Fig. 1. The map showing the special water preservation area and buffer zone of Lake Paldang watershed(☆ Monitoring station, P2).
Fig. 2. The variation of water quality in Lake Paldang from 1990 to 2017.
Fig. 3. The variation of pollutant source in special water preservation area of Lake Paldang watershed from 1990 to 2016 (P, SF, I, IWF, L, LWF, S&WF and TF denotes population, sewage flow rate generated by population, industrial facilities, wastewater flow rate generated by industrial facilities, livestock, wastewater flow rate generated by livestock, sewage and wastewater total generation flow rate and total discharge flow rate in sewage & wastewater treatment plants, respectively).
Fig. 4. Comparison of pollutant source in special water preservation area and buffer zone of Lake Paldang watershed from 1999 to 2016.
Fig. 5. The variation of discharge load in special water preservation area of Lake Paldang watershed from 2010 to 2015.
Fig. 6. The variation of the emission standard and discharge concentration of public sewage treatment plants (≥ 500 m3/day) in special water preservation area of Lake Paldang watershed from 1990 to 2016.
Fig. 7. The variation of water quality in Lake Paldang, and discharge flow rate & load of public sewage treatment plants in special water preservation area of Lake Paldang watershed from 1990 to 2016.
Fig. 8. Comparison of water quality in Lake Paldang during classified three period based on the time when the BOD and TP emission standard of public sewage treatment plants was changed. a, b, A and B indicates significant difference during classified three period.
Fig. 9. Comparison of STP discharged Load, and the ratio of public sewage treatment plants discharged Load to incoming delivery load from Buckhan and Namhan river.
Table 1. Designation status in Special Water Preservation Area and buffer zone of Lake Paldang watershed (2016)
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