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KMID : 0353019750120020373
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Korean Journal of Public Health
1975 Volume.12 No. 2 p.373 ~ p.383
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A Study on the BOD Loading Produced in the Jungrang Stream Basin and the Dilution in the Han River
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Abstract
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For an estimation of quantitative biochemical oxygen demand (B.O.D) loading to the Jungrang stream, the number of the residents and the amount of industrial products by manufacture items are investigated in the drainage of the stream.
The amount of estimated B.O.D. were compared with the calculated value based on the tested B.O.D. concentration and the measured flow rate. Analysing the dilution of B.O.D. loading and flow rate, the B.O.D. concentrations in 1981 at the confluence of the Han River and the Jungrang stream after treating waste are presented.
The major results of this survey are summarized as follows:
1) The estimated B.O.D. loading almost coincides with the measured B.O.D. loading.
2) The ratio of industrial B.O.D. loading to domestic B.O.D. loading is estimated at two to three.
3) The amount of industrial discharge produced by thirty-one plants having over 100 ton/day of was te-water is found to occupy 86 per cent of total amount of industrial waste.
4) The master plan of the Jungrang Sewage Treatment plant has been set at the capacity of 280,000㎥/day. However, the total waste in 1981 is estimated to be 492,870㎥/day which exceeds the designed capacity of treatment.
5) It is necessary that B.O.D?? concentration at the downstream site of the Jungrang Stream be limited at less than 14ppm level in order to preserve 3ppm of B.O.D. in the Han River as a water quality standard.
6) When operating the Chunge Sewage Treatment plant with the effluent of 19ppm and the Jungrang Sewage Treatment plant with that of 20ppm of B.O.D??, concentration of 1.62ppm level at the upstream site of the confluence of the Han River is estimated to be 3.37ppm at the confluence while B.O.D?? concentration of 2.30ppm at the upstream site of the confluence of the Han River is estimated to be at 3.98ppm level at the confluence through dilution.
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