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윤춘경 ( Yoon Chun Gyeong ),권순국 ( Kwun Sun Kook ),김형중 ( Kim Hyung Joong ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.4
Constructed wetland system which can be applied to the rural wastewater treatment system was examined by pilot plant in Kon-Kuk University. Hydraulic loading rate of wastewater was about 0.16m<sup>3</sup>/m<sup>2</sup> · day and theoretical detention time in the system was 1.38 days. The effluent of the septic tank for the school building was applied as inflow to the system. The influent concentration of DO was zero but effluent was up to 4.37mg/ℓ, which implies that oxygen was supplied enough from atmosphere by reaeration to support biological activity of the system. Average influent concentration of BOD was 104mg/ℓ and effluent was 24mg/ℓ with average removal rate of 76%. Average influent concentration of COD was 215mg/ℓ and effluent was 63mg/ℓ with average removal rate of 70%. Average influent concentration of SS was 78mg/ℓ and effluent was 10mg/ℓ with average removal rate of 87%. Two components, BOD and SS, are regulated by law to keep maximum water quality standard of 80mg/ℓ when daily outflow rate is less than 100m<sup>3</sup>/day which is the case of most rural communities. Therefore, the results from the experiment showed that constructed wetland system can meet the water quality standard easily. Average influent concentration of total nitrogen was 165mg/ℓ which is relatively higher than normal wastewater, and effluent was about 156mg/ℓ with average removal rate of only 5%. Average influent concentration of total phosphorus was 41mg/ℓ and effluent was 6mg/ℓ with average removal rate of 87%. Overall, constructed wetland system was thought to be effective to treat wastewater if nitrogen removal mechanism is improved. Considering low cost, less maintenance, and high treatability, this system can be a practical alternative for the wastewater treatment in rural area. The Experiment was performed during the summer and fall season, and treat ment efficiency of the system is expected to decrease in low temperature. Therefore, further study including temperature is required to evaluate feasibility of the system more in detail.
오수처리수의 관개가 벼 생육 및 토양 특성에 미치는 효과
윤춘경 ( Yoon Chun Gyeong ),권순국 ( Kwun Soon Kook ),우선호 ( Woo Sun Ho ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.3
Effect of reclaimed sewage on the paddy rice culture was examined by field experiment for two consecutive years. The domestic sewage was treated by the constructed wetland, and the effluent of the treatment wetland was used for irrigation water. The reclaimed sewage was diluted before irrigation in the first year, and it was used without dilution in the second year experiment. Growth components and yields were compared against the control plot where conventional method was applied. And also, soil characteristics of the plots before and after reclaimed sewage irrigation were analyzed. Generally, addition of the reclaimed sewage irrigation didn't affect paddy rice culture adversely and even enhancement was observed. Fertilization was thought to be important factor for rice culture rather than irrigation water quality. Conventional fertilization and reclaimed sewage irrigation which contained high nutrient concentration resulted in better growth and more yield. Unlike widespread concern lodging did not happen even in the case of irrigation with average 90mg/L of T-N and conventional fertilization. Soil characteristics changed after irrigation and significant EC increasing was observed for the reclaimed sewage irrigation plots. From soil analyses, salt accumulation could be a more potential problem than nutrients like nitrogen and phosphorus in the use of reclaimed sewage irrigation. Overall, reclaimed sewage irrigation was thought to be one of practical alternatives for the ultimate disposal of sewage in rural area.