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K leather industry wastewater treatment plant(advanced treatment process) was selected to evaluate effluent quality and pollutants removal efficiencies. BOD5 concentration of effluent was 3.95㎎/ℓ and its removal efficiency was 99.8%. Also, most of other pollutants removal efficiencies were over 90% as well. And 95% reliability of effluent concentration were 106.8㎎/ℓ of CODmn, 86㎎/ℓ of SS, 72.04㎎/ℓ of TN, greater than the effluent limitation(60㎎/ℓ), 0.98㎎/ℓ of ABS, 1.8㎎/ℓ of n-Hexane, 9.7㎎/ℓ of BOD5 and 0.11㎎/ℓ of Cr.
This study was carried out to grope for Water Quality Index (WQI) which is able to use as a practical method evaluating water quality concerned with degree of pollution. 8 variables for determining the pollution were selected such as pH, DOs, Water temperature (WT), BOD, SS, TC, NH₃-N and NO₃-N and the results are summarized as follow. 1. Each WQI value was calculated by exponential equations (graph) described below. At the range. of pH 3.0 to 6.8, Y=10^((0.08394 x pH + 0.74921)) and pH 8.5 to 11.7, Y=10^((-0.21843 x pH + 3.85664)) At the range of DOs 30 to 100%, Y=10^((0.00999 x DOs + 1.00147 )) and DOs 100 to 130%, Y= 10^((-0.02330 x DOs +4.32990)) At the range of WT 28 to 34℃, Y=10^((-0.11650 x WT + 5.26186)) At the range of BOD 0.8 to 10.0 ㎎/ℓ, Y=10^((-0.075975 x BOD + 2.06078)) At the range of SS 2.6 to 37 ㎎/ℓ, Y=l0^((-0.018891 x SS + 2.056673)) At the range of TC 50 to 200,000 MPN/100㎖, Y=10^((-0.19416 x log TC + 2.33007)) At the range of NH₃-N+NO₃-N 0.4 to 3.4㎎/ℓ, Y=10^((-0.23299 x (NH₃-N + NO₃-N) + 2.09320)), Where Y is index value of each water quality. 2. The weights of each variable were 0.04 for pH and WT, 0.11 for DOs, 0.18 for TC, 0.21 for BOD, SS and NH₃-N+NO₃-N, respectively.
To investigate bioassay for toxic level evaluation of wastewater, toxic levels were checked influents and effluents of 6 wastewater discharge facilities with Daphnia magna and Vibrio fischeri. In view of test duration, D. magna is preferred at 48 hours. And it was judged to efficient that one of the two was choosen for toxicity test method (Daphnia test and Vibrio test). Analysis data for wastewater is average toxic level for influent more higher than effluent. And effluent toxic level is sharp decrease than effluents.
The distribution pattern of water quality parameters and phytoplankton biomass in upper inflow rivers of lake Paldang had surveyed. In North-Han river system, nutrient concentrations and algal biomass was below the standard of mesoand oligotrophy from lake Soyang to lake Paldang, maintaining good water quality, except the N5 site located near the Chuncheon-Si, showing high nutrients concentrations and algal biomass. The algal biomass of the South-Han river system showed oligotrophic level in the upstream near the lake Chungju, and increased along the flow direction showing eutrophic level in the downstream within the lake Paldang area. On the other hand, the highest concentrations of nutrients were detected in the middle stream near the Yeoju-Si and Yangpyung-Gun rather than in the downstream suggesting algal biomass in lake Paldang would not come from the upper river area but come from the growth within the lake area using nutrients from the upper inflow river.