This study was conducted to evaluate the growth dynamics and nutrient removal by filamentous periphytic algae (FPA), occurring as dominant species in polluted streams and rivers. The experiment was carried out in the artificial channels with nutrient-rich treated wastewater, coupled with the laborat...
This study was conducted to evaluate the growth dynamics and nutrient removal by filamentous periphytic algae (FPA), occurring as dominant species in polluted streams and rivers. The experiment was carried out in the artificial channels with nutrient-rich treated wastewater, coupled with the laboratory cultivation under different phosphorus concentrations. Water velocity and different types of substrate were manipulated in the experiment. The highest growth rate of FPA was observed at the water velocity of 10cm/s; the most suitable substrata for FPA growth were apparently the natural fiber net and wire net when evaluated at in-lab circulation water way and at pilot waterway in situ, respectively. When used the wire net in the pilot waterway system which was manipulatied in water velocity, the highest average growth rate of FPA was observed in 10cm/s, regardless of the mesh size. In the substrata test, 20mm mesh net was the most suitable material for FPA growth in both winter and spring season, showing the highest biomass of 14.1 gDW/㎡ with the average growth rate of 1.20 gDW/㎡/day (November) and 179.0 gDW/㎡ and 20.18 gDW/㎡/day (March), respectivley. On the other hand, the highest biomass and the average biomass was observed on the natural fiber net during laboratory experiment with 1.27 gDW/㎡. Up to the phosphorus concentration of 0.35mg/ℓ, FPA biomass development and the increasing nutrient input showed correlated increases. Nutrient removal by FPA was evident in all the parameters (e.g., TP, NO3, NO2, NH4, TP, SRP, SS, COD, and BOD). The most effective nutrient uptake was observed at the water velocity of 0.5cm/s ~ 5cm/s. Although nutrient uptake rate varied with the type of nutrient, removal rate was higher in the water flowing at 1cm/s and 5cm/s than at 0.5cm/s. In the aspect of substrata, 20mm mesh iron net was proven to be more effective than the natural fiber net in situ condition due to the closing of mesh by algae and other material. In the laboratory experiment, P removal rate increased with P concentration in inflow water. However, no correlation was shown between the P input and the P removal rate in field experiment. At low nutrient loads, the removal rate increased as the nutrient load increase, but at high nutrient loads, the nutrient removal rate fluctuated except for SRP.
This study was conducted to evaluate the growth dynamics and nutrient removal by filamentous periphytic algae (FPA), occurring as dominant species in polluted streams and rivers. The experiment was carried out in the artificial channels with nutrient-rich treated wastewater, coupled with the laboratory cultivation under different phosphorus concentrations. Water velocity and different types of substrate were manipulated in the experiment. The highest growth rate of FPA was observed at the water velocity of 10cm/s; the most suitable substrata for FPA growth were apparently the natural fiber net and wire net when evaluated at in-lab circulation water way and at pilot waterway in situ, respectively. When used the wire net in the pilot waterway system which was manipulatied in water velocity, the highest average growth rate of FPA was observed in 10cm/s, regardless of the mesh size. In the substrata test, 20mm mesh net was the most suitable material for FPA growth in both winter and spring season, showing the highest biomass of 14.1 gDW/㎡ with the average growth rate of 1.20 gDW/㎡/day (November) and 179.0 gDW/㎡ and 20.18 gDW/㎡/day (March), respectivley. On the other hand, the highest biomass and the average biomass was observed on the natural fiber net during laboratory experiment with 1.27 gDW/㎡. Up to the phosphorus concentration of 0.35mg/ℓ, FPA biomass development and the increasing nutrient input showed correlated increases. Nutrient removal by FPA was evident in all the parameters (e.g., TP, NO3, NO2, NH4, TP, SRP, SS, COD, and BOD). The most effective nutrient uptake was observed at the water velocity of 0.5cm/s ~ 5cm/s. Although nutrient uptake rate varied with the type of nutrient, removal rate was higher in the water flowing at 1cm/s and 5cm/s than at 0.5cm/s. In the aspect of substrata, 20mm mesh iron net was proven to be more effective than the natural fiber net in situ condition due to the closing of mesh by algae and other material. In the laboratory experiment, P removal rate increased with P concentration in inflow water. However, no correlation was shown between the P input and the P removal rate in field experiment. At low nutrient loads, the removal rate increased as the nutrient load increase, but at high nutrient loads, the nutrient removal rate fluctuated except for SRP.
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