| Title |
Polishing of the Secondary Effluent by High-rate Algal Pond System Coupled with Constructed Wetland |
| Authors |
김영철 ( Kim Yeong Cheol ) ; 강민기 ( Kang Min Gi ) ; 이진우 ( Lee Jin U ) |
| Keywords |
High-rate algal ponds; Constructed wetland; Nutrients; Secondary effluent; 고속산화지; 인공습지; 영양소; 2차 처리수 |
| Abstract |
In order to Polish nutrients in the effluent from small Sewage treatment plant mostly designed for targeting organic matters, aquatic treatment system coupled the non-mixed high-rate algal ponds(HRAPs) with constructed wetland(CW) were developed. The treatment studies show that its performance based on median concentration of the final elfluent was TN 2.0㎎/L. TP 0.3㎎/L, and COD 22㎎/L. respectively, and also, it was fairly stable. However, overall performance for nitrogen was highly affected by water temperature and plant density of the CW. At the operational period of lower temperature. as the performance of HRAPs was lowered inherently due to less sunlight. then CW`s contribution started to increase, so that this system functioned in a cooperative manner. At the CW most of the nitrogen was removed by nitrification-denitrification occurred in locally Aerobic/Anoxic Zone between cattails. Phosphorus balance indicates that at Ihe HRAPs most of the P was thought to be reduced through chemical precipitation at the high PH while at the CW₁ the P reduction was due to the plant uptake. The amount of plant biomass production(wet basis) was 1.4㎏ per one square meters of CW from one cubic meters of secondary effluent. |