A residue which is not
conspicuously saturated with water must be taken out of the generator-
house into the open air and there flooded with water, being left in some
uncovered receptacle for a sufficient time to ensure all the acetylene
being given off. A residue which is liquid enough to flow should be run
directly from the draw-off cock of the generator through a closed pipe to
the outside; where, if it does not discharge into an open conduit, the
waste-pipe must be trapped, and a ventilating shaft provided so that no
gas can blow back into the generator-house.
DISPOSAL OF RESIDUES.--These residues have now to be disposed of. In some
circumstances they can be put to a useful purpose, as will be explained
in Chapter XII.; otherwise, and always perhaps on the small scale--
certainly always if the generator overheats the gas and yields tar among
the spent lime--they must be thrown into a convenient place. It should be
remembered that although methods of precipitating sewage by adding lime,
or lime water, to it have frequently been used, they have not proved
satisfactory, partly because the sludge so obtained is peculiarly
objectionable in odour, and partly because an excess of lime yields an
effluent containing dissolved lime, which among other disadvantages is
harmful to fish.
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