도시하수의 영양염류 원단위 산정 및 제어방안에 관한 연구 = A study on primary unit calculation and control devices for nutrient salts in urban sewage

다국어 초록 (Multilingual Abstract)

Inorganic matters like nitrogen, phosphorus, and etc in sewage are not only essential nutrients which consist cells of every living thing but also important materials which control productivity in soil. Though as good as the productivity is high is soil, the excessive productivity in water system is undesirable because it may cause eutrophication.
In this study, various factors which influence on the outbreak of nutrient salts are investigated, and a research on control devices for nutrient salts in domestic sewage is performed after load capacity calculation of them in "T" city which is one of many metropolitan cities. The results are as follows:
1. Night soil capacity of a person per day in our country is estimated 1ℓ, and the concern about purification treatment of nutrient salts especially like nitrogen and phosphorus is on first step but the former is 7,600㎎/capita·day, and the latter 1,500㎎/capita·day.
2. The load capacities of T-N and T-P in domestic sewage of "T" city are predicted as 10.3g/capita·day and 1.4g/capita·day in 2001, 12.3g/capita·day and 1.7g/capita·day in 2006, and 18.5g/capita·day and 2.5g/capita·day in the target year 2016, respectively. Therefore, it is thought that the high purification treatment for these nutrient salts is necessary to reuse the treated water of sewage and to maintain Keumho river and Nakdong river system steadily in future.
3. The priority management for suburban areas and dairy farmhouses which are lacking in laying sewer intercepting pipelines under ground is required as the aspect of nutrient salts control.
4. The removal rates of nitrogen and phosphorus are about 10∼30% and about 30% respectively by existing active sludge method in case of "S" treatment field which locates in "T" city, therefore additional control facilities are required, and Phostrip method, P/L method, SBR method, and A2/O method can be utilized.