科研之友
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摘要
Constructed rapid infiltration system (CRIS) belongs to the plug-flow reactor. Some scholars think that owing to the inhibition on the nitrifying bacteria from organics, along the direction of the water flow in the plug-flow reactor, organics is removed firstly and then is NH(4)(+)-N. A CRIS analog column was applied to treat the domestic wastewater and the degradation laws of COD and NH(4)(+)-N under different hydraulic loads was studied. The results show that in conditions of five different hydraulic loads, the COD removal rates in 0-0.75 m section of CRIS are high and the best filter layer for the COD degradation is 0-0.25 m section. After 0.75m, the COD removal rates become lower and lower with the increase of the filter layer depth. In 0-0.25 m section, since the organic nitrogen is transformed into NH(4)(+)-N via action of the heterotrophic bacteria and the ammonifying bacteria, the NH(4)(+)-N concentrations rise slightly. After 0.25 m, the NH(4)(+)-N removal rates increase rapidly and the best filter layer for removing NH(4)(+)-N tends to shift down with the rise of hydraulic load. Though the best filter layer for NH(4)(+)-N degradation and the best filter layer for COD degradation are different, the filter layer for NH(4)(+)-N degradation and the filter layer for COD degradation have no strict area boundary.
