Study On Removal Process Of Polluntant From Source Water Of Taihu Lake

Putrefactive product of algae, lakebed mud and its own pollution are the main factors of Taihu's water crisis in 2007. UF membrane method can be used to determine Molecular weight(MW) distribution of the pollutants. The experiment investigated the treatment of source water when used the technologies, such as coagulation,ultrafiltration,ozonation,activated carbon adsorption and combined process. Meanwhile, in order to investigate the removal efficiencies of different processes, the water which contain putrefactive product of algae,Lakebed mud and source water was treated respectively. The experimental results showed that:1.The majority of organic substances in putrefactive product of algae have MWs lower than 3kD. The organics with low MW will be the final product. The odorous compounds have MWs higher than 3kD. The ozonation process can effective remove odorous compounds.It is effective in removal the pollutants with increase of O3 dose and contact time. The activated carbon adsorption is effective in removal of organic substances with lower MWs. There is good complementary relationship between ozonation and avtivated carbon adsorption in removal of organic with different MW, They can effectively play their respective characteristics.2. The results showed that majority of organic substances in lakebed mud have MWs higher than 10kD. The coagulation process can effectively remove organic substances with higher than 10kD and have a certain extent effect in removal of odorous compounds ,The pollutants can be removed effectively with the increase of PAC dose. Coagulation/Ultrafiltration and PAC on-line coagulation/Ultrafiltration have the same removal effect at the same dose. Results showed that the pollution on the membrane surface counld be effectively reduced by adding coagulant, pollutant on membrane surface could be effectively cleaned up by regular water cleaning.3. Taihu Lake have lots of organic substances,high turbidity and serious odor which varied with the quality. But the combined process showed effective in removal of pollutants and can protect water quality. The algae detected in the water near complete be removed , which indicates that the integrate process can surly be applied into the emergency water treatment.