The plan of running the liquid residues of acetylene
manufacture into any local sewerage system which may be found in the
neighbourhood of the consumer's premises, therefore, is very convenient
to the consumer; but is liable to produce complaints if the sewage is
afterwards treated chemically, or if its effluent is passed untreated
into a highly preserved river; and the same remark applies in a lesser
degree if the residues are run into a private cesspool the liquid
contents of which automatically flow away into a stream. If, however, the
cesspool empties itself of liquid matter by filtration or percolation
through earth, there can be no objection to using it to hold the lime
sludge, except in so far as it will require more frequent emptying. On
the whole, perhaps the best method of disposing of these residues is to
run them into some open pit, allowing the liquid to disappear by
evaporation and percolation, finally burying the solid in some spot where
it will be out of the way. When a large carbide-to-water generator is
worked systematically so as to avoid more loss of acetylene by solution
in the excess of liquid than is absolutely necessary, the liquid residues
coming from it will be collected in some ventilated closed tank where
they can settle quietly.
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