Hidrológiai Közlöny 1971 (51. évfolyam)

1. szám - Abos Bruno: A talajvízdúsítás vízminőségi problémái

30 Hidrológiai Közlöny 1971. 1. sz. Special Conference Number, Szebellédy, L. ed to improve the physical, chemical, biological and bacteriological properties of water. Moreover it is called upon to remove to organic, decomposable substances remaining in water after pretreatment. The information available so far is believed to be sufficient to permit the establishment of the method to be applied for the slow filtering of waters intended for treatment, the specification of design criteria and the method of operation to be observed. The problems calling for further research appear to emerge clearly from the papers. For the correct application of slow filtration and for attaining the necessary higli efficiency the solution of these problems is essential. The problems are of a complex character. For research to be successful it is believed essential to investigate further the ways in which new advances can be applied in the practice of technological realization. The practical utilization of scientific results is often impeded by the lack of a technological solution. Subsequently I shallattempt to summarize the problemes, in which a solution is desired. 1. The determination of a theory suitable for describing the hydraulie process of slow filtration, including the factors of physical, chemical, biological and bacteriological processes. 2. The experimentál determination of limit values for groups of polluting substances, which do not affect the quality of filtered water in the case of slow filtration. 3. The development of economical methods of pretreatment suitable for the removal of specific pollutants, or groups of pullutants from surface water. 4. Hydraulie studies into groundwater recharging, with the aim of improving the efficiency of recovering filtered water. 5. The influenee of the pH of pretreated water applied for recharging, on slow filtration and on the quality of filtered water. 6. Research aimed at eliminating the carbondioxide aggressivity of slow-filtered and recharged water. 7. Studies on the magnitude and relative position of infiitration and production areas in groundwater recharging. 8. Development of measures suitable for preventing the prolification of organisms present in filtration water in the case of groundwater recharging from basins. 9. The development of mechanical methods of low labour demand for the regeneration of slowfilter surfaces. 10. The influenee of climatic and meteorological factors on groundwater recharging from basins. 11. Development of uniform methods of preliminary hydrobiological studies. 12. The improvement of high iron-manganese waters with recharged surface water. In conclusion thanks are due to the authors of the papers submitted for the help they offered by the valuable information. Without this assistance this generál report would have been incomplete. I have attempted to evaluate this information in the light of my personal experience, to make this report more relevant. Thanks are alsó due to the organising committee for having assigned me the responsibility of compihng the generál report on slow-filtration and groundwater recharging, and for having offered the opportunity for dealing with this highly contemporary method of water purification.