The present investigation was undertaken to assess the water quality of thePleasant Valley Lake, Jubilee hillswhich is a man-made lake originally designed for drinking water purposes. But the lake was disappeared from past few years due to dumped garbage, domestic sewage and the release of industrial effluents. In recent years, the lake was being cleaned with an eco-friendly hydroponic floating treatment wetland technique. This study was conducted to examine the efficiency of floating treatment wetland in improving the water quality of the pleasant valley lake. The water samples were collected before (on 2nd February 2020 at 8:00AM) and every 15 days (17th feb 2020, 7th March 2020, 22nd March 2020) after the installation of FTW and analyzed for the Physico-chemical quality, microbiological data and heavy metal concentration with the use of standard analytical techniques for water quality and the results were compared with the prescribed acceptable limits for drinking water. Of the different water quality parameters, the results showed that the pH, TS, TSS, TDS, BOD, alkalinity and Total hardness are within the prescribed limits while COD and DO are above and below the standard limits respectively. Microbiological analysis revealed that 80% of the strains were gram negative and most of the bacterial strains belong to class proteobacter, water is not suitable for human consumption. The heavy metal concentrations indicated the presence of Cu, Cd, Zn and Ni. The average concentration of metals in treated water is less than that of the untreated water. The comparison of heavy metals in the pleasant valley lake with the drinking water standards and those in water used for agriculture suggests that the mean concentration of Cu and Zn lies within the standard where-as Cd and Ni are above the standards. The results indicated that floating treatment wetlands are effective in improving the water quality of the lake.
