In industrial field, a large volume of regenerants (acid and caustic soda) and
zuIak;A. Kumar, their washing effluents are regularly disposed off from the water demineralization
plant during regeneration of the ion-exchanger units. Of these waste effluents, a
part of the wash water discharged from the single bed Anion and Mixed Bed units
bic Effect; Jhon can be utilized at a certain stage of their washing cycles when its conducti~ it} is
fallen down and becomes considerably less than that of the input raw water. The
main aim of this specific: waste effluent utilization is to dilute the TDS
concentration of the input raw water (fed into the single bed ion-exchan.-er units)
by blending. The achievement is the increase.of the longevity of the production
cycles of the I.E. units along with the improvement of the production quality and
decrease of the regeneration frequencies. As ;a result, regererant consumption
would be saved because of the reduction of ionic Ioad in fee i water which will
ultimately reduce the water purification cost. At the same tine, the environment
pollution will also be protected to a considerable extent. This operational measure
- - is quite effective and useful specially where high TDS water is dernmeralizcd only
by single bed ion--exchangers. In such case, the water treatment plant is vcry often
found to suffer from both production quality and quantity in addition to c.ur) ill,-,
out of random and restless regenerations. Proper reuses of the aforesaid Nvash Nk atcf
effluents of the Anion and ´MB units--excellently minimizes the difficulties
experienced in practice. This paper contains the utilities and techniques of reuses
of the different kinds of waste effluents of the industrial water treatment plant in
addition to the specific reuses of the post-regeneration wash waters of the Anion
and MB ion-exchanger units.
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