Purification of Songhua River water with an integrated O₃ /AC-GAC process

GUAN Chun-yu¹, MA Jun¹, LIU Gui-fang¹, SUI Ming-hao²

1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.School of Environmental Science and Engineering,Tongji University,Shanghai 200331,China



Abstract:

Catalytic ozonation with coal-based activated carbon (carbozone) followed by GAC ( granular activated carbon) filtration was compared with ozone-GAC process for water purification. Songhua River water pretreated with traditional processes was used as influent in the continuous-flow experiments. The carbozone-GAC process performed better than the ozone-GAC process during the 9. 5-months operation period. The organic removal rate in carbozone was found to be very high in the initial operation period,and then gradually decreased to a steady level. At the steady state of operation,the average removal rates of permanganate index ( PI) and UV254 were 25. 8% and 67. 8% in carbozone,and 6. 6% and 53. 7% in ozonation alone,respectively. The carbozone process also achieved a higher DOC removal than ozonation alone,and moreover,the number of semi-volatile organic compounds detected with GC/MS decreased from 44 to 28 in carbozone and 34 in ozonation alone,respectively. The catalyst surface became more acidic during the long-term operation with its pHPZC( pH at which its surface is zero charged) decreased from 7. 0 to 6. 2. In addition,the physical characteristics of the catalyst were also changed during the operation.

Key words:  activated carbon  catalytic ozonation  GAC  organic matter

DOI：10.11916/j.issn.1005-9113.2010.04.023

Clc Number:X52

Fund: