AWWA WKICO66069

Biological nitrification in groundwater filters is often inhibited by iron removal processes inthe same filters. Nitrification can be successfully maintained in full-scale filters by use ofsubsurface aeration, which probably changes the iron removal mechanism and theresulting filter coatings. Several groundwater filters, with and without subsurface aeration,have been compared for mass and pore structure of the coatings on the filter materials.Cumulative pore area of filter coatings in drinking water filters has been determined bymercury-intrusion porosimetry. The results have been related to biological nitrifyingactivity in a standard batch test. In the non-subsurface aerated filter samples, both massand cumulative pore area were restricted and inversely proportional to specific nitrificationrate. In subsurface aerated filters, however, a strong increase in coating mass resulted inhigh cumulative pore area, but only a slight reduction in specific nitrification rate. Includes 9 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2008

Number of Pages:

13

File Size:

1 file , 520 KB