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http://dx.doi.org/10.15681/KSWE.2015.31.4.418

Development of Optimal Septic Tank in the Countries of Water Shortages  

Lim, Bong-Su (Department of Environmental Engineering, Daejeon university)
Jing, Hai-Long (Department of Environmental Engineering, Daejeon university)
Publication Information
Journal of Korean Society on Water Environment / v.31, no.4, 2015 , pp. 418-427 More about this Journal
Abstract
This study was carried out to evaluate the performance of a lab-scale novel septic tank system for improving the conventional septic tank in the developing countries of water shortages. The lab-scale novel septic tank system consists of sepetic tank, aeration tank with HBC-ring, and sand filter. Optimum HRT was reguired about 1.5days to get a total COD removal efficiency of 90%, COD, BOD and SS removal efficiency was about 70%, 60%, and 85% in sepetic tank only. The structure of sepetic tank with two stages results in the high removal efficiency of organic matter. When sepetic tank, aeration tank, and sand filter were more than HRT 1.5days, 18hrs, and 12hrs, respectively, final effluent was less than 20 mg/L of BOD, 14 mg/L of SS, so that there is a high potential of its use for reusing water in flush toilet. There is no significant effect of HRT change on nutrient removal. Total nitrogen removal efficiency was about 40%, final effluent was 30~40 mg/L of TN, total phosphorus removal efficiency was about 11~25%, final effluent was 9~12 mg/L of TP. Because there is very small amounts of organic nitrogen and phosphorus in effluent, it was possible to reuse water for agricultural use.
Keywords
Developing Countries of Water Shortages; Optimum HRT; Reusing Water in Flush Toilet; Septic Tank System;
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