Hidrológiai Közlöny 1971 (51. évfolyam)

1. szám - Varró István: Felszíni vizek tisztításának korszerű módszerei és anyagai

Special Conference Number, Szebellédy, L. Hidrológiai Közlöny 1971. 1. sz. 47 for modifying flow and for improved efficiency. Further development may be expected here. Contact filtration is expected to gain in significance, but for the time being difficulties are encountered in preventing short-circuiting between raw and treated water. Automatic feed will be introduced for ozone, or potassium permanganate to oxidize organic pollutants (e. g. phenole) present in water. The activated carbon used in adsorption processes (e. g. where oil is present in the water) renders treatment rather expensive. Granulated carbon tends to loose somé of its efficiency during operation. Advancement is anticipated in thermal regeneration, which may create more permanent conditions. Instead of the powdered form a more practical use of activated carbon may be anticipated. In conclusion it is noted that unless the water resources are carefully protected from becoming polluted, no clean water will remain available for canned drinking water. * As will be perceived, 24 of the 26 papers submitted and reviewed briefly here deal with problems related to the treatment of surface waters. It should be noted alsó that the subjects listed have by no means exhausted the possibilities for the treatment of surface waters. Reference is made here e. g. to the application of natural and artificial slow filters (to which a separate generál report will be devoted during this conference). The present generál report has been confined to the subjects mentioned in the papers submitted and no other process has been included. As reflected by the papers, serious efforts are made both in Hungary and abroad and extensive research is under way. It is to be hoped that as a result of these the technology of surface water treatment will be improved considerablv in the near future. The most urgent problems requiring rapid solution for improving water treatment are believed to be as follows: 1. The development and application of coagulants and flocculants, enabling the attainment of 100 percent efficiency in settling and filtration. 2. The development of a filtration method, where the filtration velocity is several times as high as it is presently. 3. Improvement of clarifier design to reduce, or eliminate completely the formation of stagnation areas and to create possibly undisturbed flow conditions. 4. Development of stable plastic, or other materials for substituting activated carbon, which are easy to recover and more economical to use. 5. Reduction of the costs of investment and operation of ozone generating equipment. 6. Further automation of the operation of water treatment plants. The reporter is fully aware of the fact that considerable time is bound to elapse before these suggestions can be realized. However, in view of the development rate witnessed during the past few years this may still be expected in the not too distant future. In conclusion thanks are due to the authors of the papers submitted, in the firm belief than they succeeded in contributing to the solution of an important problem, namely than of producing more drinking water of good quality. Moreover, I should be permitted to express my anticipation for futher meetings to discuss the attendant questions of world-wide interest and to report on results and achievements attained by then.