The Research On The Application Of Powered Activated Carbon In The Treatment Of Micro-pollutant Source Water

The water sources of most cities have been polluted to some extent. The convential wate treatment process don't work very well to this kind of water, the effluent of which have lots of THMs that may cause cancer.The powered activated carbon(PAC) was welcomed by most water sciticists for its flexible application,particularly to the water changing much duo to the season.The authour investigate the dosing conditions and effect of the PAC to the Huanghe water-source, which includes the following four parts: the selection of the PAC; the confirmation of dosing scheme and effect of the PAC; the research of application of potassium permanganate in combination with PAC;the research of the PAC's modification and the modified effectiveness.The experiment is mainly carried out on the pilot system in the Jieyuan water plan of Tianjin.The results of the reseach include the following: l)The PAC from Zunhua plant is selected as the better carbon for the source water of Tianjin through the experiment;2)Through the pilot experiment we conclude that the PAC's best adding point is the mixing tank and the better dose is 10mg/L,on which the CODMn of filtered water can be decreased to 40% and the effluent have no problem of odour and color; 3The adsorbing experiment show that PAC mainly adsorb the organic matters which molecular wt.,distribution between 500 and 3000,and can adsorb organic matters whose molecular wt.,distribution are bigger than 6000 if the dose ofit is adequent; 4)PAC together with potassium permanganate can remove the organic matter more effectively than each of them alone,and reduce the rising trend of turbidity of the flotation's effluent due to adding PAC; 5) The thesis made a research on the surface properties and the adsorbing capability of the modified carbon by oxidizer: the modified carbon with 20% H2O2 can remove more organic pollutants than the untreated one by 12% when we add a higher dose of coagulant;6)The modification of reduction and loading metal ions are also Sttldied,and drow the following conclusions:the modified carbon with 5% ammonia can enhance the organic matter's removal effectiveness by 10% to the Tianjin source water than the untreated one,and the modified one with loading metal ion remove the organic matters from the Tianjin source water better (8%) than the untreated one due to the strong affinity betwween the humic acid and copper ion.PAC pre-treatment technology prove to be an economical, convinent and efficient technology for micro-pollutant water source, and it can.be used with other pre-treatment technologies.In the nowdays' enconomic condition,the PAC technology has a promising prospect of application.