SURVEYING THE CURRENT STATUS AND PROPOSING MEASURES TO TREAT HEAVY METAL POLLUTED WATER OF NAM SAN BAY LAKE, DANANG CITY

Abstract

This paper presents the results of the survey of the discharge of sources around Hoa Tho Dong Ward into Nam San Bay lake. Through the result analysis from water and sediment samples, we propose a number of measures to improve water quality of the lake. The first model is water hyacinth combination of activated carbon (applied to treat polluted water with low concentration of heavy metals in the lakes); the second model is the adsorption model combined with flotation method (applied to treat polluted water with high concentration of heavy metals). In the first model, the results show that adsorption capacity of heavy metals (Pb) onto activated carbon is quite high. In the second model, the results of water treatment by activated carbon and flotation system show that Pb concentration decreases significantly (over 80%), Cd (85%) compared with untreated polluted water.