抄録
A set of nutrients (T-N and T-P) removal equations for anaerobic-anoxic-oxic process has been proposed for municipal wastewater treatment plant designs. The equations were composed with some parameters, such as biomass concentration (X), BOD volumetric loading (LL), nitrifier recycling rates (R) and hydraulic detention time (T). The proposed equations were evaluated by data acquired at some laboratory and full scall plant tests.
Laboratory tests using 6 set of 30-litre sequencing batch reactor with nitrifier storage tank each have been carried out dosing artificial wastewater. Three cases of substrate loads supplied and four cases of R have been applied at the tests.
The data of full scale plant tests were acquired in Arakawa basin-wide (Saitama) and Toba (Kyoto) wastewater treatement plants. T-N and T-P concentrations in wastewater was ranges 10 to 25mg·1-1 and ranges 1 to 5mg·1-1 respectively. R applied were from 1.1 to 1.3.
The calculated T-N and T-P were fairly comformed to the data acquired by laboratory tests, except R=1 and 1.4 data which were varied widely. Calculated T-N and T-P were lower than 15 to 25% and 10 to 20% respectively, compared to the full scale-plant data.
