HRP(high rate pond) which had kept the manufactured clay of 3㎝-thickness as benthic clay in reactor and the 6 flat-blade turbine as impeller for agitation was named HRASP(high rate algae stabilization pond). And the experiment for treatment of artificial synthesis wastewater containing COD : 300㎎/ℓ. , NH3-N : 30㎎/ℓ, T-P : 9㎎/ℓ. as nutrients was been performed successfully. This reactor was been operated under conditions : 24 hrs.-irradiation and water temperature, 25℃ and pH 7 and agitation velocity, 15, 30, 45rpm and the effect of agitation velocity on algal bioaccumulation of nutrients was been studied with view point of fluid dynamics.
The next followings could be obtained as results.
1. The agitation with a turbine impeller blade in HRASP makes clay particle indicate superior suspension effect by means of forming of excellent curl/shear flow in reactor.
2. The excessive suspension of clay particle which is created at 45rpm as rotation velocity of impeller blade of turbine disturbs the light penetration and algal photosynthesis reaction.
3. Efficiencies for removal of nutrients come out as COD : 93.9%∼94.3%, (NH3-N + NO3-N) : 81.9%-99.0%, T-P : 46.8%-53.6%.
4. Kuo values of K1 for algal growth come out seperately as 15rpm : 1.876×10-2, 30rpm : 4.618×10-3.
5. Kuo values of K2 for removal of N, P come out seperately as 15rpm : 8.403×10-1 and 1.397×10-1, 30rpm : 4.823×10-1 and 2.052×10-1.
6. It can be guessed easily that the excessive agitation can inhibit the algal and bacterial symbiotic reaction if it is considered that micro organism' sense to preservation of life is relied on natural function of metabolism. Therefore the studies for this matter should be followed continuously.

• 공석기(중부대학교 환경공학과) | Surk Key Kong