It is further settled into water and a sludge phase which floats. At least part of floating phase is mixed with at least part of the water to give a (pumpable) mixt. with a desired viscosity which may be used as fertiliser.