Basic Study of Groundwater Recharge which Aim at Preservation of Water Resources : (Study of Bio-Filter)

Abstract

An experimental Study has been made on the effect of bio-filter in a packed bed. By using a packed bed of glass beads in stead of aquifer, groundwater recharge was reappeared. Measurements were made on microorganism number density, COD, turbidity, iron concentration, and pH. Emphasis was placed on the removal effect of COD. The conclusions were as follows. 1) Bio filter is formed at the upstream end of the packed bed. It is composed of general microorganism and iron bacteria. The number densities of microorganism and iron bacteria are increased with the passage of time and io-filter is thickly formed. 2) Bio-filter is very useful to COD removal, because organism is consumed by oxidation with iron bacteria and iron. 3) Iron is removed by the physical filter effect of bio-filter and oxidation with iron bacteria. 4) Turbidity is removed by the physical filter effect of bio filter. 5) Light is an effective system for COD removal. 6) Environmental temperature is usefulness to bio-filter formation and water purification.