Ettlingen, April 1999
Where several qualities of waters of
differing hardness are being mixed together the lime/carbon dioxide-balance
will be disturbed. Owing to the resultant free, aggressive, carbon dioxide the
lime scale layers protecting the pipelines against corrosion will be dissolved,
thus the pipelines will be attacked. This problem occurs wherever cities or
communities add external water, for example, groundwater or surface water, to
waters from their own springs or deep wells in order to meet the drinking water
demand.
Corresponding mixed water facilities must therefore incorporate
the means to neutralise the hard water in order to obtain a mixed water without
this free, aggressive, carbon dioxide.
GEA Jet Pumps offers an
extremely environmentally conscious process for this neutralisation by means of
water jet air injectors. By drawing in ambient air, degress of neutralisation
up to 65 % can be achieved which is sufficient for most applications. The
operation of this jet pump especially developed for the purpose requires a
water pressure of only 0.8 bar. A range with 17 sizes covering water rates from
1 to 300 m³/h is available. Owing to their small space requirement, the jet
pumps can usually be installed without the necessity of expensive
modifications. Operation is extremely simple and special maintenance is not
required.
Depending on their size, the jet pumps can be supplied in
rubber-lined cast iron or PVC/GRP material.
The illustration shows water jet air injectors for the neutralisation of
water, installed in the water supply station in Mockritz, Germany.