A Pilot Scale Study Of Activated Carbron And Membrance For Removing Natural Organic Carbon

There are many challenges in drinking water treatment, and one of them isthe removal of natural organic matter(NOM). NOM is recognized to be achemistry that causes many adverse effects in water treatment. As a solidadsorption and filtration technology with low energy consumption andzero-chemicals, Activated carbon adsorption+membrane filtration method hasunique advantages for the removal of natural organic matter in water. Thissubject systematically studies the efficiency that a set of activated carbonadsorption and membrane filtration pilot plant which can treat2.4t water perhour removing the natural organic matter in drinking water. In the wholeexperiment process, we used ultrafiltration grading methods, considered theremoval efficiency of carbon filtration, ultrafiltration and nano-filtration processon various molecular weight range of organic compounds, and studied the rule inthe process of technology for removing disinfection by-products formingpotential. Engineering and technical scheme of the reservoir water depthtreatment is given in this dissertation.This paper explores the influence of filtering rate at different value of7m/h,5m/h and3m/h on the effluent turbidity and potassium permanganate index. Bylong term detection of conventional water-quality index(pH, DO, Turbidity,Electrical Conductivity, potassium permanganate index, etc.), the removalefficiency of experimental facility for treating drinking water was studied. Theresults showed that the turbidity removal rate of high turbidity water was higherthan that of low turbidity water which treated by filter chamber. The pH ofactivated carbon process effluent was higher than that of influent. In thebeginning period of activated carbon absorption, the removal rate of potassiumpermanganate index was higher than57%.80hours latter, the removal rate wasonly40%. The removal rate of potassium permanganate index by ultra-filtrationwas low.Through the measurement of ultra-filtration grading, three-dimensionalExcitation-Emission Matrix fluorescence spectroscopy(3DEEM) and disinfectionby-products forming potential, it concluded the law of drinking water treatmentby the experimental facility. The results showed that activated carbon had aoptimum removal efficiency for organic substance with the relative molecularweight of1～3KDa. The relative molecular weight of organic substances is lowin the effluent of ultra-filtration. The organic substances in the effluent of nano-filtration had been eliminated almost. And the removal of giant moleculeorganic substances of nano-filtration was nearly100%. According to the3DEEMof activated carbon effluent at each season, it found that the content of naturalorganic substances varied greatly. Carbon filtration showed that removal rate oftrihalomethane forming potential was lower than removal rate of HAAs formingpotential. Ultra-filtration process on removing trihalomethane formationpotential is better than the removal of HAAs forming potential. Nano-filtrationprocess on trihalomethane forming potential and HAAs forming potentialremoval rates were81.05%,58.17%, effectively protecting the water quality andbiological stability of drinking water safety.The carbon filtration was convenient and cheap both in designing andoperation, which was proper for the improvement of old water treatment plant.The out-flow was fit for the latest rule for drinking water (GB5749-2006).Activated carbon adsorption+membrane filtration method was morecomplicated than carbon filtration, and it was more expensive, too. It can be usedin the new water treatment plant which need the high-quality water.