Special Research On The Removal Pollutant By Ozonation And BAC Filtration

Systematical research was done acording to the raw water quality of Huangpu River from the mechanism and performance to remove polutant in this article. The experiment-studied the removal efficiency of pollutants, the oxidation characteristic of ozone, and the characteristic of biological activated carbon filtering bed.The research on ozonation technology showed that ozonation can decrease effectively organic pollutant burden and improve biodegradability of water. The study on operational performance of BAC filter showed that biodegradable organic matters were mainly removed by metabolism.Effluent water quality of three treatment process which include"pretreatment process","pretreatment process + ozonation + BAC"and"pretreatment process + air+BAC"was dicussed, experimental results showed both of two advanced treatment process could improve water quality of pretreatment process. The process of"ozone + BAC"could averagely reduce about 31% of CODMn annually, and about 21% for the process of"air + BAC". For CODMn the former has a higher removal than the latter by about 10% and for UV254 by about 20%.The security of effluent water quality for both two advanced treatment process was assessed and results showed that the process of"ozone+BAC"has a better performance no matter the biostability or bacteria population for effluent. GC/MS test showed that total organic species number was reduced 59.7% and total spectrum aera was reduced 33% after treatment by"pretreatment+ozone+BAC+chlorination", on the other hand, total organic species number was reduced 44% and total spectrum aera was reduced 13% after treatment by"pretreatment+air+BAC+chlorination". All these demonstrated that the process"ozone + BAC"could produce higher quality of water than that of"air + BAC".It does a further research and explration on the efficience of the removing of the organic pollutants from water. The result of the experimental study shows that it is an effective deep treatment method to strengthen and improve the tranditional water purification process with the use of ozone-biological activated carbon purification technology for water deeply polluted by organic contaminants. Based on the analysis of kinetics, a kinetic eqution was proposed to charatierize the relation between BDOC and ozone, and a eqution charatierized BDOC removel in the BAC filter.The result of the study of the intermediate-scale experiment proves the possibility of the use of the ozone-biological activated carbon deep parification technology for actual engineering.