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A Study on the Improvement of Treatment Efficiency for Nitrogen and Phosphorus by Improved Sewage Treatment Process in Constructed Wetland by Natural Purification Method
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 Title & Authors
A Study on the Improvement of Treatment Efficiency for Nitrogen and Phosphorus by Improved Sewage Treatment Process in Constructed Wetland by Natural Purification Method
Seo, Dong-Cheol; Park, Woo-Young; Lim, Jong-Sir; Park, Chan-Hoon; Lee, Hong-Jae; Kim, Hong-Chul; Lee, Sang-Won; Lee, Do-Jin; Cho, Ju-Sik; Heo, Jong-Soo;
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 Abstract
To effectively treat the domestic sewage that was produced on a small-scale in farming and fishing village in order to encourage an ecologically friendly environment, a small-scale sewage treatment apparatus using natural purification methods that consisted of an aerobic and an anaerobic plots were constructed. The efficiency of sewage treatment according to the sewage loading was investigated to obtain the optimum sewage loading in small-scale sewage treatment apparatus. Removal rate of pollutants according to the sewage loading were in the order of >. Therefore, the optimum sewage loading was 300 L m-2 day-1. Under the optimum sewage loading, removal rate of BOD, , turbidity, T-N and T-P were 99, 94, 99, 49 and 89%, respectively. However, to satisfy the water quality standard in effluent in small-sclae sewage treatment apparatus for domestic sewage treatment, the low removal efficiency of T-N and T-P must be improved. So to improve the removal rate of T-N and T-P, the efficiency of sewage treatment according to the improved sewage treatment process such as, re-treatment at aerobic plot, anaerobic condition of aerobic plot, changing the filter media sizes and the depths in anaerobic plot, and also addition of oyster shells to filter media at anaerobic plot were investigated. In case of 150 cm depth in anaerobic plot with filter medium A (effectivity particle size 1.50 mm) and addition of oyster shells to filter media at anaerobic plot, removal rate of T-N and T-P in both plots were increased by 10 and 3%, and 14 and 7% in comparison with 100 cm depth in anaerobic plot with filter medium B(effectivity particle size 0.95 mm), respectively. The optimum improved sewage treatment process in small-scale sewage treatment apparatus were 150 cm depth in anaerobic plot with filter medium A and addition of oyster shells to filter media at anaerobic plot.
 Keywords
constructed wetland;sewage treatment;oyster shell;T-N;T-P;anaerobic plot;aerobic plot;
 Language
Korean
 Cited by
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